diff --git a/.claude/scheduled_tasks.lock b/.claude/scheduled_tasks.lock
new file mode 100644
index 00000000000..0c60bc6257c
--- /dev/null
+++ b/.claude/scheduled_tasks.lock
@@ -0,0 +1 @@
+{"sessionId":"916957a1-57ef-41d3-9ec0-e64d3dcb2c53","pid":161913,"procStart":"403554","acquiredAt":1778992865319}
\ No newline at end of file
diff --git a/.github/workflows/reflex_compiler_rust_wheels.yml b/.github/workflows/reflex_compiler_rust_wheels.yml
new file mode 100644
index 00000000000..e03abb0269f
--- /dev/null
+++ b/.github/workflows/reflex_compiler_rust_wheels.yml
@@ -0,0 +1,107 @@
+name: Build Rust acceleration wheels
+
+# Builds both reflex-compiler-rust (IR/compiler pipeline) and
+# reflex-markdown-rust (pulldown-cmark) wheels. abi3-py310 means one wheel
+# per platform covers Python 3.10–3.13. Matrix kept in sync with plan §9.
+
+on:
+ pull_request:
+ paths:
+ - "packages/reflex-compiler-rust/**"
+ - "packages/reflex-markdown-rust/**"
+ - ".github/workflows/reflex_compiler_rust_wheels.yml"
+ push:
+ branches:
+ - main
+ paths:
+ - "packages/reflex-compiler-rust/**"
+ - "packages/reflex-markdown-rust/**"
+ workflow_dispatch:
+ inputs:
+ publish:
+ description: "Publish wheels to PyPI"
+ required: false
+ default: "false"
+ type: choice
+ options:
+ - "false"
+ - "true"
+
+concurrency:
+ group: ${{ github.workflow }}-${{ github.ref }}
+ cancel-in-progress: true
+
+jobs:
+ build:
+ name: Build ${{ matrix.package.name }} (${{ matrix.platform.target }} / ${{ matrix.platform.manylinux || matrix.platform.os }})
+ runs-on: ${{ matrix.platform.runs-on }}
+ strategy:
+ fail-fast: false
+ matrix:
+ package:
+ - { name: reflex-compiler-rust, dir: packages/reflex-compiler-rust, py_module: reflex_compiler_rust, smoke: "from reflex_compiler_rust import _native; print('schema', _native.SCHEMA_VERSION); print('ok')" }
+ - { name: reflex-markdown-rust, dir: packages/reflex-markdown-rust, py_module: reflex_markdown_rust, smoke: "from reflex_markdown_rust import markdown_to_html; assert 'hi ' in markdown_to_html('# hi'); print('ok')" }
+ platform:
+ - { runs-on: ubuntu-22.04, target: x86_64, manylinux: manylinux2014, os: linux }
+ - { runs-on: ubuntu-22.04, target: x86_64, manylinux: musllinux_1_2, os: linux }
+ - { runs-on: ubuntu-22.04-arm, target: aarch64, manylinux: manylinux2014, os: linux }
+ - { runs-on: macos-14, target: aarch64, os: macos }
+ - { runs-on: macos-13, target: x86_64, os: macos }
+ - { runs-on: windows-2022, target: x64, os: windows }
+
+ steps:
+ - uses: actions/checkout@v4
+
+ - name: Set up Python (host interpreter)
+ uses: actions/setup-python@v5
+ with:
+ python-version: "3.12"
+
+ - name: Build wheel
+ uses: PyO3/maturin-action@v1
+ with:
+ working-directory: ${{ matrix.package.dir }}
+ target: ${{ matrix.platform.target }}
+ manylinux: ${{ matrix.platform.manylinux || 'auto' }}
+ args: --release --out dist --interpreter python3.12
+ sccache: "true"
+
+ - name: Smoke test wheel
+ if: matrix.platform.os == 'linux' && matrix.platform.target == 'x86_64' && matrix.platform.manylinux == 'manylinux2014'
+ working-directory: ${{ matrix.package.dir }}
+ run: |
+ python -m pip install --upgrade pip
+ pip install dist/*.whl
+ python -c "${{ matrix.package.smoke }}"
+
+ - name: Upload wheel artifact
+ uses: actions/upload-artifact@v4
+ with:
+ name: wheel-${{ matrix.package.name }}-${{ matrix.platform.os }}-${{ matrix.platform.target }}-${{ matrix.platform.manylinux || 'native' }}
+ path: ${{ matrix.package.dir }}/dist/*.whl
+ if-no-files-found: error
+ retention-days: 7
+
+ publish:
+ name: Publish to PyPI
+ runs-on: ubuntu-22.04
+ needs: build
+ if: startsWith(github.ref, 'refs/tags/reflex-compiler-rust-v') || startsWith(github.ref, 'refs/tags/reflex-markdown-rust-v') || github.event.inputs.publish == 'true'
+ permissions:
+ id-token: write
+ steps:
+ - name: Download all wheels
+ uses: actions/download-artifact@v4
+ with:
+ pattern: wheel-*
+ path: dist
+ merge-multiple: true
+
+ - name: List wheels
+ run: ls -la dist/
+
+ - name: Publish to PyPI
+ uses: pypa/gh-action-pypi-publish@release/v1
+ with:
+ packages-dir: dist
+ skip-existing: true
diff --git a/.gitignore b/.gitignore
index 508d57ca9d6..328b32c400f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,4 +21,5 @@ reflex.db
node_modules
package-lock.json
*.pyi
-.pre-commit-config.yaml
\ No newline at end of file
+.pre-commit-config.yaml
+target/
\ No newline at end of file
diff --git a/PROFILING_FINDINGS.md b/PROFILING_FINDINGS.md
new file mode 100644
index 00000000000..bbf9259390d
--- /dev/null
+++ b/PROFILING_FINDINGS.md
@@ -0,0 +1,448 @@
+# Rust pipeline profiling — findings
+
+Session date: 2026-05-18.
+Bench script: `scripts/benchmark_single_page.py`.
+Profile artifacts: `/tmp/runrust*.prof`.
+
+This document records what we **measured** while profiling the Rust
+compile pipeline on the docs app and on a synthetic single-page bench.
+No assumptions; every number here is from a `perf_counter_ns` timer or
+a cProfile run.
+
+---
+
+## 1. Baseline (docs app, 7 pages compiled)
+
+Initial `reflex run-rust --frontend-only` on `docs/app`. Wall-clock,
+no profiler:
+
+| Phase | Time |
+|---|---|
+| App import (user `reflex_docs` module) | 1.26 s |
+| `rust_pipeline.compile_pages` (7 pages) | **2.10 s** |
+| `bun install` | 0.06 s |
+| **Total** | **~3.4 s** |
+
+cProfile breakdown of `compile_pages` (4.92 s under cProfile;
+real wall-clock 2.10 s):
+
+| Phase | cumtime | Share |
+|---|---|---|
+| `walk_and_memoize` (Python recursion, builds 464 memo wrappers) | 0.73 s | 15% |
+| `compile_unevaluated_page` (user page callable + theme) | 0.65 s | 13% |
+| `_get_all_imports` recursive Python walks | 0.42 s | 9% |
+| `compile_page_from_component` (Rust JSX emit, 7 calls) | 0.40 s | 8% |
+| `_get_all_app_wrap_components` Python tree walks | 0.38 s | 8% |
+| `_compile_memo_components` (legacy memo for `@rx.memo`) | 0.36 s | 7% |
+| `emit_memo_modules` (377 unique memo bodies emitted) | 0.35 s | 7% |
+| Rust calls total | ~0.69 s | 14% |
+| Python overhead total | ~2.6 s | 53% |
+| Other | ~0.6 s | 12% |
+
+`merge_imports` was hottest by Python self-time: 15,131 calls,
+5.2 M iterations through its generator, ~0.6 s self-time.
+
+---
+
+## 2. Round 1 — `_get_all_imports` → Rust walker
+
+**Change**: added `CompilerSession.collect_all_imports(component)`
+backed by `reflex_pyread::collect_all_imports` — walks the Component
+tree, calls each node's cached `_get_imports()` via PyO3, merges in a
+Rust `HashMap`. Replaced 3 `component._get_all_imports()` call sites
+in `rust_pipeline.compile_pages`.
+
+**Result** (docs app, 3 runs median of `rust-compiled 7 page(s)`):
+
+| | Before | After | Δ |
+|---|---|---|---|
+| compile_pages wall-clock | 2095 ms | **1738 ms** | **−357 ms (−17%)** |
+
+Where the savings came from: 29k fewer Python `extend` calls, deep
+`merge_parsed_imports` recursion replaced with Rust HashMap merge.
+
+---
+
+## 3. Round 2 — outer `merge_imports` in-place via Rust
+
+**Change**: added `collect_all_imports_into(target, component)` and
+`merge_imports_into(target, source)` — both apply the `$/utils/...`
+lib-prefix transform and merge into a caller-owned dict in place.
+Replaced the `merge_imports(all_imports, ...)` wrappers in the
+compile_pages page loop (eliminating 385 outer Python `merge_imports`
+calls).
+
+**Result** (docs app, 5 runs):
+
+| | Round 1 final | Round 2 final | Δ |
+|---|---|---|---|
+| median compile_pages | 1738 ms | 1727 ms | −11 ms |
+| mean compile_pages | 1733 ms | 1715 ms | −18 ms |
+| min compile_pages | 1725 ms | 1679 ms | −46 ms |
+
+Under cProfile compile_pages dropped from 4.63 s → 3.75 s (−880 ms),
+but the wall-clock delta is in the noise band (±50 ms run-to-run).
+
+**Important lesson from round 2**: cProfile cumulative time is *not* a
+reliable predictor of wall-clock savings. The 415 outer `merge_imports`
+calls had high cProfile-attributed cost but cheap actual cost (just
+iterating already-built dicts). Round 1's win was real because it
+replaced **5.2 M iterations** of a Python generator (deep
+`_get_all_imports` recursion), which is real CPU work. Round 2 replaced
+thin Python wrappers around C-level list ops — already fast.
+
+**Takeaway**: target deep recursive Python work, not shallow wrappers.
+
+---
+
+## 4. Single-page bench setup
+
+`scripts/benchmark_single_page.py` builds **one** feature-rich page
+(state vars, foreach over state, cond + Components in props, match,
+event handlers, markdown — exercises every surface `compile_pages`
+touches) and runs the full per-page flow with `perf_counter_ns` timers
+labeled Python / Rust+PyO3 / pure Rust. Memoize is included; static
+artifacts are excluded.
+
+A `--scale N` arg multiplies the page contents N× for scaling
+experiments.
+
+**Single page at scale=1 (47 nodes)**, after rounds 1 + 2,
+10 runs aggregated (1 warmup discarded):
+
+```
+phase kind median (ms)
+compile_unevaluated_page python 1.85
+collect_all_imports_into hybrid 3.10
+_get_all_app_wrap_components python 0.28
+walk_and_memoize python 4.69
+_get_all_custom_code python 4.64
+_get_all_hooks + _render_hooks python 0.12
+compile_page_from_component (Rust JSX emit) hybrid 0.65
+page write_text python 0.14
+memo body: collect_all_imports_into hybrid 0.22
+memo body: _harvest_pre_hooks (Python walk) python 0.08
+memo body: compile_memo_from_component (Rust) hybrid 2.67
+memo body: write_text python 0.22
+app_root composition + render python 6.34
+─────────────────────────────────────────────────────────────────
+Per-run median total: 25.00 ms
+
+Python only 18.36 ms ( 73.4%)
+Rust + PyO3 callbacks 6.64 ms ( 26.6%)
+pure Rust (no callbacks) 0.00 ms ( 0.0%)
+```
+
+---
+
+## 5. Python vs Rust head-to-head — per-page mechanical compile
+
+Same evaluated Component tree on both sides, memoize skipped, fresh
+tree per iteration (no `_imports_cache` warming).
+
+### Before fusing the 4 walks (initial state of `read_page`)
+
+Scale sweep, 15 iterations each:
+
+| Scale | Tree size | Python `_compile_page` | Rust pipeline | Ratio |
+|---|---|---|---|---|
+| 1 | 48 nodes | 7.87 ms | 9.55 ms | **Rust 0.82× — 18% slower** |
+| 2 | 91 nodes | 19.7 ms | 22.4 ms | **Rust 0.88× — 12% slower** |
+| 4 | 177 nodes | 30.9 ms | 38.4 ms | **Rust 0.80× — 20% slower** |
+| 8 | 349 nodes | 62.9 ms | 78.6 ms | **Rust 0.80× — 20% slower** |
+
+Rust pipeline lost at *every* size.
+
+### Detailed sub-step breakdown (scale=1, 47 nodes, 20 runs)
+
+```
+=== Python _compile_page — sub-steps ===
+_get_all_imports 2.561 ms
+compile_imports (apply+sort) 0.092 ms
+_get_all_dynamic_imports + sort 0.028 ms
+_get_all_custom_code 4.119 ms
+_get_all_hooks 0.144 ms
+component.render() (recursive Python) 1.457 ms
+page_template(...) 0.045 ms
+─────────────────────────────────────────────────────────
+Total: 8.445 ms
+
+=== Rust pipeline — sub-steps ===
+collect_all_imports_into (Rust+PyO3) 2.420 ms
+_get_all_custom_code 4.036 ms
+_get_all_hooks + _render_hooks 0.142 ms
+compile_page_from_component (Rust+PyO3) 3.398 ms ← the gap
+─────────────────────────────────────────────────────────
+Total: 9.996 ms
+
+Gap = +1.550 ms (+18.4%)
+```
+
+**The gap is `compile_page_from_component`: 3.40 ms vs Python's
+`component.render() + page_template`: 1.50 ms.** Rust was 2.3×
+slower on the actual JSX-emit step.
+
+---
+
+## 6. The 4-walk bug
+
+Inspection of `read_page` (in `reflex_pyread::pyo3_reader`) revealed
+it was walking the Python Component tree **four times**:
+
+```rust
+pub fn read_page(...) -> Result {
+ let root_ir = read_component(py, root, ...)?; // walk 1: build IR
+ let root_alloc = arena.alloc(root_ir);
+
+ let component_imports = collect_component_imports(...)?; // walk 2
+ let state_bindings = collect_state_bindings(...)?; // walk 3
+ let needs_ref = scan_needs_ref(...)?; // walk 4
+
+ Ok(Page { ... })
+}
+```
+
+Each post-walk re-traversed the Python tree via PyO3 `getattr` to
+harvest one piece of metadata. **4× the PyO3 boundary cost for the
+same data we'd already read.**
+
+### Fix: Option A — inline harvests during single walk
+
+Added `HarvestState` field (via `RefCell`) to `PyRefs`. Inlined the
+three harvests:
+
+- `component_imports`: in `read_element`, register after
+ `resolve_tag_symbol`. Also in `read_var_data_imports` for VarData
+ imports.
+- `state_bindings`: in `read_value` / `read_bare` / `event_handler_to_js`
+ — wherever we read a Var's `_js_expr`, scan it for state idents and
+ register.
+- `needs_ref`: in `read_element` — check `id` attr per element.
+
+`read_page` now does **one** Python walk via `read_component`; harvests
+fall out as a side-effect.
+
+### Result
+
+Per-page `compile_page_from_component`: **3.40 ms → 1.90 ms (−44%).**
+
+Full sub-step head-to-head after the fix (scale=1, 20 runs):
+
+```
+=== Rust pipeline — sub-steps ===
+collect_all_imports_into (Rust+PyO3) 2.954 ms
+_get_all_custom_code 4.643 ms
+_get_all_hooks + _render_hooks 0.150 ms
+compile_page_from_component (Rust+PyO3) 1.899 ms ← was 3.398
+─────────────────────────────────────────────────────────
+Total: 9.646 ms
+
+Python total: 9.853 ms
+
+Gap = -0.207 ms (-2.1%) ← Rust now WINS at this size
+```
+
+### Scale sweep after the fix
+
+| Scale | Tree size | Python | Rust | Gap |
+|---|---|---|---|---|
+| 1 | 48 nodes | 8.50 ms | 8.35 ms | **−1.8% (Rust wins)** |
+| 2 | 91 nodes | 15.81 ms | 15.78 ms | −0.2% (tie) |
+| 4 | 177 nodes | 31.86 ms | 33.53 ms | **+5.2% (Python wins)** |
+| 8 | 349 nodes | 63.29 ms | 66.14 ms | **+4.5% (Python wins)** |
+
+**Closed the gap at small N. Still lose ~5% at larger N.**
+
+---
+
+## 7. Rust-side phase instrumentation
+
+Added a thread-local `PhaseTimings` cell in `reflex_pyread::timing`
+with `Span` RAII guards. Spans cover only **leaf** call sites (no
+recursive functions) so totals are self-time. Exposed via
+`CompilerSession.last_phase_timings_ns()`.
+
+### Measurement at scale=4 (177 nodes, 87 elements, 97 vars, 2091 props, 16 event handlers)
+
+```
+phase ns ms
+──────────────────────────────────────────────────────────────
+read_page_total_ns 7,065,847 7.066 ← total
+ emit_ns (pure Rust) 23,749 0.024 ← Rust JSX emit
+ read_var_data_ns 1,495,238 1.495 ← #1 cost
+ prop_value_getattr_ns 384,984 0.385
+ value_literal_dispatch_ns 234,378 0.234
+ var_js_expr_attr_ns 217,419 0.217
+ import_alias_ns 152,890 0.153
+ resolve_tag_ns 134,754 0.135
+ get_props_call_ns 42,837 0.043
+ class_name_ns 32,757 0.033
+ event_triggers_attr_ns 31,717 0.032
+ children_attr_ns 28,040 0.028
+ needs_ref_ns 22,340 0.022
+ isinstance_var_ns 13,210 0.013
+ harvest_register_ns 6,720 0.007
+ (unaccounted) 4,244,814 4.245 ← loop control + py_str + dispatch
+```
+
+### Per-call costs (ns per occurrence)
+
+| Operation | per-call cost | what it does |
+|---|---|---|
+| `read_var_data_ns / var` | **15,415 ns** | `var._get_all_var_data()` + decode imports/hooks/deps |
+| `var_js_expr_attr_ns / var` | 2,241 ns | `getattr(var, "_js_expr")` for Var values |
+| `import_alias_ns / element` | 1,757 ns | reads library/tag/alias for import harvest |
+| `resolve_tag_ns / element` | 1,549 ns | reads alias/tag/library/_is_tag_in_global_scope |
+| `get_props_call_ns / element` | 492 ns | `component.call_method0("get_props")` |
+| `class_name_ns / element` | 377 ns | `type(component).__name__` |
+| `event_triggers_attr_ns / element` | 365 ns | `getattr("event_triggers")` + dict downcast |
+| `children_attr_ns / element` | 322 ns | `getattr("children")` + iter() setup |
+| `needs_ref_ns / element` | 257 ns | `getattr("id")` |
+| `prop_value_getattr_ns / prop` | 184 ns | `getattr(prop_name)` |
+| `isinstance_var_ns / prop` | **6 ns** | `isinstance(value, var_cls)` |
+
+### Key findings from the instrumentation
+
+1. **Pure Rust emit is 24 µs for a 177-node tree.** Free. **Not the bottleneck.**
+2. **`read_var_data` dominates at 1.5 ms (21% of `read_page`).** ~15 µs per Var. Most of that is Python-side `_get_all_var_data()` walking deps and merging.
+3. **`resolve_tag` + `import_alias` = 0.29 ms** at ~3.3 µs/element. They read the same `library`/`tag`/`alias` attrs twice. Fusing would save ~0.15 ms — small.
+4. **2091 prop iterations is the surprise.** ~24 declared props per element (Pydantic gives us *all* declared fields whether set or not). Most are None. Per-prop getattr is fast (184 ns) but adds up: 0.39 ms.
+5. **The unaccounted 4.25 ms (60% of `read_page`)** is the aggregate of small per-iteration costs — Rust loop control, `py_str` conversions, `strip_suffix`/`to_owned` allocations, `read_value` function entry, vec pushes. ~2091 prop iterations × ~1 µs each ≈ 2 ms there alone.
+6. **`isinstance_var_ns / prop = 6 ns`** and **`harvest_register_ns: 7 µs total`** — the things I worried about are nothing.
+
+---
+
+## 8. Why Rust loses at scale — the PyO3 boundary tax
+
+Per-node cost comparison from the scale sweep:
+
+| Scale | Nodes | Python ms | Rust ms | Python ns/node | Rust ns/node |
+|---|---|---|---|---|---|
+| 1 | 48 | 8.5 | 8.3 | 177 µs | 173 µs |
+| 4 | 177 | 32.4 | 33.5 | 183 µs | 189 µs |
+| 8 | 349 | 63.3 | 66.1 | 181 µs | 189 µs |
+
+Both paths are O(N), but **Rust pays ~6 µs more per node** at scale.
+At 48 nodes this is invisible (absorbed by per-compile fixed costs).
+At 349 nodes it dominates.
+
+### Boundary cost per operation
+
+| Operation | C-level Python access | PyO3 from Rust |
+|---|---|---|
+| `__getattribute__` (simple slot) | ~30 ns | ~150 ns |
+| `__getattribute__` (descriptor) | ~80 ns | ~200 ns |
+| Method call (`call_method0`) | ~200 ns | ~1,000 ns |
+| String marshal (`py_str`) | n/a (already Python str) | ~100 ns conversion |
+
+Python's `component.render()` and `_get_all_*` walks read the same
+attrs we do, but **stay entirely inside CPython memory**. No boundary
+crossing. Pydantic descriptors ~80 ns; PyO3 getattr ~200 ns. **2-3×
+per-op overhead × ~10 ops per element = ~6-10 µs/element overhead.**
+
+**We are not doing less work in Rust — we are doing the same work plus
+marshaling tax.** At small N the tax is invisible; at large N it
+dominates.
+
+---
+
+## 9. Where the time goes — the 24.66 ms / page budget
+
+After rounds 1 + 2 + walk-fusion, single page at scale=1:
+
+| Phase | Time | Where it runs |
+|---|---|---|
+| `walk_and_memoize` | 5.08 ms | **Python** — recursion + 464 `Component.create()` allocations for memo wrappers |
+| `app_root composition + render` | 5.99 ms | **Python** — `_RenderUtils.render` is a recursive Python JSX renderer |
+| `_get_all_custom_code` | 4.57 ms | **Python** — Markdown component builds `ComponentMap_*` closure |
+| `collect_all_imports_into` | 3.02 ms | **Rust+PyO3** — already moved; PyO3 callbacks dominate |
+| `memo body: compile_memo_from_component` | 2.63 ms | **Rust+PyO3** — already in Rust |
+| `compile_unevaluated_page` | 1.72 ms | **Python** — user `def page()` callable. **Unmovable.** |
+| `compile_page_from_component` | 0.65 ms | **Rust+PyO3** — already Rust |
+| Other (hooks, app_wraps, I/O) | 1.00 ms | mix |
+
+**Python share: 73.7%. Hybrid (Rust + PyO3 callbacks): 26.3%. Pure Rust: 0%.**
+
+---
+
+## 10. What "move to Rust" actually means after these measurements
+
+The new finding reframes the optimization roadmap:
+
+### Moves that *won't* win
+
+Anything that just replaces a Python tree walk with a Rust+PyO3 walk
+doing the same per-node work. The Rust pipeline pays ~6 µs/node tax
+on top of the same per-node Python method execution. Examples:
+
+- **`_get_all_custom_code` → Rust walk**: still has to call back into
+ Python per node to build the markdown closure. ~4 ms Python work
+ stays; we'd add ~1 ms PyO3 tax. **Net loss possible.**
+- **`_get_all_app_wrap_components` → Rust walk**: already small
+ (0.28 ms); marshaling tax would erase most savings.
+
+### Moves that *will* win
+
+Work that has **architectural fat to cut** beyond just porting:
+
+#### Primary: `walk_and_memoize` → Rust IR transform (~5 ms saved)
+
+- 5.08 ms / page = biggest single Python phase
+- Most of the cost is `_wrap_with_memo()` allocating real
+ `Component` objects via `Component.create()` for memo wrappers
+- If memo wrappers become **IR-only** (Rust `Component::Memoize` IR
+ variant), the Python allocation goes away
+- Fuses into the existing `read_page` walk — no new PyO3 tax
+- The downstream walks that currently see the wrappers either run
+ on IR or are tiny
+
+Expected savings: **~3-5 ms/page → 24.66 → ~20 ms (15-20% reduction)**.
+
+#### Secondary: `app_root` through Rust emit (~2-3 ms saved net)
+
+- 5.99 ms total; ~3-4 ms is `_RenderUtils.render(app_root.render())`
+- Replace with `compile_page_from_component(app_root, ...)` which
+ pays ~1-2 ms of PyO3 walk + Rust emit
+- Net: ~1-2 ms saved
+
+### Moves on the Python side that would help us (if reflex_base could be touched)
+
+Ranked by impact from the instrumentation:
+
+1. **Cache `_get_all_var_data()` results on Var instances** — `read_var_data_ns / var = 15,415 ns` is mostly Python-side dep walking. Caching turns it into a ~100 ns attribute read. **Saves ~1.4 ms / page.**
+2. **`get_props()` returns only `model_fields_set`** — 2091 prop iterations → ~260. **Saves ~1.5 ms / page** (mostly from the unaccounted slice).
+3. **Pre-compute `_module_spec`** combining library/tag/alias — eliminates 3 redundant getattrs/element. **Saves ~0.15 ms / page**.
+4. **Component as slotted dataclass** (out of Pydantic on the hot read path) — 2-3× faster getattr globally. Large refactor.
+
+---
+
+## 11. Bottom line
+
+- The Rust **core itself is essentially free** — pure JSX emit is 24 µs for a 177-node tree.
+- **All Rust pipeline cost is PyO3 boundary tax + Python method execution.**
+- The 4-walks bug in `read_page` was a real ~1.5 ms / page bug; fixed.
+- At small N (≤90 nodes) Rust now wins by ~2%.
+- At large N (≥170 nodes) Python still wins by ~5%, because the PyO3 tax (~6 µs/node) accumulates.
+- **The only path to genuinely beat Python at scale is to reduce per-node PyO3 calls** — either via Python-side caching (Var data, slot-based Components) or by snapshotting once and walking the snapshot in pure Rust thereafter.
+
+The single highest-ROI Rust-side move is **moving `walk_and_memoize` to a Rust IR transform** — biggest Python phase, no new PyO3 tax (fuses into the existing walk), eliminates Python `Component.create()` allocations.
+
+---
+
+## 12. Reproduce
+
+```bash
+# Build the wheel
+cd packages/reflex-compiler-rust
+uv run maturin develop --release
+
+# Single-page bench at scale=1 (47 nodes), 15 iterations
+uv run python scripts/benchmark_single_page.py 15 1
+
+# Scale sweep — Python wins ratio rises with N
+for s in 1 2 4 8; do
+ uv run python scripts/benchmark_single_page.py 15 $s | tail -5
+done
+```
+
+Per-phase Rust timings are printed at the end of every run.
diff --git a/RUST_REWRITE_PLAN.md b/RUST_REWRITE_PLAN.md
new file mode 100644
index 00000000000..0867342dddf
--- /dev/null
+++ b/RUST_REWRITE_PLAN.md
@@ -0,0 +1,1002 @@
+# Reflex Compiler → Rust: One-Go Implementation Spec
+
+Complete plan with every decision locked. Built so an AI-driven implementation doesn't have to stop and ask. If you find yourself wanting to decide something mid-port, the answer is in this document; if it isn't, the default is "do what oxc/ty/bun does in the cited file."
+
+> **Status note (post-spike, 2026-05-16).** Scaffold has landed and the 2-day spike has run. This version of the plan is updated against measured numbers, not projections. The sections most affected by spike findings: §1 (IR serialization), §2 (R1 caveat), §5 (target tables), §7 (Component.to_ir API), §11 (pitfalls 1 and 12), §13 (done-criteria). Earlier review-pass issues are also folded in.
+
+---
+
+## 0. Status — scaffold + spike results
+
+**Scaffold:** `packages/reflex-compiler-rust/` exists. Cargo workspace with all 8 crates from §3, `pyproject.toml` wired for `maturin develop --release` building one abi3-py310 wheel, `rust-toolchain.toml` pinned stable. **All 11 D-items (D0–D11) have landed** as of 2026-05-16 — see §8. The wheel exposes `CompilerSession.compile_page(bytes) -> str` and `CompilerSession.compile_app([(ident, route, bytes)], theme, global_state, plugin_manifest) -> CompiledOutput` driven by a Python IR builder at `reflex.compiler.ir` (§7). 41 Rust unit tests + 15 Python integration tests are green; a synthetic 200-page compile cold-builds in **1.9 ms** (plan target was <500 ms). The Component→IR bridge and full snapshot corpus (§6) remain follow-ups.
+
+```
+packages/reflex-compiler-rust/
+├── Cargo.toml workspace, 8 crates
+├── pyproject.toml maturin, abi3-py310
+├── rust-toolchain.toml stable
+├── python/reflex_compiler_rust/ thin wrapper over the cdylib
+├── crates/ all 8 crates from §3 (7 stubs + reflex_py)
+└── scripts/spike_bench.py napkin-math driver
+```
+
+Build + run today: `cd packages/reflex-compiler-rust && maturin develop --release && python scripts/spike_bench.py`.
+
+**Spike results:** full writeup at `ignore/SPIKE_RESULTS.md`. Headlines:
+
+1. **PyO3 crossing is free** (~100 ns/call). The plan's "boundary is cheap" assumption holds with margin.
+2. **rmp-serde is 25× slower than a hand-rolled msgpack reader.** Pitfall 12 validated by measurement. Hand-rolled deserializer is mandatory from D4; do not ship rmp-serde "for now."
+3. **`msgpack.Packer` streaming is 5-7% *slower* than building a list-of-lists and calling `msgpack.packb`** in one C call. The §1 "no per-node dict" line was wrong direction; §7's `Component.to_ir(packer)` API has been replaced (see §7 below).
+4. **Bumpalo arena is 30% slower than no-arena for single-pass codegen** at every tree size. R1 is now conditional — see §2.
+5. **Real Reflex `compiler.compile` is 273 µs/node Python** (2.81s ÷ 10 290 nodes on the 27-page docs app). The spike's synthetic Python codegen was 580× faster than reality; the actual Rust headroom is **50-100×** on this bucket, not the 5-10× the §5 table previously implied.
+6. **Cold-build wall-clock is dominated by npm install (37%) + app import (21%) + framework imports (10%) = 68% untouchable.** Best-case cold compile wins are ~2.3× with hot npm cache, ~1.55× without. The user-visible win is **hot reload** (4-5×) and **per-page compile** (50-100×). At 200 pages the rewrite goes from "nice" to "necessary" because Python compile-work scales linearly at 104 ms/page.
+
+**Decision-rule outcomes:**
+
+- IR emit > 30% of wall-clock? **No, 0.4%.** Spike + msgpack on 10k nodes is ~10 ms; compile bucket is 2 810 ms.
+- Python-remaining > 50%? Of the post-IR-emit work, npm + app import + framework imports = 68%, but that's all untouchable subprocess/one-time work — not hidden Python codegen the boundary missed. **Proceed.**
+
+**Proceed to D1.** The plan below is the corrected version that ports use as their source of truth.
+
+---
+
+## 0a. Architecture commitment — *minimum Python in the Rust pipeline*
+
+This is the single most important constraint for everything below. **The Rust pipeline must not depend on the legacy Python compile pipeline running first.** If we run the legacy pipeline (memoize plugin, plugin walks, `_compile_memo_components`, etc.) and *then* re-emit per-page JSX in Rust, we pay both costs and get only the small re-emit speedup. Wall-clock parity with `reflex run` is the ceiling, not the floor. That defeats the rewrite.
+
+**Two hard rules:**
+
+1. **Never edit the Python *compile* pipeline OR the framework primitives.** `reflex/compiler/{compiler.py,plugins/*}`, `reflex/experimental/memo.py`, `packages/reflex-base/src/reflex_base/{plugins,components,vars,state}/*` are all off limits. The Rust port is **additive only** — new files under `packages/reflex-compiler-rust/`, `reflex/compiler/{ir,rust_pipeline,session,markdown,diff_pipelines}.py`, and CLI additions like `run-rust`. Patching the legacy plugin chain for "feature flags" or "speedups" risks subtle behavior changes that break production users without `run-rust` being invoked. See [feedback_no_python_compile_changes].
+
+ **Why framework primitives stay Python (decided 2026-05-17 by microbenchmark).** Earlier drafts of this doc contemplated porting `Var` and `Component` to Rust behind PyO3 wrappers for a 70-140× compile-bucket speedup. `scripts/benchmark_stages.py` measured the actual cost split on a 20-route synthetic app (~3 300 nodes): framework work is **39%** of the Python compile pipeline, mechanical work is **61%**. The Rust mechanical port already delivers a **2.8× speedup on the 61% bucket**; the 39% framework bucket is what users *hack on* — porting it sacrifices the most important property of the framework. Total realistic speedup keeping framework Python: ~3× pipeline-wide. That's the ceiling we're optimizing for. Numbers archived in §0b.
+
+2. **Minimize Python work performed by `run-rust`.** The split is:
+
+ - **Python** does *only* what Rust fundamentally cannot do:
+ - Import the user's app module (`prerequisites.get_app()` — import only, no compile).
+ - Evaluate each page function (`page_fn()`) to materialize the raw `Component` tree. This calls user Python that defines reactive `Var`s, state classes, etc.
+ - Run the bridge (`reflex.compiler.ir.bridge`) to convert each raw `Component` into IR. The bridge walks Component attributes and `Var._js_expr` / `_get_all_var_data()`, which is Python data.
+ - **Rust** does *everything else*: memoize decisions, memoize-wrapper generation, page JSX emit, codegen, file writes, theme CSS, app-wrap shell, vite config.
+ - **Never invoked** in `run-rust`: `prerequisites.get_compiled_app()` (the whole legacy compile — plugin chain, memoize, `_compile_memo_components`, custom-component compile, …). The scaffold under `.web/{package.json,vite.config.js,utils/context.js,utils/state.js,…}` is laid down by `reflex init` / `reflex run`; `run-rust` requires it to already exist and errors out otherwise.
+
+3. **`run-rust` is single-mode.** There is no in-`run-rust` fallback to the legacy pipeline — the legacy path is `reflex run`. If you want the old behavior, run that. If you want the Rust pipeline, run `reflex run-rust`. Keeping two pipelines reachable from the same command was producing dead branches (`--with-legacy`, `--snapshot-python`, `--profile-memoize`) and was removed. Concretely:
+ - **Scaffold missing** → hard error, telling the user to run `reflex init` or `reflex run` once.
+ - **Scaffold present** → `get_and_validate_app()` (~100 ms Python import, no compile) → iterate `app._unevaluated_pages` → `compile_unevaluated_page` per route (evaluate user Python, apply theme styles, wrap in Fragment+title+meta) → bridge → Rust emits JSX → Python writes `.web/app/routes/*.jsx`. Target: **< 500 ms total** for the docs app.
+ - **Pipeline divergence debugging** is a `reflex run` vs `reflex run-rust` comparison done by the developer, not a flag inside `run-rust`.
+
+4. **Phased Rust takeover of jobs currently done in the legacy compile** (in the order they need to land for `run-rust` to reach parity with `reflex run` on every axis):
+
+ | order | job | currently in Python | Rust takeover |
+ |-------|-----|---------------------|---------------|
+ | 1 | Page module JSX | `compile_page_from_context` + `templates.page_template` | ✅ landed (`reflex_codegen::page::emit_page`) |
+ | 2 | Memoize **decisions** (`_should_memoize`) | `MemoizeStatefulPlugin` walk | port over IR, in `reflex_semantic`; saves ~230 ms on docs |
+ | 3 | Memoize **wrapper definitions** (`_build_wrapper` + `create_passthrough_component_memo`) | Python Component-class machinery | this is the big one (~1.2 s on docs). Needs Rust Component-graph rep that supports `{children}` hole substitution. |
+ | 4 | Memoize wrapper **file emit** | `_compile_single_memo_component` + `templates.memo_single_component_template` | same template machinery as page emit; small `export const = memo(({children}) => …)` shell. |
+ | 5 | Plugin walks (Radix camelCase, `_get_all_imports` aggregation, etc.) | various `enter_component`/`leave_component` plugin hooks | bridge harvests what's needed; Rust aggregates in `reflex_semantic` |
+ | 6 | Theme CSS, context shell, app-wrap, vite config | various `compile_*` functions in `compiler.py` | ✅ landed (`reflex_codegen::{theme,context,app_root,vite}`) |
+
+ **Until job #3 lands, `run-rust` ships pages without runtime memoize wrappers.** The trade-off: faster compile, slower React re-renders. `reflex run` remains the production-perf path for users who need runtime memoization today.
+
+5. **What `reflex.compiler.ir.bridge` may legitimately depend on from `reflex_base`:**
+ - `Component.tag`, `Component.alias`, `Component.library`, `Component.children`, `Component.event_triggers`, `Component.id`, `Component.class_name`, `Component.key`, `Component.custom_attrs`, `Component.get_props()`, `Component._memoization_mode`, `Component._is_tag_in_global_scope` — purely attribute reads from already-constructed Components.
+ - `Var._js_expr`, `Var._get_all_var_data()`, `VarData.{hooks,imports,state,deps,position,components}` — same, attribute reads only.
+ - `format_library_name` from `reflex_base.utils.format` — a pure string helper.
+ - `LiteralVar.create(value)` — needed to format `EventChain` / dict / list values into JS expressions, since Reflex's Var system owns that representation. This is a constructor call, not a compile step.
+
+ It must *not* call `compile_*`, `render_*`, or anything that runs the plugin chain. If it does, we've leaked legacy compile work into the Rust pipeline.
+
+---
+
+**Implementation status snapshot (2026-05-16).** All 11 D-items have landed in some form; see §8 for per-item caveats. Python side has `reflex.compiler.ir.{schema,builder,canonical,pack,bridge}` + `reflex.compiler.session.CompilerSession` + `reflex.compiler.markdown`. End-to-end pipeline works: Python builds an IR tree → `msgpack.packb` → Rust parses, aggregates, emits, caches → returns rendered JS. Source maps wired through (`compile_page_with_sourcemap`). Two PyO3 wheels (compiler + markdown) with full CI matrix. **51 Rust tests + 49 Python tests + 18 corpus fixtures green.** Synthetic 200-page app cold-compiles in 1.9 ms; markdown wheel is 110× faster than mistletoe.
+
+**End-to-end browser verification (2026-05-16).** `examples/rust_compiler_demo/` ships a working counter app where the page JSX is compiled by the Rust pipeline and served by Vite via React Router. The new CLI command `uv run reflex run-rust` runs the normal `reflex compile` to scaffold `.web/`, then re-emits each `.web/app/routes/*.jsx` directly from the Rust compiler — **no Python postprocessor**. A headless Chromium loads the served page and renders "Counter demo / count: / 0 / − / + / reset" with zero page errors — the state value `0` is pulled from the React context, the unicode minus glyph round-trips correctly through the Rust JS-string encoder, and `jsx(RadixThemesBox, …)` calls reach radix-ui as expected. Per-page Rust compile time on this app: **49.8 µs vs 2027.2 µs for the legacy Python compiler (38.6× faster)**.
+
+**Schema v2 (2026-05-16).** `SCHEMA_VERSION` bumped to 2. Page IR gained three trailing positional fields — `component_imports: [(module, alias_spec)]`, `state_bindings: [str]`, `needs_ref: bool` — that the bridge harvests from the Component tree (walks `library`/`tag`/`alias` for imports, scans every Var's `_js_expr` for state-context references, checks `id` props). The Rust `page::emit_page` uses them to emit the React-runtime-compatible module shell directly: import block grouped by module with per-module dedup, `useContext(StateContexts.)` lines, optional `useRef`, and `export default function Component()` as the React-Router-expected default. `jsx::emit_prop_name` camelCases known snake_case props (`class_name`→`className`, `on_click`→`onClick`, etc.).
+
+**Visual parity confirmed (2026-05-16).** Side-by-side headless screenshots of the counter demo (one capture from `reflex run`, one from `reflex run-rust`) show **pixel-identical** Radix Themes rendering: same heading typography, same ``-with-soft/solid/outline variants, same flex column layout. 2197 CSS rules load, same Radix `rt-Box`/`rt-Text`/`rt-Button` classes are applied, same `light` theme class on ``. The remaining page-module differences are byte-level only — semantically equivalent emit shape. (Earlier iterations shipped an in-CLI `--snapshot-python` + `reflex.compiler.diff_pipelines` helper for this; the helper is gone now that the two pipelines are reached through their own commands.)
+
+**Full-stack round-trip (2026-05-16).** `reflex run-rust` (no `--frontend-only`) starts both Vite (`:3000`) and the Reflex backend. Playwright drives the counter demo via real button clicks: 3× `+` → count = **3**, 1× `−` → count = **2**, `reset` → count = **0**, zero page errors. Websocket connects to the backend, event handlers dispatch through `ReflexEvent(...)`, state delta updates the count Heading. `run-rust` is a functional drop-in replacement for `run` on this app *modulo* runtime memoize (phase-3 work — see §0a).
+
+**`run-rust` is single-mode (2026-05-16).** Per §0a rule 3, `run-rust` no longer has a `--with-legacy` escape hatch or a `--snapshot-python` flag. There is one path: scaffold-must-exist → `get_and_validate_app()` (Python import only) → `compile_unevaluated_page` per route → bridge → Rust → write `.web/app/routes/*.jsx`. The legacy compile is reachable through `reflex run`; that's the fallback. The new public surface in `reflex.compiler.rust_pipeline` is just `scaffold_exists()` and `compile_pages()`. **Measured on the docs app**: ~2.0 s end-to-end (1.2 s app import + 0.78 s Rust compile of 6 routes), versus ~3.1 s on `reflex run`. Runtime memoize is not applied until §0a phases 2/3 land; `reflex run` remains the production-perf path for users who need it today.
+
+**Memoize-port plan (2026-05-16).** Profiled the legacy memoize plugin on the docs app — it's ~1.9 s of the 4.1 s compile (47%). Breakdown:
+
+- `_build_wrapper` 686 ms — builds per-component `ExperimentalMemoComponentDefinition`s
+- `create_passthrough_component_memo` 530 ms — copies Components, substitutes `{children}` hole
+- `_compile_memo_components` (incl. write-to-disk) 484 ms self — runs the wrapper render template per memo
+- `_should_memoize` 233 ms — the decision walk
+
+End-to-end Rust port is a multi-phase project:
+
+1. **Phase 1**: port `_should_memoize` decision logic to Rust over IR. The bridge already serializes `VarData.state`, `VarData.hooks`, event_triggers, and Component class identity; add `memoization_mode` and `is_snapshot_boundary` IR fields and replicate the legacy walk in `reflex_semantic`. Saves the 233 ms decision cost. **Concrete, bounded — start here.**
+2. **Phase 2**: port wrapper-template emission to Rust. Treat each wrapper's body as a mini-page; pipe through the existing bridge → IR → `emit_page` pipeline with a "wrapper mode" output (`export const = memo(({children}) => …)`). Replaces `_compile_single_memo_component`. Saves the 484 ms render cost.
+3. **Phase 3**: port wrapper *construction* — the slow part. `_build_wrapper` + `create_passthrough_component_memo` together are ~1.2 s. These copy Components and substitute `{children}` holes inside Python. To replace, the bridge runs *before* memoize, the Rust side does its own walk and template substitution, and the legacy plugin is never called. Multi-week port; needs a Rust Component-graph representation that survives `{children}` hole substitution. Yields the bulk of the speedup.
+
+**Memoize benchmark (2026-05-16).** Measurement infrastructure for the port lives outside `run-rust`: `scripts/benchmark_memoize.py` runs the legacy compile and reports per-bucket cumtime (decide / leave_component / build_wrapper / passthrough_memo / compile_memo_files). `--update-baseline` writes `.memoize_baseline.json` next to `rxconfig.py`; `--check` exits non-zero on >5% regression. Docs-app baseline locked at: wall 3220 ms / decide 178 ms / leave_component 838 ms / build_wrapper 683 ms / passthrough_memo 539 ms / compile_memo_files 317 ms. Every memoize-port iteration measures against these numbers. (Previously this also lived under `reflex run-rust --profile-memoize`; that flag was dropped along with `--with-legacy` since `run-rust` no longer runs the legacy compile.)
+
+**Docs app shakedown (2026-05-16).** Pointed `CI=1 uv run reflex run-rust --frontend-only` at the real Reflex docs app (`docs/app/`, 27 evaluated pages, ~10k nodes). Five bridge bugs surfaced and got fixed in this iteration:
+1. **`VarData.imports` shape** — Reflex stores it as `ParsedImportTuple = tuple[tuple[str, tuple[ImportVar, ...]], ...]`, not a `dict`. Bridge now handles both shapes.
+2. **Dotted Radix subcomponents** (`TextField.Root`, `Drawer.Trigger`, `Popover.Root`) — the import binding must strip at the first `.` (`{TextField as RadixThemesTextField}`), while the JSX call site keeps the dotted access (`jsx(RadixThemesTextField.Root, …)`).
+3. **VarData imports skipped `format_library_name`** — packages with version pins (`@hugeicons/core-free-icons@4.1.1`) were ending up in `from ""` lines that Vite couldn't resolve.
+4. **`_var_data` ≠ merged var data** — direct attribute access only carries the *locally declared* metadata; inherited imports (e.g. `cn(...)` calls bringing in `clsx-for-tailwind`) live in `_get_all_var_data()`. Bridge now uses the merged getter.
+5. **Foreach `render_fn` needs typed args** — synthetic `Var(_js_expr=name, _var_type=None)` arg vars fail on `item["key"]`. Bridge now delegates to `Component._render().render_component()` (the legacy `IterTag` path) which builds properly-typed `ArrayCastedVar`/`ObjectVar` args via `get_arg_var()`.
+
+Plus two cleanup filters: skip empty-module imports (those are side-effect-style `import "";` imports and don't belong inside `{…}` braces), and skip non-identifier alias specs.
+
+End-to-end on docs: scaffold is laid down once by `reflex run` (~2.8 s), then **`reflex run-rust` emits all 7 routes in ~290 ms**, no Vite transform errors, no playwright pageerrors. (The docs root URL itself shows React-Router 404 — same behavior under `reflex run`, unrelated routing-config issue in the docs app.)
+
+**Page title + `, jsx("title", {}, ""), jsx("meta", {…}, ))` whenever a page declares a title or has any meta entries (matching the legacy template). `rust_pipeline._resolve_page_title` resolves both `str` and `Var` titles from `UnevaluatedPage.title`; `_resolve_page_meta` reads per-page `meta` mappings and always appends the default `og:image=favicon.ico`. Headless browser confirms `document.title === "Counter"` and `` + `<meta>` wrap | Python, builds 3-4 Component instances | <0.1 ms/route | Skip — costs nothing |
+| `_compile_page` body (`_get_all_*` × 5, `render()`, `templates.page_template`) | Python — the 61% mechanical bucket | 12 ms/route | **Already in Rust** — that's what the existing `rust` stage does |
+| Memoize plugin (`_should_memoize` + `_build_wrapper` + `create_passthrough_component_memo` + `_compile_single_memo_component`) | Python — ~1.9 s on docs app, currently skipped under `run-rust` so memoize regresses at runtime | 4-8 wk | Rust port over PyO3-read Component tree (depends on 1b) |
+
+Memoize is the biggest still-Python chunk. Once 1b lands (Rust can read Component trees natively), the memoize port has a clean target: walk the tree in Rust, decide memoize, build wrapper components by emitting JSX directly (skip the Python `_build_wrapper` round-trip).
+
+### Sequenced work (locked)
+
+Two sequenced levers — that's the whole plan. Everything else is a polish follow-up.
+
+| # | Lever | What lands | Goal |
+|---|-------|------------|------|
+| **a** | **Cut bridge cost** — option 1b: Rust reads `Component` PyObjects directly via PyO3 `getattr`, no msgpack | New `crates/reflex_pyread` walks Components and `Var._get_all_var_data()` natively. **`reflex/compiler/ir/bridge.py` deleted 2026-05-17**; the msgpack schema (`reflex.compiler.ir.{schema,builder,canonical,pack}`) survives as a debug/diagnostic module for IR-shape tests that still build IR programmatically, but no production path goes through msgpack. | **Shipped 2026-05-17.** Measured: pyread stage 3.28 ms/route vs bridge+rust 3.97 ms/route on `synthetic:20` (**1.21× faster**, not the 40× the spike microbenchmark projected — most bridge cost is Python-side `_get_all_var_data()` walks that pyread also pays). Net Rust pipeline 666 → 625 ms. 18/18 corpus + 6/6 docs routes byte-identical. Parallel-load test: pyread 67 ms vs bridge+rayon-rust 96 ms on the 20-route batch — pyread wins under load too. |
+| **b** | **Push more mechanical work into Rust** — memoize phase 3 (theme-apply dropped, phase 2 investigated but not shipped — see below) | (1) ~~`_should_memoize` decision walk in Rust~~ — ported byte-parity (546 calls / 0 mismatches) but **11% slower** standalone due to PyO3 boundary cost; kept as a foundation, used by the orchestrator. (2) `emit_memo_module` + `compile_memo_from_component` — pyread walks the wrapper body, codegen produces the `memo()` module. (3) Orchestrator (`rust_memo.walk_and_memoize` + `rust_pipeline.compile_pages` integration) — substitutes wrappers into each page tree, emits per-memo `.jsx` files, all driven from `run-rust`. **Shipped end-to-end 2026-05-17.** | Docs app: 6 pages + 371 unique memo modules in 1068 ms (was ~2.0 s w/o memoize, ~5.8 s in `reflex run`). Hook-harvest in pyread is a follow-up that gates correctness for hook-referencing memo bodies (task #16). |
+
+**Theme-apply walk dropped from lever (b) (2026-05-17).** Earlier drafts of this section listed `_apply_recursive_style` as the first step of lever (b). Measured: 1.49 ms/route on `synthetic:20` (~90 ms total). When I went to port it, the reality is that `Component._add_style_recursive` dispatches into each component class's `_add_style()` virtual method — that's **framework code per §0a rule 1**. Replacing it would either require porting every Reflex component's default-style logic to Rust (which is exactly the framework port we're trying to avoid), or having Rust call back into Python for each `_add_style()` (which moves the work without reducing it). Neither is a real win. The ~90 ms theme-apply cost stays in Python; lever (b) is now memoize-only.
+
+**Order is mandatory.** (b) is unblocked *by* (a) — once Rust can read Component trees natively, the memoize port has a clean target (walk in Rust, decide in Rust, emit wrapper JSX in Rust, never round-trip the IR). Doing memoize before (a) means re-doing the bridge work twice.
+
+Polish follow-ups (after both land, not part of the locked plan):
+
+- Rayon parallel page emit — cheap once (a) drops the GIL after the page-tree read; gets linear scaling on the synthetic 200-page test.
+- Option 1c (per-subtree GIL release so theme-apply + pyread + codegen overlap) — only worth it once (a) is settled.
+- Theme CSS + context shell + app-wrap + vite config — already shipped per §0a; keep an eye on regressions.
+
+### Endgame numbers (revised, post-microbenchmark)
+
+| Bucket | Today (Python) | `run-rust` today | After lever (a) (PyO3 reader) | After (a) + (b) (theme + memoize) |
+|---|---:|---:|---:|---:|
+| App import (one-shot) | 1.2 s | 1.2 s | 1.2 s | 1.2 s |
+| `framework` (page eval + theme + wrap) | 0.45 s | 0.45 s | 0.45 s¹ | 0.45 s |
+| `py_mech` (tree walks + render + template) | 0.72 s | — | — | — |
+| `bridge` | — | 0.24 s | 0³ | 0³ |
+| `rust` (mechanical work) | — | 0.01 s | 0.01 s | 0.03 s² |
+| `pyread` (fused bridge + rust) | — | — | 0.20 s | 0.20 s |
+| Memoize | (folded into py_mech) | not applied | not applied | <0.05 s |
+| **Per-route compile pipeline, 20-route synthetic** | **1.17 s** | **0.67 s** | **0.62 s** | **~0.50 s** (with (b) memoize) |
+| **Speedup vs Python** | 1.0× | 1.67× | **1.79×** | **2.34×** (+ memoize correctness) |
+
+¹ Theme-apply slice migrates as the first step of lever (b); small additional drop expected (~50 ms on the synthetic).
+² Rust grows slightly when memoize compute moves in (later step of lever (b)).
+³ Pyread replaces the bridge entirely; the "bridge stage" is 0 in the after-(a) world and the work moves into `pyread`. Measured pyread (3.28 ms/route × 20 × 3 runs) is **1.21× faster** than the bridge+rust pair it replaces, not the 40× the spike projected — the bridge's cost was mostly Python-side `_get_all_var_data()` work that pyread also pays.
+
+The ceiling lives at **~2× total pipeline speedup after lever (a) alone**, rising to **~2.3-3×** with lever (b)'s theme-apply + memoize ports. The previously-claimed 70-140× was conditional on porting `Var`/`Component` to Rust; that direction is off the table.
+
+### What 1b actually looks like
+
+A new crate `crates/reflex_pyread` whose entry is something like:
+
+```rust
+fn read_component<'py>(py: Python<'py>, comp: &Bound<'py, PyAny>) -> Result<Component<'arena>, PyReadError> {
+ let tag: &str = comp.getattr("tag")?.extract()?;
+ let children = comp.getattr("children")?;
+ let mut child_nodes = bumpalo::collections::Vec::with_capacity_in(children.len()?, arena);
+ for child in children.iter()? {
+ child_nodes.push(read_component(py, &child?)?);
+ }
+ // … same shape for props, event_triggers, hooks, var_data
+}
+```
+
+The contract with the Python framework is the same one the bridge already encodes: read these specific attributes (`.tag`, `.alias`, `.library`, `.children`, `.event_triggers`, `.props`, etc.) plus `Var._js_expr` and `Var._get_all_var_data()`. No new requirements on the framework. **No framework code is modified.**
+
+### Done-criteria addition (folds into §13)
+
+- [x] **`crates/reflex_pyread` landed** — walks Component PyObjects via PyO3 `getattr`, builds the same `Page<'arena>` IR the msgpack parser builds. Covers Bare/Fragment/Cond/Foreach/Match/Element + Var/VarData + EventHandler + page-level harvest (component_imports, state_bindings, needs_ref).
+- [x] **`CompilerSession.compile_page_from_component(ident, component, route, ...)`** exposed; `reflex.compiler.rust_pipeline.compile_pages` calls it by default. `REFLEX_RUST_BRIDGE=msgpack` falls back to the legacy bridge path for diagnosis.
+- [x] **Byte-parity validated.** All 18 corpus fixtures + all 6 docs-app routes produce JS that is byte-identical between pyread and bridge+rust.
+- [x] **Bridge-replacement benchmark recorded.** `synthetic:20` × 3 runs: pyread stage = **3.28 ms/route** (vs bridge 3.80 + rust 0.17 = 3.97 ms/route). Pyread is **1.21× faster** than bridge+rust; total Rust pipeline drops from 666 → 625 ms (~6% wall-clock). **The plan's projected `<0.2 ms/route` bridge target was based on the spike's 100 ns/PyO3-call number times 5 attrs/node — but the real bridge cost is dominated by `_get_all_var_data()` walks and other Python-side work that pyread can't skip.** Both paths pay roughly the same Python tax; pyread wins by skipping msgpack pack/unpack and one Vec materialization.
+- [x] `reflex/compiler/ir/bridge.py` deleted; `reflex.compiler.ir` is now a debug-only msgpack dump module. No production code path imports the bridge. The `REFLEX_RUST_BRIDGE` env var and msgpack fallback in `rust_pipeline.py` were removed at the same time — one path only.
+- [x] ~~`compile_unevaluated_page`'s theme-apply walk moved to Rust~~ — **dropped.** Investigation 2026-05-17 found `_add_style_recursive` dispatches into each component class's `_add_style()` virtual method, which is framework code per §0a rule 1. Measured cost was only 1.49 ms/route (~90 ms total on synthetic:20). Plan revised; theme-apply stays in Python.
+- [~] **Phase 2 (memoize decisions in Rust) — investigated, not shipped.** `reflex_pyread::memoize::should_memoize` ports `_should_memoize` + `_subtree_has_reactive_data` to Rust over PyO3 reads. Byte-parity proven: 546 `_should_memoize` calls intercepted across `tests/units/compiler/test_memoize_plugin.py` (108 tests) with **zero mismatches**. But the standalone Rust port runs **11% slower than the legacy Python predicate** (4.74 µs/comp vs 4.28 µs/comp on 3210 synthetic components) — every decision input is a PyO3 `getattr`/`call_method` round-trip (~100 ns each × ~10-15 lookups/node), and the boundary cost beats the Python-interpreter saving. The code stays in-tree as a foundation for phase 3 but is **not wired into `reflex run`** (it would slow that path down). When phase 3 lands, the decision will move inline during the pyread walk so the harvest cost is amortized.
+- [~] **Phase 3 (memoize emit + orchestrator + root.jsx) — wired end-to-end, hook harvest missing.** `reflex_codegen::memo::emit_memo_module` + `CompilerSession.compile_memo_from_component(...)` produce the `export const <name> = memo(...)` shell (replaces `templates.memo_single_component_template`). `reflex/compiler/rust_memo.py::walk_and_memoize` drives the page-tree walk: bottom-up, calls `session.should_memoize` per node, builds wrappers via the framework helper `create_passthrough_component_memo`, substitutes them into the page tree, and stages each unique memo body for emit. `rust_pipeline.compile_pages` writes per-memo `.web/utils/components/<name>.jsx` files alongside page `.jsx` files, **and** emits `.web/app/root.jsx` via the legacy `compile_app_root` helper (one-shot framework composition; the React Router root module). Docs app measurement: 6 pages + **371 unique memo modules** + root in **~1062 ms** end-to-end; `reflex run-rust --frontend-only` now boots the docs app without the React Router "missing root.tsx" error. **Known gap:** pyread doesn't yet harvest per-component hooks (`_get_hooks_internal`/`_get_vars_hooks`/`_get_added_hooks`), so memo bodies that reference hook-defined identifiers (e.g. `useMemo(generateUUID, [])`) emit identifiers that aren't declared inside the memo body. Same gap exists for regular pages but doesn't bite on the corpus/docs page-level path. Tracked as task #16.
+- [ ] Total `run-rust` pipeline on the 20-route synthetic ≤ 500 ms (vs current ~625 ms). **Remaining gap lives in `framework` (page eval + theme apply + wrap) — only lever (b) reduces it without touching framework primitives.**
+
+---
+
+## 1. Locked decisions
+
+| Decision | Choice | Rationale |
+|---|---|---|
+| **Scope** | Compiler + Var-expr codegen + theme/CSS/context codegen | Component, State, and Var **classes** stay Python; their `_js_expr` strings + VarData are part of the IR. Rust never parses Python source. See §4 for the exact IR fragments. |
+| **Success metric** | Both, dev-first | Sub-second hot reload first; linear cold build at 200+ pages second. |
+| **Integration** | PyO3 from day one, abi3-py310 | One abi3 wheel per platform = 7 wheels per release, not 28. |
+| **Fallback** | `REFLEX_COMPILER={rust,python,auto}` env var; default `auto` | `auto` = use Rust if wheel imports, fall back to Python compiler. The Python compiler stays in-tree until done-criteria are met. No subprocess. |
+| **Authorship** | AI-first, human-reviewed | Bun model. Snapshot corpus is non-negotiable. |
+| **Output equivalence** | Semantic + normalizer | Not byte-identical. Normalizer rules documented in corpus. Source maps (§4.6) keep diagnostics tractable. |
+| **IR serialization** | msgpack via custom Rust deserializer; arena allocation only for multi-pass queries | Hand-rolled msgpack reader using `rmp::decode::read_*` is mandatory from D4 — measured **25× faster than rmp-serde** at 10k nodes (spike). Python side builds a per-page list-of-lists and calls `msgpack.packb` **once** — measured 5-7% faster than `msgpack.Packer.pack_*` streaming because msgpack-python is C-implemented and one C call beats N Python-call headers. Wire format is positional msgpack arrays (not maps) — short keys ("k", "t") are <10% gain but cleaner-typed; both are acceptable. |
+| **IR identity for Salsa** | `xxh3_64` content hash per node, **with debug-mode collision verification** | Pure function of content. On cache-hit, debug builds re-hash + byte-compare canonical IR; release builds trust the hash. |
+| **Salsa input granularity** | **One `#[salsa::input]` per page** (`PageIr`), plus one each for theme, global state, plugin manifest | Matches ty's per-`File` granularity (`ruff_db/src/files.rs:327`). Editing one page bumps one input, not all of them. |
+| **Plugin protocol** | **Three-phase**: `pre_compile` (Python), `enter/leave` (Python, IR-round-tripped), `post_build` (Python) | The single `(ir) -> ir` claim is wrong — see §4.7. Memoize hooks the tree-walk phase; embed/tailwind/sitemap hook pre-compile and post-build. |
+| **File watcher** | Python-side `watchfiles` | Already in Reflex. On change → re-import → emit new IR → Rust diffs by content hash. |
+| **Wheel matrix** | linux x86_64 (manylinux+musllinux), linux aarch64 (manylinux), macos arm64+x86_64, win x86_64; abi3-py310 (one wheel covers 3.10–3.13) | Matches Reflex's stated support. abi3 keeps the matrix at 7 wheels. |
+| **Maintainer split** | Freeze Python compiler features at corpus-merge | Bug fixes backported both sides. New features Rust-only. Python compiler deletable per §13. |
+| **Rust toolchain** | stable, MSRV pinned in `rust-toolchain.toml` | No nightly features (would block downstream packaging). |
+| **Async** | None | Compiler is CPU-bound. Async adds complexity for zero gain. Use `rayon` for parallel in D10. |
+| **Error handling** | `thiserror` enums per crate; `miette` for user-facing diagnostics | No `anyhow` in library code. |
+| **Logging** | `tracing` with `tracing-subscriber` | One ecosystem. Salsa already integrates. |
+
+**What stays Python (the inventory):**
+
+- Component class hierarchy + `.create()` evaluation (`packages/reflex-base/src/reflex_base/components/component.py`, 2,741 LOC)
+- State class hierarchy + Pydantic instantiation + `.dict(initial=True)` (`reflex/state.py`, 2,655 LOC)
+- Var system construction (`packages/reflex-base/src/reflex_base/vars/`, 8,810 LOC) — Rust receives finalized `_js_expr: str` + `VarData`, **never** re-derives them
+- Plugin `pre_compile` and `post_build` hooks (run before/after Rust)
+- Plugin `enter/leave` tree-walk hooks (round-tripped through IR — see §4.7)
+- File I/O (Rust returns `HashMap<String, Vec<u8>>`; Python writes, with orphan deletion)
+
+**What moves to Rust:**
+
+- Six aggregator walks (`_get_all_hooks`, `_get_all_imports`, `_get_all_dynamic_imports`, `_get_all_custom_code`, `_get_all_refs`, `_get_all_hooks_internal`) — re-derived from IR, never run in Python before send
+- JSX emission (`_RenderUtils.render` + templates)
+- Theme CSS codegen (Emotion stylesheet)
+- Root stylesheet codegen
+- Context file codegen (initial state JSON wrapper, client storage config wrapper — the state *values* come from Python; the JS shell is emitted in Rust)
+- App-root wrapper codegen
+- Memo-component file emission (one `.jsx` per custom component + index)
+- Vite config emission
+- Salsa-cached incremental re-emit on edits
+
+---
+
+## 2. The Eight Rules + tracked-access invariant (performance discipline)
+
+These rules eliminate the "stop and decide" moments. They apply to all Rust code in the compiler crates.
+
+### R1. Arena rule (conditional — see caveat)
+Every IR node, every intermediate node, every emitted string fragment that is **read more than once** is bumpalo-allocated. The arena is created per `compile_app()` call and dropped at the end. **No heap allocations during compilation** except: (a) the arena's own slab growth, (b) the final output `Vec<u8>` returned to Python, (c) Python string objects on the way out via PyO3.
+
+> **Spike finding (2026-05-16).** For *single-pass* parse-and-emit, the arena is **30% slower** than streaming bytes → output buffer directly (`walk_arena_emit` 1.29ms vs `walk_manual_emit` 0.98ms at 10k nodes). The arena pays for itself only when ≥2 passes happen over the parsed tree. Codegen queries that parse-and-emit in one pass are explicitly allowed to skip the arena (R1 carve-out). The arena is mandatory for §7 multi-walk queries — the 6 aggregator walks reuse one parsed tree, which is the actual argument for materializing into the arena.
+>
+> **Caveat vs the bun reference.** Bun uses `MimallocArena` (supports `reset_retain_with_limit`); we use `bumpalo::Bump` (`reset()` retains the largest chunk, may release others). The bun "skip reset if !dirty" trick still applies; the cross-reset page-retention does not. Measure with `cargo bench` before committing to bumpalo — if the loss is >15% on the docs app, switch to a mimalloc-backed arena.
+
+### R2. No-Drop rule
+Every type allocated in the arena must satisfy `!std::mem::needs_drop::<T>()`. Enforce at construction with `const { assert!(!std::mem::needs_drop::<T>()) }` (the oxc pattern at `oxc_allocator/src/allocator.rs:278`). If a type owns a refcount, fd, or heap allocation, it does not go in the arena — period.
+
+### R3. Static dispatch rule
+Traversal traits (`IrVisitor`, `Gen`) are called via generic functions, never `&dyn Trait`. No vtables in hot paths. Every `match` over an IR enum is exhaustive (use `#[deny(non_exhaustive_omitted_patterns)]`).
+
+### R4. Salsa rule + tracked-access invariant
+Every function that derives information from IR input is `#[salsa::tracked]`. **Corollary (the ty discipline, from `ignore/ruff/AGENTS.md`):** any function that reads a node's payload — props, children, hooks, var-data — must be reached through a tracked accessor or be tracked itself. The IR enum's fields are **crate-private**; public access is via `db.props_of(node)`, `db.children_of(node)`, etc. — each `#[salsa::tracked]`. Plain helpers that don't touch any node payload are allowed.
+
+### R5. Interning rule
+All identifiers and namespace strings (`"rx."`, `"$/"`, `"reflex___state____"`, component tag names, prop names) become `Symbol(u32)` at IR construction. Codegen materializes the string only at final byte-emit. All intermediate comparisons are `u32 == u32`.
+
+### R6. Buffer rule
+Codegen writes to one `oxc_data_structures::code_buffer::CodeBuffer` (or equivalent `Vec<u8>` in the arena). No intermediate `String`s. No `format!` in per-node paths — use `write!` directly against the buffer.
+
+### R7. GIL rule
+PyO3 entry point: deserialize msgpack, then `py.allow_threads(|| compile_inner(...))`. The compiler does not hold the GIL. Output is serialized back to bytes inside `allow_threads`; PyO3 wraps in Python objects after. Verify by profiling that GIL hold time is <5% of total compile wall-clock.
+
+### R8. Thread-local rule
+Arena pool, codegen-buffer pool, interner shards: `#[thread_local]` attribute, never `thread_local!` macro. Reason: macro creates a thread-exit destructor that races mimalloc teardown (Bun's `ast_memory_allocator.rs:38-41`).
+
+> **Caveat.** Bun's `ARENA_POOL` is a **single-slot stash**, not a multi-element pool — `ignore/bun/src/ast/ast_memory_allocator.rs:42-56` is explicit: "The pool holds at most one arena (nested scopes — rare — fall back to a fresh `Arena::new()`)." With `rayon` in D10, work-stealing onto a thread that already parked an arena means the *second* page compile on that thread gets a fresh arena. That's correct, just budget for it.
+
+### Two cross-cutting disciplines
+
+**Inline discipline.** `#[inline]` on every per-node visitor method; `#[inline(always)]` on per-character / per-byte buffer writes (the oxc pattern). Trust the compiler to inline match arms only after profiling says it didn't.
+
+**Allocator-skepticism discipline (the Bun lesson).** After porting any hot allocator path, run the fixture benchmark. If the Rust version doesn't beat Python by ≥10× on a fixture that exercises it, the port is wrong. Likely cause: per-call heap init (forgot the thread-local pool), accidental `Drop` (R2 violation), forgotten dirty-bit check.
+
+---
+
+## 3. Crate skeleton (concrete shapes)
+
+> **Status: scaffolded.** `packages/reflex-compiler-rust/` exists with the full layout below. `reflex_py/src/lib.rs` currently holds spike microbenchmark probes; D1-D11 below replace those with the real implementation. The other 7 crates are stub `lib.rs` files. `maturin develop --release` from the package root builds + installs an editable abi3-py310 wheel today.
+
+Workspace member: `packages/reflex-compiler-rust/`. Cargo workspace with these crates:
+
+```
+packages/reflex-compiler-rust/
+├── Cargo.toml # workspace root, members: 8 crates
+├── pyproject.toml # maturin build config, abi3-py310
+├── rust-toolchain.toml # pinned stable
+├── python/reflex_compiler_rust/ # thin wrapper around _native cdylib
+├── scripts/spike_bench.py # napkin-math driver (keeps working post-port)
+└── crates/
+ ├── reflex_ir/ # IR enum types, no logic [STUB]
+ ├── reflex_arena/ # bump arena + thread-local single-slot [STUB]
+ ├── reflex_intern/ # Symbol interning [STUB]
+ ├── reflex_db/ # Salsa Db + storage + tracked accessors [STUB]
+ ├── reflex_semantic/ # IR → lowered IR (Salsa, six aggregators) [STUB]
+ ├── reflex_codegen/ # IR → JS/JSX/CSS strings [STUB]
+ ├── reflex_py/ # PyO3 entry points (the wheel) [SPIKE]
+ └── reflex_bench/ # fixture-driven benchmarks [STUB]
+```
+
+### 3.1 `reflex_arena`
+```rust
+pub struct Arena(bumpalo::Bump);
+
+impl Arena {
+ #[inline(always)]
+ pub fn alloc<T: Copy>(&self, val: T) -> &mut T {
+ const { assert!(!std::mem::needs_drop::<T>()) };
+ self.0.alloc(val)
+ }
+}
+
+#[thread_local]
+static ARENA_STASH: Cell<Option<Arena>> = Cell::new(None);
+
+pub struct PooledArena {
+ arena: Arena,
+ dirty: bool,
+}
+// Drop returns cleaned arena to ARENA_STASH (single slot, not a pool).
+```
+Port semantics from `ignore/bun/src/ast/ast_memory_allocator.rs:22-107`, swapping `MimallocArena` for `bumpalo::Bump`. The single-slot stash is intentional — keep it.
+
+### 3.2 `reflex_ir`
+
+**Field access is crate-private.** Public reads go through Salsa-tracked accessors in `reflex_db` (R4 corollary).
+
+```rust
+#[repr(C, u8)]
+#[derive(Clone, Copy)]
+pub(crate) enum Component<'a> {
+ Element {
+ tag: Symbol,
+ props: &'a [(Symbol, Value<'a>)],
+ children: &'a [Component<'a>],
+ event_handlers: &'a [EventHandler<'a>],
+ hooks: &'a [Hook<'a>],
+ id: NodeId, // xxh3_64(content)
+ source_loc: SourceLoc, // (PyFileId, line, col) — see §4.6
+ },
+ Text { value: &'a str, id: NodeId, source_loc: SourceLoc },
+ Foreach { iter: Var<'a>, body: &'a Component<'a>, id: NodeId, source_loc: SourceLoc },
+ Cond { test: Var<'a>, then: &'a Component<'a>, else_: Option<&'a Component<'a>>, id: NodeId, source_loc: SourceLoc },
+ Memoize { inner: &'a Component<'a>, key: NodeId, id: NodeId, source_loc: SourceLoc },
+ // ... ~30-50 variants total, codegen'd from IR schema
+}
+
+pub(crate) enum Value<'a> {
+ JsExpr { expr: &'a str, var_data: VarData<'a> }, // pre-baked JS string from Python — see §4.4
+ Literal(Literal<'a>),
+ Ref(Symbol),
+}
+```
+All `'a` lifetimes tie to the arena. All variants `Copy`. Codegen from the JSON schema in §4 — never hand-maintain.
+
+### 3.3 `reflex_db` — Salsa boundary
+
+**Lifetimes:** tracked queries return `<'db>`, not `'static`. The earlier draft's `LoweredIr<'static>` was wrong: Salsa tracked outputs are bound to the database borrow (see `salsa/examples/calc/parser.rs:11`: `parse_statements(...) -> Program<'_>`). If a tracked value must survive a revision, it goes through `#[salsa::interned]` (the ty pattern at `ty_python_semantic/src/types.rs:546,7575,7751`).
+
+```rust
+#[salsa::db]
+pub trait Db: salsa::Database {}
+
+#[salsa::db]
+#[derive(Clone, Default)]
+pub struct CompilerDb {
+ storage: salsa::Storage<Self>,
+}
+
+// One input per page — matches ty's per-File granularity.
+#[salsa::input(heap_size = ...)]
+pub struct PageIr {
+ pub route: String,
+ #[returns(ref)]
+ pub bytes: Vec<u8>, // msgpack for one page's tree
+ pub content_hash: u64,
+}
+
+#[salsa::input]
+pub struct ThemeIr { #[returns(ref)] pub bytes: Vec<u8>, pub content_hash: u64 }
+
+#[salsa::input]
+pub struct GlobalStateIr { #[returns(ref)] pub bytes: Vec<u8>, pub content_hash: u64 }
+
+#[salsa::input]
+pub struct PluginManifestIr { #[returns(ref)] pub bytes: Vec<u8>, pub content_hash: u64 }
+
+// Tracked accessors — every read of a node's payload goes through one of these.
+#[salsa::tracked]
+pub fn parse_page<'db>(db: &'db dyn Db, page: PageIr) -> ParsedPage<'db> { ... }
+
+#[salsa::tracked]
+pub fn lower_component<'db>(db: &'db dyn Db, page: PageIr, node: NodeId) -> LoweredIr<'db> { ... }
+
+#[salsa::tracked]
+pub fn emit_page<'db>(db: &'db dyn Db, page: PageIr) -> Arc<str> { ... }
+
+#[salsa::tracked]
+pub fn emit_theme<'db>(db: &'db dyn Db, theme: ThemeIr) -> Arc<str> { ... }
+
+#[salsa::tracked]
+pub fn emit_context<'db>(db: &'db dyn Db, state: GlobalStateIr) -> Arc<str> { ... }
+```
+
+**Cache eviction.** Salsa keeps every revision until evicted. Strategy: after every successful `compile_app`, call `db.synthetic_write(Durability::LOW)` on the cleanup query; rely on Salsa's built-in LRU per query (`#[salsa::tracked(lru = 256)]` on emit queries) to bound memory. Verify with the 100-reload soak test in §6.
+
+**Arena ownership.** Each `compile_app` creates one `Arena` on the calling thread, lowering populates it, codegen reads from it, output is copied into the returned `Arc<str>` (no arena-borrowed data crosses the Salsa-revision boundary). Per-revision arenas are cheap; cross-revision sharing happens via Salsa-interned values, not arena pointers.
+
+Reference: `ignore/salsa/examples/calc/db.rs`, `ignore/ruff/crates/ruff_db/src/files.rs:327`, `ignore/ruff/crates/ty_python_semantic/src/db.rs`.
+
+### 3.4 `reflex_py` (the PyO3 boundary)
+```rust
+#[pymodule]
+fn reflex_compiler(m: &Bound<PyModule>) -> PyResult<()> {
+ m.add_class::<CompilerSession>()?;
+ Ok(())
+}
+
+#[pyclass]
+struct CompilerSession {
+ db: CompilerDb,
+}
+
+#[pymethods]
+impl CompilerSession {
+ #[new]
+ fn new() -> Self { Self { db: CompilerDb::default() } }
+
+ fn compile_app(
+ &mut self,
+ py: Python,
+ pages: Vec<(String, Vec<u8>)>, // (route, page msgpack)
+ theme: Vec<u8>,
+ global_state: Vec<u8>,
+ plugin_manifest: Vec<u8>,
+ ) -> PyResult<CompiledOutput> {
+ // Update inputs (bump only the ones whose content_hash changed).
+ sync_inputs(&mut self.db, pages, theme, global_state, plugin_manifest);
+
+ py.allow_threads(|| compile_inner(&self.db))
+ .map_err(to_py_err)
+ }
+
+ fn apply_plugin_tree_diff(&mut self, py: Python, route: String, ir_bytes: Vec<u8>) -> PyResult<()> {
+ // Plugin enter/leave round-trip — see §4.7.
+ ...
+ }
+}
+
+#[pyclass]
+struct CompiledOutput {
+ files: HashMap<String, Vec<u8>>, // route → contents; Python writes
+ orphans: Vec<String>, // files to delete (Python does the unlinking)
+ diagnostics: Vec<Diagnostic>,
+}
+```
+`CompilerSession` is long-lived (Python keeps it across reloads). Salsa caches survive between `compile_app` calls — this is what makes hot reload incremental. Rust **does not write files**; the Python side owns the filesystem.
+
+---
+
+## 4. The IR contract (msgpack schema)
+
+Versioned. Changes are breaking changes. Schema version is encoded as the first byte of every blob.
+
+### 4.1 Per-page IR
+
+> **Wire-format note (spike).** Two equivalent encodings; **positional msgpack arrays preferred**. Map encoding (with named keys) adds ~10% to parse cost but is self-describing. The spike (`packages/reflex-compiler-rust/crates/reflex_py/src/lib.rs`) uses positional arrays — keep that as the default. Schema validation runs once on the version byte, not per node.
+
+```
+PageIR = {
+ "v": 1,
+ "route": str,
+ "root": ComponentIR,
+ "title": str?,
+ "meta": [MetaIR],
+ "source_files": [str], # files this page depends on (for source maps)
+}
+
+ComponentIR = {
+ "kind": int, # discriminant
+ "tag": str?, # for Element
+ "props": [[str, ValueIR]], # ordered list, not dict — preserves emit order
+ "children": [ComponentIR],
+ "events": [EventHandlerIR],
+ "hooks": [HookIR],
+ "id": int, # xxh3_64(canonical-bytes-of-content)
+ "loc": [int, int, int], # (PyFileId, line, col)
+}
+
+ValueIR = {
+ "kind": int, # 0=js_expr, 1=literal, 2=ref
+ "data": Any,
+ "var_data": VarDataIR?, # only for kind=0
+}
+
+VarDataIR = {
+ "hooks": [str],
+ "imports": [[str, str]],
+ "state": str?,
+ "deps": [str],
+ "position": int?,
+ "components": [str],
+}
+```
+
+### 4.2 Theme IR
+```
+ThemeIR = {
+ "v": 1,
+ "tokens": {str: str}, # colors, radii, etc.
+ "global_style": str, # raw CSS
+ "appearance": str,
+}
+```
+
+### 4.3 Global state IR
+```
+GlobalStateIR = {
+ "v": 1,
+ "initial_state": Any, # output of state(...).dict(initial=True) — already JSON-ready
+ "client_storage": {str: {str: {str: Any}}},
+ "computed_var_deps": [...], # computed var dependency graph for the wire format
+}
+```
+Initial-state and client-storage *values* are computed in Python (Pydantic + async resolution); Rust emits only the JS shell that wraps them.
+
+### 4.4 Var IR — the `_js_expr` decision
+
+Var operations are **finalized in Python**, then passed to Rust as opaque JS expression strings + VarData. Rust never composes Vars.
+
+Rationale:
+- The Var system is 8,810 LOC of typed-expression-building Python (`packages/reflex-base/src/reflex_base/vars/`). Re-implementing it in Rust is a separate, much larger project.
+- Current `_js_expr` is already final JS source by the time `render()` runs — Rust just splices it into JSX.
+- This caps Rust's Var-related win at "string copy" — that's fine; the win is in the tree walks and codegen, not Var resolution.
+
+If a future iteration moves Var composition into Rust, the `ValueIR` `kind=0` variant becomes a typed expression tree instead of a string. The schema version bumps.
+
+### 4.5 Auxiliary output IRs
+
+`compile_app` emits 8 artifact kinds (`reflex/compiler/compiler.py:1250-1284`). The IR carries inputs for all of them:
+
+| # | Artifact | IR fragment | Codegen owner |
+|---|---|---|---|
+| 1 | Per-page JSX | `PageIR` | Rust |
+| 2 | Theme CSS (Emotion) | `ThemeIR` | Rust |
+| 3 | Root stylesheet | `RootStylesheetIR` (= theme + plugin CSS list) | Rust |
+| 4 | Context file (state + storage) | `GlobalStateIR` | Rust |
+| 5 | App-root wrapper | `AppRootIR` | Rust |
+| 6 | Memo components | `MemoComponentsIR` (declarations harvested during enter walk in Python) | Rust |
+| 7 | Plugin static assets | `PluginAssetsIR` (path + bytes pairs) | **Python** — passed through unchanged |
+| 8 | Vite config | `ViteConfigIR` | Rust |
+
+### 4.6 Source-map schema
+
+Every IR node carries `source_loc: (PyFileId, line, col)`. The `PyFileId` is interned per `CompilerSession` and survives Salsa revisions (it's a `#[salsa::interned]` string). Diagnostics from Rust attach `source_loc` via `miette::SourceSpan`, so a JSX error at line 47 of an emitted page can be back-mapped to e.g. `reflex/components/foo.py:123`. Without this, debugging Rust-emitted JSX is intractable.
+
+### 4.7 Plugin protocol — three phases
+
+The earlier draft's "Python `(ir) -> ir` transform" claim was wrong: existing plugins do not have this shape.
+
+| Plugin phase | Runs | Examples | Mechanism |
+|---|---|---|---|
+| **pre_compile** | Python, before IR emit | embed, sitemap | Plugin registers output paths and writes static files via `add_save_task`. No IR involvement. |
+| **enter / leave** | Python, during tree walk **before** IR emit | memoize | Plugin mutates the Component tree in place using live `_var_data.hooks` + `event_triggers`. Result is then serialized to IR. |
+| **post_build** | Python, after Rust emits | tailwind, sitemap, screenshot | Plugin reads Rust's output manifest, writes additional files (CSS bundle, sitemap.xml, screenshots). |
+
+**Tree-walk plugins (enter/leave) cannot move to Rust in v1.** They depend on live Python object identity, Var resolution, and event-trigger inspection. The IR contract is: Python runs every enter/leave plugin first, then emits IR from the post-mutation tree. Rust never invokes a Python plugin.
+
+If a future iteration wants enter/leave plugins to run in Rust, the round-trip API is `apply_plugin_tree_diff(route, ir_bytes)` on `CompilerSession` (§3.4) — Python sends a transformed sub-tree back to Rust. Round-trip cost must be measured before relying on this.
+
+### 4.8 JSX-emission contract (the output target)
+
+Rust's JSX emission must match the Python normalizer's output for the current emit shape (`packages/reflex-base/src/reflex_base/components/templates.py:52-106`):
+
+- Elements: `jsx(Name, {props}, child1, child2, …)`
+- Match: `match_template(...)` shape from `templates.py:80-106`
+- Cond: ternary `(test) ? then : else_`
+- Foreach: `iter.map((item, index) => ...)`
+- Memoize: `<MemoWrapper key={key}>{inner}</MemoWrapper>`
+
+The normalizer (in the corpus, §6) defines: trailing whitespace stripped, JS object keys sorted, import sort order, generated-id stability. Rust outputs through the normalizer before snapshot comparison.
+
+---
+
+## 5. Profile baseline + targets
+
+Baselines are the **cProfile of the 27-page docs app (10.1s wall)** captured 2026-05-16, not projections. Per-page warm and cold-cumulative are **separate metrics** — the earlier draft conflated them.
+
+### What the current 10.1s actually breaks into
+
+| Bucket | Time | % | Rust-rewritable? |
+|----------------------------------------------|-------:|-----:|:----------------------------|
+| `_get_frontend_packages` (npm subprocess) | 3.77s | 37% | No (subprocess) |
+| `compiler.compile` (per-page render) | 2.81s | 28% | **Yes — prize** |
+| `prerequisites.get_app` (import app) | 2.08s | 21% | No (one-time) |
+| Framework `__init__` imports | ~1.0s | ~10% | No (one-time) |
+| `compile_memo_components` | 0.85s | 8% | **Yes** |
+| Markdown (mistletoe + parse_document) | 0.79s | 8% | Yes (separate pulldown-cmark wheel) |
+
+Inside the 2.81s `compiler.compile`: 10 290 component-tree visits → 273 µs/node. Hot tottime is 2.26M `isinstance`, 954K `getattr`, 1.38M `str.startswith`, 74K `Component._get_vars`. **All polymorphic-dispatch overhead that disappears in a Rust enum + struct-field codegen.** That's the headroom.
+
+### Warm single page (median of 5 runs, complicated_page fixture)
+
+| Stage | Current | Target Rust |
+|---|---|---|
+| Walk + render | 0.45 ms | <0.05 ms |
+| IR emit (Python, list-of-lists + packb) | n/a | <0.10 ms (new cost — spike measured ~0.06 ms/100-node page) |
+| msgpack deserialize (Rust, hand-rolled) | n/a | <0.01 ms |
+| Compile (Rust, all cached via Salsa) | n/a | <0.02 ms |
+| **Total per warm page** | **0.45 ms** | **<0.20 ms** |
+
+### Cold full-app (docs app, 27 pages, no caches)
+
+| Bucket | Current | Target Rust | Notes |
+|---|---|---|---|
+| npm install | 3.7s | 3.7s | untouchable subprocess |
+| Python app import | 2.0s | 2.0s | one-time |
+| Framework `__init__` | 1.0s | 1.0s | one-time |
+| Python `Component.create()` evaluation | (folded into compile bucket above) | unchanged — happens before IR emit |
+| IR emit (Python) | n/a | <0.05s | spike: 10k nodes = 8 ms via `packb` |
+| msgpack deserialize (Rust) | n/a | <0.01s | spike: hand-rolled, 0.8 ms for 10k nodes |
+| Rust compile work (tree walks + emit) | 2.81s → | **<0.10s** | tightened from <0.5s; spike says 50-100× headroom |
+| Memo components | 0.85s → | <0.03s | same code shape as above |
+| Markdown | 0.79s → | <0.05s | pulldown-cmark binding, separate wheel |
+| File I/O (Python write) | small | small | |
+| **Total visible to user** | **~10s** | **~6.5s** | **1.55× cold; ~68% is untouchable npm + import** |
+| **With hot npm cache** | **~6.4s** | **~2.8s** | **2.3× — the realistic dev experience** |
+
+### Cold full-app (200-page synthetic, no caches)
+
+Compile work scales linearly at 104 ms/page Python → <1 ms/page Rust. This is where the rewrite goes from "nice" to "necessary."
+
+| Bucket | Today (projected) | Target Rust |
+|---|---|---|
+| npm install | 3.7s | 3.7s |
+| Python import + create + IR emit | ~6s | ~6s |
+| Compile work (Python: 20.8s; Rust: <0.2s) | 20.8s | <0.5s (rayon over pages) |
+| Plugins + markdown | ~1s | <0.3s |
+| **Total** | **~30s** | **<11s** |
+
+### Hot reload (one page edited) — the primary user-visible win
+
+| Stage | Target |
+|---|---|
+| watchfiles → re-import changed module | <50ms |
+| Re-run Component.create() for the affected page | <30ms |
+| Re-emit IR for that page only | <5ms |
+| Salsa bumps one `PageIr` input → re-runs `emit_page` for that page | <10ms |
+| File write | <5ms |
+| **Total visible to user** | **<100ms** (tightened from <150ms) |
+
+CI regression budget: any fixture worse than its baseline by >5% fails the build. See §6a.
+
+---
+
+## 6. Test corpus (precondition)
+
+- [ ] `tests/codegen_corpus/<fixture>/{app.py, expected/, baseline.json}`
+- [ ] **Tier 1 (~50)** small single-feature fixtures (~20 LOC each): state vars by type, computed vars, event handlers (no args / args / async), `rx.cond`, `rx.foreach`, dynamic components, custom components, each component library import, each plugin solo
+- [ ] **Tier 2 (~10)** combinations: state + foreach + cond + events together
+- [ ] **Tier 3** real apps: docs app, 1–2 AI-Builder apps from reflex.build
+- [ ] **Tier 4** synthetic 200-page app from `scripts/generate_synthetic_app.py` — deterministic seed, random component shapes drawn from Tier 1 building blocks. Not hand-written.
+- [ ] Snapshot runner with `--update-snapshots` mode
+- [ ] **IR snapshot** per fixture (msgpack bytes → JSON dump, gitcommit'd)
+- [ ] Normalizer rules documented (§4.8): trailing whitespace, JS object key order, import sort order, generated-id stability
+- [ ] `baseline.json` per fixture: cold wall-clock, hot wall-clock, allocation count. CI fails on >5% regression.
+
+**Coverage threshold (two metrics, not one):**
+
+- ≥85% line coverage of `reflex.compiler.ir.emit` (the Python IR emitter) from the corpus alone
+- 100% of corpus fixtures produce byte-equal output between Python and Rust **under the normalizer**
+
+**Soak test for cache eviction (§3.3):** run a 100-iteration edit-loop on the docs app via the benchmark harness; peak RSS must stay <500 MB.
+
+---
+
+## 6a. Benchmark script (`scripts/benchmark_compile.py`)
+
+The single command that produces every number in §5.
+
+**Invocation:**
+```bash
+uv run python scripts/benchmark_compile.py # all fixtures, default
+uv run python scripts/benchmark_compile.py docs # one fixture by name
+uv run python scripts/benchmark_compile.py docs --runs 10
+uv run python scripts/benchmark_compile.py docs --profile # cProfile top-25 hotspots
+uv run python scripts/benchmark_compile.py docs --engine=rust # post-D4
+uv run python scripts/benchmark_compile.py --compare # python vs rust side-by-side
+uv run python scripts/benchmark_compile.py --update-baseline
+uv run python scripts/benchmark_compile.py --check # CI mode
+uv run python scripts/benchmark_compile.py --soak=100 # edit-loop stress test
+```
+
+**What it measures (per fixture):**
+- Cold wall-clock, warm wall-clock (median of N=5 subsequent runs)
+- Per-bucket breakdown via `cProfile`: app-import / Component.create / IR emit / msgpack / Rust compile / memoize / markdown / I/O
+- Peak RSS via `resource.getrusage`
+- Output byte-size (so a "fast" port that emits less can't game the score)
+
+**Implementation notes (≤200 LOC):**
+- Reuse `tests.benchmarks.fixtures`
+- Direct call to `reflex.compiler.compiler._compile_page` / `_compile_app` — no subprocess
+- `time.perf_counter_ns` for wall-clock; `tracemalloc` (optional, `--allocs`)
+- `--engine=rust` calls `reflex_compiler.CompilerSession.compile_app()`
+- `--compare` runs both engines on each fixture, prints speedup ratio
+- `baseline.json` at `tests/codegen_corpus/baseline.json`. Schema: `{fixture: {cold_ms, warm_ms, output_bytes, peak_rss_kb}}`
+- `--check` reads `baseline.json`, runs all fixtures, exits non-zero on >5% warm-ms regression
+
+**Existing scaffolding to reuse:**
+- `scripts/profile_compilation_hotspots.py` — cProfile invocation pattern
+- `tests/benchmarks/fixtures.py` — starter fixtures
+- `tests/benchmarks/test_compilation.py` — `_compile_single_pass_page_ctx` for per-page call shape
+
+---
+
+## 7. Python-side prep (lands before the Rust)
+
+- [ ] Define IR schema (§4) as a versioned `reflex.compiler.ir.schema` module — one Python source file per IR fragment (page, theme, state, plugin manifest)
+- [ ] Implement `Component.to_ir() -> list` — return a tree-of-lists in the §4.1 positional-array shape (no per-node `dict`, no `msgpack.Packer` streaming). The caller packs the whole tree with **one** `msgpack.packb(root, use_bin_type=True)` call. **Why one C call:** spike measured `packb` of a tree-of-lists is 5-7% faster than `Packer.pack_*` streaming because msgpack-python descends the structure in C; streaming pays Python-call overhead per header. Same shape for `Var`, `Event`, `Hook`.
+- [ ] `State.to_ir() -> list` — wraps `state(_reflex_internal_init=True).dict(initial=True)` + `_resolve_delta` + client-storage extraction into the same list-of-lists shape; caller `packb`s once. State *codegen* (the JS wrapper) lives in Rust; state *values* are emitted here.
+- [ ] Stable `NodeId = xxh3_64(canonical-bytes)` computed during emit. Canonical-bytes ordering documented in `reflex.compiler.ir.canonical`.
+- [ ] `PyFileId` interner — assigns each Python source file an integer ID. Survives reloads.
+- [ ] Plugin protocol (§4.7): `pre_compile`, `enter/leave`, `post_build`. Document which existing plugin hooks which phase. Memoize moves to `enter/leave` (already there). Embed/sitemap to `pre_compile`+`post_build`. Tailwind to `post_build`.
+- [ ] `reflex.compiler.session.CompilerSession` Python wrapper that holds the Rust `CompilerSession` object across reloads, routes `watchfiles` events, computes per-page content hashes, and only re-sends IR for changed pages
+- [ ] `REFLEX_COMPILER` env-var dispatch: `auto` (default) → try Rust, fall back to Python; `python` → force Python compiler; `rust` → force Rust, hard-fail if wheel missing
+- [ ] Python `watchfiles` integration calls `CompilerSession.compile_app(...)` (Rust delivery, not Rust-internal watching)
+
+---
+
+## 8. Rust work items (D0–D11)
+
+Ordering optimized for dev-first. **Each D-item ships green corpus before the next starts.**
+
+### D0. Scaffold + spike — **DONE (2026-05-16)**
+
+- ✅ Cargo workspace at `packages/reflex-compiler-rust/` with all 8 crates
+- ✅ `pyproject.toml` wired for `maturin develop --release`, abi3-py310
+- ✅ `rust-toolchain.toml` pinned stable
+- ✅ `reflex_py/src/lib.rs` has working PyO3 microbenchmark probes (empty_call, bytes_passthrough, walk_serde, walk_manual, walk_*_emit ×3)
+- ✅ `scripts/spike_bench.py` driver; results at `ignore/SPIKE_RESULTS.md`
+
+D1 inherits the wheel build and Python driver from D0 — no re-scaffolding.
+
+### D1. `reflex_ir` — IR enum + codegen-from-schema — **LANDED (2026-05-16)**
+- ✅ Hand-written first cut of `Component`, `Value`, `Literal`, `EventHandler`, `Hook`, `MatchArm`, `VarData`, `Page`, `Theme`, `GlobalState`, `PluginManifest` — covers §4 schema. Codegen-from-schema deferred to a follow-up once Python `reflex.compiler.ir.schema` lands (§7).
+- ✅ `#[repr(C, u8)]` on `Component` with explicit `= N` discriminants matching the §4.1 `kind` field
+- ✅ All variants `Copy`; lifetime `'a`; `Component::kind()`, `id()`, `source_loc()` accessors. Fields are `pub` for now — the R4 corollary (tracked accessors) lands in D5 when `reflex_db` wraps them in `#[salsa::tracked]`.
+- ✅ `NodeId(u64)`, `PyFileId(u32)`, `SourceLoc { file, line, col }` newtypes. `Symbol(u32)` lives in `reflex_intern` (next bullet).
+- Tests: 3 in `reflex_ir` verifying `Copy`, `!needs_drop`, and `kind()` discriminant agreement.
+- **Reference**: `ignore/ruff/crates/ruff_python_ast/src/generated.rs:125,1298`
+
+### D2. `reflex_arena` — bump arena — **LANDED (2026-05-16)**
+- ✅ `Arena` wraps `bumpalo::Bump` with `alloc<T: Copy>` + `const { assert!(!std::mem::needs_drop::<T>()) }`. `#[inline(always)]` on `alloc`.
+- ✅ MSRV bumped to 1.79 for inline-const blocks.
+- ⏳ Benchmark vs `MimallocArena` baseline — pending D4 once a real workload exists; spike already showed bumpalo is 30% slower than no-arena for single-pass, which §2 R1 caveat now reflects.
+- **Reference**: `ignore/oxc/crates/oxc_allocator/src/allocator.rs:217-301`
+
+### D3. `reflex_arena` — thread-local single-slot stash — **LANDED (2026-05-16)**
+- ✅ `PooledArena { arena: Option<Arena>, used: Cell<bool> }` with `acquire()` pulling from `ARENA_STASH` (stable `thread_local!` macro — see lib.rs header for R8 deviation rationale).
+- ✅ Drop returns to stash, skipping `reset()` when `!used` (the dirty-bit optimization).
+- ✅ Two integration tests: round-trip after drop, and unused-PooledArena-skips-reset.
+- **Reference**: `ignore/bun/src/ast/ast_memory_allocator.rs:22-107` — port semantics (single-slot, not multi-element pool)
+
+### D4. `reflex_py` — PyO3 boundary + `CompilerSession` — **LANDED (2026-05-16)**
+- ✅ `CompilerSession` `#[pyclass]` holding `CompilerDb`. Spike probes preserved alongside the real entry points.
+- ✅ `compile_page(route_ident, page_bytes) -> str` (hot-reload fast path)
+- ✅ `compile_app(pages, theme=None, global_state=None, plugin_manifest=None) -> CompiledOutput` (full-app emit)
+- ✅ `py.allow_threads(...)` wraps every compile call (R7)
+- ✅ Hand-rolled msgpack parser at `crates/reflex_ir/src/parse.rs`. Borrows `&str` from the input where possible, copies into the arena when the lifetime must outlive the input slice. Supports `Page`, `Theme`, `GlobalState`, `PluginManifest` blobs.
+- ✅ Schema version sanity exposed as `_native.SCHEMA_VERSION` (currently `1`).
+- ⏳ Wheel CI (§9) is still to be wired up; today's build is `maturin develop` only.
+
+### D5. `reflex_db` — content-hash cache (Salsa deferred) — **LANDED (2026-05-16)**
+- ✅ `CompilerDb` is an `Arc<Mutex<HashMap<(route_ident, xxh3_64), Arc<str>>>>` with `set_cache_capacity`, `clear`, `cache_len`. Cap-evicts oldest entry when full.
+- ✅ Pitfall 14 collision check noted; release builds trust the hash.
+- ✅ Wired into `CompilerSession` — hot-reload measurement: 6180 ns cold → 290 ns warm (20× speedup on a trivial page).
+- ⏳ **Salsa deferred.** The plan calls for `#[salsa::input] PageIr` + tracked queries; we ship the content-hash HashMap first because it delivers the same user-visible "skip when unchanged" semantic for a single-tracked-query pipeline. The public `CompilerDb::emit_page` surface is the API Salsa will replace once D7 needs cross-query sharing (parsed-tree reuse between aggregator walks and codegen).
+- **Reference**: `ignore/salsa/examples/calc/db.rs`, `ignore/ruff/crates/ty_python_semantic/src/db.rs`, `ignore/ruff/crates/ruff_db/src/files.rs:327`
+
+### D6. `reflex_ir` — visitor trait — **LANDED (2026-05-16)**
+- ✅ `pub trait IrVisitor<'a>` with default `visit_*` methods that call free `walk_*` functions. No `&dyn` (R3) — every visitor monomorphizes.
+- ✅ Methods: `visit_page`, `visit_component`, `visit_value`, `visit_var_data`, `visit_event_handler`, `visit_hook`, `visit_match_arm`, `visit_meta`.
+- ✅ Counter visitor test confirms traversal reaches every node.
+- **Reference**: `ignore/ruff/crates/ruff_python_ast/src/visitor.rs:23-220`
+
+### D7. `reflex_semantic` — aggregator walks — **LANDED (2026-05-16)**
+- ✅ Single-pass `aggregate(page) -> Aggregated<'a>` collapses the six Python walks into one tree traversal. Output is deduped, first-seen order preserved.
+- ✅ Plumbed into `reflex_codegen::page::emit_page` — the rendered module's import block is now driven by the aggregator.
+- ⏳ `dynamic_imports`, `custom_code`, `refs` are schema-v2 placeholders (current §4 schema doesn't carry the relevant fields).
+
+### D8. `reflex_codegen` — JS/JSX emission — **LANDED (2026-05-16)**
+- ✅ `CodeBuffer` (single `Vec<u8>`, no intermediate `String`s; `itoa`/`ryu` for numeric formatting; R6).
+- ✅ `emit_component` matches all 8 Component variants per §4.8 (Element, Text, Foreach, Cond, Match, Memoize, Fragment, Expr).
+- ✅ JS-identifier-safe prop names emit unquoted; non-identifier names emit as quoted string keys. Doubles → `ryu` shortest representation. `"`/`\n`/control characters → JS-escape.
+- ✅ `emit_page` glues parser + aggregator + JSX into a self-contained ES module with grouped imports.
+- ⏳ Source maps deferred — every IR node already carries `SourceLoc` for the lookup, but `miette` integration is a follow-up.
+
+### D9. `reflex_intern` — Symbol interner — **PARTIAL (2026-05-16)**
+- ✅ `Symbol(u32)` with `EMPTY = Symbol(0)` reserved for the empty string. Default impl returns `EMPTY`.
+- ✅ Process-global `Mutex<Interner>` behind `intern(&str) -> Symbol`, `resolve(Symbol) -> Option<&'static str>`, `well_known(&str) -> Option<Symbol>`. Strings leaked into `'static` so resolution is cost-free at emit time.
+- ✅ Common identifiers pre-interned at first use: `rx.`, `$/`, `reflex___state____`, `__reflex_`, plus React hook + JSX attribute names.
+- ⏳ Per-thread sharded interners deferred — single mutex is the first cut. Public API is stable across that change.
+- **Reference**: `ignore/ruff/crates/ruff_python_ast/src/name.rs`; for Salsa-interned variant, `ignore/ruff/crates/ty_python_semantic/src/types.rs:546,7575,7751`
+
+### D10. Theme/context/auxiliary codegen — **LANDED (2026-05-16)**
+- ✅ `emit_theme` — `:root { --token: value }` block + raw global CSS. camelCase / snake_case tokens convert to kebab-case CSS custom properties.
+- ✅ `emit_context` — `createContext` shells + spliced `initialState` / `clientStorage` JSON blobs + `computedVarDeps` map.
+- ✅ `emit_app_root` — `AppWrap` component with state/colorMode providers; plugin stylesheet `import "..."` lines deduped.
+- ✅ `emit_vite_config` — minimal `defineConfig({ plugins: [react()], ... })`, plus a string slot for Python to splice extra plugin calls.
+- ✅ Plugin static assets pass-through (artifact #7) — Python ships path+bytes, Rust copies into the output map verbatim.
+- ✅ All wired into `CompilerSession.compile_app` — full app emits `pages/*.jsx`, `src/styles/theme.css`, `src/context.js`, `src/AppWrap.jsx`, `vite.config.js`.
+
+### D11. Parallelism + production polish — **PARTIAL (2026-05-16)**
+- ✅ `CompilerDb::emit_pages_parallel(&[(ident, bytes)]) -> Vec<Result<Arc<str>, _>>` via `rayon::par_iter`. Cache hits still avoid work; order is preserved. Wired into `compile_app`.
+- ⏳ Source maps wired into `miette` diagnostics — deferred.
+- ⏳ PGO release wheel — deferred.
+- ✅ R7 verification by profiling — deferred to a real workload; current synthetic 200-page run is too short to measure meaningfully.
+
+_(D10/D11 status moved up next to D9 — see above.)_
+
+---
+
+## 9. Wheel CI (day-one work item, gates D4 onwards)
+
+```
+.github/workflows/wheels.yml
+```
+- `PyO3/maturin-action@v1` — handles cibuildwheel internals
+- **abi3-py310**: one wheel covers Python 3.10–3.13 per platform
+- Matrix:
+ - `linux-x86_64-manylinux`, `linux-x86_64-musllinux`
+ - `linux-aarch64-manylinux`
+ - `macos-arm64`, `macos-x86_64`
+ - `windows-x86_64`
+- Total: 6 platforms × 1 abi3 wheel = 6 wheels per release (was 28 in the earlier draft without abi3)
+- Trigger: every PR (build only); tag push (publish to PyPI)
+- A green wheel CI is a prerequisite for merging D4. Don't defer.
+
+**Uncovered platforms** (FreeBSD, ppc64le, riscv64, alpine on edge in containers): `REFLEX_COMPILER=auto` falls through to the Python compiler. No subprocess, no hard failure. The Python compiler stays in-tree until done-criteria are met (§13).
+
+---
+
+## 10. Reference cheat sheet
+
+| Technique | Reference | File:line |
+|---|---|---|
+| Enum AST (kills `isinstance`) | ruff | `ruff_python_ast/src/generated.rs:125,1298` |
+| AST attribute macro (layout) | oxc | `oxc_ast_macros/src/ast.rs:21-65` |
+| Bump arena + needs_drop assert | oxc | `oxc_allocator/src/allocator.rs:217,278` |
+| Thread-local arena stash (single slot, not pool) | bun | `src/ast/ast_memory_allocator.rs:22-107` |
+| Monomorphic visitor | ruff | `ruff_python_ast/src/visitor.rs:23-220` |
+| Codegen buffer + trait | oxc | `oxc_codegen/src/{lib.rs:82,gen.rs:22}` |
+| Salsa db setup (minimal) | salsa | `examples/calc/db.rs:1-66` |
+| Salsa per-file input (production) | ruff | `ruff_db/src/files.rs:327` |
+| Salsa tracked accessors over node payload | ty | `ty_python_semantic/src/types/class.rs:832-848` |
+| Salsa interned (cross-revision) | ty | `ty_python_semantic/src/types.rs:546,7575,7751` |
+| Salsa accumulators (diagnostics fan-in) | ty | `ty_python_semantic/src/types/infer.rs` |
+| Salsa in production at scale | rust-analyzer | `crates/base_db/`, `crates/hir_def/` |
+| Tracked-access invariant (.node() must be tracked) | ruff/ty | `ignore/ruff/AGENTS.md` |
+| maturin + PyO3 setup, abi3 | ruff | `pyproject.toml`, `crates/ruff/` |
+| Port methodology + postmortem | bun | PR #30412, `src/ast/ast_memory_allocator.rs:22-50` |
+
+---
+
+## 11. Pitfalls
+
+1. **First Rust port of allocators is wrong.** Profile after porting; if not ≥10× over Python on a fixture that exercises it, the port is wrong. **Tightened by spike (2026-05-16):** real Python is 273 µs/node on `compiler.compile`; headroom is **50-100×**. A careless port that only delivers 5-10× *looks* fine in isolation but is leaving an order of magnitude on the table. Use the spike's `walk_manual_emit` rate (0.098 µs/node) as the floor target.
+2. **Drop does NOT run in arenas.** R2 enforces this at type level.
+3. **`#[thread_local]` ≠ `thread_local!`.** R8. The macro creates a destructor that races mimalloc teardown.
+4. **Track `dirty` bits** — proportional teardown cost (D3).
+5. **Mark lossy port spots with `// PERF(port):` and `// TODO(port):`** — backlog. Bun's discipline.
+6. **AI sessions decay past ~30k LOC.** Port one fixture-tier at a time; each tier is a green-bar checkpoint.
+7. **PyO3 ABI changes per Python version.** Use abi3-py310 to amortize across 3.10–3.13.
+8. **Salsa needs content-hashing for IR.** Python rebuilds IR every reload. If Salsa key is object identity, every reload is a cold compile. R4 + content-hash NodeId in §4.
+9. **GIL discipline.** R7. Holding the GIL during compile blocks every other Python thread including the watchfiles event loop.
+10. **msgpack schema is a public API.** Versioned. Breaking changes increment `"v"`.
+11. **Tracked queries return `<'db>`, never `'static`.** Salsa example at `salsa/examples/calc/parser.rs:11`. Earlier drafts of this doc had `LoweredIr<'static>` — wrong. Cross-revision sharing goes through `#[salsa::interned]`, not arena lifetimes.
+12. **`rmp-serde` allocates strings to the heap. Defeats R1. VALIDATED — spike measured 25× slower than hand-rolled `rmp::decode` + `&str` borrows from input bytes at 10k nodes.** Hand-write the deserializer into the arena (or borrow `&str` from input for single-pass queries). Do not ship rmp-serde "for now"; the gap is too large to hide.
+13. **Salsa cache memory grows unbounded without LRU caps.** Apply `#[salsa::tracked(lru = N)]` on emit queries; soak-test with 100 reload cycles.
+14. **xxh3_64 collisions exist over a corpus.** Debug builds verify (hash, canonical_bytes) on cache hit; release builds trust the hash.
+15. **The "memoize plugin is already (ir)->(ir) shape" claim is wrong.** Memoize mutates the live Component tree (§4.7). Plugins run in Python before/around IR emission, never inside Rust.
+
+16. **Python-side `msgpack.Packer` streaming is slower than `packb` of a list-of-lists.** Spike-validated: 5-7% slower at every tree size. msgpack-python is a C extension; one `packb` call descends a tree-of-lists in C, whereas calling `Packer.pack_array_header()` per node pays N Python-call costs. `Component.to_ir()` returns a `list` (positional-array shape from §4.1) and the caller `packb`s once — see §7.
+
+17. **Bumpalo arena loses to streaming for single-pass queries.** Spike-validated: 30% slower when you parse-and-emit in one pass. The arena pays off only when ≥2 reads happen against the parsed tree (the 6 aggregator walks in §7/D7 are the canonical case). R1 is now conditional (§2) — codegen queries that genuinely need only one pass may stream parse → output buffer without going through the arena.
+
+---
+
+## 12. Suggested first reads (half a day, before any code)
+
+1. `ignore/bun/src/ast/ast_memory_allocator.rs` (end-to-end, postmortem comments) — 1 hr. Note `MimallocArena` ≠ `bumpalo`.
+2. `ignore/salsa/examples/calc/{db,compile,parser}.rs` — 30 min. Note tracked return type is `<'_>`.
+3. `ignore/ruff/crates/ruff_db/src/files.rs:327` + `ty_python_semantic/src/db.rs` — 1 hr. Note per-file `#[salsa::input]` granularity.
+4. `ignore/ruff/crates/ty_python_semantic/src/types/class.rs:820-900` and `types/infer.rs` (accumulators) — 1 hr.
+5. `ignore/ruff/crates/ruff_python_ast/src/visitor.rs` (full file) — 30 min.
+6. `ignore/oxc/crates/oxc_codegen/src/{lib.rs:1-100,gen.rs:1-200}` — 30 min.
+7. `ignore/ruff/pyproject.toml` + how their wheels are built (abi3) — 30 min.
+8. Bun PR #30412 description + Jarred Sumner's writeup — 1 hr.
+9. `ignore/ruff/AGENTS.md` (the tracked-access invariant) — 10 min.
+
+---
+
+## 13. Done-criteria (the green-bar list)
+
+The rewrite is done when **all** of these are true:
+
+- [x] Spike (§0) report committed at `ignore/SPIKE_RESULTS.md` and shows IR-emit < 30% of current wall-clock (**done — 0.4%**)
+- [ ] Snapshot corpus has ≥60 fixtures across 4 tiers (incl. 200-page synthetic), all green against Rust under the normalizer
+- [ ] ≥85% line coverage of `reflex.compiler.ir.emit` from the corpus alone
+- [ ] Cold-compile fixture benchmark: every fixture beats its Python baseline by **≥30× on the Rust-resident buckets** (tightened from ≥5× per spike calibration — `compiler.compile` headroom is 50-100×, so 30× is the minimum that proves the port wasn't sloppy)
+- [ ] Warm-compile (hot reload): every fixture single-page edit completes in **<100ms wall-clock** (tightened from <150ms)
+- [ ] 200-page synthetic app: cold compile **≤11s wall-clock** (vs ~30s Python projection; floor is ~7s of npm + import that the rewrite cannot touch)
+- [ ] Wheel CI green on all 6 matrix entries × abi3 (one wheel per platform)
+- [ ] `REFLEX_COMPILER=auto` is the default and routes to Rust on supported platforms; Python fallback verified by toggling `REFLEX_COMPILER=python` on the docs app
+- [ ] **Standalone markdown PyO3 wheel ships first** (mistletoe → pulldown-cmark; 0.79s → <0.05s expected). It's independent of the IR work, validates the wheel-distribution + PyO3 story in production, and ships value in days not months.
+- [ ] No `// TODO(port):` markers remain in the hot path (visit + lower + emit)
+- [ ] PyO3 layer holds the GIL for <5% of total compile wall-clock (R7 verified by profiling)
+- [ ] Memory: arena peak <50MB on the docs app; <500MB on the 200-page synthetic; 100-reload soak peak RSS <500MB
+- [ ] Multi-walk benchmark proves the arena pays for itself when ≥2 passes happen over the parsed tree (R1 carve-out from §2 still measures favorably for the 6-aggregator case)
+- [ ] Telemetry: zero open issues tagged `rust-compiler-regression` for 4 consecutive weeks
+
+When all boxes are ticked, `REFLEX_COMPILER=auto` switches its default from "fall back to Python" to "fail hard if Rust wheel missing", and the Python compiler can be deleted.
diff --git a/SPIKE_RESULTS.md b/SPIKE_RESULTS.md
new file mode 100644
index 00000000000..29ef35d3e72
--- /dev/null
+++ b/SPIKE_RESULTS.md
@@ -0,0 +1,344 @@
+# Rust Compiler Spike — Napkin-Math Results
+
+> **Calibration update (2026-05-16, post-cProfile on docs app).** The first
+> draft of this doc compared Rust against a synthetic Python codegen
+> (`walk_emit_join`) that is **~580× faster per node than real Reflex
+> Python**. Real `compiler.compile` on the docs app costs **273 µs/node**
+> (2.81s ÷ 10 290 nodes); the spike's synthetic Python ran at 0.47 µs/node.
+> The conclusion "Rust round trip is *slower* than pure Python" is therefore
+> wrong for the actual baseline — see the new §6 at the bottom of this doc.
+> The other findings (PyO3 crossing free, rmp-serde 25× slower than
+> hand-rolled, streaming pack slower than `packb`, arena loses single-pass)
+> all still hold against the corrected baseline.
+
+Date: 2026-05-16
+Hardware: this machine (Linux 6.14, x86_64), abi3-py310 wheel built with
+`maturin develop --release`, Python 3.14.3, msgpack 1.1.2.
+
+Scaffold lives at `packages/reflex-compiler-rust/`. The probes are inline in
+`crates/reflex_py/src/lib.rs`; the driver is
+`packages/reflex-compiler-rust/scripts/spike_bench.py`.
+
+> Synthetic tree shape: balanced BFS construction with fan-out 3-5 per
+> element, 2-4 props per element, 25% leaf-text probability. Wire format is
+> positional msgpack arrays (the optimistic case for parse speed). Real
+> ComponentIR is a map and will be 10-30% slower to walk.
+
+---
+
+## Headline numbers (per tree size, median over 200-300 iters)
+
+`µs/node` is the rate column — that's the metric to compare across sizes.
+
+| Probe | n=10 | n=100 | n=1k | n=10k | µs/node (10k) |
+|----------------------------------------|------:|------:|------:|------:|--------------:|
+| pyo3 `empty_call` | 60ns | 90ns | 60ns | 70ns | ~0 |
+| pyo3 `bytes_passthrough` (full blob) | 120ns | 160ns | 120ns | 120ns | ~0 |
+| py `msgpack pack via dict` | 5.9µs | 58µs | 672µs | 7.96ms| **0.80** |
+| py `msgpack pack streaming` | 11.9µs| 86µs | 839µs | 8.42ms| **0.84** |
+| rs `walk_serde` (rmp-serde, no emit) | 6.6µs | 87µs | 1.40ms| 19.78ms| 1.98 |
+| rs `walk_manual` (hand-rolled, no emit)| 0.71µs| 5.5µs | 67µs | 767µs | **0.08** |
+| py `walk_emit_concat` | 5.2µs | 52µs | 583µs | 6.10ms| 0.61 |
+| py `walk_emit_join` | 6.1µs | 46µs | 472µs | 4.71ms| **0.47** |
+| rs `walk_serde_emit` | 9.0µs | 161µs | 2.12ms| 28.05ms| 2.81 |
+| rs `walk_manual_emit` (hand + emit) | 1.5µs | 6.9µs | 86µs | 979µs | **0.098** |
+| rs `walk_arena_emit` (bumpalo + emit) | 1.5µs | 9.4µs | 119µs | 1.29ms| 0.13 |
+| **e2e** pack_stream + rs manual_emit | 16.4µs| 100µs | 991µs | 11.14ms| **1.11** |
+
+All variants produce byte-identical output; verified at smoke-test.
+
+---
+
+## What the numbers say
+
+### ✅ PyO3 crossing is free
+
+60-200ns per call regardless of payload size. The plan's "the boundary is
+cheap" assumption holds. No design needs to amortize crossings.
+
+### ✅ Hand-rolled msgpack reader beats rmp-serde by 25×
+
+At n=10k: hand-rolled walk 767µs vs rmp-serde walk 19.78ms.
+With emit: 979µs vs 28.05ms.
+
+This validates Pitfall 12 in the plan ("rmp-serde allocates strings to the
+heap. Defeats R1"). It is **mandatory** to hand-roll the deserializer.
+Building with rmp-serde "for now" and migrating later is not viable — it
+would hide the win below the noise floor and lead to wrong scaling
+conclusions.
+
+### ❌ "No per-node dict" Python packing claim is wrong
+
+§1 says: "Python side uses `msgpack.Packer` writing to one `bytes` buffer
+with no per-node `dict`."
+
+Measured: `pack_streaming` (no dict, calls `packer.pack_array_header()` per
+node) is **5-7% slower** than `pack_via_dict` (build a tree-of-lists, single
+`msgpack.packb` call) at n≥1k.
+
+Reason: `msgpack-python` is C-implemented. One `packb` call descends the
+entire structure in C; streaming pays Python-call overhead per node.
+
+Implication: `Component.to_ir(packer)` should not stream per-node. Either
+(a) build a small list-of-lists for each Component, or (b) write a C
+extension for the streaming case. The current §7 sketch
+("`Component.to_ir(packer: msgpack.Packer)` — direct emission, no
+intermediate dicts") will be **slower** than the obvious alternative.
+
+### ⚠️ Rust codegen win is ~5×, not 5-10×
+
+Apples-to-apples on the same 10k-node tree:
+
+- py `walk_emit_join` (well-written Python codegen): 4.71 ms
+- rs `walk_manual_emit` (hand-rolled, single-pass): 0.98 ms
+- **Speedup: 4.8×**
+
+The plan's §5 target ("Rust compile work 2.81s → <0.5s" = 5.6×) is right at
+the edge of what a single-pass Rust port can deliver. Anything that adds
+overhead — Salsa accounting, source-map recording, map-format IR, multiple
+walks — eats directly into this margin.
+
+### 🚨 End-to-end is *slower* than pure Python at this scope
+
+This is the most uncomfortable finding:
+
+| For a 10k-node tree | wall-clock |
+|-----------------------------------------|-----------:|
+| Pure Python: `walk_emit_join` | 4.71 ms |
+| Round trip: `pack_streaming` + Rust emit| **11.14 ms** |
+
+The msgpack pack on the Python side (8.4 ms) is already 1.8× the pure-Python
+codegen wall-clock. Adding the Rust emit on top makes the round trip 2.4×
+slower than just doing the work in Python.
+
+**This is the napkin-math indictment of the "ship everything to Rust over
+msgpack" model when the Rust work is shallow.** It works only if Rust does
+much more work per byte sent than just JSX emit. Candidates:
+
+1. **Multiple passes per parsed tree** — the plan's 6 aggregator walks
+ amortize over a single parse. With one arena tree retained, walks 2-N
+ are free (the parse cost is gone). Spike has only single-pass numbers;
+ the 6-walk case is the next thing to bench. Until that's measured the
+ plan's win is not proven.
+2. **Salsa-cached hot reload** — the second `compile_app` should be ~free
+ for unchanged pages. The msgpack cost still applies to changed pages
+ only, so the wall-clock floor for hot reload is one page's pack + walk
+ = sub-millisecond. The §5 <150ms target is comfortable on these numbers
+ *if Salsa works as advertised* — which the spike does not exercise.
+3. **Theme/context/memo/vite codegen** — these are O(1) per app, not
+ O(nodes). They are dominated by the Python `compile_app` post-processing
+ work (the §0 "Python-remaining" bucket). Moving them to Rust is a
+ constant-time win that compounds across pages but does not change the
+ per-node math above.
+
+### ⚠️ Bumpalo arena is *slower* than no-arena for single-pass codegen
+
+`walk_arena_emit` (parse into arena, then walk arena to emit) is **30%
+slower** than `walk_manual_emit` (parse and emit in one pass) at every
+size. Reason: arena pays for an extra `alloc_str` copy of every string
+plus arena `Vec` allocation for props/children slices.
+
+This does **not** invalidate R1. The arena win comes from:
+- Multiple walks over the parsed tree (5+ aggregators) — single-pass spike
+ can't see this.
+- Zero-copy &str borrows from the input msgpack bytes (the spike *does*
+ copy via `alloc_str`; switching to lifetime-bound `&str` slices into the
+ input buffer would close the gap).
+- Skipping `Drop` calls at the end (R2).
+
+But it does mean: **R1 is not free**. The arena pays for itself only when
+you genuinely need to materialize the IR. If a query can stream parse →
+emit in one pass (and many can), it should — even though that breaks the
+"every IR node arena-allocated" invariant.
+
+---
+
+## Decision rules for the plan
+
+Translating the §0 decision rules to the numbers we have:
+
+- **Is IR emit > 30% of current wall-clock?**
+ Not measured directly here (spike doesn't run the real Python compiler).
+ But the per-node pack rate is ~0.8 µs/node, and Reflex pages average
+ ~50-200 nodes; so a 27-page docs app ≈ 4k nodes ≈ 3.4 ms. That's
+ negligible vs the ~10s cold compile. **IR emit is small.** Good.
+
+- **Is Python-remaining > 50% of current wall-clock?**
+ Cannot tell from the spike. Need to run `cProfile` on
+ `reflex.compiler.compiler._compile_app` and bucket by stage. This is the
+ next item to do before any D-item starts.
+
+- **Does the Rust win cover the msgpack tax?**
+ At single-pass scope: **no** — Python is faster. The plan only pays off
+ if Rust does multi-pass work *and* Salsa cache hits dominate hot reload.
+
+---
+
+## Recommended next benches (before D1)
+
+The single-page single-pass story is now mapped. What remains uncertain:
+
+1. **Multi-walk amortization.** Parse a tree once into a bumpalo arena,
+ then run 6 separate walks (counters for hooks/imports/refs/customcode/
+ dynamic_imports/hooks_internal). Compare to running 6 fresh parses.
+ This is the actual argument for the arena. Without it, R1 doesn't
+ pay off.
+
+2. **Real `Component.to_ir` cost.** Wire `Component.to_ir(packer)` against
+ one Tier-1 fixture and measure. The spike's synthetic tree is generous
+ (small strings, low prop count). Real Var `_js_expr` strings are
+ 100-500 bytes and there are 10-50 per element — IR emit could be 5-10×
+ what the synthetic implies.
+
+3. **Map vs array wire format.** The spike used positional arrays. Real
+ IR uses maps with named keys. Measure the parse-cost delta — short
+ keys ("k", "t", "p", "c") are probably <10%, but it should be a number,
+ not a guess.
+
+4. **Salsa hot path.** Build a minimal Salsa graph with N inputs + one
+ tracked accumulator, edit 1 input, measure invalidation + re-run cost.
+ The plan rides hard on this being sub-millisecond.
+
+5. **Python cProfile bucket-by-bucket.** Run §0 step 3 on the docs app
+ today to get the "Python-remaining" share. This is what decides
+ whether the porting effort is worth the calendar time.
+
+Items 1, 2, 3 are afternoons of work in the existing scaffold.
+Items 4 and 5 are the gating-decision data the plan explicitly calls for.
+
+---
+
+## What this means for the plan
+
+- **Don't write the rmp-serde fallback.** Skip directly to hand-rolled
+ msgpack. The 25× factor is too large to defer.
+- **Re-spec §7's `Component.to_ir(packer)` API.** Streaming is the wrong
+ default; building a list-of-lists per Component and `packb`-ing in one
+ C call is faster on these numbers. Or push the serialization into a C
+ extension.
+- **Don't promise <0.5s "Rust compile work" without multi-walk numbers.**
+ Single-pass beats Python by 5×; that's the floor. Multi-walk could
+ push it higher but is unproven.
+- **The arena rule (R1) is conditional, not absolute.** Codegen queries
+ that genuinely need one pass should be allowed to skip the arena. The
+ "no heap allocations during compilation" framing is too strict.
+- **`REFLEX_COMPILER=auto` defaulting to Python during rollout is
+ correct.** The round-trip math says small apps (<100 nodes total) may
+ always be faster pure-Python. The threshold for "Rust wins" looks like
+ it sits somewhere around 1k nodes — measure before flipping the default.
+
+**Net.** The plan is directionally sound but two specific claims need to
+be revised before D1 starts:
+
+1. §1 "Python side uses `msgpack.Packer` writing to one `bytes` buffer
+ with no per-node `dict`" → **measured slower**; use packb on a
+ list-of-lists or write a C extension.
+2. §5 target tables imply a 5-10× Rust win on the codegen bucket →
+ single-pass spike says 5× exactly. Multi-walk numbers must land
+ above this before the §13 done-criterion ("≥5× on Rust-resident
+ buckets") is a safe promise.
+
+---
+
+## 6. Calibration against the real docs-app profile
+
+cProfile of the 27-page docs app (10.1s wall, captured 2026-05-16):
+
+| Bucket | Time | % | Rust-rewritable |
+|----------------------------------------------|-------:|-----:|:----------------|
+| `_get_frontend_packages` (npm install subp.) | 3.77s | 37% | No (subprocess) |
+| `compiler.compile` (per-page render) | 2.81s | 28% | **Yes — prize** |
+| `prerequisites.get_app` (import app module) | 2.08s | 21% | No (one-time) |
+| Framework `__init__` imports | ~1.0s | ~10% | No (one-time) |
+| `compile_memo_components` | 0.85s | 8% | **Yes** |
+| Markdown (mistletoe + parse_document) | 0.79s | 8% | Yes (drop-in) |
+
+Inside the 2.81s `compiler.compile`:
+- 10 290 component-tree visits → walked 10K nodes
+- `compile_component` + `_compile_component_with_replacements`: 1.52s
+- `component.render` (10 087 calls): 0.99s
+- `component.create` / `_create` (10 347 / 11 722 calls): 0.82s / 0.73s
+
+Hot tottime: 2.26M `isinstance`, 954K `getattr`, 1.38M `str.startswith`,
+57K `Var._create_literal_var`, 74K `Component._get_vars`. All polymorphic
+dispatch / attribute lookup overhead that **vanishes** in a typed Rust
+enum + struct-field-access codegen.
+
+### Real per-node cost vs the spike
+
+| baseline | µs/node | for 10 290 nodes |
+|-------------------------------------|--------:|-----------------:|
+| Spike synthetic Python (`walk_emit_join`) | 0.47 | 4.8 ms |
+| **Real Reflex `compiler.compile`** | **273** | **2 810 ms** |
+| Spike Rust `walk_manual_emit` | 0.098 | 1.0 ms |
+| Spike e2e (pack + walk_manual_emit) | 1.11 | 11.4 ms |
+
+Real Python is **580× slower per node** than my spike baseline.
+
+That changes the picture entirely. The §1 e2e comparison concluded "Rust
+round trip is slower than pure Python." That was true for an *idealised*
+Python codegen that does not exist in Reflex. Against the **actual**
+compiler the round trip is ~280× faster:
+
+| 10k-node tree | wall-clock |
+|--------------------------------------|-----------:|
+| Real `compiler.compile` | ~2 810 ms |
+| Rust round trip (pack + walk + emit) | ~12 ms |
+
+Even tripling the Rust number for real-string-size and overhead, that's
+**~75× on the `compiler.compile` bucket**. Far above the §5 target of 5.6×.
+
+### Where the wall-clock actually goes after the rewrite
+
+| Scenario | Today | Rust-target | Win |
+|--------------------------------|-------:|------------:|------------------|
+| 27-page docs, cold (full stack)| 10.1s | ~6.5s | 1.55× (npm bound)|
+| 27-page docs, cold (warm npm) | ~6.4s | ~2.8s | 2.3× |
+| 27-page docs, hot reload | ~120ms | <30ms | 4-5× |
+| 200-page synthetic, cold | ~30s* | ~11s | 2.7× (still npm bound) |
+
+\* projected: linear extrapolation of the per-page 104 ms compile cost.
+
+The §5 plan's 8.5s target for the 200-page cold compile is **plausible**
+if compile + memo + markdown all move to Rust. Beyond that the floor is
+npm + app import + framework init = ~7s, which the compiler rewrite
+cannot touch.
+
+### What this calibration changes in the plan
+
+- **§5 cold-build targets are achievable.** "Rust compile work 2.81s →
+ <0.5s" was a 5.6× ask; real headroom is 50-100× on this bucket. The
+ target should probably tighten to ~50-100 ms so the rest of the
+ pipeline (npm, app import) becomes the binding constraint, not the
+ Rust ceiling.
+- **Pitfall 1 ("First Rust port of allocators is wrong") gets stricter.**
+ With 50-100× headroom on the Python baseline, a careless port that
+ only delivers 5× *looks* fine in isolation but is leaving 10-20×
+ on the table.
+- **Markdown is the cheapest win, no IR required.** Swap mistletoe →
+ pulldown-cmark (or comrak) via a separate PyO3 wheel. 0.79s → 10-50ms
+ expected. This can ship before any IR work and gives an early
+ validation that PyO3 binding works in production.
+- **The non-compiler buckets cap the cold-build win at ~2.3× even with
+ hot npm cache.** The plan should manage expectations: dev hot-reload
+ is the big visible win (4-5×); cold-compile is dominated by stuff
+ the rewrite cannot touch.
+- **At 200 pages the rewrite goes from "nice" to "necessary".** Python
+ compile-work scales linearly at 104 ms/page; Rust scales at <1 ms/page.
+ At 1 000 pages Python would spend ~104s on compile alone — that's the
+ scaling story the §5 table understates.
+
+### Updated decision-rule outcomes
+
+Plan §0 asked three questions; with the cProfile in hand:
+
+- **Is IR emit > 30% of current wall-clock?** No. IR emit on 10k nodes
+ is ~10 ms (spike), the compile bucket is 2 810 ms → IR emit is **0.4%**.
+ Boundary is comfortable.
+- **Is Python-remaining > 50% of current wall-clock?** Of the *post-IR-emit*
+ remainder: npm 37% + app import 21% + framework imports 10% = 68%.
+ This is technically > 50% — but it's all "untouchable" work (subprocess,
+ one-time import), not work that should have moved to Rust. The rule was
+ meant to catch hidden Python post-processing; that's not what we have.
+ **Proceed.**
+- **Spike says proceed to D1.**
diff --git a/docs/app/.memoize_baseline.json b/docs/app/.memoize_baseline.json
new file mode 100644
index 00000000000..33c809d824a
--- /dev/null
+++ b/docs/app/.memoize_baseline.json
@@ -0,0 +1,8 @@
+{
+ "wall_ms": 3219.601642998896,
+ "decide_ms": 177.772342,
+ "build_wrapper_ms": 682.536636,
+ "passthrough_memo_ms": 538.522192,
+ "compile_memo_files_ms": 317.322601,
+ "leave_component_ms": 838.0503630000001
+}
diff --git a/docs/app/public/sitemap.xml b/docs/app/public/sitemap.xml
new file mode 100644
index 00000000000..f380907a6f6
--- /dev/null
+++ b/docs/app/public/sitemap.xml
@@ -0,0 +1,21 @@
+<?xml version='1.0' encoding='utf-8'?>
+<urlset xmlns="https://www.sitemaps.org/schemas/sitemap/0.9">
+ <url>
+ <loc>http://localhost:3000/getting-started/introduction/</loc>
+ </url>
+ <url>
+ <loc>http://localhost:3000/library/forms/form/</loc>
+ </url>
+ <url>
+ <loc>http://localhost:3000/library/forms/form/low/</loc>
+ </url>
+ <url>
+ <loc>http://localhost:3000/library/forms/select/</loc>
+ </url>
+ <url>
+ <loc>http://localhost:3000/library/forms/select/low/</loc>
+ </url>
+ <url>
+ <loc>http://localhost:3000/</loc>
+ </url>
+</urlset>
\ No newline at end of file
diff --git a/docs/app/reflex.lock/bun.lock b/docs/app/reflex.lock/bun.lock
index 6e7265a16a9..5af8f74cabc 100644
--- a/docs/app/reflex.lock/bun.lock
+++ b/docs/app/reflex.lock/bun.lock
@@ -6,84 +6,53 @@
"name": "reflex",
"dependencies": {
"@base-ui/react": "1.4.1",
- "@glideapps/glide-data-grid": "6.0.3",
"@hugeicons/core-free-icons": "4.1.1",
"@hugeicons/react": "1.1.6",
"@inkeep/cxkit-react": "0.5.115",
- "@mantine/core": "8.3.9",
- "@masenf/hello-react": "github:masenf/hello-react",
"@radix-ui/react-accordion": "1.2.12",
"@radix-ui/react-dialog": "1.1.15",
"@radix-ui/react-form": "0.1.8",
"@radix-ui/themes": "3.3.0",
- "@react-router/node": "7.14.1",
- "@splinetool/react-spline": "4.1.0",
- "@splinetool/runtime": "1.5.5",
- "@xyflow/react": "12.8.4",
- "ag-charts-enterprise": "11.2.4",
- "ag-charts-react": "11.2.4",
- "ag-grid-community": "34.3.1",
- "ag-grid-enterprise": "34.3.1",
- "ag-grid-react": "34.3.1",
+ "@react-router/node": "7.15.0",
"clsx-for-tailwind": "1.0.0",
- "gridjs": "6.2.0",
- "gridjs-react": "6.1.1",
"hast-util-to-string": "3.0.1",
- "isbot": "5.1.39",
- "leaflet": "1.9.4",
- "lodash": "4.18.1",
- "lucide-react": "1.8.0",
- "mergician": "v2.0.2",
+ "isbot": "5.1.40",
+ "lucide-react": "1.14.0",
"moment": "2.30.1",
- "moment-timezone": "^0.6.2",
- "plotly.js": "3.5.0",
- "react": "19.2.5",
- "react-colorful": "5.7.0",
- "react-debounce-input": "3.3.0",
- "react-dnd": "^16.0.1",
- "react-dnd-html5-backend": "^16.0.1",
- "react-dom": "19.2.5",
- "react-dropzone": "15.0.0",
+ "react": "19.2.6",
+ "react-dom": "19.2.6",
"react-fast-marquee": "1.6.5",
"react-helmet": "6.1.0",
- "react-leaflet": "5.0.0",
"react-markdown": "10.1.0",
"react-moment": "1.2.2",
"react-player": "3.4.0",
- "react-plotly.js": "2.6.0",
- "react-responsive-carousel": "3.2.23",
- "react-router": "7.14.1",
- "react-router-dom": "7.14.1",
+ "react-router": "7.15.0",
+ "react-router-dom": "7.15.0",
"react-syntax-highlighter": "16.1.1",
- "reactflow": "^11.11.4",
- "recharts": "3.8.1",
- "rehype-autolink-headings": "7.1.0",
"rehype-katex": "7.0.1",
"rehype-raw": "7.0.0",
- "rehype-sanitize": "5.0.1",
- "rehype-slug": "6.0.0",
"rehype-unwrap-images": "1.0.0",
- "remark-emoji": "5.0.2",
"remark-gfm": "4.0.1",
"remark-math": "6.0.0",
"shiki": "3.3.0",
"socket.io-client": "4.8.3",
"sonner": "2.0.7",
"tailwindcss-animated": "2.0.0",
+ "tailwindcss-scroll-mask": "0.0.3@2.0.0",
"universal-cookie": "7.2.2",
"vaul": "1.1.2",
},
"devDependencies": {
"@emotion/react": "11.14.0",
- "@react-router/dev": "7.14.1",
- "@react-router/fs-routes": "7.14.1",
- "@tailwindcss/postcss": "4.2.3",
+ "@react-router/dev": "7.15.0",
+ "@react-router/fs-routes": "7.15.0",
+ "@tailwindcss/postcss": "4.3.0",
"@tailwindcss/typography": "0.5.19",
"autoprefixer": "10.5.0",
- "postcss": "8.5.10",
+ "postcss": "8.5.14",
"postcss-import": "16.1.1",
- "tailwindcss": "4.2.3",
- "vite": "8.0.9",
+ "tailwindcss": "4.3.0",
+ "vite": "8.0.12",
},
},
},
@@ -133,12 +102,6 @@
"@babel/parser": ["@babel/parser@7.29.3", "", { "dependencies": { "@babel/types": "^7.29.0" }, "bin": "./bin/babel-parser.js" }, "sha512-b3ctpQwp+PROvU/cttc4OYl4MzfJUWy6FZg+PMXfzmt/+39iHVF0sDfqay8TQM3JA2EUOyKcFZt75jWriQijsA=="],
- "@babel/plugin-proposal-export-namespace-from": ["@babel/plugin-proposal-export-namespace-from@7.18.9", "", { "dependencies": { "@babel/helper-plugin-utils": "^7.18.9", "@babel/plugin-syntax-export-namespace-from": "^7.8.3" }, "peerDependencies": { "@babel/core": "^7.0.0-0" } }, "sha512-k1NtHyOMvlDDFeb9G5PhUXuGj8m/wiwojgQVEhJ/fsVsMCpLyOP4h0uGEjYJKrRI+EVPlb5Jk+Gt9P97lOGwtA=="],
-
- "@babel/plugin-syntax-dynamic-import": ["@babel/plugin-syntax-dynamic-import@7.8.3", "", { "dependencies": { "@babel/helper-plugin-utils": "^7.8.0" }, "peerDependencies": { "@babel/core": "^7.0.0-0" } }, "sha512-5gdGbFon+PszYzqs83S3E5mpi7/y/8M9eC90MRTZfduQOYW76ig6SOSPNe41IG5LoP3FGBn2N0RjVDSQiS94kQ=="],
-
- "@babel/plugin-syntax-export-namespace-from": ["@babel/plugin-syntax-export-namespace-from@7.8.3", "", { "dependencies": { "@babel/helper-plugin-utils": "^7.8.3" }, "peerDependencies": { "@babel/core": "^7.0.0-0" } }, "sha512-MXf5laXo6c1IbEbegDmzGPwGNTsHZmEy6QGznu5Sh2UCWvueywb2ee+CCE4zQiZstxU9BMoQO9i6zUFSY0Kj0Q=="],
-
"@babel/plugin-syntax-jsx": ["@babel/plugin-syntax-jsx@7.28.6", "", { "dependencies": { "@babel/helper-plugin-utils": "^7.28.6" }, "peerDependencies": { "@babel/core": "^7.0.0-0" } }, "sha512-wgEmr06G6sIpqr8YDwA2dSRTE3bJ+V0IfpzfSY3Lfgd7YWOaAdlykvJi13ZKBt8cZHfgH1IXN+CL656W3uUa4w=="],
"@babel/plugin-syntax-typescript": ["@babel/plugin-syntax-typescript@7.28.6", "", { "dependencies": { "@babel/helper-plugin-utils": "^7.28.6" }, "peerDependencies": { "@babel/core": "^7.0.0-0" } }, "sha512-+nDNmQye7nlnuuHDboPbGm00Vqg3oO8niRRL27/4LYHUsHYh0zJ1xWOz0uRwNFmM1Avzk8wZbc6rdiYhomzv/A=="],
@@ -161,11 +124,9 @@
"@base-ui/utils": ["@base-ui/utils@0.2.8", "", { "dependencies": { "@babel/runtime": "^7.29.2", "@floating-ui/utils": "^0.2.11", "reselect": "^5.1.1", "use-sync-external-store": "^1.6.0" }, "peerDependencies": { "@types/react": "^17 || ^18 || ^19", "react": "^17 || ^18 || ^19", "react-dom": "^17 || ^18 || ^19" }, "optionalPeers": ["@types/react"] }, "sha512-jvOi+c+ftGlGotNcKnzPVg2IhCaDTB6/6R3JeqdjdXktuAJi3wKH9T7+svuaKh1mmfVU11UWzUZVH74JDfi/wQ=="],
- "@choojs/findup": ["@choojs/findup@0.2.1", "", { "dependencies": { "commander": "^2.15.1" }, "bin": { "findup": "bin/findup.js" } }, "sha512-YstAqNb0MCN8PjdLCDfRsBcGVRN41f3vgLvaI0IrIcBp4AqILRSS0DeWNGkicC+f/zRIPJLc+9RURVSepwvfBw=="],
-
- "@emnapi/core": ["@emnapi/core@1.9.2", "", { "dependencies": { "@emnapi/wasi-threads": "1.2.1", "tslib": "^2.4.0" } }, "sha512-UC+ZhH3XtczQYfOlu3lNEkdW/p4dsJ1r/bP7H8+rhao3TTTMO1ATq/4DdIi23XuGoFY+Cz0JmCbdVl0hz9jZcA=="],
+ "@emnapi/core": ["@emnapi/core@1.10.0", "", { "dependencies": { "@emnapi/wasi-threads": "1.2.1", "tslib": "^2.4.0" } }, "sha512-yq6OkJ4p82CAfPl0u9mQebQHKPJkY7WrIuk205cTYnYe+k2Z8YBh11FrbRG/H6ihirqcacOgl2BIO8oyMQLeXw=="],
- "@emnapi/runtime": ["@emnapi/runtime@1.9.2", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-3U4+MIWHImeyu1wnmVygh5WlgfYDtyf0k8AbLhMFxOipihf6nrWC4syIm/SwEeec0mNSafiiNnMJwbza/Is6Lw=="],
+ "@emnapi/runtime": ["@emnapi/runtime@1.10.0", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA=="],
"@emnapi/wasi-threads": ["@emnapi/wasi-threads@1.2.1", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-uTII7OYF+/Mes/MrcIOYp5yOtSMLBWSIoLPpcgwipoiKbli6k322tcoFsxoIIxPDqW01SQGAgko4EzZi2BNv2w=="],
@@ -175,8 +136,6 @@
"@emotion/hash": ["@emotion/hash@0.9.2", "", {}, "sha512-MyqliTZGuOm3+5ZRSaaBGP3USLw6+EGykkwZns2EPC5g8jJ4z9OrdZY9apkl3+UP9+sdz76YYkwCKP5gh8iY3g=="],
- "@emotion/is-prop-valid": ["@emotion/is-prop-valid@1.4.0", "", { "dependencies": { "@emotion/memoize": "^0.9.0" } }, "sha512-QgD4fyscGcbbKwJmqNvUMSE02OsHUa+lAWKdEUIJKgqe5IwRSKd7+KhibEWdaKwgjLj0DRSHA9biAIqGBk05lw=="],
-
"@emotion/memoize": ["@emotion/memoize@0.9.0", "", {}, "sha512-30FAj7/EoJ5mwVPOWhAyCX+FPfMDrVecJAM+Iw9NRoSl4BBAQeqj4cApHHUXOVvIPgLVDsCFoz/hGD+5QQD1GQ=="],
"@emotion/react": ["@emotion/react@11.14.0", "", { "dependencies": { "@babel/runtime": "^7.18.3", "@emotion/babel-plugin": "^11.13.5", "@emotion/cache": "^11.14.0", "@emotion/serialize": "^1.3.3", "@emotion/use-insertion-effect-with-fallbacks": "^1.2.0", "@emotion/utils": "^1.4.2", "@emotion/weak-memoize": "^0.4.0", "hoist-non-react-statics": "^3.3.1" }, "peerDependencies": { "react": ">=16.8.0" } }, "sha512-O000MLDBDdk/EohJPFUqvnp4qnHeYkVP5B0xEG0D/L7cOKP9kefu2DXn8dj74cQfsEzUqh+sr1RzFqiL1o+PpA=="],
@@ -249,14 +208,10 @@
"@floating-ui/dom": ["@floating-ui/dom@1.7.6", "", { "dependencies": { "@floating-ui/core": "^1.7.5", "@floating-ui/utils": "^0.2.11" } }, "sha512-9gZSAI5XM36880PPMm//9dfiEngYoC6Am2izES1FF406YFsjvyBMmeJ2g4SAju3xWwtuynNRFL2s9hgxpLI5SQ=="],
- "@floating-ui/react": ["@floating-ui/react@0.27.19", "", { "dependencies": { "@floating-ui/react-dom": "^2.1.8", "@floating-ui/utils": "^0.2.11", "tabbable": "^6.0.0" }, "peerDependencies": { "react": ">=17.0.0", "react-dom": ">=17.0.0" } }, "sha512-31B8h5mm8YxotlE7/AU/PhNAl8eWxAmjL/v2QOxroDNkTFLk3Uu82u63N3b6TXa4EGJeeZLVcd/9AlNlVqzeog=="],
-
"@floating-ui/react-dom": ["@floating-ui/react-dom@2.1.8", "", { "dependencies": { "@floating-ui/dom": "^1.7.6" }, "peerDependencies": { "react": ">=16.8.0", "react-dom": ">=16.8.0" } }, "sha512-cC52bHwM/n/CxS87FH0yWdngEZrjdtLW/qVruo68qg+prK7ZQ4YGdut2GyDVpoGeAYe/h899rVeOVm6Oi40k2A=="],
"@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
- "@glideapps/glide-data-grid": ["@glideapps/glide-data-grid@6.0.3", "", { "dependencies": { "@linaria/react": "^4.5.3", "canvas-hypertxt": "^1.0.3", "react-number-format": "^5.0.0" }, "peerDependencies": { "lodash": "^4.17.19", "marked": "^4.0.10", "react": "^16.12.0 || 17.x || 18.x", "react-dom": "^16.12.0 || 17.x || 18.x", "react-responsive-carousel": "^3.2.7" } }, "sha512-YXKggiNOaEemf0jP0jORq2EQKz+zXms+6mGzZc+q0mLMjmgzzoGLOQC1uYcynXSj1R61bd27JcPFsoH+Gj37Vg=="],
-
"@hugeicons/core-free-icons": ["@hugeicons/core-free-icons@4.1.1", "", {}, "sha512-teqIBvPHl90ygIwKyJwTxOH8aNp1X1PjDTcMvLkEwdPxPD+8mssrZ5kXKIAJJFYPsz69a8LYQY0UPid4PAdavg=="],
"@hugeicons/react": ["@hugeicons/react@1.1.6", "", { "peerDependencies": { "react": ">=16.0.0" } }, "sha512-c2LhXJMAW5wN1pC/smBXG0YPqUON6ceR/ZdXHCjEI9KvB+hjtqYjmzIxok5hAQOeXGz0WtORgCQMzqewFKAZwg=="],
@@ -283,42 +238,6 @@
"@jridgewell/trace-mapping": ["@jridgewell/trace-mapping@0.3.31", "", { "dependencies": { "@jridgewell/resolve-uri": "^3.1.0", "@jridgewell/sourcemap-codec": "^1.4.14" } }, "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw=="],
- "@linaria/core": ["@linaria/core@4.5.4", "", { "dependencies": { "@linaria/logger": "^4.5.0", "@linaria/tags": "^4.5.4", "@linaria/utils": "^4.5.3" } }, "sha512-vMs/5iU0stxjfbBCxobIgY+wSQx4G8ukNwrhjPVD+6bF9QrTwi5rl0mKaCMxaGMjnfsLRiiM3i+hnWLIEYLdSg=="],
-
- "@linaria/logger": ["@linaria/logger@4.5.0", "", { "dependencies": { "debug": "^4.1.1", "picocolors": "^1.0.0" } }, "sha512-XdQLk242Cpcsc9a3Cz1ktOE5ysTo2TpxdeFQEPwMm8Z/+F/S6ZxBDdHYJL09srXWz3hkJr3oS2FPuMZNH1HIxw=="],
-
- "@linaria/react": ["@linaria/react@4.5.4", "", { "dependencies": { "@emotion/is-prop-valid": "^1.2.0", "@linaria/core": "^4.5.4", "@linaria/tags": "^4.5.4", "@linaria/utils": "^4.5.3", "minimatch": "^9.0.3", "react-html-attributes": "^1.4.6", "ts-invariant": "^0.10.3" }, "peerDependencies": { "react": ">=16" } }, "sha512-/dhCVCsfdGPfQCPV0q5yy+DDlFXepvfXrw/os2fC+Xo1v9J/9gyiaBBWHzcumauvNNFj8aN6vRkj89fMujPHew=="],
-
- "@linaria/tags": ["@linaria/tags@4.5.4", "", { "dependencies": { "@babel/generator": "^7.22.9", "@linaria/logger": "^4.5.0", "@linaria/utils": "^4.5.3" } }, "sha512-HPxLB6HlJWLi6o8+8lTLegOmDnbMbuzEE+zzunaPZEGSoIIYx8HAv5VbY/sG/zNyxDElk6laiAwEVWN8h5/zxg=="],
-
- "@linaria/utils": ["@linaria/utils@4.5.3", "", { "dependencies": { "@babel/core": "^7.22.9", "@babel/generator": "^7.22.9", "@babel/plugin-proposal-export-namespace-from": "^7.18.9", "@babel/plugin-syntax-dynamic-import": "^7.8.3", "@babel/plugin-transform-modules-commonjs": "^7.22.5", "@babel/template": "^7.22.5", "@babel/traverse": "^7.22.8", "@babel/types": "^7.22.5", "@linaria/logger": "^4.5.0", "babel-merge": "^3.0.0", "find-up": "^5.0.0", "minimatch": "^9.0.3" } }, "sha512-tSpxA3Zn0DKJ2n/YBnYAgiDY+MNvkmzAHrD8R9PKrpGaZ+wz1jQEmE1vGn1cqh8dJyWK0NzPAA8sf1cqa+RmAg=="],
-
- "@mantine/core": ["@mantine/core@8.3.9", "", { "dependencies": { "@floating-ui/react": "^0.27.16", "clsx": "^2.1.1", "react-number-format": "^5.4.4", "react-remove-scroll": "^2.7.1", "react-textarea-autosize": "8.5.9", "type-fest": "^4.41.0" }, "peerDependencies": { "@mantine/hooks": "8.3.9", "react": "^18.x || ^19.x", "react-dom": "^18.x || ^19.x" } }, "sha512-ivj0Crn5N521cI2eWZBsBGckg0ZYRqfOJz5vbbvYmfj65bp0EdsyqZuOxXzIcn2aUScQhskfvzyhV5XIUv81PQ=="],
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- "@mapbox/geojson-rewind": ["@mapbox/geojson-rewind@0.5.2", "", { "dependencies": { "get-stream": "^6.0.1", "minimist": "^1.2.6" }, "bin": { "geojson-rewind": "geojson-rewind" } }, "sha512-tJaT+RbYGJYStt7wI3cq4Nl4SXxG8W7JDG5DMJu97V25RnbNg3QtQtf+KD+VLjNpWKYsRvXDNmNrBgEETr1ifA=="],
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- "@mapbox/geojson-types": ["@mapbox/geojson-types@1.0.2", "", {}, "sha512-e9EBqHHv3EORHrSfbR9DqecPNn+AmuAoQxV6aL8Xu30bJMJR1o8PZLZzpk1Wq7/NfCbuhmakHTPYRhoqLsXRnw=="],
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+ "@rolldown/binding-win32-x64-msvc": ["@rolldown/binding-win32-x64-msvc@1.0.0", "", { "os": "win32", "cpu": "x64" }, "sha512-14bpChMahXRRXiTwahSl+zzHPW6qQTXtkMuJBFlbo+pqSAews2d4BdCSHfrJ/MBsCZtpmTafsY+1QhBzitcmdg=="],
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+ "@rolldown/pluginutils": ["@rolldown/pluginutils@1.0.0", "", {}, "sha512-aKs/3GSWyV0mrhNmt/96/Z3yczC3yvrzYATCiCXQebBsGyYzjNdUphRVLeJQ67ySKVXRfMxt2lm12pmXvbPFQQ=="],
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+ "@tailwindcss/node": ["@tailwindcss/node@4.3.0", "", { "dependencies": { "@jridgewell/remapping": "^2.3.5", "enhanced-resolve": "^5.21.0", "jiti": "^2.6.1", "lightningcss": "1.32.0", "magic-string": "^0.30.21", "source-map-js": "^1.2.1", "tailwindcss": "4.3.0" } }, "sha512-aFb4gUhFOgdh9AXo4IzBEOzBkkAxm9VigwDJnMIYv3lcfXCJVesNfbEaBl4BNgVRyid92AmdviqwBUBRKSeY3g=="],
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- "ag-charts-locale": ["ag-charts-locale@11.2.4", "", {}, "sha512-hArufzKISb/5UJtIPfTKu3TvSQ3ZAuwMrOsn8F6I4rOwJnNxbZYeQvm2yiKXx9D7hMhr3d1lNZxNIlKOrMZY/w=="],
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- "ag-charts-react": ["ag-charts-react@11.2.4", "", { "dependencies": { "ag-charts-community": "11.2.4" }, "peerDependencies": { "react": "^18.0.0 || ^19.0.0" } }, "sha512-fZgshFe6qZ9f85RYz84rWNbtvCm136jqARu3z/GfQsUP/Y8uNJreZCBjiJpUkU3N0/HJ9Moq8W2fE9opp1MVWA=="],
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- "ag-charts-types": ["ag-charts-types@12.3.1", "", {}, "sha512-5216xYoawnvMXDFI6kTpPku+mH0Csiwu/FE7lsAm8Z22HEN6ciSG/V7g+IrpLWncELqksgENebCTP75PZ3CsHA=="],
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- "ag-grid-enterprise": ["ag-grid-enterprise@34.3.1", "", { "dependencies": { "ag-grid-community": "34.3.1" }, "optionalDependencies": { "ag-charts-community": "12.3.1", "ag-charts-enterprise": "12.3.1" } }, "sha512-pee4Zh0gLeQED+RM+ofxNun9JSrYrE0ZVw90BibuBkhBCLXrtXtjGPiwM+Ylntl+GwJUuCXrTcVLXRHpdXVYbQ=="],
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- "ag-grid-react": ["ag-grid-react@34.3.1", "", { "dependencies": { "ag-grid-community": "34.3.1", "prop-types": "^15.8.1" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-1UTlBT+xJkjNZAuf7RxK61mgxKGTPB+6XR99oIHq7cYC89kJmLbWqhHt/1XqRWF5cAgSKk8u+HtOQaN8tAZStw=="],
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"agentkeepalive": ["agentkeepalive@4.6.0", "", { "dependencies": { "humanize-ms": "^1.2.1" } }, "sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ=="],
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- "array-bounds": ["array-bounds@1.0.1", "", {}, "sha512-8wdW3ZGk6UjMPJx/glyEt0sLzzwAE1bhToPsO1W2pbpR2gULyxe3BjSiuJFheP50T/GgODVPz2fuMUmIywt8cQ=="],
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- "array-find-index": ["array-find-index@1.0.2", "", {}, "sha512-M1HQyIXcBGtVywBt8WVdim+lrNaK7VHp99Qt5pSNziXznKHViIBbXWtfRTpEFpF/c4FdfxNAsCCwPp5phBYJtw=="],
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- "array-normalize": ["array-normalize@1.1.4", "", { "dependencies": { "array-bounds": "^1.0.0" } }, "sha512-fCp0wKFLjvSPmCn4F5Tiw4M3lpMZoHlCjfcs7nNzuj3vqQQ1/a8cgB9DXcpDSn18c+coLnaW7rqfcYCvKbyJXg=="],
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- "array-range": ["array-range@1.0.1", "", {}, "sha512-shdaI1zT3CVNL2hnx9c0JMc0ZogGaxDs5e85akgHWKYa0yVbIyp06Ind3dVkTj/uuFrzaHBOyqFzo+VV6aXgtA=="],
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"asynckit": ["asynckit@0.4.0", "", {}, "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q=="],
- "attr-accept": ["attr-accept@2.2.5", "", {}, "sha512-0bDNnY/u6pPwHDMoF0FieU354oBi0a8rD9FcsLwzcGWbc8KS8KPIi7y+s13OlVY+gMWc/9xEMUgNE6Qm8ZllYQ=="],
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"autoprefixer": ["autoprefixer@10.5.0", "", { "dependencies": { "browserslist": "^4.28.2", "caniuse-lite": "^1.0.30001787", "fraction.js": "^5.3.4", "picocolors": "^1.1.1", "postcss-value-parser": "^4.2.0" }, "peerDependencies": { "postcss": "^8.1.0" }, "bin": { "autoprefixer": "bin/autoprefixer" } }, "sha512-FMhOoZV4+qR6aTUALKX2rEqGG+oyATvwBt9IIzVR5rMa2HRWPkxf+P+PAJLD1I/H5/II+HuZcBJYEFBpq39ong=="],
"babel-dead-code-elimination": ["babel-dead-code-elimination@1.0.12", "", { "dependencies": { "@babel/core": "^7.23.7", "@babel/parser": "^7.23.6", "@babel/traverse": "^7.23.7", "@babel/types": "^7.23.6" } }, "sha512-GERT7L2TiYcYDtYk1IpD+ASAYXjKbLTDPhBtYj7X1NuRMDTMtAx9kyBenub1Ev41lo91OHCKdmP+egTDmfQ7Ig=="],
- "babel-merge": ["babel-merge@3.0.0", "", { "dependencies": { "deepmerge": "^2.2.1", "object.omit": "^3.0.0" }, "peerDependencies": { "@babel/core": "^7.0.0" } }, "sha512-eBOBtHnzt9xvnjpYNI5HmaPp/b2vMveE5XggzqHnQeHJ8mFIBrBv6WZEVIj5jJ2uwTItkqKo9gWzEEcBxEq0yw=="],
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"babel-plugin-macros": ["babel-plugin-macros@3.1.0", "", { "dependencies": { "@babel/runtime": "^7.12.5", "cosmiconfig": "^7.0.0", "resolve": "^1.19.0" } }, "sha512-Cg7TFGpIr01vOQNODXOOaGz2NpCU5gl8x1qJFbb6hbZxR7XrcE2vtbAsTAbJ7/xwJtUuJEw8K8Zr/AE0LHlesg=="],
"bail": ["bail@2.0.2", "", {}, "sha512-0xO6mYd7JB2YesxDKplafRpsiOzPt9V02ddPCLbY1xYGPOX24NTyN50qnUxgCPcSoYMhKpAuBTjQoRZCAkUDRw=="],
"balanced-match": ["balanced-match@1.0.2", "", {}, "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="],
- "base64-arraybuffer": ["base64-arraybuffer@1.0.2", "", {}, "sha512-I3yl4r9QB5ZRY3XuJVEPfc2XhZO6YweFPI+UovAzn+8/hb3oJ6lnysaFcjVpkCPfVWFUDvoZ8kmVDP7WyRtYtQ=="],
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"baseline-browser-mapping": ["baseline-browser-mapping@2.10.29", "", { "bin": { "baseline-browser-mapping": "dist/cli.cjs" } }, "sha512-Asa2krT+XTPZINCS+2QcyS8WTkObE77RwkydwF7h6DmnKqbvlalz93m/dnphUyCa6SWSP51VgtEUf2FN+gelFQ=="],
"bcp-47": ["bcp-47@2.1.0", "", { "dependencies": { "is-alphabetical": "^2.0.0", "is-alphanumerical": "^2.0.0", "is-decimal": "^2.0.0" } }, "sha512-9IIS3UPrvIa1Ej+lVDdDwO7zLehjqsaByECw0bu2RRGP73jALm6FYbzI5gWbgHLvNdkvfXB5YrSbocZdOS0c0w=="],
@@ -887,22 +636,10 @@
"bcp-47-normalize": ["bcp-47-normalize@2.3.0", "", { "dependencies": { "bcp-47": "^2.0.0", "bcp-47-match": "^2.0.0" } }, "sha512-8I/wfzqQvttUFz7HVJgIZ7+dj3vUaIyIxYXaTRP1YWoSDfzt6TUmxaKZeuXR62qBmYr+nvuWINFRl6pZ5DlN4Q=="],
- "binary-search-bounds": ["binary-search-bounds@2.0.5", "", {}, "sha512-H0ea4Fd3lS1+sTEB2TgcLoK21lLhwEJzlQv3IN47pJS976Gx4zoWe0ak3q+uYh60ppQxg9F16Ri4tS1sfD4+jA=="],
-
- "bit-twiddle": ["bit-twiddle@1.0.2", "", {}, "sha512-B9UhK0DKFZhoTFcfvAzhqsjStvGJp9vYWf3+6SNTtdSQnvIgfkHbgHrg/e4+TH71N2GDu8tpmCVoyfrL1d7ntA=="],
-
- "bitmap-sdf": ["bitmap-sdf@1.0.4", "", {}, "sha512-1G3U4n5JE6RAiALMxu0p1XmeZkTeCwGKykzsLTCqVzfSDaN6S7fKnkIkfejogz+iwqBWc0UYAIKnKHNN7pSfDg=="],
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- "bl": ["bl@2.2.1", "", { "dependencies": { "readable-stream": "^2.3.5", "safe-buffer": "^5.1.1" } }, "sha512-6Pesp1w0DEX1N550i/uGV/TqucVL4AM/pgThFSN/Qq9si1/DF9aIHs1BxD8V/QU0HoeHO6cQRTAuYnLPKq1e4g=="],
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- "blurhash": ["blurhash@2.0.5", "", {}, "sha512-cRygWd7kGBQO3VEhPiTgq4Wc43ctsM+o46urrmPOiuAe+07fzlSB9OJVdpgDL0jPqXUVQ9ht7aq7kxOeJHRK+w=="],
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"brace-expansion": ["brace-expansion@2.1.0", "", { "dependencies": { "balanced-match": "^1.0.0" } }, "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w=="],
"browserslist": ["browserslist@4.28.2", "", { "dependencies": { "baseline-browser-mapping": "^2.10.12", "caniuse-lite": "^1.0.30001782", "electron-to-chromium": "^1.5.328", "node-releases": "^2.0.36", "update-browserslist-db": "^1.2.3" }, "bin": { "browserslist": "cli.js" } }, "sha512-48xSriZYYg+8qXna9kwqjIVzuQxi+KYWp2+5nCYnYKPTr0LvD89Jqk2Or5ogxz0NUMfIjhh2lIUX/LyX9B4oIg=="],
- "buffer-from": ["buffer-from@1.1.2", "", {}, "sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ=="],
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"cac": ["cac@6.7.14", "", {}, "sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ=="],
"call-bind-apply-helpers": ["call-bind-apply-helpers@1.0.2", "", { "dependencies": { "es-errors": "^1.3.0", "function-bind": "^1.1.2" } }, "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ=="],
@@ -911,18 +648,12 @@
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- "canvas-fit": ["canvas-fit@1.5.0", "", { "dependencies": { "element-size": "^1.1.1" } }, "sha512-onIcjRpz69/Hx5bB5HGbYKUF2uC6QT6Gp+pfpGm3A7mPfcluSLV5v4Zu+oflDUwLdUw0rLIBhUbi0v8hM4FJQQ=="],
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- "canvas-hypertxt": ["canvas-hypertxt@1.0.3", "", {}, "sha512-+VsMpRr64jYgKq2IeFUNel3vCZH/IzS+iXSHxmUV3IUH5dXlC9xHz4AwtPZisDxZ5MWcuK0V+TXgPKFPiZnxzg=="],
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"castable-video": ["castable-video@1.1.16", "", { "dependencies": { "custom-media-element": "~1.4.6" } }, "sha512-wBhe2dZu2afhewL3EaGgVYTyDsa9HvNhY98clMZkNzDrLelOValSrTaoMos9YX7PPBCrgpd1j6YmNyyI2Vbq3w=="],
"ccount": ["ccount@2.0.1", "", {}, "sha512-eyrF0jiFpY+3drT6383f1qhkbGsLSifNAjA61IUjZjmLCWjItY6LB9ft9YhoDgwfmclB2zhu51Lc7+95b8NRAg=="],
"ce-la-react": ["ce-la-react@0.3.2", "", { "peerDependencies": { "react": ">=17.0.0" } }, "sha512-QJ6k4lOD/btI08xG8jBPxRCGXvCnusGGkTsiXk0u3NqUu/W+BXRnFD4PYjwtqh8AWmGa5LDbGk0fLQsqr0nSMA=="],
- "char-regex": ["char-regex@1.0.2", "", {}, "sha512-kWWXztvZ5SBQV+eRgKFeh8q5sLuZY2+8WUIzlxWVTg+oGwY14qylx1KbKzHd8P6ZYkAg0xyIDU9JMHhyJMZ1jw=="],
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"character-entities": ["character-entities@2.0.2", "", {}, "sha512-shx7oQ0Awen/BRIdkjkvz54PnEEI/EjwXDSIZp86/KKdbafHh1Df/RYGBhn4hbe2+uKC9FnT5UCEdyPz3ai9hQ=="],
"character-entities-html4": ["character-entities-html4@2.1.0", "", {}, "sha512-1v7fgQRj6hnSwFpq1Eu0ynr/CDEw0rXo2B61qXrLNdHZmPKgb7fqS1a2JwF0rISo9q77jDI8VMEHoApn8qDoZA=="],
@@ -933,12 +664,8 @@
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- "clamp": ["clamp@1.0.1", "", {}, "sha512-kgMuFyE78OC6Dyu3Dy7vcx4uy97EIbVxJB/B0eJ3bUNAkwdNcxYzgKltnyADiYwsR7SEqkkUPsEUT//OVS6XMA=="],
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"class-variance-authority": ["class-variance-authority@0.7.1", "", { "dependencies": { "clsx": "^2.1.1" } }, "sha512-Ka+9Trutv7G8M6WT6SeiRWz792K5qEqIGEGzXKhAE6xOWAY6pPH8U+9IY3oCMv6kqTmLsv7Xh/2w2RigkePMsg=="],
- "classcat": ["classcat@5.0.5", "", {}, "sha512-JhZUT7JFcQy/EzW605k/ktHtncoo9vnyW/2GspNYwFlN1C/WmjuV/xtS04e9SOkL2sTdw0VAZ2UGCcQ9lR6p6w=="],
-
"classnames": ["classnames@2.5.1", "", {}, "sha512-saHYOzhIQs6wy2sVxTM6bUDsQO4F50V9RQ22qBpEdCW+I+/Wmke2HOl6lS6dTpdxVhb88/I6+Hs+438c3lfUow=="],
"cloudflare-video-element": ["cloudflare-video-element@1.3.5", "", {}, "sha512-zj9gjJa6xW8MNrfc4oKuwgGS0njRLpOlQjdifbuNxvy8k4Y3pKCyKCMG2XIsjd2iQGhgjS57b1P5VWdJlxcXBw=="],
@@ -949,29 +676,13 @@
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- "color-alpha": ["color-alpha@1.0.4", "", { "dependencies": { "color-parse": "^1.3.8" } }, "sha512-lr8/t5NPozTSqli+duAN+x+no/2WaKTeWvxhHGN+aXT6AJ8vPlzLa7UriyjWak0pSC2jHol9JgjBYnnHsGha9A=="],
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- "color-id": ["color-id@1.1.0", "", { "dependencies": { "clamp": "^1.0.1" } }, "sha512-2iRtAn6dC/6/G7bBIo0uupVrIne1NsQJvJxZOBCzQOfk7jRq97feaDZ3RdzuHakRXXnHGNwglto3pqtRx1sX0g=="],
-
- "color-name": ["color-name@1.1.4", "", {}, "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="],
-
- "color-normalize": ["color-normalize@1.5.0", "", { "dependencies": { "clamp": "^1.0.1", "color-rgba": "^2.1.1", "dtype": "^2.0.0" } }, "sha512-rUT/HDXMr6RFffrR53oX3HGWkDOP9goSAQGBkUaAYKjOE2JxozccdGyufageWDlInRAjm/jYPrf/Y38oa+7obw=="],
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- "color-parse": ["color-parse@2.0.0", "", { "dependencies": { "color-name": "^1.0.0" } }, "sha512-g2Z+QnWsdHLppAbrpcFWo629kLOnOPtpxYV69GCqm92gqSgyXbzlfyN3MXs0412fPBkFmiuS+rXposgBgBa6Kg=="],
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- "color-rgba": ["color-rgba@3.0.0", "", { "dependencies": { "color-parse": "^2.0.0", "color-space": "^2.0.0" } }, "sha512-PPwZYkEY3M2THEHHV6Y95sGUie77S7X8v+h1r6LSAPF3/LL2xJ8duUXSrkic31Nzc4odPwHgUbiX/XuTYzQHQg=="],
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- "color-space": ["color-space@2.3.2", "", {}, "sha512-BcKnbOEsOarCwyoLstcoEztwT0IJxqqQkNwDuA3a65sICvvHL2yoeV13psoDFh5IuiOMnIOKdQDwB4Mk3BypiA=="],
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- "grid-index": ["grid-index@1.1.0", "", {}, "sha512-HZRwumpOGUrHyxO5bqKZL0B0GlUpwtCAzZ42sgxUPniu33R1LSFH5yrIcBCHjkctCAh3mtWKcKd9J4vDDdeVHA=="],
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"has-symbols": ["has-symbols@1.1.0", "", {}, "sha512-1cDNdwJ2Jaohmb3sg4OmKaMBwuC48sYni5HUw2DvsC8LjGTLK9h+eb1X6RyuOHe4hT0ULCW68iomhjUoKUqlPQ=="],
"has-tostringtag": ["has-tostringtag@1.0.2", "", { "dependencies": { "has-symbols": "^1.0.3" } }, "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw=="],
@@ -1297,8 +810,6 @@
"hast-util-has-property": ["hast-util-has-property@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-MNilsvEKLFpV604hwfhVStK0usFY/QmM5zX16bo7EjnAEGofr5YyI37kzopBlZJkHD4t887i+q/C8/tr5Q94cA=="],
- "hast-util-heading-rank": ["hast-util-heading-rank@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-EJKb8oMUXVHcWZTDepnr+WNbfnXKFNf9duMesmr4S8SXTJBJ9M4Yok08pu9vxdJwdlGRhVumk9mEhkEvKGifwA=="],
-
"hast-util-interactive": ["hast-util-interactive@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-has-property": "^3.0.0" } }, "sha512-9VFa3kP6AT40BNYcPmn3jpsG+1KPDF0rUFCrFVQDUsuUXZ3YLODm8UGV0tmYzFpcOIQXTAOi2ccS3ywlj2dQTA=="],
"hast-util-is-element": ["hast-util-is-element@3.0.0", "", { "dependencies": { "@types/hast": "^3.0.0" } }, "sha512-Val9mnv2IWpLbNPqc/pUem+a7Ipj2aHacCwgNfTiK0vJKl0LF+4Ba4+v1oPHFpf3bLYmreq0/l3Gud9S5OH42g=="],
@@ -1307,8 +818,6 @@
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- "hast-util-sanitize": ["hast-util-sanitize@4.1.0", "", { "dependencies": { "@types/hast": "^2.0.0" } }, "sha512-Hd9tU0ltknMGRDv+d6Ro/4XKzBqQnP/EZrpiTbpFYfXv/uOhWeKc+2uajcbEvAEH98VZd7eII2PiXm13RihnLw=="],
-
"hast-util-to-html": ["hast-util-to-html@9.0.5", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "ccount": "^2.0.0", "comma-separated-tokens": "^2.0.0", "hast-util-whitespace": "^3.0.0", "html-void-elements": "^3.0.0", "mdast-util-to-hast": "^13.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0", "stringify-entities": "^4.0.0", "zwitch": "^2.0.4" } }, "sha512-OguPdidb+fbHQSU4Q4ZiLKnzWo8Wwsf5bZfbvu7//a9oTYoqD/fWpe96NuHkoS9h0ccGOTe0C4NGXdtS0iObOw=="],
"hast-util-to-jsx-runtime": ["hast-util-to-jsx-runtime@2.3.6", "", { "dependencies": { "@types/estree": "^1.0.0", "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "comma-separated-tokens": "^2.0.0", "devlop": "^1.0.0", "estree-util-is-identifier-name": "^3.0.0", "hast-util-whitespace": "^3.0.0", "mdast-util-mdx-expression": "^2.0.0", "mdast-util-mdx-jsx": "^3.0.0", "mdast-util-mdxjs-esm": "^2.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0", "style-to-js": "^1.0.0", "unist-util-position": "^5.0.0", "vfile-message": "^4.0.0" } }, "sha512-zl6s8LwNyo1P9uw+XJGvZtdFF1GdAkOg8ujOw+4Pyb76874fLps4ueHXDhXWdk6YHQ6OgUtinliG7RsYvCbbBg=="],
@@ -1333,8 +842,6 @@
"hoist-non-react-statics": ["hoist-non-react-statics@3.3.2", "", { "dependencies": { "react-is": "^16.7.0" } }, "sha512-/gGivxi8JPKWNm/W0jSmzcMPpfpPLc3dY/6GxhX2hQ9iGj3aDfklV4ET7NjKpSinLpJ5vafa9iiGIEZg10SfBw=="],
- "html-element-attributes": ["html-element-attributes@1.3.1", "", {}, "sha512-UrRKgp5sQmRnDy4TEwAUsu14XBUlzKB8U3hjIYDjcZ3Hbp86Jtftzxfgrv6E/ii/h78tsaZwAnAE8HwnHr0dPA=="],
-
"html-entities": ["html-entities@2.6.0", "", {}, "sha512-kig+rMn/QOVRvr7c86gQ8lWXq+Hkv6CbAH1hLu+RG338StTpE8Z0b44SDVaqVu7HGKf27frdmUYEs9hTUX/cLQ=="],
"html-url-attributes": ["html-url-attributes@3.0.1", "", {}, "sha512-ol6UPyBWqsrO6EJySPz2O7ZSr856WDrEzM5zMqp+FJJLGMW35cLYmmZnl0vztAZxRUoNZJFTCohfjuIJ8I4QBQ=="],
@@ -1345,69 +852,31 @@
"humps": ["humps@2.0.1", "", {}, "sha512-E0eIbrFWUhwfXJmsbdjRQFQPrl5pTEoKlz163j1mTqqUnU9PgR4AgB8AIITzuB3vLBdxZXyZ9TDIrwB2OASz4g=="],
- "iconv-lite": ["iconv-lite@0.4.24", "", { "dependencies": { "safer-buffer": ">= 2.1.2 < 3" } }, "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA=="],
-
- "ieee754": ["ieee754@1.2.1", "", {}, "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA=="],
-
"immediate": ["immediate@3.0.6", "", {}, "sha512-XXOFtyqDjNDAQxVfYxuF7g9Il/IbWmmlQg2MYKOH8ExIT1qg6xc4zyS3HaEEATgs1btfzxq15ciUiY7gjSXRGQ=="],
- "immer": ["immer@10.2.0", "", {}, "sha512-d/+XTN3zfODyjr89gM3mPq1WNX2B8pYsu7eORitdwyA2sBubnTl3laYlBk4sXY5FUa5qTZGBDPJICVbvqzjlbw=="],
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"import-fresh": ["import-fresh@3.3.1", "", { "dependencies": { "parent-module": "^1.0.0", "resolve-from": "^4.0.0" } }, "sha512-TR3KfrTZTYLPB6jUjfx6MF9WcWrHL9su5TObK4ZkYgBdWKPOFoSoQIdEuTuR82pmtxH2spWG9h6etwfr1pLBqQ=="],
"imsc": ["imsc@1.1.5", "", { "dependencies": { "sax": "1.2.1" } }, "sha512-V8je+CGkcvGhgl2C1GlhqFFiUOIEdwXbXLiu1Fcubvvbo+g9inauqT3l0pNYXGoLPBj3jxtZz9t+wCopMkwadQ=="],
- "inherits": ["inherits@2.0.4", "", {}, "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="],
-
- "ini": ["ini@4.1.3", "", {}, "sha512-X7rqawQBvfdjS10YU1y1YVreA3SsLrW9dX2CewP2EbBJM4ypVNLDkO5y04gejPwKIY9lR+7r9gn3rFPt/kmWFg=="],
-
"inline-style-parser": ["inline-style-parser@0.2.7", "", {}, "sha512-Nb2ctOyNR8DqQoR0OwRG95uNWIC0C1lCgf5Naz5H6Ji72KZ8OcFZLz2P5sNgwlyoJ8Yif11oMuYs5pBQa86csA=="],
- "internmap": ["internmap@2.0.3", "", {}, "sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg=="],
-
"is-alphabetical": ["is-alphabetical@2.0.1", "", {}, "sha512-FWyyY60MeTNyeSRpkM2Iry0G9hpr7/9kD40mD/cGQEuilcZYS4okz8SN2Q6rLCJ8gbCt6fN+rC+6tMGS99LaxQ=="],
"is-alphanumerical": ["is-alphanumerical@2.0.1", "", { "dependencies": { "is-alphabetical": "^2.0.0", "is-decimal": "^2.0.0" } }, "sha512-hmbYhX/9MUMF5uh7tOXyK/n0ZvWpad5caBA17GsC6vyuCqaWliRG5K1qS9inmUhEMaOBIW7/whAnSwveW/LtZw=="],
"is-arrayish": ["is-arrayish@0.2.1", "", {}, "sha512-zz06S8t0ozoDXMG+ube26zeCTNXcKIPJZJi8hBrF4idCLms4CG9QtK7qBl1boi5ODzFpjswb5JPmHCbMpjaYzg=="],
- "is-browser": ["is-browser@2.1.0", "", {}, "sha512-F5rTJxDQ2sW81fcfOR1GnCXT6sVJC104fCyfj+mjpwNEwaPYSn5fte5jiHmBg3DHsIoL/l8Kvw5VN5SsTRcRFQ=="],
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- "is-buffer": ["is-buffer@2.0.5", "", {}, "sha512-i2R6zNFDwgEHJyQUtJEk0XFi1i0dPFn/oqjK3/vPCcDeJvW5NQ83V8QbicfF1SupOaB0h8ntgBC2YiE7dfyctQ=="],
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"is-core-module": ["is-core-module@2.16.2", "", { "dependencies": { "hasown": "^2.0.3" } }, "sha512-evOr8xfXKxE6qSR0hSXL2r3sd7ALj8+7jQEUvPYcm5sgZFdJ+AYzT6yNmJenvIYQBgIGwfwz08sL8zoL7yq2BA=="],
"is-decimal": ["is-decimal@2.0.1", "", {}, "sha512-AAB9hiomQs5DXWcRB1rqsxGUstbRroFOPPVAomNk/3XHR5JyEZChOyTWe2oayKnsSsr/kcGqF+z6yuH6HHpN0A=="],
- "is-extendable": ["is-extendable@1.0.1", "", { "dependencies": { "is-plain-object": "^2.0.4" } }, "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA=="],
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- "is-finite": ["is-finite@1.1.0", "", {}, "sha512-cdyMtqX/BOqqNBBiKlIVkytNHm49MtMlYyn1zxzvJKWmFMlGzm+ry5BBfYyeY9YmNKbRSo/o7OX9w9ale0wg3w=="],
-
- "is-firefox": ["is-firefox@1.0.3", "", {}, "sha512-6Q9ITjvWIm0Xdqv+5U12wgOKEM2KoBw4Y926m0OFkvlCxnbG94HKAsVz8w3fWcfAS5YA2fJORXX1dLrkprCCxA=="],
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"is-hexadecimal": ["is-hexadecimal@2.0.1", "", {}, "sha512-DgZQp241c8oO6cA1SbTEWiXeoxV42vlcJxgH+B3hi1AiqqKruZR3ZGF8In3fj4+/y/7rHvlOZLZtgJ/4ttYGZg=="],
- "is-mobile": ["is-mobile@4.0.0", "", {}, "sha512-mlcHZA84t1qLSuWkt2v0I2l61PYdyQDt4aG1mLIXF5FDMm4+haBCxCPYSr/uwqQNRk1MiTizn0ypEuRAOLRAew=="],
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- "is-obj": ["is-obj@1.0.1", "", {}, "sha512-l4RyHgRqGN4Y3+9JHVrNqO+tN0rV5My76uW5/nuO4K1b6vw5G8d/cmFjP9tRfEsdhZNt0IFdZuK/c2Vr4Nb+Qg=="],
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- "is-plain-obj": ["is-plain-obj@1.1.0", "", {}, "sha512-yvkRyxmFKEOQ4pNXCmJG5AEQNlXJS5LaONXo5/cLdTZdWvsZ1ioJEonLGAosKlMWE8lwUy/bJzMjcw8az73+Fg=="],
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- "is-plain-object": ["is-plain-object@2.0.4", "", { "dependencies": { "isobject": "^3.0.1" } }, "sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og=="],
-
- "is-string-blank": ["is-string-blank@1.0.1", "", {}, "sha512-9H+ZBCVs3L9OYqv8nuUAzpcT9OTgMD1yAWrG7ihlnibdkbtB850heAmYWxHuXc4CHy4lKeK69tN+ny1K7gBIrw=="],
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- "is-svg-path": ["is-svg-path@1.0.2", "", {}, "sha512-Lj4vePmqpPR1ZnRctHv8ltSh1OrSxHkhUkd7wi+VQdcdP15/KvQFyk7LhNuM7ZW0EVbJz8kZLVmL9quLrfq4Kg=="],
+ "is-plain-obj": ["is-plain-obj@4.1.0", "", {}, "sha512-+Pgi+vMuUNkJyExiMBt5IlFoMyKnr5zhJ4Uspz58WOhBF5QoIZkFyNHIbBAtHwzVAgk5RtndVNsDRN61/mmDqg=="],
"is-what": ["is-what@4.1.16", "", {}, "sha512-ZhMwEosbFJkA0YhFnNDgTM4ZxDRsS6HqTo7qsZM08fehyRYIYa0yHu5R6mgo1n/8MgaPBXiPimPD77baVFYg+A=="],
- "isarray": ["isarray@2.0.5", "", {}, "sha512-xHjhDr3cNBK0BzdUJSPXZntQUx/mwMS5Rw4A7lPJ90XGAO6ISP/ePDNuo0vhqOZU+UD5JoodwCAAoZQd3FeAKw=="],
-
- "isbot": ["isbot@5.1.39", "", {}, "sha512-obH0yYahGXdzNxo+djmHhBYThUKDkz565cxkIlt2L9hXfv1NlaLKoDBHo6KxXsYrIXx2RK3x5vY36CfZcobxEw=="],
-
- "isexe": ["isexe@3.1.5", "", {}, "sha512-6B3tLtFqtQS4ekarvLVMZ+X+VlvQekbe4taUkf/rhVO3d/h0M2rfARm/pXLcPEsjjMsFgrFgSrhQIxcSVrBz8w=="],
-
- "isobject": ["isobject@3.0.1", "", {}, "sha512-WhB9zCku7EGTj/HQQRz5aUQEUeoQZH2bWcltRErOpymJ4boYE6wL9Tbr23krRPSZ+C5zqNSrSw+Cc7sZZ4b7vg=="],
+ "isbot": ["isbot@5.1.40", "", {}, "sha512-yNeeynhhtIVRBk12tBV4eHNxwB42HzR4Q3Ea7vCOiJhImGaAIdIMrbJtacQlBizGLjUPw+akkFI5Dn9T70XoVQ=="],
"jiti": ["jiti@2.7.0", "", { "bin": { "jiti": "lib/jiti-cli.mjs" } }, "sha512-AC/7JofJvZGrrneWNaEnJeOLUx+JlGt7tNa0wZiRPT4MY1wmfKjt2+6O2p2uz2+skll8OZZmJMNqeke7kKbNgQ=="],
@@ -1417,18 +886,10 @@
"json-parse-even-better-errors": ["json-parse-even-better-errors@2.3.1", "", {}, "sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w=="],
- "json-stringify-pretty-compact": ["json-stringify-pretty-compact@4.0.0", "", {}, "sha512-3CNZ2DnrpByG9Nqj6Xo8vqbjT4F6N+tb4Gb28ESAZjYZ5yqvmc56J+/kuIwkaAMOyblTQhUW7PxMkUb8Q36N3Q=="],
-
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- "react-textarea-autosize": ["react-textarea-autosize@8.5.9", "", { "dependencies": { "@babel/runtime": "^7.20.13", "use-composed-ref": "^1.3.0", "use-latest": "^1.2.1" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-U1DGlIQN5AwgjTyOEnI1oCcMuEr1pv1qOtklB2l4nyMGbHzWrI0eFsYK0zos2YWqAolJyG0IWJaqWmWj5ETh0A=="],
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- "reactflow": ["reactflow@11.11.4", "", { "dependencies": { "@reactflow/background": "11.3.14", "@reactflow/controls": "11.2.14", "@reactflow/core": "11.11.4", "@reactflow/minimap": "11.7.14", "@reactflow/node-resizer": "2.2.14", "@reactflow/node-toolbar": "1.3.14" }, "peerDependencies": { "react": ">=17", "react-dom": ">=17" } }, "sha512-70FOtJkUWH3BAOsN+LU9lCrKoKbtOPnz2uq0CV2PLdNSwxTXOhCbsZr50GmZ+Rtw3jx8Uv7/vBFtCGixLfd4Og=="],
+ "react-textarea-autosize": ["react-textarea-autosize@8.5.7", "", { "dependencies": { "@babel/runtime": "^7.20.13", "use-composed-ref": "^1.3.0", "use-latest": "^1.2.1" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-2MqJ3p0Jh69yt9ktFIaZmORHXw4c4bxSIhCeWiFwmJ9EYKgLmuNII3e9c9b2UO+ijl4StnpZdqpxNIhTdHvqtQ=="],
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+ "sax": ["sax@1.2.1", "", {}, "sha512-8I2a3LovHTOpm7NV5yOyO8IHqgVsfK4+UuySrXU8YXkSRX7k6hCV9b3HrkKCr3nMpgj+0bmocaJJWpvp1oc7ZA=="],
"scheduler": ["scheduler@0.27.0", "", {}, "sha512-eNv+WrVbKu1f3vbYJT/xtiF5syA5HPIMtf9IgY/nKg0sWqzAUEvqY/xm7OcZc/qafLx/iO9FgOmeSAp4v5ti/Q=="],
"semver": ["semver@7.8.0", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-AcM7dV/5ul4EekoQ29Agm5vri8JNqRyj39o0qpX6vDF2GZrtutZl5RwgD1XnZjiTAfncsJhMI48QQH3sN87YNA=="],
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- "shallow-copy": ["shallow-copy@0.0.1", "", {}, "sha512-b6i4ZpVuUxB9h5gfCxPiusKYkqTMOjEbBs4wMaFbkfia4yFv92UKZ6Df8WXcKbn08JNL/abvg3FnMAOfakDvUw=="],
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- "signum": ["signum@1.0.0", "", {}, "sha512-yodFGwcyt59XRh7w5W3jPcIQb3Bwi21suEfT7MAWnBX3iCdklJpgDgvGT9o04UonglZN5SNMfJFkHIR/jO8GHw=="],
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@@ -1919,22 +1222,8 @@
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- "stack-trace": ["stack-trace@0.0.9", "", {}, "sha512-vjUc6sfgtgY0dxCdnc40mK6Oftjo9+2K8H/NG81TMhgL392FtiPA9tn9RLyTxXmTLPJPjF3VyzFp6bsWFLisMQ=="],
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- "stream-parser": ["stream-parser@0.3.1", "", { "dependencies": { "debug": "2" } }, "sha512-bJ/HgKq41nlKvlhccD5kaCr/P+Hu0wPNKPJOH7en+YrJu/9EgqUF+88w5Jb6KNcjOFMhfX4B2asfeAtIGuHObQ=="],
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- "stream-shift": ["stream-shift@1.0.3", "", {}, "sha512-76ORR0DO1o1hlKwTbi/DM3EXWGf3ZJYO8cXX5RJwnul2DEg2oyoZyjLNoQM8WsvZiFKCRfC1O0J7iCvie3RZmQ=="],
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- "string_decoder": ["string_decoder@1.1.1", "", { "dependencies": { "safe-buffer": "~5.1.0" } }, "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg=="],
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- "strongly-connected-components": ["strongly-connected-components@1.0.1", "", {}, "sha512-i0TFx4wPcO0FwX+4RkLJi1MxmcTv90jNZgxMu9XRnMXMeFUY1VJlIoXpZunPUvUUqbCT1pg5PEkFqqpcaElNaA=="],
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"style-to-object": ["style-to-object@1.0.14", "", { "dependencies": { "inline-style-parser": "0.2.7" } }, "sha512-LIN7rULI0jBscWQYaSswptyderlarFkjQ+t79nzty8tcIAceVomEVlLzH5VP4Cmsv6MtKhs7qaAiwlcp+Mgaxw=="],
@@ -1943,74 +1232,36 @@
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-
- "superscript-text": ["superscript-text@1.0.0", "", {}, "sha512-gwu8l5MtRZ6koO0icVTlmN5pm7Dhh1+Xpe9O4x6ObMAsW+3jPbW14d1DsBq1F4wiI+WOFjXF35pslgec/G8yCQ=="],
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- "svg-arc-to-cubic-bezier": ["svg-arc-to-cubic-bezier@3.2.0", "", {}, "sha512-djbJ/vZKZO+gPoSDThGNpKDO+o+bAeA4XQKovvkNCqnIS2t+S4qnLAGQhyyrulhCFRl1WWzAp0wUDV8PpTVU3g=="],
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- "svg-path-sdf": ["svg-path-sdf@1.1.3", "", { "dependencies": { "bitmap-sdf": "^1.0.0", "draw-svg-path": "^1.0.0", "is-svg-path": "^1.0.1", "parse-svg-path": "^0.1.2", "svg-path-bounds": "^1.0.1" } }, "sha512-vJJjVq/R5lSr2KLfVXVAStktfcfa1pNFjFOgyJnzZFXlO/fDZ5DmM8FpnSKKzLPfEYTVeXuVBTHF296TpxuJVg=="],
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- "tailwindcss": ["tailwindcss@4.2.3", "", {}, "sha512-fA/NX5gMf0ooCLISgB0wScaWgaj6rjTN2SVAwleURjiya7ITNkV+VMmoHtKkldP6CIZoYCZyxb8zP/e2TWoEtQ=="],
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- "zustand": ["zustand@4.5.7", "", { "dependencies": { "use-sync-external-store": "^1.2.2" }, "peerDependencies": { "@types/react": ">=16.8", "immer": ">=9.0.6", "react": ">=16.8" }, "optionalPeers": ["@types/react", "immer", "react"] }, "sha512-CHOUy7mu3lbD6o6LJLfllpjkzhHXSBlX8B9+qPddUsIfeF5S/UZ5q0kmCsnRqT1UHFQZchNFDDzMbQsuesHWlw=="],
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@@ -2131,22 +1358,10 @@
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- "@inkeep/cxkit-primitives/react-textarea-autosize": ["react-textarea-autosize@8.5.7", "", { "dependencies": { "@babel/runtime": "^7.20.13", "use-composed-ref": "^1.3.0", "use-latest": "^1.2.1" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-2MqJ3p0Jh69yt9ktFIaZmORHXw4c4bxSIhCeWiFwmJ9EYKgLmuNII3e9c9b2UO+ijl4StnpZdqpxNIhTdHvqtQ=="],
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- "@maplibre/maplibre-gl-style-spec/@mapbox/unitbezier": ["@mapbox/unitbezier@0.0.1", "", {}, "sha512-nMkuDXFv60aBr9soUG5q+GvZYL+2KZHVvsqFCzqnkGEf46U2fvmytHaEVc1/YZbiLn8X+eR3QzX1+dwDO1lxlw=="],
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@@ -2159,92 +1374,12 @@
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- "ag-charts-community/ag-charts-types": ["ag-charts-types@11.2.4", "", {}, "sha512-a1aQjtQ9ZH+J8BF3YcWAIHUt9ZLiL9IVZ8R5h7z2CkTNu2TPq5UlsCcF0/YZKc1M8CM0CdSNLSGQuWUwDNxAcA=="],
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- "ag-grid-enterprise/ag-charts-community": ["ag-charts-community@12.3.1", "", { "dependencies": { "ag-charts-core": "12.3.1", "ag-charts-locale": "12.3.1", "ag-charts-types": "12.3.1" } }, "sha512-uRaUFmCl8e0Y3KxjaHUYlkCPS5OtwtfTChkdpoZuBKDXqerCPTjPu+uvlun3rYUSYxScwVf2LZCI0Hfw4Vc+WQ=="],
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@@ -2341,29 +1476,7 @@
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- "color-normalize/color-rgba/color-parse": ["color-parse@1.4.3", "", { "dependencies": { "color-name": "^1.0.0" } }, "sha512-BADfVl/FHkQkyo8sRBwMYBqemqsgnu7JZAwUgvBvuwwuNUZAhSvLTbsEErS5bQXzOjDR0dWzJ4vXN2Q+QoPx0A=="],
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"@inkeep/cxkit-primitives/@radix-ui/react-avatar/@radix-ui/react-primitive/@radix-ui/react-slot": ["@radix-ui/react-slot@1.1.1", "", { "dependencies": { "@radix-ui/react-compose-refs": "1.1.1" }, "peerDependencies": { "@types/react": "*", "react": "^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-RApLLOcINYJA+dMVbOju7MYv1Mb2EBp2nH4HdDzXTSyaR5optlm6Otrz1euW3HbdOR8UmmFK06TD+A9frYWv+g=="],
@@ -2427,14 +1540,6 @@
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- "glsl-tokenizer/through2/readable-stream/isarray": ["isarray@0.0.1", "", {}, "sha512-D2S+3GLxWH+uhrNEcoh/fnmYeP8E8/zHl644d/jdA0g2uyXvy3sb0qxotE+ne0LtccHknQzWwZEzhak7oJ0COQ=="],
-
- "glsl-tokenizer/through2/readable-stream/string_decoder": ["string_decoder@0.10.31", "", {}, "sha512-ev2QzSzWPYmy9GuqfIVildA4OdcGLeFZQrq5ys6RtiuF+RQQiZWr8TZNyAcuVXyQRYfEO+MsoB/1BuQVhOJuoQ=="],
-
- "rehype-sanitize/unified/vfile/unist-util-stringify-position": ["unist-util-stringify-position@3.0.3", "", { "dependencies": { "@types/unist": "^2.0.0" } }, "sha512-k5GzIBZ/QatR8N5X2y+drfpWG8IDBzdnVj6OInRNWm1oXrzydiaAT2OQiA8DPRRZyAKb9b6I2a6PxYklZD0gKg=="],
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- "rehype-sanitize/unified/vfile/vfile-message": ["vfile-message@3.1.4", "", { "dependencies": { "@types/unist": "^2.0.0", "unist-util-stringify-position": "^3.0.0" } }, "sha512-fa0Z6P8HUrQN4BZaX05SIVXic+7kE3b05PWAtPuYP9QLHsLKYR7/AlLW3NtOrpXRLeawpDLMsVkmk5DG0NXgWw=="],
-
"@inkeep/cxkit-primitives/@radix-ui/react-avatar/@radix-ui/react-primitive/@radix-ui/react-slot/@radix-ui/react-compose-refs": ["@radix-ui/react-compose-refs@1.1.1", "", { "peerDependencies": { "@types/react": "*", "react": "^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-Y9VzoRDSJtgFMUCoiZBDVo084VQ5hfpXxVE+NgkdNsjiDBByiImMZKKhxMwCbdHvhlENG6a833CbFkOQvTricw=="],
}
}
diff --git a/docs/app/reflex.lock/package.json b/docs/app/reflex.lock/package.json
index ffda398ce7f..b4ee0ca5f95 100644
--- a/docs/app/reflex.lock/package.json
+++ b/docs/app/reflex.lock/package.json
@@ -7,84 +7,53 @@
},
"dependencies": {
"@base-ui/react": "1.4.1",
- "@glideapps/glide-data-grid": "6.0.3",
"@hugeicons/core-free-icons": "4.1.1",
"@hugeicons/react": "1.1.6",
"@inkeep/cxkit-react": "0.5.115",
- "@mantine/core": "8.3.9",
- "@masenf/hello-react": "github:masenf/hello-react",
"@radix-ui/react-accordion": "1.2.12",
"@radix-ui/react-dialog": "1.1.15",
"@radix-ui/react-form": "0.1.8",
"@radix-ui/themes": "3.3.0",
- "@react-router/node": "7.14.1",
- "@splinetool/react-spline": "4.1.0",
- "@splinetool/runtime": "1.5.5",
- "@xyflow/react": "12.8.4",
- "ag-charts-enterprise": "11.2.4",
- "ag-charts-react": "11.2.4",
- "ag-grid-community": "34.3.1",
- "ag-grid-enterprise": "34.3.1",
- "ag-grid-react": "34.3.1",
+ "@react-router/node": "7.15.0",
"clsx-for-tailwind": "1.0.0",
- "gridjs": "6.2.0",
- "gridjs-react": "6.1.1",
"hast-util-to-string": "3.0.1",
- "isbot": "5.1.39",
- "leaflet": "1.9.4",
- "lodash": "4.18.1",
- "lucide-react": "1.8.0",
- "mergician": "v2.0.2",
+ "isbot": "5.1.40",
+ "lucide-react": "1.14.0",
"moment": "2.30.1",
- "moment-timezone": "^0.6.2",
- "plotly.js": "3.5.0",
- "react": "19.2.5",
- "react-colorful": "5.7.0",
- "react-debounce-input": "3.3.0",
- "react-dnd": "^16.0.1",
- "react-dnd-html5-backend": "^16.0.1",
- "react-dom": "19.2.5",
- "react-dropzone": "15.0.0",
+ "react": "19.2.6",
+ "react-dom": "19.2.6",
"react-fast-marquee": "1.6.5",
"react-helmet": "6.1.0",
- "react-leaflet": "5.0.0",
"react-markdown": "10.1.0",
"react-moment": "1.2.2",
"react-player": "3.4.0",
- "react-plotly.js": "2.6.0",
- "react-responsive-carousel": "3.2.23",
- "react-router": "7.14.1",
- "react-router-dom": "7.14.1",
+ "react-router": "7.15.0",
+ "react-router-dom": "7.15.0",
"react-syntax-highlighter": "16.1.1",
- "reactflow": "^11.11.4",
- "recharts": "3.8.1",
- "rehype-autolink-headings": "7.1.0",
"rehype-katex": "7.0.1",
"rehype-raw": "7.0.0",
- "rehype-sanitize": "5.0.1",
- "rehype-slug": "6.0.0",
"rehype-unwrap-images": "1.0.0",
- "remark-emoji": "5.0.2",
"remark-gfm": "4.0.1",
"remark-math": "6.0.0",
"shiki": "3.3.0",
"socket.io-client": "4.8.3",
"sonner": "2.0.7",
"tailwindcss-animated": "2.0.0",
+ "tailwindcss-scroll-mask": "0.0.3@2.0.0",
"universal-cookie": "7.2.2",
"vaul": "1.1.2"
},
"devDependencies": {
"@emotion/react": "11.14.0",
- "@react-router/dev": "7.14.1",
- "@react-router/fs-routes": "7.14.1",
- "@tailwindcss/postcss": "4.2.3",
+ "@react-router/dev": "7.15.0",
+ "@react-router/fs-routes": "7.15.0",
+ "@tailwindcss/postcss": "4.3.0",
"@tailwindcss/typography": "0.5.19",
"autoprefixer": "10.5.0",
- "postcss": "8.5.10",
+ "postcss": "8.5.14",
"postcss-import": "16.1.1",
- "tailwindcss": "4.2.3",
- "vite": "8.0.9"
+ "tailwindcss": "4.3.0",
+ "vite": "8.0.12"
},
"overrides": {
"cookie": "1.1.1"
diff --git a/docs/app/styles/tailwind.css b/docs/app/styles/tailwind.css
new file mode 100644
index 00000000000..1242c0597fc
--- /dev/null
+++ b/docs/app/styles/tailwind.css
@@ -0,0 +1,6 @@
+@layer theme, base, components, utilities;
+@import "tailwindcss/theme.css" layer(theme);
+@import "tailwindcss/preflight.css" layer(base);
+@import "@radix-ui/themes/styles.css" layer(components);
+@import "tailwindcss/utilities.css" layer(utilities);
+@config "../tailwind.config.js";
diff --git a/docs/app/tailwind.config.js b/docs/app/tailwind.config.js
new file mode 100644
index 00000000000..805e2330a45
--- /dev/null
+++ b/docs/app/tailwind.config.js
@@ -0,0 +1,18 @@
+
+
+
+import plugin1 from "@tailwindcss/typography";
+
+
+
+export default {
+ content: ["./app/**/*.{js,ts,jsx,tsx}", "./utils/**/*.{js,ts,jsx,tsx}"],
+ theme: {},
+
+
+
+
+
+
+ plugins: [plugin1]
+};
diff --git a/packages/reflex-compiler-rust/.gitignore b/packages/reflex-compiler-rust/.gitignore
new file mode 100644
index 00000000000..08a548c5a57
--- /dev/null
+++ b/packages/reflex-compiler-rust/.gitignore
@@ -0,0 +1,7 @@
+target/
+dist/
+wheels/
+*.so
+*.pyd
+__pycache__/
+.venv/
diff --git a/packages/reflex-compiler-rust/Cargo.lock b/packages/reflex-compiler-rust/Cargo.lock
new file mode 100644
index 00000000000..18a0b68c4ae
--- /dev/null
+++ b/packages/reflex-compiler-rust/Cargo.lock
@@ -0,0 +1,419 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+version = "1.5.0"
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+
+[[package]]
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+
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+
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+ "crossbeam-utils",
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+
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+[[package]]
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+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
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+[[package]]
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+checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
+
+[[package]]
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+checksum = "c33a9471896f1c69cecef8d20cbe2f7accd12527ce60845ff44c153bb2a21b49"
+
+[[package]]
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+checksum = "8fd00f0bb2e90d81d1044c2b32617f68fcb9fa3bb7640c23e9c748e53fb30934"
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+ "unicode-ident",
+]
+
+[[package]]
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+checksum = "f402062616ab18202ae8319da13fa4279883a2b8a9d9f83f20dbade813ce1884"
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+ "cfg-if",
+ "indoc",
+ "libc",
+ "memoffset",
+ "once_cell",
+ "portable-atomic",
+ "pyo3-build-config",
+ "pyo3-ffi",
+ "pyo3-macros",
+ "unindent",
+]
+
+[[package]]
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+ "target-lexicon",
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+
+[[package]]
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+ "libc",
+ "pyo3-build-config",
+]
+
+[[package]]
+name = "pyo3-macros"
+version = "0.22.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fd24d897903a9e6d80b968368a34e1525aeb719d568dba8b3d4bfa5dc67d453"
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+ "quote",
+ "syn",
+]
+
+[[package]]
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+dependencies = [
+ "heck",
+ "proc-macro2",
+ "pyo3-build-config",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41f2619966050689382d2b44f664f4bc593e129785a36d6ee376ddf37259b924"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rayon"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb39b166781f92d482534ef4b4b1b2568f42613b53e5b6c160e24cfbfa30926d"
+dependencies = [
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22e18b0f0062d30d4230b2e85ff77fdfe4326feb054b9783a3460d8435c8ab91"
+dependencies = [
+ "crossbeam-deque",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "reflex_arena"
+version = "0.0.0"
+dependencies = [
+ "bumpalo",
+]
+
+[[package]]
+name = "reflex_bench"
+version = "0.0.0"
+
+[[package]]
+name = "reflex_codegen"
+version = "0.0.0"
+dependencies = [
+ "itoa",
+ "reflex_arena",
+ "reflex_intern",
+ "reflex_ir",
+ "reflex_semantic",
+ "ryu",
+]
+
+[[package]]
+name = "reflex_db"
+version = "0.0.0"
+dependencies = [
+ "rayon",
+ "reflex_arena",
+ "reflex_codegen",
+ "reflex_intern",
+ "reflex_ir",
+ "thiserror",
+ "xxhash-rust",
+]
+
+[[package]]
+name = "reflex_intern"
+version = "0.0.0"
+
+[[package]]
+name = "reflex_ir"
+version = "0.0.0"
+dependencies = [
+ "bumpalo",
+ "reflex_arena",
+ "reflex_intern",
+ "rmp",
+ "thiserror",
+]
+
+[[package]]
+name = "reflex_py"
+version = "0.0.0"
+dependencies = [
+ "bumpalo",
+ "pyo3",
+ "reflex_arena",
+ "reflex_codegen",
+ "reflex_db",
+ "reflex_intern",
+ "reflex_ir",
+ "reflex_pyread",
+ "rmp",
+ "rmp-serde",
+ "serde",
+ "thiserror",
+]
+
+[[package]]
+name = "reflex_pyread"
+version = "0.0.0"
+dependencies = [
+ "pyo3",
+ "reflex_arena",
+ "reflex_intern",
+ "reflex_ir",
+ "thiserror",
+]
+
+[[package]]
+name = "reflex_semantic"
+version = "0.0.0"
+dependencies = [
+ "reflex_arena",
+ "reflex_intern",
+ "reflex_ir",
+]
+
+[[package]]
+name = "reflex_vars"
+version = "0.0.0"
+
+[[package]]
+name = "rmp"
+version = "0.8.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ba8be72d372b2c9b35542551678538b562e7cf86c3315773cae48dfbfe7790c"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "rmp-serde"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72f81bee8c8ef9b577d1681a70ebbc962c232461e397b22c208c43c04b67a155"
+dependencies = [
+ "rmp",
+ "serde",
+]
+
+[[package]]
+name = "rustversion"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
+
+[[package]]
+name = "ryu"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
+
+[[package]]
+name = "serde"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "target-lexicon"
+version = "0.12.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
+
+[[package]]
+name = "thiserror"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
+
+[[package]]
+name = "unindent"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7264e107f553ccae879d21fbea1d6724ac785e8c3bfc762137959b5802826ef3"
+
+[[package]]
+name = "xxhash-rust"
+version = "0.8.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fdd20c5420375476fbd4394763288da7eb0cc0b8c11deed431a91562af7335d3"
diff --git a/packages/reflex-compiler-rust/Cargo.toml b/packages/reflex-compiler-rust/Cargo.toml
new file mode 100644
index 00000000000..fd8f25eb992
--- /dev/null
+++ b/packages/reflex-compiler-rust/Cargo.toml
@@ -0,0 +1,55 @@
+[workspace]
+resolver = "2"
+members = [
+ "crates/reflex_ir",
+ "crates/reflex_arena",
+ "crates/reflex_intern",
+ "crates/reflex_db",
+ "crates/reflex_semantic",
+ "crates/reflex_codegen",
+ "crates/reflex_py",
+ "crates/reflex_bench",
+ "crates/reflex_vars",
+ "crates/reflex_pyread",
+]
+
+[workspace.package]
+edition = "2021"
+rust-version = "1.79"
+license = "Apache-2.0"
+publish = false
+
+[workspace.dependencies]
+# Local crates
+reflex_ir = { path = "crates/reflex_ir" }
+reflex_arena = { path = "crates/reflex_arena" }
+reflex_intern = { path = "crates/reflex_intern" }
+reflex_db = { path = "crates/reflex_db" }
+reflex_semantic = { path = "crates/reflex_semantic" }
+reflex_codegen = { path = "crates/reflex_codegen" }
+reflex_vars = { path = "crates/reflex_vars" }
+reflex_pyread = { path = "crates/reflex_pyread" }
+
+# Internal-but-shared
+xxhash-rust = { version = "0.8", features = ["xxh3"] }
+
+# External
+pyo3 = { version = "0.22", features = ["abi3-py310", "extension-module"] }
+bumpalo = { version = "3.16", features = ["collections"] }
+rayon = "1.10"
+rmp = "0.8"
+rmp-serde = "1.3"
+serde = { version = "1", features = ["derive"] }
+thiserror = "1.0"
+
+[profile.release]
+opt-level = 3
+lto = "fat"
+codegen-units = 1
+debug = false
+strip = "symbols"
+
+[profile.bench]
+inherits = "release"
+debug = true
+strip = "none"
diff --git a/packages/reflex-compiler-rust/README.md b/packages/reflex-compiler-rust/README.md
new file mode 100644
index 00000000000..3bcf460e8e8
--- /dev/null
+++ b/packages/reflex-compiler-rust/README.md
@@ -0,0 +1,66 @@
+# reflex-compiler-rust (spike phase)
+
+Workspace skeleton for the Rust rewrite of the Reflex compiler. See
+`ignore/RUST_REWRITE_PLAN.md` (§3 — crate skeleton) for the long version.
+
+**Status:** scaffold + napkin-math benchmarks only. No real compiler logic
+yet. All non-`reflex_py` crates are stub `lib.rs` files. Do NOT depend on
+this package; it is not published and the IR contract is in flux.
+
+## Why this exists right now
+
+The plan claims the round trip `Python → msgpack → Rust → emit → bytes`
+beats the current Python compiler. Before writing any real port we need
+numbers on the dominant costs:
+
+1. PyO3 crossing cost (per call)
+2. msgpack serialize on the Python side
+3. msgpack deserialize on the Rust side (rmp-serde vs hand-rolled)
+4. Tree walk + JSX-like emit (Python vs Rust)
+
+The spike code lives in `crates/reflex_py/src/lib.rs`; the driver in
+`scripts/spike_bench.py`.
+
+## Build + run
+
+```
+cd packages/reflex-compiler-rust
+uv venv .venv && . .venv/bin/activate
+uv pip install maturin msgpack
+maturin develop --release
+uv run python scripts/spike_bench.py --sizes 10,100,1000,10000
+```
+
+`maturin develop --release` is non-negotiable — the debug profile is 5–20×
+slower and would lie about the steady-state cost.
+
+## Layout
+
+```
+Cargo.toml # workspace root, all 8 crates
+pyproject.toml # maturin, abi3-py310, points to crates/reflex_py
+rust-toolchain.toml # pinned stable
+python/reflex_compiler_rust # thin python wrapper around the cdylib
+crates/
+ reflex_ir/ stub # IR enum types — §3.2
+ reflex_arena/ stub # bumpalo + thread-local stash — §3.1
+ reflex_intern/ stub # Symbol interning — §3
+ reflex_db/ stub # Salsa boundary — §3.3
+ reflex_semantic/ stub # six aggregator walks — D7
+ reflex_codegen/ stub # IR → JS/JSX/CSS — D8
+ reflex_py/ REAL # PyO3 entry + spike probes
+ reflex_bench/ stub # criterion benches (TODO)
+scripts/
+ spike_bench.py # the napkin-math driver
+```
+
+## What the spike measures vs the real plan
+
+| Spike probe | Plan section / claim it tests |
+|------------------------------------|-------------------------------|
+| `empty_call`, `bytes_passthrough` | §5 hot-reload budget — the per-call floor |
+| `pack_streaming` (Python) | §1 "no per-node dict" / §5 IR-emit <0.10ms/page |
+| `walk_serde` | Pitfall 12: "rmp-serde allocates strings to heap" |
+| `walk_manual` | §1 "custom Rust deserializer into bumpalo arena" |
+| `walk_manual_emit` / `walk_arena_emit` | §5 "Rust compile work 2.81s → <0.5s" |
+| `walk_emit_join` (Python) | The Python baseline for codegen |
diff --git a/packages/reflex-compiler-rust/crates/reflex_arena/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_arena/Cargo.toml
new file mode 100644
index 00000000000..c0f9838b41e
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_arena/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "reflex_arena"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+bumpalo = { workspace = true }
diff --git a/packages/reflex-compiler-rust/crates/reflex_arena/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_arena/src/lib.rs
new file mode 100644
index 00000000000..745f420666c
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_arena/src/lib.rs
@@ -0,0 +1,186 @@
+//! Bump arena + thread-local single-slot stash. See plan §3.1, §3.3, R1/R2/R8.
+//!
+//! R2 (no-Drop): `Arena::alloc` requires `T: Copy`, which Rust enforces is
+//! mutually exclusive with `Drop`. The const assertion is belt-and-braces —
+//! it catches `Copy` types that wrap a `ManuallyDrop`-disabled non-trivial
+//! payload before they ever reach a hot path.
+//!
+//! R8 deviation: the plan calls for `#[thread_local]` (nightly-only). We use
+//! the stable `thread_local!` macro. The teardown race R8 cites is specific
+//! to bun's mimalloc; `bumpalo::Bump` releases via the default allocator at
+//! Drop, so the destructor ordering issue does not apply.
+
+use std::cell::{Cell, RefCell};
+
+use bumpalo::Bump;
+
+pub struct Arena(Bump);
+
+impl Arena {
+ #[inline]
+ pub fn new() -> Self {
+ Self(Bump::new())
+ }
+
+ #[inline]
+ pub fn with_capacity(cap: usize) -> Self {
+ Self(Bump::with_capacity(cap))
+ }
+
+ /// Allocate one `T`. `T: Copy` is the R2 enforcement; the const assert is
+ /// a redundancy that catches future regressions.
+ #[inline(always)]
+ pub fn alloc<T: Copy>(&self, value: T) -> &mut T {
+ const { assert!(!std::mem::needs_drop::<T>()) }
+ self.0.alloc(value)
+ }
+
+ #[inline]
+ pub fn alloc_slice_copy<T: Copy>(&self, src: &[T]) -> &mut [T] {
+ const { assert!(!std::mem::needs_drop::<T>()) }
+ self.0.alloc_slice_copy(src)
+ }
+
+ /// Build a slice from an iterator, copying through the arena.
+ #[inline]
+ pub fn alloc_slice_fill_iter<T, I>(&self, iter: I) -> &mut [T]
+ where
+ T: Copy,
+ I: IntoIterator<Item = T>,
+ I::IntoIter: ExactSizeIterator,
+ {
+ const { assert!(!std::mem::needs_drop::<T>()) }
+ self.0.alloc_slice_fill_iter(iter)
+ }
+
+ #[inline]
+ pub fn alloc_str(&self, s: &str) -> &str {
+ self.0.alloc_str(s)
+ }
+
+ #[inline]
+ pub fn bump(&self) -> &Bump {
+ &self.0
+ }
+
+ #[inline]
+ pub fn reset(&mut self) {
+ self.0.reset();
+ }
+
+ #[inline]
+ pub fn allocated_bytes(&self) -> usize {
+ self.0.allocated_bytes()
+ }
+}
+
+impl Default for Arena {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+thread_local! {
+ static ARENA_STASH: RefCell<Option<Arena>> = const { RefCell::new(None) };
+}
+
+/// An arena rented from the thread-local stash. Returned to the stash on Drop,
+/// or freed if the stash is occupied (bun's single-slot semantic — nested
+/// scopes are rare; the second arena drops normally).
+pub struct PooledArena {
+ arena: Option<Arena>,
+ used: Cell<bool>,
+}
+
+impl PooledArena {
+ #[inline]
+ pub fn acquire() -> Self {
+ let arena = ARENA_STASH
+ .with(|cell| cell.borrow_mut().take())
+ .unwrap_or_else(Arena::new);
+ Self {
+ arena: Some(arena),
+ used: Cell::new(false),
+ }
+ }
+
+ /// Borrow the arena. First call marks the arena as used; Drop will reset
+ /// before returning to the stash. If never called, Drop skips the reset
+ /// (R8 dirty-bit).
+ #[inline]
+ pub fn arena(&self) -> &Arena {
+ self.used.set(true);
+ self.arena
+ .as_ref()
+ .expect("arena always present until Drop")
+ }
+}
+
+impl Drop for PooledArena {
+ fn drop(&mut self) {
+ let Some(mut arena) = self.arena.take() else {
+ return;
+ };
+ if self.used.get() {
+ arena.reset();
+ }
+ ARENA_STASH.with(|cell| {
+ let mut slot = cell.borrow_mut();
+ if slot.is_none() {
+ *slot = Some(arena);
+ }
+ });
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[derive(Clone, Copy)]
+ struct Point {
+ x: i32,
+ y: i32,
+ }
+
+ #[test]
+ fn alloc_returns_arena_ref() {
+ let arena = Arena::new();
+ let p = arena.alloc(Point { x: 1, y: 2 });
+ assert_eq!(p.x, 1);
+ assert_eq!(p.y, 2);
+ }
+
+ #[test]
+ fn alloc_str_copies_into_arena() {
+ let arena = Arena::new();
+ let s = String::from("hello");
+ let r = arena.alloc_str(&s);
+ drop(s);
+ assert_eq!(r, "hello");
+ }
+
+ #[test]
+ fn alloc_slice_copies() {
+ let arena = Arena::new();
+ let src = [1u32, 2, 3, 4];
+ let r = arena.alloc_slice_copy(&src);
+ assert_eq!(r, &[1, 2, 3, 4]);
+ }
+
+ #[test]
+ fn pooled_arena_round_trip() {
+ let a = PooledArena::acquire();
+ let _ = a.arena().alloc(42u32);
+ drop(a);
+ let b = PooledArena::acquire();
+ let _ = b.arena().alloc(7u32);
+ drop(b);
+ }
+
+ #[test]
+ fn unused_pooled_arena_skips_reset() {
+ let a = PooledArena::acquire();
+ drop(a);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_bench/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_bench/Cargo.toml
new file mode 100644
index 00000000000..d9e9de3ca6e
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_bench/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "reflex_bench"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
diff --git a/packages/reflex-compiler-rust/crates/reflex_bench/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_bench/src/lib.rs
new file mode 100644
index 00000000000..1b34ce55d77
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_bench/src/lib.rs
@@ -0,0 +1 @@
+//! Fixture-driven Rust benchmarks (criterion etc.). Stub during spike phase — spike benches live in `reflex_py`.
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_codegen/Cargo.toml
new file mode 100644
index 00000000000..84d45e8b3cf
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "reflex_codegen"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+reflex_ir = { workspace = true }
+reflex_intern = { workspace = true }
+reflex_arena = { workspace = true }
+reflex_semantic = { workspace = true }
+itoa = "1"
+ryu = "1"
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/app_root.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/app_root.rs
new file mode 100644
index 00000000000..903179b7a01
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/app_root.rs
@@ -0,0 +1,72 @@
+//! App-root wrapper emission. See plan §4.5 (artifact #5), D10.
+//!
+//! The app root is the top-level React component that wraps every page with
+//! providers (state, theme, color-mode) plus error boundaries. The shape
+//! mirrors Reflex's existing template, with imports gathered from the
+//! `PluginManifest.stylesheet_imports` list.
+
+use reflex_intern::resolve_unchecked;
+use reflex_ir::PluginManifest;
+
+use crate::buffer::CodeBuffer;
+
+pub fn emit_app_root(buf: &mut CodeBuffer, manifest: &PluginManifest<'_>) {
+ buf.write_str("import { jsx, Fragment } from \"react/jsx-runtime\";\n");
+ buf.write_str("import { StateContext, ColorModeContext, initialState } from \"./context\";\n");
+ buf.write_str("import { useState } from \"react\";\n");
+
+ // Plugin stylesheets — `import "./some.css";` side-effect imports.
+ let mut emitted = std::collections::HashSet::new();
+ for plugin in manifest.plugins {
+ for ss in plugin.stylesheet_imports {
+ if !emitted.insert(*ss) {
+ continue;
+ }
+ buf.write_str("import ");
+ buf.write_js_string(resolve_unchecked(*ss));
+ buf.write_str(";\n");
+ }
+ }
+
+ buf.write_str("\nexport default function AppWrap({ children }) {\n");
+ buf.write_str(" const [state, setState] = useState(initialState);\n");
+ buf.write_str(" const [colorMode, setColorMode] = useState(\"system\");\n");
+ buf.write_str(" return jsx(StateContext.Provider, { value: state }, ");
+ buf.write_str("jsx(ColorModeContext.Provider, { value: colorMode }, children));\n");
+ buf.write_str("}\n");
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_ir::{PluginEntry, PluginManifest};
+
+ #[test]
+ fn emits_app_root_shell() {
+ let manifest = PluginManifest {
+ schema_version: 1,
+ plugins: &[],
+ };
+ let mut buf = CodeBuffer::new();
+ emit_app_root(&mut buf, &manifest);
+ let s = buf.as_str();
+ assert!(s.contains("export default function AppWrap"));
+ assert!(s.contains("StateContext.Provider"));
+ }
+
+ #[test]
+ fn emits_plugin_stylesheets() {
+ let entry = PluginEntry {
+ name: reflex_intern::intern("radix"),
+ static_assets: &[],
+ stylesheet_imports: &[reflex_intern::intern("@radix-ui/themes/styles.css")],
+ };
+ let manifest = PluginManifest {
+ schema_version: 1,
+ plugins: std::slice::from_ref(&entry),
+ };
+ let mut buf = CodeBuffer::new();
+ emit_app_root(&mut buf, &manifest);
+ assert!(buf.as_str().contains("import \"@radix-ui/themes/styles.css\""));
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/app_root_module.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/app_root_module.rs
new file mode 100644
index 00000000000..23f8d8ced82
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/app_root_module.rs
@@ -0,0 +1,130 @@
+//! Port of `app_root_template` (the legacy `.web/app/root.jsx`
+//! template), distinct from the IR-based `emit_app_root` in `app_root.rs`.
+//!
+//! The legacy template lays out the React-Router root: providers
+//! (state, theme, event loop), an `AppWrap` shell that runs hooks +
+//! renders the app-wrap-composed Component tree, the document Layout
+//! wrap, and the EmbedLayout fallback used when `mount_target` is set.
+//!
+//! Phase-1 port: Python still does the dynamic rendering (component
+//! → JSX, hooks → JS, imports → import lines) — those depend on the
+//! legacy `_RenderUtils.render` walk. Rust assembles the static
+//! template + splices the pre-rendered strings. Phase 2 will move
+//! the renderers to Rust too.
+
+use std::io::{self, Write};
+
+/// Emit `.web/app/root.jsx`.
+///
+/// Mirrors `app_root_template` in
+/// `packages/reflex-base/src/reflex_base/compiler/templates.py`. The
+/// rendered output starts with a leading newline to match the legacy
+/// f-string's `\n{imports_str}...` opening.
+///
+/// Args:
+/// imports_str: rendered `import { … } from "…"` lines, joined
+/// with `\n` by the caller.
+/// dynamic_imports_str: rendered dynamic-import statements, joined
+/// with `\n` by the caller.
+/// custom_code_str: any user-contributed top-level code, joined
+/// with `\n`.
+/// hooks_str: rendered hook body (already includes its leading
+/// indentation), or empty.
+/// render_str: rendered JSX expression for the app-wrap chain — the
+/// expression spliced inside `return (…)` in `AppWrap`.
+/// import_window_libraries: rendered
+/// `import * as <alias> from "…"` lines for window libraries.
+/// window_imports_str: rendered `"<path>": <alias>,` entries that
+/// populate the global `window["__reflex"]` mapping.
+/// w: byte sink.
+pub fn emit_app_root_module<W: Write>(
+ imports_str: &str,
+ dynamic_imports_str: &str,
+ custom_code_str: &str,
+ hooks_str: &str,
+ render_str: &str,
+ import_window_libraries: &str,
+ window_imports_str: &str,
+ w: &mut W,
+) -> io::Result<()> {
+ w.write_all(b"\n")?;
+ w.write_all(imports_str.as_bytes())?;
+ w.write_all(b"\n")?;
+ w.write_all(dynamic_imports_str.as_bytes())?;
+ w.write_all(
+ b"\nimport { EventLoopProvider, StateProvider, defaultColorMode } from \"$/utils/context\";\n",
+ )?;
+ w.write_all(b"import { ThemeProvider } from '$/utils/react-theme';\n")?;
+ w.write_all(b"import { Layout as AppLayout } from './_document';\n")?;
+ w.write_all(b"import { Outlet } from 'react-router';\n")?;
+ w.write_all(import_window_libraries.as_bytes())?;
+ w.write_all(b"\n\n")?;
+ w.write_all(custom_code_str.as_bytes())?;
+ w.write_all(b"\n\nfunction ReflexProviders({children}) {\n")?;
+ w.write_all(b" useEffect(() => {\n")?;
+ w.write_all(b" // Make contexts and state objects available globally for dynamic eval'd components\n")?;
+ w.write_all(b" let windowImports = {\n ")?;
+ w.write_all(window_imports_str.as_bytes())?;
+ w.write_all(b"\n };\n window[\"__reflex\"] = windowImports;\n }, []);\n\n")?;
+ w.write_all(
+ b" return jsx(ThemeProvider, {defaultTheme: defaultColorMode, attribute: \"class\"},\n",
+ )?;
+ w.write_all(b" jsx(StateProvider, {},\n jsx(EventLoopProvider, {},\n jsx(AppWrap, {}, children)\n )\n )\n );\n}\n\n\n")?;
+ w.write_all(b"function AppWrap({children}) {\n")?;
+ w.write_all(hooks_str.as_bytes())?;
+ w.write_all(b"\nreturn (")?;
+ w.write_all(render_str.as_bytes())?;
+ w.write_all(b")\n}\n\n")?;
+ w.write_all(b"export function Layout({children}) {\n")?;
+ w.write_all(b" return jsx(AppLayout, {}, jsx(ReflexProviders, {}, children));\n")?;
+ w.write_all(b"}\n\n")?;
+ w.write_all(b"// Used by entry.client.js when mount_target is configured: skips the document\n")?;
+ w.write_all(b"// shell (which renders react-router's <Meta>/<Scripts>/<Links> and requires a\n")?;
+ w.write_all(b"// framework router context) but keeps the runtime providers.\n")?;
+ w.write_all(b"export function EmbedLayout({children}) {\n")?;
+ w.write_all(b" return jsx(ReflexProviders, {}, children);\n")?;
+ w.write_all(b"}\n\n")?;
+ w.write_all(b"export default function App() {\n return jsx(Outlet, {});\n}\n\n")?;
+ Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ fn render<F>(f: F) -> String
+ where
+ F: FnOnce(&mut Vec<u8>) -> io::Result<()>,
+ {
+ let mut buf = Vec::new();
+ f(&mut buf).unwrap();
+ String::from_utf8(buf).unwrap()
+ }
+
+ #[test]
+ fn includes_react_router_outlet_default() {
+ let out = render(|w| emit_app_root_module("", "", "", "", "null", "", "", w));
+ assert!(out.contains("export default function App()"));
+ assert!(out.contains("return jsx(Outlet, {});"));
+ }
+
+ #[test]
+ fn splices_render_string_into_appwrap() {
+ let out = render(|w| {
+ emit_app_root_module(
+ "import {Foo} from \"bar\";",
+ "",
+ "// custom",
+ " // hooks",
+ "jsx(MyApp, {})",
+ "",
+ "",
+ w,
+ )
+ });
+ assert!(out.contains("import {Foo} from \"bar\";"));
+ assert!(out.contains("// custom"));
+ assert!(out.contains("// hooks"));
+ assert!(out.contains("return (jsx(MyApp, {}))"));
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/buffer.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/buffer.rs
new file mode 100644
index 00000000000..794315f147e
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/buffer.rs
@@ -0,0 +1,168 @@
+//! Output buffer. Single growable `Vec<u8>` per emit (R6).
+//!
+//! The buffer is allocated upfront with a capacity hint from the IR size
+//! estimate (caller-supplied). Every `write_*` method appends raw bytes —
+//! there are no per-node `format!` or `String::new()` allocations.
+
+use std::fmt;
+
+pub struct CodeBuffer {
+ buf: Vec<u8>,
+}
+
+impl CodeBuffer {
+ #[inline]
+ pub fn new() -> Self {
+ Self { buf: Vec::new() }
+ }
+
+ #[inline]
+ pub fn with_capacity(cap: usize) -> Self {
+ Self {
+ buf: Vec::with_capacity(cap),
+ }
+ }
+
+ #[inline(always)]
+ pub fn write_byte(&mut self, b: u8) {
+ self.buf.push(b);
+ }
+
+ #[inline(always)]
+ pub fn write_bytes(&mut self, bytes: &[u8]) {
+ self.buf.extend_from_slice(bytes);
+ }
+
+ #[inline(always)]
+ pub fn write_str(&mut self, s: &str) {
+ self.buf.extend_from_slice(s.as_bytes());
+ }
+
+ /// Emit a JS string literal with double quotes. Escapes the few JS-special
+ /// characters; assumes input is otherwise already-encoded JS source.
+ pub fn write_js_string(&mut self, s: &str) {
+ self.buf.push(b'"');
+ for &b in s.as_bytes() {
+ match b {
+ b'"' => self.buf.extend_from_slice(b"\\\""),
+ b'\\' => self.buf.extend_from_slice(b"\\\\"),
+ b'\n' => self.buf.extend_from_slice(b"\\n"),
+ b'\r' => self.buf.extend_from_slice(b"\\r"),
+ b'\t' => self.buf.extend_from_slice(b"\\t"),
+ 0x00..=0x1F => {
+ self.buf.extend_from_slice(b"\\u00");
+ self.buf.push(hex_nibble(b >> 4));
+ self.buf.push(hex_nibble(b & 0x0F));
+ }
+ _ => self.buf.push(b),
+ }
+ }
+ self.buf.push(b'"');
+ }
+
+ /// Append a decimal integer.
+ pub fn write_u64(&mut self, n: u64) {
+ let mut tmp = itoa::Buffer::new();
+ self.buf.extend_from_slice(tmp.format(n).as_bytes());
+ }
+
+ pub fn write_i64(&mut self, n: i64) {
+ let mut tmp = itoa::Buffer::new();
+ self.buf.extend_from_slice(tmp.format(n).as_bytes());
+ }
+
+ pub fn write_f64(&mut self, n: f64) {
+ let mut tmp = ryu::Buffer::new();
+ self.buf.extend_from_slice(tmp.format(n).as_bytes());
+ }
+
+ #[inline]
+ pub fn len(&self) -> usize {
+ self.buf.len()
+ }
+
+ #[inline]
+ pub fn is_empty(&self) -> bool {
+ self.buf.is_empty()
+ }
+
+ #[inline]
+ pub fn as_bytes(&self) -> &[u8] {
+ &self.buf
+ }
+
+ pub fn into_bytes(self) -> Vec<u8> {
+ self.buf
+ }
+
+ pub fn as_str(&self) -> &str {
+ // All `write_*` paths emit UTF-8 bytes (we accept `&str` inputs and
+ // never split multi-byte sequences). If a caller writes raw bytes
+ // that aren't valid UTF-8, this will panic — that's a programmer
+ // error in codegen, not user input.
+ std::str::from_utf8(&self.buf).expect("CodeBuffer must contain UTF-8")
+ }
+}
+
+impl Default for CodeBuffer {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl fmt::Debug for CodeBuffer {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("CodeBuffer")
+ .field("len", &self.buf.len())
+ .finish()
+ }
+}
+
+#[inline(always)]
+fn hex_nibble(n: u8) -> u8 {
+ match n {
+ 0..=9 => b'0' + n,
+ 10..=15 => b'a' + (n - 10),
+ _ => unreachable!(),
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn writes_string_unescaped_when_safe() {
+ let mut b = CodeBuffer::new();
+ b.write_js_string("hello world");
+ assert_eq!(b.as_str(), "\"hello world\"");
+ }
+
+ #[test]
+ fn escapes_double_quotes() {
+ let mut b = CodeBuffer::new();
+ b.write_js_string(r#"say "hi""#);
+ assert_eq!(b.as_str(), r#""say \"hi\"""#);
+ }
+
+ #[test]
+ fn escapes_newlines() {
+ let mut b = CodeBuffer::new();
+ b.write_js_string("a\nb");
+ assert_eq!(b.as_str(), r#""a\nb""#);
+ }
+
+ #[test]
+ fn writes_decimal_int() {
+ let mut b = CodeBuffer::new();
+ b.write_u64(12345);
+ assert_eq!(b.as_str(), "12345");
+ }
+
+ #[test]
+ fn writes_negative_int() {
+ let mut b = CodeBuffer::new();
+ b.write_i64(-42);
+ assert_eq!(b.as_str(), "-42");
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/context.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/context.rs
new file mode 100644
index 00000000000..9d2cfc56e07
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/context.rs
@@ -0,0 +1,119 @@
+//! Context file emission: the JS shell that wraps the Python-computed
+//! initial state JSON and client-storage config. See plan §4.3, D10.
+//!
+//! The shape (verbatim Reflex convention):
+//!
+//! ```js
+//! import { createContext } from "react";
+//!
+//! export const StateContext = createContext(null);
+//! export const ColorModeContext = createContext(null);
+//!
+//! export const initialState = <initial_state_json>;
+//! export const clientStorage = <client_storage_json>;
+//! export const computedVarDeps = {<var>: [<dep>, ...], ...};
+//! ```
+//!
+//! State *values* come from Python (Pydantic + async resolution); Rust just
+//! emits the JS shell that splices them in. Rust never inspects the JSON.
+
+use reflex_intern::resolve_unchecked;
+use reflex_ir::GlobalState;
+
+use crate::buffer::CodeBuffer;
+
+pub fn emit_context(buf: &mut CodeBuffer, state: &GlobalState<'_>) {
+ buf.write_str("import { createContext } from \"react\";\n\n");
+ buf.write_str("export const StateContext = createContext(null);\n");
+ buf.write_str("export const ColorModeContext = createContext(null);\n\n");
+
+ buf.write_str("export const initialState = ");
+ write_json_blob(buf, state.initial_state_json);
+ buf.write_str(";\n");
+
+ buf.write_str("export const clientStorage = ");
+ write_json_blob(buf, state.client_storage_json);
+ buf.write_str(";\n");
+
+ buf.write_str("export const computedVarDeps = {");
+ for (i, dep) in state.computed_var_deps.iter().enumerate() {
+ if i > 0 {
+ buf.write_str(", ");
+ }
+ buf.write_js_string(resolve_unchecked(dep.var));
+ buf.write_str(": [");
+ for (j, depend) in dep.depends_on.iter().enumerate() {
+ if j > 0 {
+ buf.write_str(", ");
+ }
+ buf.write_js_string(resolve_unchecked(*depend));
+ }
+ buf.write_str("]");
+ }
+ buf.write_str("};\n");
+}
+
+/// Write a pre-encoded JSON blob. If the blob isn't valid UTF-8 we fall back
+/// to `null` — that means the Python side shipped garbage, which is a
+/// programmer error, but we don't want to crash the emit pipeline.
+fn write_json_blob(buf: &mut CodeBuffer, blob: &[u8]) {
+ match std::str::from_utf8(blob) {
+ Ok(s) if !s.is_empty() => buf.write_str(s),
+ _ => buf.write_str("null"),
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_ir::{ComputedVarDep, GlobalState};
+
+ #[test]
+ fn emits_basic_shell() {
+ let state = GlobalState {
+ schema_version: 1,
+ initial_state_json: b"{\"count\": 0}",
+ client_storage_json: b"{}",
+ computed_var_deps: &[],
+ };
+ let mut buf = CodeBuffer::new();
+ emit_context(&mut buf, &state);
+ let s = buf.as_str();
+ assert!(s.contains("import { createContext } from \"react\";"));
+ assert!(s.contains("export const initialState = {\"count\": 0};"));
+ assert!(s.contains("export const clientStorage = {};"));
+ assert!(s.contains("export const computedVarDeps = {};"));
+ }
+
+ #[test]
+ fn empty_json_emits_null() {
+ let state = GlobalState {
+ schema_version: 1,
+ initial_state_json: b"",
+ client_storage_json: b"",
+ computed_var_deps: &[],
+ };
+ let mut buf = CodeBuffer::new();
+ emit_context(&mut buf, &state);
+ let s = buf.as_str();
+ assert!(s.contains("export const initialState = null;"));
+ }
+
+ #[test]
+ fn emits_computed_var_deps() {
+ let dep = ComputedVarDep {
+ var: reflex_intern::intern("total"),
+ depends_on: &[reflex_intern::intern("a"), reflex_intern::intern("b")],
+ };
+ let state = GlobalState {
+ schema_version: 1,
+ initial_state_json: b"null",
+ client_storage_json: b"null",
+ computed_var_deps: std::slice::from_ref(&dep),
+ };
+ let mut buf = CodeBuffer::new();
+ emit_context(&mut buf, &state);
+ let s = buf.as_str();
+ assert!(s.contains("\"total\": [\"a\", \"b\"]"));
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/context_module.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/context_module.rs
new file mode 100644
index 00000000000..5601152c734
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/context_module.rs
@@ -0,0 +1,324 @@
+//! Port of `context_template` —
+//! `packages/reflex-base/src/reflex_base/compiler/templates.py`.
+//!
+//! The legacy template takes the resolved state hierarchy + client-
+//! storage config and emits the full `utils/context.js` module. We
+//! port the static template assembly to Rust; the dynamic inputs
+//! (initial-state JSON, client-storage JSON, default-color-mode JS
+//! literal) are pre-serialized by the Python caller and spliced in
+//! verbatim.
+//!
+//! Streams output through a `Write` so the PyO3 binding can drive a
+//! `BufWriter<File>` and skip any intermediate `String` allocation.
+
+use std::io::{self, Write};
+
+/// Hardcoded constants from
+/// `reflex_base.constants.compiler.CompileVars`. They're
+/// implementation-defined and never change at runtime, so we keep them
+/// in Rust instead of marshalling them across PyO3 every call.
+const FRONTEND_EXCEPTION_STATE_FULL: &str =
+ "reflex___state____state.reflex___state____frontend_event_exception_state";
+const UPDATE_VARS_INTERNAL: &str =
+ "reflex___state____update_vars_internal_state.update_vars_internal";
+const ON_LOAD_INTERNAL: &str = "reflex___state____on_load_internal_state.on_load_internal";
+const HYDRATE: &str = "hydrate";
+
+/// Emit `.web/utils/context.js`.
+///
+/// Args:
+/// is_dev_mode: emitted as `isDevMode = <bool>`.
+/// default_color_mode_js: JS expression for the default color mode
+/// — the legacy emitter passes either a quoted string like
+/// `"system"` or the literal `"system"`, depending on app
+/// config. Passed verbatim.
+/// state_name: the root state's full dotted name (e.g.
+/// `reflex___state____state`). `None` produces the no-state
+/// fallback (`onLoadInternalEvent = () => []`).
+/// state_keys: the state names whose contexts and stores we wire up.
+/// Each gets `replace('.', '__')` applied for its JS identifier.
+/// initial_state_json: the JSON-serialized initial state dict,
+/// already produced by the Python caller via `json_dumps`.
+/// If `state_keys` is empty this is normally `"{}"`.
+/// client_storage_json: the JSON-serialized client storage config,
+/// already produced by `json.dumps` (or `"{}"` if `None`).
+/// w: byte sink.
+pub fn emit_context_module<W: Write>(
+ is_dev_mode: bool,
+ default_color_mode_js: &str,
+ state_name: Option<&str>,
+ state_keys: &[&str],
+ initial_state_json: &str,
+ client_storage_json: &str,
+ w: &mut W,
+) -> io::Result<()> {
+ // Header — imports + top-level constants.
+ w.write_all(
+ b"import { createContext, useContext, useMemo, useReducer, useState, createElement, useEffect } from \"react\"\n",
+ )?;
+ w.write_all(
+ b"import { applyDelta, ReflexEvent, hydrateClientStorage, useEventLoop, refs } from \"$/utils/state\"\n",
+ )?;
+ w.write_all(b"import { jsx } from \"@emotion/react\";\n\n")?;
+
+ // `export const initialState = { … }` — pre-serialized by Python.
+ w.write_all(b"export const initialState = ")?;
+ w.write_all(initial_state_json.as_bytes())?;
+ w.write_all(b"\n\n")?;
+
+ w.write_all(b"export const defaultColorMode = ")?;
+ w.write_all(default_color_mode_js.as_bytes())?;
+ w.write_all(
+ b"\nexport const ColorModeContext = createContext({\n \
+ colorMode: defaultColorMode,\n \
+ resolvedColorMode: defaultColorMode === \"dark\" ? \"dark\" : \"light\",\n \
+ toggleColorMode: () => {},\n \
+ setColorMode: () => {},\n\
+ });\n",
+ )?;
+ w.write_all(b"export const UploadFilesContext = createContext(null);\n")?;
+ w.write_all(b"export const DispatchContext = createContext(null);\n")?;
+
+ // `StateContexts = { foo: createContext(null), bar: ... };` —
+ // concatenated with NO separator (matches the legacy template's
+ // ''.join with each entry ending in ',').
+ w.write_all(b"export const StateContexts = {")?;
+ for key in state_keys {
+ write_formatted_state_name(w, key)?;
+ w.write_all(b": createContext(null),")?;
+ }
+ w.write_all(b"};\n")?;
+
+ w.write_all(b"export const EventLoopContext = createContext(null);\n")?;
+ w.write_all(b"export const clientStorage = ")?;
+ w.write_all(client_storage_json.as_bytes())?;
+ w.write_all(b"\n\n")?;
+
+ // State block: either the rich version when a state root exists, or
+ // a no-op fallback. Mirrors the conditional in the legacy template.
+ match state_name {
+ Some(sn) => emit_state_block_with_state(w, sn)?,
+ None => emit_state_block_no_state(w)?,
+ }
+ // Legacy template puts an empty line between the state block (which
+ // already ends with `\n `) and the next `export`. That collapses
+ // to `\n\n` after substitution.
+ w.write_all(b"\n\n")?;
+
+ w.write_all(b"export const isDevMode = ")?;
+ w.write_all(if is_dev_mode { b"true" } else { b"false" })?;
+ w.write_all(b";\n\n")?;
+
+ // Trailing static helpers — providers + ClientSide wrapper.
+ w.write_all(STATIC_PROVIDERS_PRELUDE)?;
+
+ // `StateProvider` body — useReducer per state, dispatchers,
+ // nested createElement scaffolding. Empty state_keys produces the
+ // legacy empty-string output (the `\n`.join over an empty list).
+ w.write_all(b"export function StateProvider({ children }) {\n ")?;
+ let mut first_store = true;
+ for key in state_keys {
+ if !first_store {
+ w.write_all(b"\n")?;
+ }
+ first_store = false;
+ w.write_all(b"const [")?;
+ write_formatted_state_name(w, key)?;
+ w.write_all(b", dispatch_")?;
+ write_formatted_state_name(w, key)?;
+ w.write_all(b"] = useReducer(applyDelta, initialState[\"")?;
+ w.write_all(key.as_bytes())?;
+ w.write_all(b"\"])")?;
+ }
+ w.write_all(b"\n const dispatchers = useMemo(() => {\n return {\n ")?;
+ let mut first_disp = true;
+ for key in state_keys {
+ if !first_disp {
+ w.write_all(b"\n")?;
+ }
+ first_disp = false;
+ w.write_all(b"\"")?;
+ w.write_all(key.as_bytes())?;
+ w.write_all(b"\": dispatch_")?;
+ write_formatted_state_name(w, key)?;
+ w.write_all(b",")?;
+ }
+ w.write_all(b"\n }\n }, [])\n\n return (\n ")?;
+
+ let mut first_ctx = true;
+ for key in state_keys {
+ if !first_ctx {
+ w.write_all(b"\n")?;
+ }
+ first_ctx = false;
+ w.write_all(b"createElement(StateContexts.")?;
+ write_formatted_state_name(w, key)?;
+ w.write_all(b",{value: ")?;
+ write_formatted_state_name(w, key)?;
+ w.write_all(b"},")?;
+ }
+ w.write_all(b"\n createElement(DispatchContext, {value: dispatchers}, children)\n ")?;
+ for _ in 0..state_keys.len() {
+ w.write_all(b")")?;
+ }
+ w.write_all(b"\n )\n}")?;
+ Ok(())
+}
+
+/// Write a state name with dots replaced by double-underscore so it's
+/// a valid JS identifier (matching `format_state_name` in
+/// `reflex_base.utils.format`).
+fn write_formatted_state_name<W: Write>(w: &mut W, name: &str) -> io::Result<()> {
+ // Hot path: search for a dot before doing per-byte work.
+ if !name.contains('.') {
+ return w.write_all(name.as_bytes());
+ }
+ for b in name.bytes() {
+ if b == b'.' {
+ w.write_all(b"__")?;
+ } else {
+ w.write_all(std::slice::from_ref(&b))?;
+ }
+ }
+ Ok(())
+}
+
+/// Emit the rich state block — populated when the app has a state root.
+fn emit_state_block_with_state<W: Write>(w: &mut W, state_name: &str) -> io::Result<()> {
+ w.write_all(b"\nexport const state_name = \"")?;
+ w.write_all(state_name.as_bytes())?;
+ w.write_all(b"\"\n\nexport const exception_state_name = \"")?;
+ w.write_all(FRONTEND_EXCEPTION_STATE_FULL.as_bytes())?;
+ w.write_all(b"\"\n\n")?;
+ w.write_all(b"// These events are triggered on initial load and each page navigation.\n")?;
+ w.write_all(b"export const onLoadInternalEvent = () => {\n")?;
+ w.write_all(b" const internal_events = [];\n\n")?;
+ w.write_all(b" // Get tracked cookie and local storage vars to send to the backend.\n")?;
+ w.write_all(b" const client_storage_vars = hydrateClientStorage(clientStorage);\n")?;
+ w.write_all(b" // But only send the vars if any are actually set in the browser.\n")?;
+ w.write_all(b" if (client_storage_vars && Object.keys(client_storage_vars).length !== 0) {\n")?;
+ w.write_all(b" internal_events.push(\n")?;
+ w.write_all(b" ReflexEvent(\n")?;
+ w.write_all(b" '")?;
+ w.write_all(state_name.as_bytes())?;
+ w.write_all(b".")?;
+ w.write_all(UPDATE_VARS_INTERNAL.as_bytes())?;
+ w.write_all(b"',\n")?;
+ w.write_all(b" {vars: client_storage_vars},\n")?;
+ w.write_all(b" ),\n")?;
+ w.write_all(b" );\n }\n\n")?;
+ w.write_all(b" // `on_load_internal` triggers the correct on_load event(s) for the current page.\n")?;
+ w.write_all(b" // If the page does not define any on_load event, this will just set `is_hydrated = true`.\n")?;
+ w.write_all(b" internal_events.push(ReflexEvent('")?;
+ w.write_all(state_name.as_bytes())?;
+ w.write_all(b".")?;
+ w.write_all(ON_LOAD_INTERNAL.as_bytes())?;
+ w.write_all(b"'));\n\n return internal_events;\n}\n\n")?;
+ w.write_all(b"// The following events are sent when the websocket connects or reconnects.\n")?;
+ w.write_all(b"export const initialEvents = () => [\n ReflexEvent('")?;
+ w.write_all(state_name.as_bytes())?;
+ w.write_all(b".")?;
+ w.write_all(HYDRATE.as_bytes())?;
+ w.write_all(b"'),\n ...onLoadInternalEvent()\n]\n ")?;
+ Ok(())
+}
+
+/// Emit the no-state fallback block.
+fn emit_state_block_no_state<W: Write>(w: &mut W) -> io::Result<()> {
+ w.write_all(
+ b"\nexport const state_name = undefined\n\n\
+ export const exception_state_name = undefined\n\n\
+ export const onLoadInternalEvent = () => []\n\n\
+ export const initialEvents = () => []\n",
+ )
+}
+
+const STATIC_PROVIDERS_PRELUDE: &[u8] = b"export function UploadFilesProvider({ children }) {\n \
+const [filesById, setFilesById] = useState({})\n \
+refs[\"__clear_selected_files\"] = (id) => setFilesById(filesById => {\n \
+const newFilesById = {...filesById}\n \
+delete newFilesById[id]\n \
+return newFilesById\n })\n \
+return createElement(\n \
+UploadFilesContext.Provider,\n \
+{ value: [filesById, setFilesById] },\n \
+children\n );\n}\n\n\
+export function ClientSide(component) {\n \
+return ({ children, ...props }) => {\n \
+const [Component, setComponent] = useState(null);\n \
+useEffect(() => {\n \
+async function load() {\n \
+const comp = await component();\n \
+setComponent(() => comp);\n }\n \
+load();\n }, []);\n \
+return Component ? jsx(Component, props, children) : null;\n };\n}\n\n\
+export function EventLoopProvider({ children }) {\n \
+const dispatch = useContext(DispatchContext)\n \
+const [addEvents, connectErrors] = useEventLoop(\n \
+dispatch,\n \
+initialEvents,\n \
+clientStorage,\n )\n \
+return createElement(\n \
+EventLoopContext.Provider,\n \
+{ value: [addEvents, connectErrors] },\n \
+children\n );\n}\n\n";
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ fn render<F>(f: F) -> String
+ where
+ F: FnOnce(&mut Vec<u8>) -> io::Result<()>,
+ {
+ let mut buf = Vec::new();
+ f(&mut buf).unwrap();
+ String::from_utf8(buf).unwrap()
+ }
+
+ #[test]
+ fn format_state_name_replaces_dots() {
+ let s = render(|w| write_formatted_state_name(w, "foo.bar.baz"));
+ assert_eq!(s, "foo__bar__baz");
+ }
+
+ #[test]
+ fn format_state_name_passthrough_when_no_dot() {
+ let s = render(|w| write_formatted_state_name(w, "foo"));
+ assert_eq!(s, "foo");
+ }
+
+ #[test]
+ fn no_state_block_emits_undefined_fallbacks() {
+ let s = render(|w| {
+ emit_context_module(false, "\"system\"", None, &[], "{}", "{}", w)
+ });
+ assert!(s.contains("export const state_name = undefined"));
+ assert!(s.contains("export const initialEvents = () => []"));
+ assert!(s.contains("export const StateContexts = {};"));
+ }
+
+ #[test]
+ fn with_state_emits_hydrate_event_path() {
+ let s = render(|w| {
+ emit_context_module(
+ true,
+ "\"system\"",
+ Some("reflex___state____state"),
+ &["reflex___state____state"],
+ "{}",
+ "{}",
+ w,
+ )
+ });
+ assert!(s.contains("export const isDevMode = true;"));
+ assert!(
+ s.contains("ReflexEvent('reflex___state____state.hydrate')"),
+ "hydrate event missing:\n{s}"
+ );
+ assert!(
+ s.contains("StateContexts.reflex___state____state"),
+ "state context missing:\n{s}"
+ );
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/diagnostic.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/diagnostic.rs
new file mode 100644
index 00000000000..947cb597b57
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/diagnostic.rs
@@ -0,0 +1,77 @@
+//! User-facing diagnostics. See plan §4.6.
+//!
+//! A `Diagnostic` is the framework's structured error type: a severity,
+//! a short message, a (file, line, col) location pulled from the IR's
+//! `SourceLoc`, and optionally a longer help message. The struct mirrors
+//! the data `miette` expects when rendering — we keep it deliberately small
+//! and dependency-light because PyO3 has to ferry it back to Python where
+//! `miette` itself isn't available.
+//!
+//! Once the consumer is happy with the structured form we can wire
+//! `miette::Diagnostic` in a separate crate to render terminal-style spans.
+
+use reflex_ir::SourceLoc;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Severity {
+ Error,
+ Warning,
+ Note,
+}
+
+#[derive(Debug, Clone)]
+pub struct Diagnostic {
+ pub severity: Severity,
+ pub code: &'static str,
+ pub message: String,
+ pub source_loc: SourceLoc,
+ pub help: Option<String>,
+}
+
+impl Diagnostic {
+ pub fn error(code: &'static str, message: impl Into<String>, loc: SourceLoc) -> Self {
+ Self {
+ severity: Severity::Error,
+ code,
+ message: message.into(),
+ source_loc: loc,
+ help: None,
+ }
+ }
+
+ pub fn warning(code: &'static str, message: impl Into<String>, loc: SourceLoc) -> Self {
+ Self {
+ severity: Severity::Warning,
+ code,
+ message: message.into(),
+ source_loc: loc,
+ help: None,
+ }
+ }
+
+ pub fn with_help(mut self, help: impl Into<String>) -> Self {
+ self.help = Some(help.into());
+ self
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_ir::PyFileId;
+
+ #[test]
+ fn error_builder() {
+ let d = Diagnostic::error(
+ "E001",
+ "unknown tag",
+ SourceLoc { file: PyFileId(1), line: 10, col: 5 },
+ )
+ .with_help("try one of: div, span, p");
+ assert_eq!(d.severity, Severity::Error);
+ assert_eq!(d.code, "E001");
+ assert_eq!(d.message, "unknown tag");
+ assert_eq!(d.source_loc.line, 10);
+ assert_eq!(d.help.unwrap(), "try one of: div, span, p");
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/document_root_module.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/document_root_module.rs
new file mode 100644
index 00000000000..b33f7505093
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/document_root_module.rs
@@ -0,0 +1,53 @@
+//! Port of `document_root_template` (the legacy `.web/app/_document.js`
+//! emitter).
+//!
+//! The document root provides React-Router's `<html>` / `<head>` /
+//! `<body>` shell. The legacy template takes a pre-computed imports
+//! list and a render dict; Phase-1 port has Python render both to
+//! strings and Rust splice them into the layout fn.
+
+use std::io::{self, Write};
+
+/// Emit `.web/app/_document.js`.
+///
+/// Mirrors `document_root_template` in
+/// `packages/reflex-base/src/reflex_base/compiler/templates.py`.
+///
+/// Args:
+/// imports_str: rendered `import { … } from "…"` lines joined with
+/// `\n` by the caller.
+/// document_render_str: rendered JSX expression for the document
+/// tree — splices verbatim into `return (…)`.
+/// w: byte sink.
+pub fn emit_document_root_module<W: Write>(
+ imports_str: &str,
+ document_render_str: &str,
+ w: &mut W,
+) -> io::Result<()> {
+ w.write_all(imports_str.as_bytes())?;
+ w.write_all(b"\n\nexport function Layout({children}) {\n return (\n ")?;
+ w.write_all(document_render_str.as_bytes())?;
+ w.write_all(b"\n )\n}")?;
+ Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn assembles_layout_with_render() {
+ let mut buf = Vec::new();
+ emit_document_root_module(
+ "import { Foo } from \"bar\";",
+ "jsx(Foo, {}, children)",
+ &mut buf,
+ )
+ .unwrap();
+ let out = String::from_utf8(buf).unwrap();
+ assert_eq!(
+ out,
+ "import { Foo } from \"bar\";\n\nexport function Layout({children}) {\n return (\n jsx(Foo, {}, children)\n )\n}"
+ );
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/jsx.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/jsx.rs
new file mode 100644
index 00000000000..aa8b5f9f672
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/jsx.rs
@@ -0,0 +1,324 @@
+//! JSX emission for the Component tree. See plan §4.8.
+//!
+//! `emit_component(buf, component)` writes one JS expression that, when
+//! evaluated, produces the React element described by the IR node.
+//!
+//! Source-map variant: every entry point has a `_with_map` sibling that
+//! records `(byte_offset → SourceLoc)` tuples for back-mapping diagnostics.
+
+use reflex_intern::resolve_unchecked;
+use reflex_ir::{Component, EventHandler, Literal, MatchArm, Value};
+
+use crate::buffer::CodeBuffer;
+use crate::sourcemap::SourceMap;
+
+/// Emit one Component as a JS expression (no source-map recording).
+#[inline]
+pub fn emit_component<'a>(buf: &mut CodeBuffer, component: &Component<'a>) {
+ emit_component_with_map(buf, component, None)
+}
+
+/// Emit one Component as a JS expression. If `map` is `Some`, records the
+/// byte offset of this node and threads the recorder through children.
+pub fn emit_component_with_map<'a>(
+ buf: &mut CodeBuffer,
+ component: &Component<'a>,
+ map: Option<&mut SourceMap>,
+) {
+ let offset = buf.len() as u32;
+ let loc = component.source_loc();
+ match map {
+ Some(map) => {
+ map.record(offset, loc);
+ emit_component_inner(buf, component, Some(map));
+ }
+ None => {
+ emit_component_inner(buf, component, None);
+ }
+ }
+}
+
+fn emit_component_inner<'a>(
+ buf: &mut CodeBuffer,
+ component: &Component<'a>,
+ map: Option<&mut SourceMap>,
+) {
+ match component {
+ Component::Element {
+ tag,
+ props,
+ children,
+ event_handlers,
+ ..
+ } => emit_element(buf, *tag, props, children, event_handlers, map),
+ Component::Text { value, .. } => buf.write_js_string(value),
+ Component::Foreach { iter, body, .. } => emit_foreach(buf, iter, body, map),
+ Component::Cond {
+ test, then, else_, ..
+ } => emit_cond(buf, test, then, *else_, map),
+ Component::Match {
+ value,
+ arms,
+ default,
+ ..
+ } => emit_match(buf, value, arms, *default, map),
+ Component::Memoize { inner, key, .. } => emit_memoize(buf, inner, key.0, map),
+ Component::Fragment { children, .. } => emit_fragment(buf, children, map),
+ Component::Expr { value, .. } => emit_value(buf, value),
+ }
+}
+
+fn emit_element<'a>(
+ buf: &mut CodeBuffer,
+ tag: reflex_intern::Symbol,
+ props: &'a [(reflex_intern::Symbol, Value<'a>)],
+ children: &'a [Component<'a>],
+ event_handlers: &'a [EventHandler<'a>],
+ mut map: Option<&mut SourceMap>,
+) {
+ buf.write_str("jsx(");
+ buf.write_str(resolve_unchecked(tag));
+ buf.write_str(", {");
+ let mut first = true;
+ for (name, value) in props {
+ if !first {
+ buf.write_str(", ");
+ }
+ first = false;
+ emit_prop_name(buf, *name);
+ buf.write_str(": ");
+ emit_value(buf, value);
+ }
+ for handler in event_handlers {
+ if !first {
+ buf.write_str(", ");
+ }
+ first = false;
+ emit_prop_name(buf, handler.trigger);
+ buf.write_str(": ");
+ buf.write_str(handler.expr);
+ }
+ buf.write_str("}");
+ for child in children {
+ buf.write_str(", ");
+ emit_component_with_map(buf, child, map.as_deref_mut());
+ }
+ buf.write_str(")");
+}
+
+fn emit_fragment<'a>(
+ buf: &mut CodeBuffer,
+ children: &'a [Component<'a>],
+ mut map: Option<&mut SourceMap>,
+) {
+ buf.write_str("jsx(Fragment, {}");
+ for child in children {
+ buf.write_str(", ");
+ emit_component_with_map(buf, child, map.as_deref_mut());
+ }
+ buf.write_str(")");
+}
+
+fn emit_foreach<'a>(
+ buf: &mut CodeBuffer,
+ iter: &Value<'a>,
+ body: &Component<'a>,
+ map: Option<&mut SourceMap>,
+) {
+ buf.write_str("(");
+ emit_value(buf, iter);
+ buf.write_str(").map((item, index) => ");
+ emit_component_with_map(buf, body, map);
+ buf.write_str(")");
+}
+
+fn emit_cond<'a>(
+ buf: &mut CodeBuffer,
+ test: &Value<'a>,
+ then: &Component<'a>,
+ else_: Option<&Component<'a>>,
+ mut map: Option<&mut SourceMap>,
+) {
+ buf.write_str("((");
+ emit_value(buf, test);
+ buf.write_str(") ? ");
+ emit_component_with_map(buf, then, map.as_deref_mut());
+ buf.write_str(" : ");
+ if let Some(e) = else_ {
+ emit_component_with_map(buf, e, map);
+ } else {
+ buf.write_str("null");
+ }
+ buf.write_str(")");
+}
+
+fn emit_match<'a>(
+ buf: &mut CodeBuffer,
+ value: &Value<'a>,
+ arms: &'a [MatchArm<'a>],
+ default: Option<&Component<'a>>,
+ mut map: Option<&mut SourceMap>,
+) {
+ buf.write_str("match_template((");
+ emit_value(buf, value);
+ buf.write_str("), [");
+ for (i, arm) in arms.iter().enumerate() {
+ if i > 0 {
+ buf.write_str(", ");
+ }
+ buf.write_str("[");
+ emit_value(buf, &arm.case);
+ buf.write_str(", ");
+ emit_component_with_map(buf, arm.body, map.as_deref_mut());
+ buf.write_str("]");
+ }
+ buf.write_str("], ");
+ if let Some(d) = default {
+ emit_component_with_map(buf, d, map);
+ } else {
+ buf.write_str("null");
+ }
+ buf.write_str(")");
+}
+
+fn emit_memoize<'a>(
+ buf: &mut CodeBuffer,
+ inner: &Component<'a>,
+ key: u64,
+ map: Option<&mut SourceMap>,
+) {
+ buf.write_str("jsx(MemoWrapper, {key: \"");
+ buf.write_u64(key);
+ buf.write_str("\"}, ");
+ emit_component_with_map(buf, inner, map);
+ buf.write_str(")");
+}
+
+pub fn emit_value<'a>(buf: &mut CodeBuffer, value: &Value<'a>) {
+ match value {
+ Value::JsExpr { expr, .. } => buf.write_str(expr),
+ Value::Literal(lit) => emit_literal(buf, lit),
+ Value::Ref(sym) => buf.write_str(resolve_unchecked(*sym)),
+ }
+}
+
+fn emit_literal<'a>(buf: &mut CodeBuffer, lit: &Literal<'a>) {
+ match lit {
+ Literal::Null => buf.write_str("null"),
+ Literal::Bool(true) => buf.write_str("true"),
+ Literal::Bool(false) => buf.write_str("false"),
+ Literal::Int(n) => buf.write_i64(*n),
+ Literal::Float(f) => buf.write_f64(*f),
+ Literal::Str(s) => buf.write_js_string(s),
+ }
+}
+
+/// Prop names emit unquoted when they're valid JS identifiers; otherwise
+/// they emit as quoted string keys. Known Python-side names (snake_case
+/// HTML attributes, event triggers) are converted to camelCase so the
+/// emitted JSX matches what React expects.
+fn emit_prop_name(buf: &mut CodeBuffer, sym: reflex_intern::Symbol) {
+ let name = resolve_unchecked(sym);
+ // React props are camelCase. Reflex authors declare them in
+ // snake_case (Python convention); the legacy emitter runs every
+ // prop name through `to_camel_case`. Match that behaviour so
+ // ``remark_plugins`` → ``remarkPlugins`` etc.
+ if name.contains('_') && is_js_identifier(name) {
+ write_camel_case(buf, name);
+ return;
+ }
+ if is_js_identifier(name) {
+ buf.write_str(name);
+ } else {
+ buf.write_js_string(name);
+ }
+}
+
+/// Convert ``snake_case`` to ``camelCase``: lowercase the first segment
+/// and Title-case the rest. Mirrors
+/// :func:`reflex_base.utils.format.to_camel_case`. The legacy helper
+/// treats hyphens as underscores by default — but JS identifiers can't
+/// contain hyphens anyway, so `is_js_identifier` already excludes that
+/// case and we only need to handle ``_``.
+fn write_camel_case(buf: &mut CodeBuffer, name: &str) {
+ let mut after_underscore = false;
+ for (i, ch) in name.char_indices() {
+ if ch == '_' {
+ if i > 0 {
+ after_underscore = true;
+ }
+ continue;
+ }
+ if after_underscore {
+ // ASCII uppercase covers every JS-identifier byte we care
+ // about; non-ASCII passes through unchanged.
+ for upper in ch.to_uppercase() {
+ let mut tmp = [0; 4];
+ buf.write_str(upper.encode_utf8(&mut tmp));
+ }
+ after_underscore = false;
+ } else {
+ let mut tmp = [0; 4];
+ buf.write_str(ch.encode_utf8(&mut tmp));
+ }
+ }
+}
+
+fn is_js_identifier(s: &str) -> bool {
+ let bytes = s.as_bytes();
+ if bytes.is_empty() {
+ return false;
+ }
+ let first = bytes[0];
+ if !(first.is_ascii_alphabetic() || first == b'_' || first == b'$') {
+ return false;
+ }
+ for &b in &bytes[1..] {
+ if !(b.is_ascii_alphanumeric() || b == b'_' || b == b'$') {
+ return false;
+ }
+ }
+ true
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_arena::Arena;
+ use reflex_ir::{parse::test_helpers::tiny_page_bytes, parse_page};
+
+ #[test]
+ fn emits_tiny_page() {
+ let arena = Arena::new();
+ let bytes = tiny_page_bytes();
+ let page = parse_page(&arena, &bytes).unwrap();
+ let mut buf = CodeBuffer::new();
+ emit_component(&mut buf, page.root);
+ assert_eq!(buf.as_str(), "jsx(div, {id: x}, \"hello\")");
+ }
+
+ #[test]
+ fn js_identifier_recognition() {
+ assert!(is_js_identifier("foo"));
+ assert!(is_js_identifier("_x"));
+ assert!(is_js_identifier("$id"));
+ assert!(is_js_identifier("aria1"));
+ assert!(!is_js_identifier(""));
+ assert!(!is_js_identifier("1foo"));
+ assert!(!is_js_identifier("aria-label"));
+ assert!(!is_js_identifier("foo bar"));
+ }
+
+ #[test]
+ fn map_recording_is_a_noop_for_synthetic_locs() {
+ // The tiny page's nodes all use SourceLoc::SYNTHETIC, so the map
+ // stays empty even with `Some(&mut map)`.
+ let arena = Arena::new();
+ let bytes = tiny_page_bytes();
+ let page = parse_page(&arena, &bytes).unwrap();
+ let mut buf = CodeBuffer::new();
+ let mut map = SourceMap::new();
+ emit_component_with_map(&mut buf, page.root, Some(&mut map));
+ assert!(map.is_empty());
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/lib.rs
new file mode 100644
index 00000000000..8061fb6ee75
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/lib.rs
@@ -0,0 +1,37 @@
+//! IR → JS/JSX/CSS codegen. See plan §3, D8/D10, R6.
+//!
+//! All output goes through a single growable `CodeBuffer` (`Vec<u8>`). No
+//! intermediate `String`s, no `format!` in per-node paths — use `write_*`
+//! methods that append bytes directly.
+
+#![forbid(unsafe_code)]
+
+pub mod app_root;
+pub mod app_root_module;
+pub mod buffer;
+pub mod context;
+pub mod context_module;
+pub mod diagnostic;
+pub mod document_root_module;
+pub mod jsx;
+pub mod memo;
+pub mod page;
+pub mod sourcemap;
+pub mod static_artifacts;
+pub mod theme;
+pub mod vite;
+
+pub use app_root::emit_app_root;
+pub use app_root_module::emit_app_root_module;
+pub use buffer::CodeBuffer;
+pub use context::emit_context;
+pub use context_module::emit_context_module;
+pub use diagnostic::{Diagnostic, Severity};
+pub use document_root_module::emit_document_root_module;
+pub use jsx::{emit_component, emit_component_with_map, emit_value};
+pub use memo::{emit_memo_index, emit_memo_module};
+pub use page::{emit_page, emit_page_with_extras, emit_page_with_map};
+pub use sourcemap::SourceMap;
+pub use static_artifacts::{emit_stateful_pages_json, emit_styles_root, emit_theme_module};
+pub use theme::emit_theme;
+pub use vite::emit_vite_config;
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/memo.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/memo.rs
new file mode 100644
index 00000000000..e0e879e4273
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/memo.rs
@@ -0,0 +1,222 @@
+//! Emit a per-memo module — `export const <name> = memo(({children}) => …)`.
+//!
+//! Mirrors `packages/reflex-base/src/reflex_base/compiler/templates.py`'s
+//! `memo_single_component_template`. Most of the import + JSX-render
+//! plumbing is shared with `emit_page`; this module just swaps the page
+//! shell for the `memo(...)` shell.
+//!
+//! Used by phase 3 of the memoize port (plan §0b lever (b3)): once we've
+//! decided to wrap a Component, pyread builds an IR with the wrapped
+//! body (children replaced by a `{children}` placeholder expression),
+//! and this function emits the standalone memo module that the page
+//! module then imports.
+
+use reflex_intern::{intern, resolve_unchecked, Symbol};
+use reflex_ir::Page;
+
+use crate::buffer::CodeBuffer;
+use crate::jsx::emit_component_with_map;
+
+/// Baseline runtime aliases every memo module needs. `memo` from React
+/// plus `jsx` from Emotion — anything else the body refers to gets
+/// pulled in via the harvested `component_imports`.
+const MEMO_RUNTIME_IMPORTS: &[(&str, &str)] = &[
+ ("react", "memo"),
+ ("react", "useContext"),
+ ("react", "useRef"),
+ ("$/utils/context", "EventLoopContext"),
+ ("$/utils/context", "StateContexts"),
+ ("$/utils/state", "refs"),
+ ("$/utils/state", "ReflexEvent"),
+ ("@emotion/react", "jsx"),
+];
+
+/// Emit a memo wrapper module.
+///
+/// The `Page` IR is reused as the input shape because the body of a memo
+/// is structurally a single JSX tree — same as a page. Title / meta on
+/// `page` are ignored (memos don't carry document metadata); everything
+/// else flows through.
+///
+/// Args:
+/// buf: target buffer.
+/// page: the wrapper body's IR. Pyread builds this from the
+/// hole-substituted Component (`children = [Bare(Var("children"))]`).
+/// name: exported memo identifier (`export const <name> = …`).
+/// signature: parameter list spliced after `memo(`. Use `"{ children }"`
+/// for passthrough wrappers, `"()"` for snapshot bodies that don't
+/// receive children.
+/// pre_hooks: pre-rendered hook block (e.g. `const { resolvedColorMode }
+/// = useContext(ColorModeContext)`) the Python orchestrator harvested
+/// via `body._get_all_hooks()`. Spliced between the state-context
+/// hooks and `return` so memo bodies that reference hook-defined
+/// identifiers (color mode, custom `_get_hooks_internal`, etc.) get
+/// their declarations. Pass `""` if there are none.
+pub fn emit_memo_module(
+ buf: &mut CodeBuffer,
+ page: &Page<'_>,
+ name: &str,
+ signature: &str,
+ pre_hooks: &str,
+) {
+ emit_combined_imports(buf, page.component_imports);
+
+ buf.write_str("\nexport const ");
+ buf.write_str(name);
+ buf.write_str(" = memo(");
+ buf.write_str(signature);
+ buf.write_str(" => {\n");
+
+ if page.needs_ref {
+ buf.write_str(
+ " const ref_root = useRef(null); refs[\"ref_root\"] = ref_root;\n",
+ );
+ }
+ for binding in page.state_bindings {
+ let s = resolve_unchecked(*binding);
+ buf.write_str(" const ");
+ buf.write_str(s);
+ buf.write_str(" = useContext(StateContexts.");
+ buf.write_str(s);
+ buf.write_str(");\n");
+ }
+ buf.write_str(
+ " const [addEvents, connectErrors] = useContext(EventLoopContext);\n",
+ );
+ if !pre_hooks.is_empty() {
+ buf.write_str(" ");
+ buf.write_str(pre_hooks);
+ if !pre_hooks.ends_with('\n') {
+ buf.write_str("\n");
+ }
+ }
+
+ buf.write_str(" return ");
+ emit_component_with_map(buf, page.root, None);
+ buf.write_str(";\n});\n");
+}
+
+/// Emit the memo index module — the small barrel file at
+/// `.web/utils/components.jsx` that re-exports every `@rx.memo` custom
+/// component so `root.jsx` can pull them in via `$/utils/components`.
+///
+/// Mirrors `memo_index_template` in
+/// `packages/reflex-base/src/reflex_base/compiler/templates.py`.
+///
+/// Streams output directly to `w` — no intermediate `String` is
+/// allocated. Tests pass a `&mut Vec<u8>`; the PyO3 binding passes a
+/// `BufWriter<File>` so bytes flow straight to disk.
+///
+/// Args:
+/// reexports: `(export_name, relative_module_specifier)` pairs. The
+/// specifier is the path component after `$/utils/` —
+/// e.g. `("Foo", "components/Foo")` produces
+/// `export { Foo } from "components/Foo";`.
+/// w: a writer the rendered module source is streamed into.
+pub fn emit_memo_index<W: std::io::Write>(
+ reexports: &[(&str, &str)],
+ w: &mut W,
+) -> std::io::Result<()> {
+ if reexports.is_empty() {
+ // Match the legacy template exactly — an empty reexport list
+ // produces a single trailing newline (joining `[]` with `"\n"`
+ // yields `""`, then the template appends `"\n"`).
+ return w.write_all(b"\n");
+ }
+ for (name, specifier) in reexports {
+ w.write_all(b"export { ")?;
+ w.write_all(name.as_bytes())?;
+ w.write_all(b" } from \"")?;
+ w.write_all(specifier.as_bytes())?;
+ w.write_all(b"\";\n")?;
+ }
+ Ok(())
+}
+
+fn emit_combined_imports(buf: &mut CodeBuffer, component_imports: &[(Symbol, Symbol)]) {
+ // Same dedup-by-module logic as `emit_page`'s `emit_combined_imports`,
+ // but seeded with the memo-specific runtime header (`memo` instead of
+ // `Fragment`). We split runtime imports into `react` (top) + rest
+ // (bottom) so the layout matches the legacy `memo_single_component_template`
+ // output.
+ let mut combined: Vec<(Symbol, Symbol)> =
+ Vec::with_capacity(MEMO_RUNTIME_IMPORTS.len() + component_imports.len());
+
+ let runtime_react: Vec<(Symbol, Symbol)> = MEMO_RUNTIME_IMPORTS
+ .iter()
+ .filter(|(m, _)| *m == "react")
+ .map(|(m, a)| (intern(m), intern(a)))
+ .collect();
+ let runtime_rest: Vec<(Symbol, Symbol)> = MEMO_RUNTIME_IMPORTS
+ .iter()
+ .filter(|(m, _)| *m != "react")
+ .map(|(m, a)| (intern(m), intern(a)))
+ .collect();
+
+ combined.extend(runtime_react);
+ combined.extend_from_slice(component_imports);
+ combined.extend(runtime_rest);
+
+ emit_imports_grouped_by_module(buf, &combined);
+}
+
+fn emit_imports_grouped_by_module(buf: &mut CodeBuffer, imports: &[(Symbol, Symbol)]) {
+ let mut modules: Vec<Symbol> = Vec::new();
+ for (m, _) in imports {
+ if !modules.contains(m) {
+ modules.push(*m);
+ }
+ }
+ for module in modules {
+ let mut emitted: Vec<Symbol> = Vec::new();
+ buf.write_str("import { ");
+ let mut first = true;
+ for (m, alias) in imports {
+ if *m != module {
+ continue;
+ }
+ if emitted.contains(alias) {
+ continue;
+ }
+ if !first {
+ buf.write_str(", ");
+ }
+ first = false;
+ buf.write_str(resolve_unchecked(*alias));
+ emitted.push(*alias);
+ }
+ buf.write_str(" } from \"");
+ buf.write_str(resolve_unchecked(module));
+ buf.write_str("\";\n");
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::emit_memo_index;
+
+ fn render(reexports: &[(&str, &str)]) -> String {
+ let mut buf = Vec::new();
+ emit_memo_index(reexports, &mut buf).unwrap();
+ String::from_utf8(buf).unwrap()
+ }
+
+ #[test]
+ fn emits_one_reexport_per_entry() {
+ let reexports = [
+ ("Foo", "components/Foo"),
+ ("BarBaz", "components/BarBaz"),
+ ];
+ assert_eq!(
+ render(&reexports),
+ "export { Foo } from \"components/Foo\";\nexport { BarBaz } from \"components/BarBaz\";\n"
+ );
+ }
+
+ #[test]
+ fn empty_reexports_match_legacy_template() {
+ // Legacy `memo_index_template([])` returns `"\n"` because
+ // `"\n".join([]) + "\n" == "\n"`. The Rust port matches.
+ assert_eq!(render(&[]), "\n");
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/page.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/page.rs
new file mode 100644
index 00000000000..a330c2af52e
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/page.rs
@@ -0,0 +1,480 @@
+//! Page-level emission: render a `Page` as a JS source string ready for the
+//! Vite frontend to consume. See plan §4.1, §4.8.
+//!
+//! Output shape — the contract the running React frontend expects:
+//!
+//! ```js
+//! import { Fragment, useContext, useRef } from "react";
+//! import { Box as RadixThemesBox } from "@radix-ui/themes"; // from page.component_imports
+//! import { EventLoopContext, StateContexts } from "$/utils/context";
+//! import { refs, ReflexEvent } from "$/utils/state";
+//! import { jsx } from "@emotion/react";
+//!
+//! export default function Component() {
+//! const ref_root = useRef(null); refs["ref_root"] = ref_root; // when page.needs_ref
+//! const <state_path> = useContext(StateContexts.<state_path>); // per state_bindings entry
+//! const [addEvents, connectErrors] = useContext(EventLoopContext);
+//! return ( jsx(...) );
+//! }
+//!
+//! export const __reflex_route = "<route>";
+//! export const __reflex_title = "<title>";
+//! ```
+//!
+//! `route_ident` is only used for the `__reflex_route_ident` constant —
+//! the React runtime always imports the page via the default export named
+//! `Component`. Caller can override with [`emit_page_named`].
+
+use reflex_intern::{intern, resolve_unchecked, Symbol};
+use reflex_ir::Page;
+
+use crate::buffer::CodeBuffer;
+use crate::jsx::emit_component_with_map;
+use crate::sourcemap::SourceMap;
+
+/// Default JS function name the React runtime imports from each page module.
+pub const DEFAULT_ROUTE_FN: &str = "Component";
+
+/// Emit a full page module (no source-map recording, default `Component` name).
+#[inline]
+pub fn emit_page(buf: &mut CodeBuffer, page: &Page<'_>, route_ident: &str) {
+ emit_page_inner(buf, page, route_ident, DEFAULT_ROUTE_FN, None, &[], "")
+}
+
+/// Emit a full page module with a custom JS function name.
+#[inline]
+pub fn emit_page_named(
+ buf: &mut CodeBuffer,
+ page: &Page<'_>,
+ route_ident: &str,
+ fn_name: &str,
+) {
+ emit_page_inner(buf, page, route_ident, fn_name, None, &[], "")
+}
+
+/// Emit a full page module and record an optional `SourceMap`.
+pub fn emit_page_with_map(
+ buf: &mut CodeBuffer,
+ page: &Page<'_>,
+ route_ident: &str,
+ map: &mut SourceMap,
+) {
+ emit_page_inner(buf, page, route_ident, DEFAULT_ROUTE_FN, Some(map), &[], "")
+}
+
+/// Emit a full page module with caller-provided `custom_code` blocks
+/// (Component `_get_all_custom_code()` strings spliced between imports
+/// and the `export default function` line) and a `hooks_body` (pre-
+/// rendered hooks block inserted inside the component function before
+/// the `useContext(EventLoopContext)` line).
+///
+/// Mirrors the legacy `page_template` which renders custom code +
+/// hooks alongside the JSX. Used by `compile_page_from_component` so
+/// pages emitted via pyread include the markdown `ComponentMap_*`
+/// closures (and similar helpers) the legacy template produced.
+pub fn emit_page_with_extras(
+ buf: &mut CodeBuffer,
+ page: &Page<'_>,
+ route_ident: &str,
+ custom_code: &[&str],
+ hooks_body: &str,
+) {
+ emit_page_inner(
+ buf,
+ page,
+ route_ident,
+ DEFAULT_ROUTE_FN,
+ None,
+ custom_code,
+ hooks_body,
+ )
+}
+
+fn emit_page_inner(
+ buf: &mut CodeBuffer,
+ page: &Page<'_>,
+ route_ident: &str,
+ fn_name: &str,
+ map: Option<&mut SourceMap>,
+ custom_code: &[&str],
+ hooks_body: &str,
+) {
+ // ---- Imports ------------------------------------------------------
+ //
+ // React + Reflex runtime imports are always present. Component-class
+ // imports come from page.component_imports (harvested by the bridge).
+ //
+ // We merge baseline runtime imports with component_imports through a
+ // single grouped emitter so that aliases bringing in extras from the
+ // same module (e.g. `ColorModeContext` alongside `EventLoopContext`)
+ // collapse onto one import line instead of producing duplicates.
+
+ emit_combined_imports(buf, page.component_imports);
+
+ // ---- Custom code blocks ------------------------------------------
+ // Component `_get_all_custom_code()` strings (markdown component
+ // maps, JIT helpers, etc.) get spliced between imports and the
+ // `export default function` line — matching the legacy `page_template`.
+ for block in custom_code {
+ buf.write_byte(b'\n');
+ buf.write_str(block);
+ if !block.ends_with('\n') {
+ buf.write_byte(b'\n');
+ }
+ }
+
+ // ---- Render function ---------------------------------------------
+ buf.write_str("\nexport default function ");
+ buf.write_str(fn_name);
+ buf.write_str("() {\n");
+
+ if page.needs_ref {
+ // Single shared ref for now; once the bridge tracks per-`id` refs
+ // we'll emit one line per id. The legacy renderer uses
+ // `ref_<id_or_synthetic>`.
+ buf.write_str(
+ " const ref_root = useRef(null); refs[\"ref_root\"] = ref_root;\n",
+ );
+ }
+ for binding in page.state_bindings {
+ let s = resolve_unchecked(*binding);
+ buf.write_str(" const ");
+ buf.write_str(s);
+ buf.write_str(" = useContext(StateContexts.");
+ buf.write_str(s);
+ buf.write_str(");\n");
+ }
+ buf.write_str(
+ " const [addEvents, connectErrors] = useContext(EventLoopContext);\n",
+ );
+
+ // ---- Hooks block --------------------------------------------------
+ // Pre-rendered hook body from the caller — declarations the
+ // legacy `_render_hooks` would have produced. We splice the
+ // string verbatim; if it's non-empty and doesn't end with a
+ // newline, add one to keep the trailing `return` separate.
+ if !hooks_body.is_empty() {
+ buf.write_str(hooks_body);
+ if !hooks_body.ends_with('\n') {
+ buf.write_byte(b'\n');
+ }
+ }
+
+ // If the page declares a title or any meta tags, wrap the root in a
+ // Fragment alongside the synthetic <title> / <meta> JSX children so the
+ // browser tab + social-card metadata work the same way the legacy
+ // compiler emits them.
+ let wrap_in_fragment = page.title.is_some() || !page.meta.is_empty();
+
+ buf.write_str(" return ");
+ if wrap_in_fragment {
+ buf.write_str("jsx(Fragment, {}, ");
+ emit_component_with_map(buf, page.root, map);
+ if let Some(title) = page.title {
+ buf.write_str(", jsx(\"title\", {}, ");
+ buf.write_js_string(title);
+ buf.write_str(")");
+ }
+ for meta in page.meta {
+ buf.write_str(", jsx(\"meta\", {");
+ let name = resolve_unchecked(meta.name);
+ // Treat well-known social/OG keys as `property=…`; everything
+ // else uses `name=…`. Matches the legacy emitter's convention.
+ let key = if name.starts_with("og:") || name.starts_with("twitter:") {
+ "property"
+ } else {
+ "name"
+ };
+ buf.write_str(key);
+ buf.write_str(": ");
+ buf.write_js_string(name);
+ buf.write_str(", content: ");
+ buf.write_js_string(meta.content);
+ buf.write_str("})");
+ }
+ buf.write_str(")");
+ } else {
+ emit_component_with_map(buf, page.root, map);
+ }
+ buf.write_str(";\n}\n");
+
+ // ---- Page metadata exports ---------------------------------------
+ buf.write_str("\nexport const __reflex_route = ");
+ buf.write_js_string(page.route);
+ buf.write_str(";\n");
+
+ buf.write_str("export const __reflex_route_ident = ");
+ buf.write_js_string(route_ident);
+ buf.write_str(";\n");
+
+ if let Some(title) = page.title {
+ buf.write_str("export const __reflex_title = ");
+ buf.write_js_string(title);
+ buf.write_str(";\n");
+ }
+}
+
+/// Baseline runtime aliases that every page module needs, paired with the
+/// module they come from. Emitted alongside `component_imports` so a single
+/// grouped pass dedupes overlapping symbols (e.g. `EventLoopContext`).
+const RUNTIME_IMPORTS: &[(&str, &str)] = &[
+ ("react", "Fragment"),
+ ("react", "useContext"),
+ ("react", "useRef"),
+ ("$/utils/context", "EventLoopContext"),
+ ("$/utils/context", "StateContexts"),
+ ("$/utils/state", "refs"),
+ ("$/utils/state", "ReflexEvent"),
+ ("@emotion/react", "jsx"),
+];
+
+/// Emit imports for a page module by combining baseline runtime imports with
+/// the component-harvested `component_imports` from the IR, in that order.
+///
+/// `react` is anchored at the top and `@emotion/react` at the bottom to match
+/// the layout the legacy emitter produced; modules harvested from
+/// `component_imports` slot in between in first-seen order. Aliases that
+/// appear in both sources collapse via the per-module dedup inside
+/// `emit_imports_grouped_by_module`.
+fn emit_combined_imports(buf: &mut CodeBuffer, component_imports: &[(Symbol, Symbol)]) {
+ let mut combined: Vec<(Symbol, Symbol)> =
+ Vec::with_capacity(RUNTIME_IMPORTS.len() + component_imports.len());
+
+ let runtime_react: Vec<(Symbol, Symbol)> = RUNTIME_IMPORTS
+ .iter()
+ .filter(|(m, _)| *m == "react")
+ .map(|(m, a)| (intern(m), intern(a)))
+ .collect();
+ let runtime_rest: Vec<(Symbol, Symbol)> = RUNTIME_IMPORTS
+ .iter()
+ .filter(|(m, _)| *m != "react")
+ .map(|(m, a)| (intern(m), intern(a)))
+ .collect();
+
+ combined.extend(runtime_react);
+ combined.extend_from_slice(component_imports);
+ combined.extend(runtime_rest);
+
+ emit_imports_grouped_by_module(buf, &combined);
+}
+
+fn emit_imports_grouped_by_module(
+ buf: &mut CodeBuffer,
+ imports: &[(Symbol, Symbol)],
+) {
+ // Imports are `(module, alias_spec)` pairs where alias_spec is the
+ // string spliced inside `import { … }` — either a bare identifier
+ // (`"useState"`) or a renamed one (`"Box as RadixThemesBox"`). We
+ // group by module preserving first-seen order, and within each module
+ // dedup the alias_spec list so the bridge can pass redundant entries
+ // without producing `{ useState, useState }`.
+ let mut modules: Vec<Symbol> = Vec::new();
+ for (m, _) in imports {
+ if !modules.contains(m) {
+ modules.push(*m);
+ }
+ }
+ for module in modules {
+ let mut emitted: Vec<Symbol> = Vec::new();
+ buf.write_str("import { ");
+ let mut first = true;
+ for (m, alias) in imports {
+ if *m != module {
+ continue;
+ }
+ if emitted.contains(alias) {
+ continue;
+ }
+ emitted.push(*alias);
+ if !first {
+ buf.write_str(", ");
+ }
+ first = false;
+ buf.write_str(resolve_unchecked(*alias));
+ }
+ buf.write_str(" } from ");
+ buf.write_js_string(resolve_unchecked(module));
+ buf.write_str(";\n");
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_arena::Arena;
+ use reflex_ir::parse::test_helpers::tiny_page_bytes;
+ use reflex_ir::parse_page;
+
+ #[test]
+ fn emits_page_module() {
+ let arena = Arena::new();
+ let bytes = tiny_page_bytes();
+ let page = parse_page(&arena, &bytes).unwrap();
+ let mut buf = CodeBuffer::new();
+ emit_page(&mut buf, &page, "Index");
+ let s = buf.as_str();
+ assert!(s.contains("import { Fragment, useContext, useRef } from \"react\""));
+ assert!(s.contains(
+ "import { EventLoopContext, StateContexts } from \"$/utils/context\""
+ ));
+ assert!(s.contains("export default function Component()"));
+ assert!(s.contains("const [addEvents, connectErrors] = useContext(EventLoopContext);"));
+ assert!(s.contains("jsx(div, {id: x}, \"hello\")"));
+ assert!(s.contains("export const __reflex_route = \"/index\""));
+ assert!(s.contains("export const __reflex_route_ident = \"Index\""));
+ }
+
+ #[test]
+ fn page_with_component_imports() {
+ use reflex_ir::{Component, NodeId, Page as PageIR, SourceLoc};
+ let arena = Arena::new();
+ let text = arena.alloc(Component::Text {
+ value: "x",
+ id: NodeId(1),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ let imports = [(
+ reflex_intern::intern("@radix-ui/themes"),
+ reflex_intern::intern("Box as RadixThemesBox"),
+ )];
+ let bindings = [reflex_intern::intern(
+ "reflex___state____state__demo____my_state",
+ )];
+ let page = PageIR {
+ schema_version: 2,
+ route: "/x",
+ root: &*text,
+ title: None,
+ meta: &[],
+ source_files: &[],
+ component_imports: arena.bump().alloc_slice_copy(&imports),
+ state_bindings: arena.bump().alloc_slice_copy(&bindings),
+ needs_ref: true,
+ };
+ let mut buf = CodeBuffer::new();
+ emit_page(&mut buf, &page, "X");
+ let s = buf.as_str();
+ assert!(
+ s.contains("import { Box as RadixThemesBox } from \"@radix-ui/themes\""),
+ "got:\n{s}"
+ );
+ assert!(s.contains(
+ "const reflex___state____state__demo____my_state = useContext(StateContexts.reflex___state____state__demo____my_state);"
+ ));
+ assert!(s.contains("const ref_root = useRef(null); refs[\"ref_root\"] = ref_root;"));
+ }
+
+ #[test]
+ fn runtime_imports_merge_with_component_imports() {
+ // Regression: when VarData walks bring `$/utils/context` /
+ // `$/utils/state` symbols into `component_imports`, the page emitter
+ // must merge them with the baseline runtime imports rather than
+ // emitting a second `import { ... } from "$/utils/context"` line that
+ // re-declares `EventLoopContext` / `StateContexts`.
+ use reflex_ir::{Component, NodeId, Page as PageIR, SourceLoc};
+ let arena = Arena::new();
+ let text = arena.alloc(Component::Text {
+ value: "x",
+ id: NodeId(1),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ let imports = [
+ (
+ reflex_intern::intern("$/utils/context"),
+ reflex_intern::intern("EventLoopContext"),
+ ),
+ (
+ reflex_intern::intern("$/utils/context"),
+ reflex_intern::intern("StateContexts"),
+ ),
+ (
+ reflex_intern::intern("$/utils/context"),
+ reflex_intern::intern("ColorModeContext"),
+ ),
+ (
+ reflex_intern::intern("$/utils/state"),
+ reflex_intern::intern("ReflexEvent"),
+ ),
+ (
+ reflex_intern::intern("$/utils/state"),
+ reflex_intern::intern("applyEventActions"),
+ ),
+ ];
+ let page = PageIR {
+ schema_version: 2,
+ route: "/x",
+ root: &*text,
+ title: None,
+ meta: &[],
+ source_files: &[],
+ component_imports: arena.bump().alloc_slice_copy(&imports),
+ state_bindings: &[],
+ needs_ref: false,
+ };
+ let mut buf = CodeBuffer::new();
+ emit_page(&mut buf, &page, "X");
+ let s = buf.as_str();
+
+ // Each runtime module appears exactly once.
+ assert_eq!(
+ s.matches("from \"$/utils/context\"").count(),
+ 1,
+ "$/utils/context emitted more than once:\n{s}"
+ );
+ assert_eq!(
+ s.matches("from \"$/utils/state\"").count(),
+ 1,
+ "$/utils/state emitted more than once:\n{s}"
+ );
+
+ // The merged $/utils/context line carries baseline + the extra
+ // ColorModeContext brought in by component_imports.
+ assert!(
+ s.contains(
+ "import { EventLoopContext, StateContexts, ColorModeContext } from \"$/utils/context\";"
+ ),
+ "merged context import missing:\n{s}"
+ );
+ // The merged $/utils/state line carries baseline + applyEventActions
+ // (first-seen order: component_imports come before the trailing
+ // baseline aliases, so `refs` slots in after `applyEventActions`).
+ assert!(
+ s.contains(
+ "import { ReflexEvent, applyEventActions, refs } from \"$/utils/state\";"
+ ),
+ "merged state import missing:\n{s}"
+ );
+ }
+
+ #[test]
+ fn source_map_records_non_synthetic_locs() {
+ use reflex_ir::{Component, NodeId, Page as PageIR, PyFileId, SourceLoc};
+ let arena = Arena::new();
+ let real_loc = SourceLoc { file: PyFileId(7), line: 42, col: 11 };
+ let text = arena.alloc(Component::Text {
+ value: arena.alloc_str("hi"),
+ id: NodeId(1),
+ source_loc: real_loc,
+ });
+ let page = PageIR {
+ schema_version: 2,
+ route: "/r",
+ root: &*text,
+ title: None,
+ meta: &[],
+ source_files: &[],
+ component_imports: &[],
+ state_bindings: &[],
+ needs_ref: false,
+ };
+ let mut buf = CodeBuffer::new();
+ let mut map = crate::SourceMap::new();
+ emit_page_with_map(&mut buf, &page, "R", &mut map);
+ let s = buf.as_str();
+ let pos = s.find("\"hi\"").expect(r#"the "hi" literal should be in the output"#);
+ let mapped = map.lookup(pos as u32).expect("location recorded");
+ assert_eq!(mapped.file.0, 7);
+ assert_eq!(mapped.line, 42);
+ assert_eq!(map.len(), 1);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/sourcemap.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/sourcemap.rs
new file mode 100644
index 00000000000..8d371a67400
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/sourcemap.rs
@@ -0,0 +1,122 @@
+//! Source-map recording during JSX emission. See plan §4.6.
+//!
+//! Every IR node carries a `SourceLoc` (`PyFileId`, line, col). When the
+//! codegen emits that node's tokens it records the current `CodeBuffer`
+//! byte offset alongside the `SourceLoc`. The resulting `SourceMap` lets a
+//! diagnostic at byte N of the emitted module back-map to the Python source
+//! that produced it.
+//!
+//! The format is intentionally simple — a sorted `Vec<(u32 offset, SourceLoc)>`.
+//! Lookup is binary search. We don't emit JS-side source maps (`source-map`
+//! v3) here because the consumer of these mappings is Reflex's own error
+//! reporter, not the browser. If browser source maps are needed later, this
+//! is the layer that converts.
+
+use reflex_ir::SourceLoc;
+
+#[derive(Debug, Clone, Default)]
+pub struct SourceMap {
+ entries: Vec<(u32, SourceLoc)>,
+}
+
+impl SourceMap {
+ pub fn new() -> Self {
+ Self::default()
+ }
+
+ /// Record `offset → loc`. `offset` should be the byte position in the
+ /// surrounding `CodeBuffer` just before the token whose origin is `loc`.
+ #[inline]
+ pub fn record(&mut self, offset: u32, loc: SourceLoc) {
+ // Skip synthetic locations — they don't help diagnostics and would
+ // bloat the map.
+ if loc.file.0 == 0 && loc.line == 0 && loc.col == 0 {
+ return;
+ }
+ // Merge consecutive identical locations — they tend to cluster at
+ // every prop/child of the same Element.
+ if let Some((_, last)) = self.entries.last() {
+ if *last == loc {
+ return;
+ }
+ }
+ self.entries.push((offset, loc));
+ }
+
+ /// Find the SourceLoc that covers `offset`. Returns `None` if `offset`
+ /// precedes all recorded entries.
+ pub fn lookup(&self, offset: u32) -> Option<SourceLoc> {
+ if self.entries.is_empty() {
+ return None;
+ }
+ match self.entries.binary_search_by_key(&offset, |(o, _)| *o) {
+ Ok(idx) => Some(self.entries[idx].1),
+ Err(0) => None,
+ Err(idx) => Some(self.entries[idx - 1].1),
+ }
+ }
+
+ pub fn len(&self) -> usize {
+ self.entries.len()
+ }
+
+ pub fn is_empty(&self) -> bool {
+ self.entries.is_empty()
+ }
+
+ pub fn entries(&self) -> &[(u32, SourceLoc)] {
+ &self.entries
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_ir::PyFileId;
+
+ fn loc(file: u32, line: u32) -> SourceLoc {
+ SourceLoc {
+ file: PyFileId(file),
+ line,
+ col: 1,
+ }
+ }
+
+ #[test]
+ fn skip_synthetic() {
+ let mut m = SourceMap::new();
+ m.record(10, SourceLoc::SYNTHETIC);
+ assert!(m.is_empty());
+ }
+
+ #[test]
+ fn merges_consecutive_duplicates() {
+ let mut m = SourceMap::new();
+ m.record(0, loc(1, 5));
+ m.record(10, loc(1, 5));
+ m.record(20, loc(1, 5));
+ assert_eq!(m.len(), 1);
+ }
+
+ #[test]
+ fn lookup_picks_floor() {
+ let mut m = SourceMap::new();
+ m.record(0, loc(1, 5));
+ m.record(100, loc(1, 10));
+ m.record(200, loc(2, 1));
+ assert_eq!(m.lookup(0).unwrap().line, 5);
+ assert_eq!(m.lookup(50).unwrap().line, 5);
+ assert_eq!(m.lookup(100).unwrap().line, 10);
+ assert_eq!(m.lookup(150).unwrap().line, 10);
+ assert_eq!(m.lookup(200).unwrap().line, 1);
+ assert_eq!(m.lookup(1000).unwrap().line, 1);
+ }
+
+ #[test]
+ fn lookup_below_first_returns_none() {
+ let mut m = SourceMap::new();
+ m.record(100, loc(1, 5));
+ assert!(m.lookup(0).is_none());
+ assert!(m.lookup(99).is_none());
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/static_artifacts.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/static_artifacts.rs
new file mode 100644
index 00000000000..4470470e3ab
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/static_artifacts.rs
@@ -0,0 +1,161 @@
+//! Mechanical ports of the small static-artifact templates that
+//! ``rust_pipeline.py`` needs to write into ``.web/``.
+//!
+//! Each function streams output through a generic ``Write`` so the
+//! PyO3 binding can hand it a ``BufWriter<File>`` and skip any
+//! intermediate ``String`` allocation. Unit tests pass ``&mut Vec<u8>``
+//! and compare against the legacy Python templates in
+//! ``packages/reflex-base/src/reflex_base/compiler/templates.py``.
+
+use std::io::{self, Write};
+
+/// Emit ``.web/styles/styles.css``.
+///
+/// Ports ``styles_template`` —
+/// ``"@layer __reflex_base;\n" + "\n".join(f"@import url('{s}');", ...)``.
+///
+/// Args:
+/// stylesheets: stylesheet URLs/paths spliced into ``@import`` lines.
+/// w: byte sink.
+pub fn emit_styles_root<W: Write>(stylesheets: &[&str], w: &mut W) -> io::Result<()> {
+ w.write_all(b"@layer __reflex_base;\n")?;
+ for (i, sheet) in stylesheets.iter().enumerate() {
+ if i > 0 {
+ w.write_all(b"\n")?;
+ }
+ w.write_all(b"@import url('")?;
+ w.write_all(sheet.as_bytes())?;
+ w.write_all(b"');")?;
+ }
+ Ok(())
+}
+
+/// Emit ``.web/utils/theme.js``.
+///
+/// Ports ``theme_template`` — ``f"export default {theme}"``. ``theme``
+/// is already a JS object literal (the legacy compiler runs
+/// ``LiteralVar.create(theme)`` before passing it in).
+///
+/// Args:
+/// theme_js: the JS expression that becomes the default export.
+/// w: byte sink.
+pub fn emit_theme_module<W: Write>(theme_js: &str, w: &mut W) -> io::Result<()> {
+ w.write_all(b"export default ")?;
+ w.write_all(theme_js.as_bytes())
+}
+
+/// Write ``.web/backend/stateful_pages.json``.
+///
+/// Mirrors ``App._write_stateful_pages_marker`` — emits a JSON array of
+/// route strings the backend treats as stateful. The Python side
+/// computes the route list (it requires a state walk we haven't ported
+/// yet); Rust just serializes and writes.
+///
+/// Args:
+/// routes: stateful route strings.
+/// w: byte sink.
+pub fn emit_stateful_pages_json<W: Write>(routes: &[&str], w: &mut W) -> io::Result<()> {
+ w.write_all(b"[")?;
+ for (i, route) in routes.iter().enumerate() {
+ if i > 0 {
+ w.write_all(b", ")?;
+ }
+ write_json_string(w, route)?;
+ }
+ w.write_all(b"]")
+}
+
+/// Write a JSON-escaped string literal (with surrounding quotes).
+///
+/// Matches Python's ``json.dumps`` for ASCII inputs: backslash, quote,
+/// and control bytes are escaped; everything else is passed through
+/// verbatim. Route strings are URL paths so this is sufficient — full
+/// Unicode JSON escaping isn't needed here.
+fn write_json_string<W: Write>(w: &mut W, s: &str) -> io::Result<()> {
+ w.write_all(b"\"")?;
+ let bytes = s.as_bytes();
+ let mut start = 0;
+ for (i, &b) in bytes.iter().enumerate() {
+ let escaped: &[u8] = match b {
+ b'"' => b"\\\"",
+ b'\\' => b"\\\\",
+ b'\n' => b"\\n",
+ b'\r' => b"\\r",
+ b'\t' => b"\\t",
+ 0x08 => b"\\b",
+ 0x0c => b"\\f",
+ 0x00..=0x1f => {
+ // Rare control byte; fall back to the \uXXXX form.
+ w.write_all(&bytes[start..i])?;
+ write!(w, "\\u{:04x}", b)?;
+ start = i + 1;
+ continue;
+ }
+ _ => continue,
+ };
+ w.write_all(&bytes[start..i])?;
+ w.write_all(escaped)?;
+ start = i + 1;
+ }
+ w.write_all(&bytes[start..])?;
+ w.write_all(b"\"")
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ fn render<F>(f: F) -> String
+ where
+ F: FnOnce(&mut Vec<u8>) -> io::Result<()>,
+ {
+ let mut buf = Vec::new();
+ f(&mut buf).unwrap();
+ String::from_utf8(buf).unwrap()
+ }
+
+ #[test]
+ fn styles_root_matches_legacy_template() {
+ // `styles_template(["a.css", "b.css"])` =
+ // "@layer __reflex_base;\n@import url('a.css');\n@import url('b.css');"
+ let out = render(|w| emit_styles_root(&["a.css", "b.css"], w));
+ assert_eq!(
+ out,
+ "@layer __reflex_base;\n@import url('a.css');\n@import url('b.css');"
+ );
+ }
+
+ #[test]
+ fn styles_root_empty_list_keeps_layer_header() {
+ // `styles_template([])` = "@layer __reflex_base;\n" + "" = "@layer __reflex_base;\n"
+ let out = render(|w| emit_styles_root(&[], w));
+ assert_eq!(out, "@layer __reflex_base;\n");
+ }
+
+ #[test]
+ fn theme_module_matches_legacy_template() {
+ // `theme_template("{accentColor: 'tomato'}")` =
+ // "export default {accentColor: 'tomato'}"
+ let out = render(|w| emit_theme_module("{accentColor: 'tomato'}", w));
+ assert_eq!(out, "export default {accentColor: 'tomato'}");
+ }
+
+ #[test]
+ fn stateful_pages_empty_list() {
+ let out = render(|w| emit_stateful_pages_json(&[], w));
+ assert_eq!(out, "[]");
+ }
+
+ #[test]
+ fn stateful_pages_with_routes() {
+ let out =
+ render(|w| emit_stateful_pages_json(&["index", "about", "blog/post-1"], w));
+ assert_eq!(out, r#"["index", "about", "blog/post-1"]"#);
+ }
+
+ #[test]
+ fn stateful_pages_escapes_special_chars() {
+ let out = render(|w| emit_stateful_pages_json(&["a/\"b\""], w));
+ assert_eq!(out, r#"["a/\"b\""]"#);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/theme.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/theme.rs
new file mode 100644
index 00000000000..5448c14dad0
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/theme.rs
@@ -0,0 +1,117 @@
+//! Theme CSS emission. See plan §4.2, D10.
+//!
+//! The Python theme (`ThemeIR`) ships a `(token_name, token_value)` table
+//! plus a raw `global_style` CSS chunk and an `appearance` setting. We emit
+//! a `:root { --token: value; ... }` block followed by the global CSS,
+//! returning one self-contained stylesheet string.
+//!
+//! Token names are emitted as CSS custom properties: `tokenName` →
+//! `--token-name`. Reflex's convention matches Emotion's output.
+
+use reflex_intern::resolve_unchecked;
+use reflex_ir::Theme;
+
+use crate::buffer::CodeBuffer;
+
+pub fn emit_theme(buf: &mut CodeBuffer, theme: &Theme<'_>) {
+ if !theme.tokens.is_empty() {
+ buf.write_str(":root {\n");
+ for (name, value) in theme.tokens {
+ buf.write_str(" --");
+ write_kebab(buf, resolve_unchecked(*name));
+ buf.write_str(": ");
+ buf.write_str(value);
+ buf.write_str(";\n");
+ }
+ buf.write_str("}\n\n");
+ }
+
+ if !theme.global_style.is_empty() {
+ buf.write_str(theme.global_style);
+ if !theme.global_style.ends_with('\n') {
+ buf.write_byte(b'\n');
+ }
+ }
+}
+
+/// camelCase / snake_case → kebab-case for CSS custom property names.
+fn write_kebab(buf: &mut CodeBuffer, name: &str) {
+ let mut first = true;
+ for &b in name.as_bytes() {
+ match b {
+ b'_' => {
+ buf.write_byte(b'-');
+ first = false;
+ }
+ b'A'..=b'Z' => {
+ if !first {
+ buf.write_byte(b'-');
+ }
+ buf.write_byte(b.to_ascii_lowercase());
+ first = false;
+ }
+ _ => {
+ buf.write_byte(b);
+ first = false;
+ }
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_arena::Arena;
+ use reflex_intern::intern;
+ use reflex_ir::Theme;
+
+ #[test]
+ fn emits_tokens_and_global_css() {
+ let arena = Arena::new();
+ let tokens: Vec<(reflex_intern::Symbol, &str)> = vec![
+ (intern("accentColor"), "#ff0080"),
+ (intern("radiusMd"), "8px"),
+ ];
+ let theme = Theme {
+ schema_version: 1,
+ tokens: arena.bump().alloc_slice_copy(&tokens),
+ global_style: "body { margin: 0; }",
+ appearance: "light",
+ };
+ let mut buf = CodeBuffer::new();
+ emit_theme(&mut buf, &theme);
+ let s = buf.as_str();
+ assert!(s.contains(":root {"));
+ assert!(s.contains("--accent-color: #ff0080;"));
+ assert!(s.contains("--radius-md: 8px;"));
+ assert!(s.contains("body { margin: 0; }"));
+ }
+
+ #[test]
+ fn empty_tokens_omit_root_block() {
+ let theme = Theme {
+ schema_version: 1,
+ tokens: &[],
+ global_style: "body { color: red; }",
+ appearance: "light",
+ };
+ let mut buf = CodeBuffer::new();
+ emit_theme(&mut buf, &theme);
+ let s = buf.as_str();
+ assert!(!s.contains(":root"));
+ assert!(s.contains("body { color: red; }"));
+ }
+
+ #[test]
+ fn empty_theme_emits_nothing() {
+ let theme = Theme {
+ schema_version: 1,
+ tokens: &[],
+ global_style: "",
+ appearance: "light",
+ };
+ let mut buf = CodeBuffer::new();
+ emit_theme(&mut buf, &theme);
+ assert!(buf.is_empty());
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_codegen/src/vite.rs b/packages/reflex-compiler-rust/crates/reflex_codegen/src/vite.rs
new file mode 100644
index 00000000000..4cccc04e0b0
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_codegen/src/vite.rs
@@ -0,0 +1,57 @@
+//! Vite config emission. See plan §4.5 (artifact #8), D10.
+//!
+//! The config is a JS module that exports the default Vite config object.
+//! For v1 we emit a minimal config — Reflex's existing Vite config has more
+//! options but they're conditionally toggled and depend on Reflex's
+//! configuration system, which lives in Python. We expose hooks so the
+//! Python side can splice in plugin-specific blocks.
+
+use crate::buffer::CodeBuffer;
+
+/// Emit a minimal `vite.config.js` to `buf`.
+///
+/// `extra_plugins_js` is a free-form JS array body (e.g.
+/// `"reflexPlugin(), tsconfigPaths()"`) that the Python side composes from
+/// the plugin manifest. The emitter splices it verbatim — it's the Python
+/// side's responsibility to ensure the snippet is valid JS.
+pub fn emit_vite_config(buf: &mut CodeBuffer, extra_plugins_js: &str) {
+ buf.write_str("import { defineConfig } from \"vite\";\n");
+ buf.write_str("import react from \"@vitejs/plugin-react\";\n\n");
+
+ buf.write_str("export default defineConfig({\n");
+ buf.write_str(" plugins: [react()");
+ if !extra_plugins_js.is_empty() {
+ buf.write_str(", ");
+ buf.write_str(extra_plugins_js);
+ }
+ buf.write_str("],\n");
+ buf.write_str(" build: { outDir: \"dist\", emptyOutDir: true },\n");
+ buf.write_str(" resolve: {\n");
+ buf.write_str(" alias: {\n");
+ buf.write_str(" \"$\": \"/src\",\n");
+ buf.write_str(" },\n");
+ buf.write_str(" },\n");
+ buf.write_str("});\n");
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn minimal_config() {
+ let mut buf = CodeBuffer::new();
+ emit_vite_config(&mut buf, "");
+ let s = buf.as_str();
+ assert!(s.contains("defineConfig"));
+ assert!(s.contains("plugins: [react()],"));
+ }
+
+ #[test]
+ fn config_with_extra_plugins() {
+ let mut buf = CodeBuffer::new();
+ emit_vite_config(&mut buf, "reflexPlugin()");
+ let s = buf.as_str();
+ assert!(s.contains("plugins: [react(), reflexPlugin()],"));
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_db/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_db/Cargo.toml
new file mode 100644
index 00000000000..fdc5cb0d867
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_db/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "reflex_db"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+reflex_ir = { workspace = true }
+reflex_codegen = { workspace = true }
+reflex_arena = { workspace = true }
+reflex_intern = { workspace = true }
+rayon = { workspace = true }
+thiserror = { workspace = true }
+xxhash-rust = { version = "0.8", features = ["xxh3"] }
diff --git a/packages/reflex-compiler-rust/crates/reflex_db/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_db/src/lib.rs
new file mode 100644
index 00000000000..37604156886
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_db/src/lib.rs
@@ -0,0 +1,198 @@
+//! Compiler caching layer. See plan §3.3 / R4 / D5.
+//!
+//! **Implementation note (2026-05-16).** The plan calls for a full Salsa
+//! database with `#[salsa::input] PageIr` per route and `#[salsa::tracked]
+//! emit_page` queries. The actual user-visible behavior at v0.1 is "if the
+//! page's content hash hasn't changed, skip recompilation" — which is what
+//! Salsa's revision-based invalidation reduces to for a single-tracked-query
+//! pipeline. We ship that simpler model first: an `xxh3_64`-keyed
+//! `HashMap<(route_ident, ContentHash), Arc<str>>` cache wrapped around the
+//! parse-and-emit pipeline. The public API (`CompilerDb::emit_page`) is the
+//! surface Salsa will replace; once D7 needs cross-query sharing
+//! (aggregator walks reusing the parsed tree), the inner storage swaps to
+//! real `#[salsa::tracked]` queries without touching callers.
+//!
+//! **Pitfall 14 — collisions.** Debug builds re-hash on cache hit and panic
+//! on mismatch. Release builds trust the hash.
+
+#![forbid(unsafe_code)]
+
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+
+use rayon::prelude::*;
+use reflex_arena::Arena;
+use reflex_codegen::{emit_page as emit_page_module, CodeBuffer};
+use reflex_ir::parse_page;
+use xxhash_rust::xxh3::xxh3_64;
+
+/// Content hash. Stable across process restarts.
+pub type ContentHash = u64;
+
+/// Compute the canonical content hash for a serialized IR blob.
+#[inline]
+pub fn hash_content(bytes: &[u8]) -> ContentHash {
+ xxh3_64(bytes)
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum DbError {
+ #[error("page parse failed: {0}")]
+ Parse(#[from] reflex_ir::ParseError),
+ #[error("emit produced non-utf8 output: {0}")]
+ Utf8(#[from] std::string::FromUtf8Error),
+}
+
+/// One per long-lived compiler session. Cheap to clone (`Arc` inside).
+#[derive(Default, Clone)]
+pub struct CompilerDb {
+ inner: Arc<Mutex<DbInner>>,
+}
+
+#[derive(Default)]
+struct DbInner {
+ /// `(route_ident, content_hash) -> rendered JS`. Route ident is part of
+ /// the key because the emitted module declares
+ /// `export default function <route_ident>()`, which depends on the ident
+ /// even when the bytes are identical.
+ page_cache: HashMap<(String, ContentHash), Arc<str>>,
+ /// Optional cap on `page_cache` size. `None` = unbounded.
+ cache_cap: Option<usize>,
+}
+
+impl CompilerDb {
+ pub fn new() -> Self {
+ Self::default()
+ }
+
+ /// Cap the page cache. Oldest-by-insertion eviction. Set to `None` for
+ /// unbounded (default).
+ pub fn set_cache_capacity(&self, cap: Option<usize>) {
+ self.inner.lock().unwrap().cache_cap = cap;
+ }
+
+ /// Compute the JS source for one page. On cache hit, returns the stored
+ /// `Arc<str>` without re-parsing.
+ pub fn emit_page(&self, route_ident: &str, bytes: &[u8]) -> Result<Arc<str>, DbError> {
+ let hash = hash_content(bytes);
+ let key = (route_ident.to_owned(), hash);
+
+ if let Some(cached) = self.inner.lock().unwrap().page_cache.get(&key) {
+ return Ok(cached.clone());
+ }
+
+ let rendered = compile_one_page(route_ident, bytes)?;
+ let rendered: Arc<str> = Arc::from(rendered.into_boxed_str());
+
+ let mut inner = self.inner.lock().unwrap();
+ if let Some(cap) = inner.cache_cap {
+ if inner.page_cache.len() >= cap {
+ if let Some(k) = inner.page_cache.keys().next().cloned() {
+ inner.page_cache.remove(&k);
+ }
+ }
+ }
+ inner.page_cache.insert(key, rendered.clone());
+ Ok(rendered)
+ }
+
+ pub fn clear(&self) {
+ self.inner.lock().unwrap().page_cache.clear();
+ }
+
+ pub fn cache_len(&self) -> usize {
+ self.inner.lock().unwrap().page_cache.len()
+ }
+
+ /// Compile many pages in parallel. Returns results in the same order as
+ /// the input. See plan D11 — rayon over pages.
+ ///
+ /// Cache hits avoid any work, so the parallel path only pays for genuine
+ /// cache misses. Threading is provided by the global rayon pool; the
+ /// caller doesn't need to set one up.
+ pub fn emit_pages_parallel(
+ &self,
+ inputs: &[(String, Vec<u8>)],
+ ) -> Vec<Result<Arc<str>, DbError>> {
+ inputs
+ .par_iter()
+ .map(|(ident, bytes)| self.emit_page(ident, bytes))
+ .collect()
+ }
+}
+
+fn compile_one_page(route_ident: &str, bytes: &[u8]) -> Result<String, DbError> {
+ let arena = Arena::with_capacity(bytes.len() * 4);
+ let page = parse_page(&arena, bytes)?;
+ let mut buf = CodeBuffer::with_capacity(bytes.len() * 2);
+ emit_page_module(&mut buf, &page, route_ident);
+ Ok(String::from_utf8(buf.into_bytes())?)
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_ir::parse::test_helpers::tiny_page_bytes;
+
+ #[test]
+ fn first_call_is_miss_second_is_hit() {
+ let db = CompilerDb::new();
+ let bytes = tiny_page_bytes();
+ assert_eq!(db.cache_len(), 0);
+ let a = db.emit_page("Index", &bytes).unwrap();
+ assert_eq!(db.cache_len(), 1);
+ let b = db.emit_page("Index", &bytes).unwrap();
+ // Arc identity check — same string, no recompile.
+ assert!(Arc::ptr_eq(&a, &b));
+ }
+
+ #[test]
+ fn different_idents_are_separate_entries() {
+ let db = CompilerDb::new();
+ let bytes = tiny_page_bytes();
+ let _a = db.emit_page("Index", &bytes).unwrap();
+ let _b = db.emit_page("About", &bytes).unwrap();
+ assert_eq!(db.cache_len(), 2);
+ }
+
+ #[test]
+ fn cache_cap_evicts() {
+ let db = CompilerDb::new();
+ db.set_cache_capacity(Some(1));
+ let bytes = tiny_page_bytes();
+ let _ = db.emit_page("A", &bytes).unwrap();
+ let _ = db.emit_page("B", &bytes).unwrap();
+ assert_eq!(db.cache_len(), 1);
+ }
+
+ #[test]
+ fn xxh3_stable_under_repeat() {
+ let a = hash_content(b"hello world");
+ let b = hash_content(b"hello world");
+ assert_eq!(a, b);
+ }
+
+ #[test]
+ fn parallel_emit_preserves_order_and_caches() {
+ let db = CompilerDb::new();
+ let bytes = tiny_page_bytes();
+ let inputs = vec![
+ ("A".to_owned(), bytes.clone()),
+ ("B".to_owned(), bytes.clone()),
+ ("C".to_owned(), bytes.clone()),
+ ];
+ let out = db.emit_pages_parallel(&inputs);
+ assert_eq!(out.len(), 3);
+ for r in &out {
+ r.as_ref().unwrap();
+ }
+ assert_eq!(db.cache_len(), 3);
+
+ // Re-run: every entry is a cache hit, so the Arc pointers should be
+ // identical to the first run's.
+ let out2 = db.emit_pages_parallel(&inputs);
+ for (a, b) in out.iter().zip(out2.iter()) {
+ assert!(Arc::ptr_eq(a.as_ref().unwrap(), b.as_ref().unwrap()));
+ }
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_intern/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_intern/Cargo.toml
new file mode 100644
index 00000000000..604a26cda08
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_intern/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "reflex_intern"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
diff --git a/packages/reflex-compiler-rust/crates/reflex_intern/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_intern/src/lib.rs
new file mode 100644
index 00000000000..aeb3eb257ed
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_intern/src/lib.rs
@@ -0,0 +1,164 @@
+//! Symbol interning. See plan §3, R5.
+//!
+//! Every identifier and namespace string in the IR is a `Symbol(u32)`. Equality
+//! and hashing of identifiers becomes `u32 == u32`; the string materializes
+//! only at final byte-emit time.
+//!
+//! This iteration ships a single per-process interner behind a `Mutex`. The
+//! plan's R5/R8 target is per-thread sharded interners with `#[thread_local]`,
+//! deferred until profiling shows the lock matters. The public API
+//! (`Symbol`, `intern`, `resolve`, `well_known`) is stable across that change.
+
+use std::collections::HashMap;
+use std::sync::{Mutex, OnceLock};
+
+/// Interned string identifier.
+///
+/// `Symbol(0)` is reserved for the empty string so `Symbol::default()` is a
+/// valid no-op. Other symbols are assigned in insertion order.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
+pub struct Symbol(pub u32);
+
+impl Symbol {
+ pub const EMPTY: Symbol = Symbol(0);
+
+ #[inline]
+ pub fn as_u32(self) -> u32 {
+ self.0
+ }
+}
+
+impl Default for Symbol {
+ fn default() -> Self {
+ Self::EMPTY
+ }
+}
+
+struct Interner {
+ /// Indexed by `Symbol.0 as usize`. Strings live forever (leaked into
+ /// `'static` so callers don't pay a copy at resolve time).
+ strings: Vec<&'static str>,
+ lookup: HashMap<&'static str, Symbol>,
+}
+
+impl Interner {
+ fn new() -> Self {
+ let mut me = Self {
+ strings: Vec::with_capacity(64),
+ lookup: HashMap::with_capacity(64),
+ };
+ let s = me.intern_inner("");
+ debug_assert_eq!(s, Symbol::EMPTY);
+ for name in WELL_KNOWN {
+ me.intern_inner(name);
+ }
+ me
+ }
+
+ fn intern_inner(&mut self, s: &str) -> Symbol {
+ if let Some(&sym) = self.lookup.get(s) {
+ return sym;
+ }
+ let leaked: &'static str = Box::leak(s.to_owned().into_boxed_str());
+ let sym = Symbol(self.strings.len() as u32);
+ self.strings.push(leaked);
+ self.lookup.insert(leaked, sym);
+ sym
+ }
+
+ fn resolve(&self, sym: Symbol) -> Option<&'static str> {
+ self.strings.get(sym.0 as usize).copied()
+ }
+}
+
+fn interner() -> &'static Mutex<Interner> {
+ static IT: OnceLock<Mutex<Interner>> = OnceLock::new();
+ IT.get_or_init(|| Mutex::new(Interner::new()))
+}
+
+/// Common identifiers pre-interned at startup so they get low IDs and are
+/// already in the table when the first compile starts.
+const WELL_KNOWN: &[&str] = &[
+ "rx.",
+ "$/",
+ "reflex___state____",
+ "__reflex_",
+ "react",
+ "useState",
+ "useEffect",
+ "useCallback",
+ "useMemo",
+ "useRef",
+ "useContext",
+ "useReducer",
+ "jsx",
+ "Fragment",
+ "children",
+ "key",
+ "ref",
+ "className",
+ "style",
+ "onClick",
+ "onChange",
+ "onSubmit",
+];
+
+/// Intern a string, returning its `Symbol`.
+pub fn intern(s: &str) -> Symbol {
+ interner().lock().unwrap().intern_inner(s)
+}
+
+/// Resolve a `Symbol` back to its string. Returns `None` if the symbol was
+/// created by a different interner instance (shouldn't happen in normal use).
+pub fn resolve(sym: Symbol) -> Option<&'static str> {
+ interner().lock().unwrap().resolve(sym)
+}
+
+/// Resolve, panicking on unknown symbol. Use only when an unknown symbol is a
+/// program bug, not a recoverable error.
+pub fn resolve_unchecked(sym: Symbol) -> &'static str {
+ resolve(sym).expect("symbol not in interner")
+}
+
+/// Look up the `Symbol` for a known-pre-interned string. Returns `None` if the
+/// string was never interned. Useful for hot-path comparisons that want to
+/// avoid `intern()`'s mutex.
+pub fn well_known(s: &str) -> Option<Symbol> {
+ interner().lock().unwrap().lookup.get(s).copied()
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn empty_is_symbol_zero() {
+ assert_eq!(intern(""), Symbol::EMPTY);
+ }
+
+ #[test]
+ fn same_string_same_symbol() {
+ let a = intern("foo_bar");
+ let b = intern("foo_bar");
+ assert_eq!(a, b);
+ }
+
+ #[test]
+ fn different_strings_different_symbols() {
+ let a = intern("alpha");
+ let b = intern("beta");
+ assert_ne!(a, b);
+ }
+
+ #[test]
+ fn resolve_round_trip() {
+ let s = intern("hello_world");
+ assert_eq!(resolve(s).unwrap(), "hello_world");
+ }
+
+ #[test]
+ fn well_known_returns_some() {
+ assert!(well_known("rx.").is_some());
+ assert!(well_known("react").is_some());
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_ir/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_ir/Cargo.toml
new file mode 100644
index 00000000000..e2d1bc8f9da
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_ir/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "reflex_ir"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+reflex_arena = { workspace = true }
+reflex_intern = { workspace = true }
+bumpalo = { workspace = true }
+rmp = { workspace = true }
+thiserror = { workspace = true }
diff --git a/packages/reflex-compiler-rust/crates/reflex_ir/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_ir/src/lib.rs
new file mode 100644
index 00000000000..134510ef467
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_ir/src/lib.rs
@@ -0,0 +1,368 @@
+//! IR enum types. See plan §3.2, §4.
+//!
+//! Every variant is `Copy`. Slices and string refs borrow the arena (`'a`).
+//! Public field access is allowed within the workspace; the plan's R4
+//! corollary (Salsa-tracked accessors) wraps these reads in `reflex_db`, but
+//! the underlying enum has to be matchable for the visitor pattern in `D6`.
+//!
+//! Wire-format compatibility: enum discriminants are explicitly assigned so
+//! the msgpack parser in `reflex_py` can read a `u8` kind byte and `match`
+//! straight into a constructor without lookup tables.
+
+#![forbid(unsafe_code)]
+
+use reflex_intern::Symbol;
+
+pub mod parse;
+pub mod visitor;
+
+pub use parse::{parse_global_state, parse_page, parse_plugin_manifest, parse_theme, ParseError};
+pub use visitor::{walk_component, walk_event_handler, walk_match_arm, walk_page, walk_value, IrVisitor};
+
+/// Stable hash of a node's canonical bytes. Used as the Salsa cache key and as
+/// the React `key=` value for memoized subtrees.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Default)]
+pub struct NodeId(pub u64);
+
+/// Per-`CompilerSession` interned Python source file. Survives revisions.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Default)]
+pub struct PyFileId(pub u32);
+
+/// Source location for diagnostics. `line` and `col` are 1-based; `(0, 0)`
+/// means "synthetic / no source location" (e.g. generated Fragment wrappers).
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+pub struct SourceLoc {
+ pub file: PyFileId,
+ pub line: u32,
+ pub col: u32,
+}
+
+impl SourceLoc {
+ pub const SYNTHETIC: SourceLoc = SourceLoc {
+ file: PyFileId(0),
+ line: 0,
+ col: 0,
+ };
+}
+
+/// VarData carries the hidden state that travels with a JS expression so the
+/// IR consumer can hoist imports, register hooks, and order computed-var
+/// dependencies. Strings live in the arena.
+#[derive(Clone, Copy, Debug)]
+pub struct VarData<'a> {
+ /// Hook source fragments this expression depends on (raw JS strings).
+ pub hooks: &'a [&'a str],
+ /// `(module, name)` imports this expression requires.
+ pub imports: &'a [(Symbol, Symbol)],
+ /// Owning state class name, if any (`State`, `MySubState`, …).
+ pub state: Option<Symbol>,
+ /// Vars this var depends on (interned `_js_expr` strings).
+ pub deps: &'a [Symbol],
+ /// Position hint for hoisting (`None` = no constraint, else 0-based).
+ pub position: Option<u8>,
+ /// Component memoization wrappers this expression needs at hoist time.
+ pub components: &'a [Symbol],
+}
+
+impl<'a> VarData<'a> {
+ pub const EMPTY: VarData<'static> = VarData {
+ hooks: &[],
+ imports: &[],
+ state: None,
+ deps: &[],
+ position: None,
+ components: &[],
+ };
+}
+
+/// A JS-expressible value embedded in IR. `JsExpr` is the dominant case —
+/// Python pre-bakes the JS source and ships it along with VarData.
+#[derive(Clone, Copy, Debug)]
+pub enum Value<'a> {
+ /// Pre-baked JS source string + the metadata needed to hoist its
+ /// imports/hooks. The string is the literal text spliced into JSX.
+ JsExpr {
+ expr: &'a str,
+ var_data: VarData<'a>,
+ },
+ /// Compile-time literal (no JS evaluation needed at render time).
+ Literal(Literal<'a>),
+ /// Reference to another named symbol (e.g. a state class identifier).
+ Ref(Symbol),
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum Literal<'a> {
+ Null,
+ Bool(bool),
+ Int(i64),
+ Float(f64),
+ /// Already-JSON-quoted string (the Python emitter handled escaping).
+ Str(&'a str),
+}
+
+/// A single `onClick`-style binding.
+#[derive(Clone, Copy, Debug)]
+pub struct EventHandler<'a> {
+ /// Event trigger name (`"on_click"`, `"on_change"`, …).
+ pub trigger: Symbol,
+ /// JS expression bound to the trigger.
+ pub expr: &'a str,
+ pub var_data: VarData<'a>,
+}
+
+/// A React-hook fragment hoisted to the top of the page render function.
+#[derive(Clone, Copy, Debug)]
+pub struct Hook<'a> {
+ /// Raw JS source for the hook body.
+ pub code: &'a str,
+ /// Vars this hook depends on (for ordering).
+ pub deps: &'a [Symbol],
+ /// Position bucket (`0` = useState/useEffect setup, `1` = derived, …).
+ pub position: u8,
+}
+
+/// A single `rx.match(...)` arm.
+#[derive(Clone, Copy, Debug)]
+pub struct MatchArm<'a> {
+ pub case: Value<'a>,
+ pub body: &'a Component<'a>,
+}
+
+/// The Component IR tree.
+///
+/// `#[repr(C, u8)]` pins the discriminant to a `u8` and gives the layout a
+/// stable shape so the Salsa cache and msgpack decoder can rely on it. The
+/// remaining payload is laid out C-style, which trades a small amount of
+/// padding for predictable pointer-stride into slices of `Component`.
+#[repr(C, u8)]
+#[derive(Clone, Copy, Debug)]
+pub enum Component<'a> {
+ Element {
+ tag: Symbol,
+ props: &'a [(Symbol, Value<'a>)],
+ children: &'a [Component<'a>],
+ event_handlers: &'a [EventHandler<'a>],
+ hooks: &'a [Hook<'a>],
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 0,
+ Text {
+ value: &'a str,
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 1,
+ Foreach {
+ iter: Value<'a>,
+ body: &'a Component<'a>,
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 2,
+ Cond {
+ test: Value<'a>,
+ then: &'a Component<'a>,
+ else_: Option<&'a Component<'a>>,
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 3,
+ Match {
+ value: Value<'a>,
+ arms: &'a [MatchArm<'a>],
+ default: Option<&'a Component<'a>>,
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 4,
+ Memoize {
+ inner: &'a Component<'a>,
+ key: NodeId,
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 5,
+ Fragment {
+ children: &'a [Component<'a>],
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 6,
+ /// JSX value inline (e.g. `{state.title}`) — emits as a single expression
+ /// with no surrounding tag. Distinct from `Text`, which double-quotes.
+ Expr {
+ value: Value<'a>,
+ id: NodeId,
+ source_loc: SourceLoc,
+ } = 7,
+}
+
+impl<'a> Component<'a> {
+ #[inline]
+ pub fn id(&self) -> NodeId {
+ match self {
+ Component::Element { id, .. }
+ | Component::Text { id, .. }
+ | Component::Foreach { id, .. }
+ | Component::Cond { id, .. }
+ | Component::Match { id, .. }
+ | Component::Memoize { id, .. }
+ | Component::Fragment { id, .. }
+ | Component::Expr { id, .. } => *id,
+ }
+ }
+
+ #[inline]
+ pub fn source_loc(&self) -> SourceLoc {
+ match self {
+ Component::Element { source_loc, .. }
+ | Component::Text { source_loc, .. }
+ | Component::Foreach { source_loc, .. }
+ | Component::Cond { source_loc, .. }
+ | Component::Match { source_loc, .. }
+ | Component::Memoize { source_loc, .. }
+ | Component::Fragment { source_loc, .. }
+ | Component::Expr { source_loc, .. } => *source_loc,
+ }
+ }
+
+ /// Wire-format discriminant. Matches the `kind` field in the msgpack
+ /// schema (§4.1).
+ #[inline]
+ pub fn kind(&self) -> u8 {
+ match self {
+ Component::Element { .. } => 0,
+ Component::Text { .. } => 1,
+ Component::Foreach { .. } => 2,
+ Component::Cond { .. } => 3,
+ Component::Match { .. } => 4,
+ Component::Memoize { .. } => 5,
+ Component::Fragment { .. } => 6,
+ Component::Expr { .. } => 7,
+ }
+ }
+}
+
+/// Top-level page IR. The unit of Salsa input granularity (§3.3 / D5).
+///
+/// **Schema v2 additions** (`component_imports`, `state_bindings`,
+/// `needs_ref`): the Reflex React runtime expects the page module to
+/// import its component classes, wire `useContext(StateContexts.*)` for
+/// each state class used by the page, and (for any element with an `id`
+/// prop) wire `useRef`. The bridge harvests these from the Component
+/// tree; the Rust codegen emits the corresponding boilerplate.
+#[derive(Clone, Copy, Debug)]
+pub struct Page<'a> {
+ /// Wire schema version (`PageIR.v`).
+ pub schema_version: u32,
+ pub route: &'a str,
+ pub root: &'a Component<'a>,
+ pub title: Option<&'a str>,
+ pub meta: &'a [Meta<'a>],
+ /// Python source files this page depends on (drives source-map back-mapping).
+ pub source_files: &'a [PyFileId],
+ /// Component-class imports required at module scope:
+ /// `import { <name_in_module> as <local_alias> } from "<module>";`.
+ /// Encoded as `(module, alias)` pairs where `module` is the JS module
+ /// specifier and `alias` is the component identifier used inside JSX.
+ pub component_imports: &'a [(Symbol, Symbol)],
+ /// State-context identifiers needed via
+ /// `useContext(StateContexts.<binding>)`. Each one becomes a `const`
+ /// binding at the top of the render function.
+ pub state_bindings: &'a [Symbol],
+ /// Whether the page references any `id` prop, requiring a `useRef`
+ /// setup at the top of the render function.
+ pub needs_ref: bool,
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct Meta<'a> {
+ pub name: Symbol,
+ pub content: &'a str,
+}
+
+/// Theme IR (§4.2).
+#[derive(Clone, Copy, Debug)]
+pub struct Theme<'a> {
+ pub schema_version: u32,
+ pub tokens: &'a [(Symbol, &'a str)],
+ pub global_style: &'a str,
+ pub appearance: &'a str,
+}
+
+/// GlobalState IR (§4.3).
+///
+/// `initial_state` and `client_storage` are kept as raw msgpack-encoded blobs
+/// because their shape is recursive `Any` — Rust never inspects them; it
+/// just splices them into the emitted JS shell as JSON literals.
+#[derive(Clone, Copy, Debug)]
+pub struct GlobalState<'a> {
+ pub schema_version: u32,
+ /// Pre-JSON-encoded initial state.
+ pub initial_state_json: &'a [u8],
+ /// Pre-JSON-encoded client storage config.
+ pub client_storage_json: &'a [u8],
+ pub computed_var_deps: &'a [ComputedVarDep<'a>],
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct ComputedVarDep<'a> {
+ pub var: Symbol,
+ pub depends_on: &'a [Symbol],
+}
+
+/// Manifest of installed plugins. The plugin protocol is three-phase (§4.7);
+/// the manifest is all Rust ever sees — actual `pre_compile`/`enter_leave`/
+/// `post_build` code stays in Python.
+#[derive(Clone, Copy, Debug)]
+pub struct PluginManifest<'a> {
+ pub schema_version: u32,
+ pub plugins: &'a [PluginEntry<'a>],
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct PluginEntry<'a> {
+ pub name: Symbol,
+ pub static_assets: &'a [(Symbol, &'a [u8])],
+ pub stylesheet_imports: &'a [Symbol],
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ fn assert_copy<T: Copy>() {}
+ fn assert_no_drop<T>() {
+ assert!(!std::mem::needs_drop::<T>());
+ }
+
+ #[test]
+ fn component_is_copy() {
+ assert_copy::<Component<'_>>();
+ assert_copy::<Value<'_>>();
+ assert_copy::<EventHandler<'_>>();
+ assert_copy::<Hook<'_>>();
+ assert_copy::<VarData<'_>>();
+ assert_copy::<MatchArm<'_>>();
+ assert_copy::<Page<'_>>();
+ assert_copy::<Theme<'_>>();
+ assert_copy::<GlobalState<'_>>();
+ assert_copy::<PluginManifest<'_>>();
+ }
+
+ #[test]
+ fn r2_no_drop() {
+ assert_no_drop::<Component<'_>>();
+ assert_no_drop::<Value<'_>>();
+ assert_no_drop::<EventHandler<'_>>();
+ assert_no_drop::<Hook<'_>>();
+ assert_no_drop::<VarData<'_>>();
+ assert_no_drop::<MatchArm<'_>>();
+ assert_no_drop::<Page<'_>>();
+ }
+
+ #[test]
+ fn component_kind_matches_discriminant() {
+ let id = NodeId(0);
+ let loc = SourceLoc::SYNTHETIC;
+ let text = Component::Text { value: "hi", id, source_loc: loc };
+ let frag = Component::Fragment { children: &[], id, source_loc: loc };
+ assert_eq!(text.kind(), 1);
+ assert_eq!(frag.kind(), 6);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_ir/src/parse.rs b/packages/reflex-compiler-rust/crates/reflex_ir/src/parse.rs
new file mode 100644
index 00000000000..3132af8c6e3
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_ir/src/parse.rs
@@ -0,0 +1,959 @@
+//! Hand-rolled msgpack parser for the §4 wire format. See plan §3.4, D4, R1.
+//!
+//! Wire format is positional msgpack arrays. The parser borrows `&str`
+//! directly from the input bytes where possible, copying into the arena only
+//! when the lifetime must survive the input slice (e.g. ID strings stored in
+//! VarData that the codegen will keep referencing). Spike measurement: 25×
+//! faster than rmp-serde at 10k nodes.
+//!
+//! Schema versions:
+//! 1 — current; per §4.1.
+//!
+//! Wire shapes (see RUST_REWRITE_PLAN.md §4 for the canonical definition):
+//!
+//! ```text
+//! PageIR = [v:u32, route:str, root:Component, title:str|nil,
+//! meta:[Meta], source_files:[u32]]
+//! Component = [kind:u8, ...payload] (payload depends on kind)
+//! Element(0) = [0, tag:str, props:[[name:str, Value]], children:[Component],
+//! events:[EventHandler], hooks:[Hook], id:u64, loc:[u32,u32,u32]]
+//! Text(1) = [1, value:str, id:u64, loc]
+//! Foreach(2) = [2, iter:Value, body:Component, id:u64, loc]
+//! Cond(3) = [3, test:Value, then:Component, else:Component|nil, id:u64, loc]
+//! Match(4) = [4, value:Value, arms:[MatchArm], default:Component|nil, id:u64, loc]
+//! Memoize(5) = [5, inner:Component, key:u64, id:u64, loc]
+//! Fragment(6) = [6, children:[Component], id:u64, loc]
+//! Expr(7) = [7, value:Value, id:u64, loc]
+//! Value = [kind:u8, ...payload]
+//! JsExpr(0) = [0, expr:str, VarData]
+//! Literal(1) = [1, Literal]
+//! Ref(2) = [2, name:str]
+//! Literal = [kind:u8, ...payload]
+//! Null(0) = [0]
+//! Bool(1) = [1, bool]
+//! Int(2) = [2, i64]
+//! Float(3) = [3, f64]
+//! Str(4) = [4, str]
+//! VarData = [hooks:[str], imports:[[module:str, name:str]],
+//! state:str|nil, deps:[str], position:u8|nil, components:[str]]
+//! EventHandler = [trigger:str, expr:str, VarData]
+//! Hook = [code:str, deps:[str], position:u8]
+//! MatchArm = [case:Value, body:Component]
+//! Meta = [name:str, content:str]
+//! SourceLoc = [file_id:u32, line:u32, col:u32]
+//! ```
+
+use std::convert::TryFrom;
+
+use reflex_arena::Arena;
+use reflex_intern::{intern, Symbol};
+use rmp::decode::{self, RmpRead};
+use rmp::Marker;
+
+use crate::{
+ Component, ComputedVarDep, EventHandler, GlobalState, Hook, Literal, MatchArm, Meta, NodeId,
+ Page, PluginEntry, PluginManifest, PyFileId, SourceLoc, Theme, Value, VarData,
+};
+
+pub const SCHEMA_VERSION: u32 = 2;
+
+#[derive(Debug, thiserror::Error)]
+pub enum ParseError {
+ #[error("unsupported schema version {0}; this build accepts {SCHEMA_VERSION}")]
+ UnsupportedVersion(u32),
+ #[error("malformed msgpack: {0}")]
+ Msgpack(String),
+ #[error("invalid utf-8: {0}")]
+ Utf8(#[from] std::str::Utf8Error),
+ #[error("unknown component kind {0}")]
+ UnknownComponentKind(u8),
+ #[error("unknown value kind {0}")]
+ UnknownValueKind(u8),
+ #[error("unknown literal kind {0}")]
+ UnknownLiteralKind(u8),
+ #[error("expected array of length {expected}, got {actual}")]
+ BadArrayLen { expected: u32, actual: u32 },
+ #[error("integer overflow: {0}")]
+ IntOverflow(&'static str),
+}
+
+type Result<T> = std::result::Result<T, ParseError>;
+
+fn map_msgpack<E: std::fmt::Display>(e: E) -> ParseError {
+ ParseError::Msgpack(e.to_string())
+}
+
+// ---- Primitive readers ------------------------------------------------------
+
+#[inline]
+fn read_array_len(buf: &mut &[u8]) -> Result<u32> {
+ decode::read_array_len(buf).map_err(map_msgpack)
+}
+
+#[inline]
+fn read_str_borrowed<'a>(buf: &mut &'a [u8]) -> Result<&'a str> {
+ let len = decode::read_str_len(buf).map_err(map_msgpack)? as usize;
+ if buf.len() < len {
+ return Err(ParseError::Msgpack("short read on str".into()));
+ }
+ let (head, rest) = buf.split_at(len);
+ *buf = rest;
+ Ok(std::str::from_utf8(head)?)
+}
+
+#[inline]
+fn read_bin_borrowed<'a>(buf: &mut &'a [u8]) -> Result<&'a [u8]> {
+ let len = decode::read_bin_len(buf).map_err(map_msgpack)? as usize;
+ if buf.len() < len {
+ return Err(ParseError::Msgpack("short read on bin".into()));
+ }
+ let (head, rest) = buf.split_at(len);
+ *buf = rest;
+ Ok(head)
+}
+
+#[inline]
+fn read_u32(buf: &mut &[u8]) -> Result<u32> {
+ let n = decode::read_int::<i64, _>(buf).map_err(map_msgpack)?;
+ u32::try_from(n).map_err(|_| ParseError::IntOverflow("u32"))
+}
+
+#[inline]
+fn read_u64(buf: &mut &[u8]) -> Result<u64> {
+ let raw: i128 = decode::read_int::<i128, _>(buf).map_err(map_msgpack)?;
+ u64::try_from(raw).map_err(|_| ParseError::IntOverflow("u64"))
+}
+
+#[inline]
+fn read_i64(buf: &mut &[u8]) -> Result<i64> {
+ decode::read_int::<i64, _>(buf).map_err(map_msgpack)
+}
+
+#[inline]
+fn read_f64(buf: &mut &[u8]) -> Result<f64> {
+ decode::read_f64(buf).map_err(map_msgpack)
+}
+
+#[inline]
+fn read_bool(buf: &mut &[u8]) -> Result<bool> {
+ decode::read_bool(buf).map_err(map_msgpack)
+}
+
+#[inline]
+fn read_u8(buf: &mut &[u8]) -> Result<u8> {
+ buf.read_u8().map_err(map_msgpack)
+}
+
+/// Peek the next marker and consume it if it's `nil`. Returns `true` when nil
+/// was consumed, `false` when the marker is something else (and the cursor is
+/// unchanged).
+#[inline]
+fn try_read_nil(buf: &mut &[u8]) -> Result<bool> {
+ if buf.is_empty() {
+ return Err(ParseError::Msgpack("unexpected end while peeking nil".into()));
+ }
+ let m = Marker::from_u8(buf[0]);
+ if matches!(m, Marker::Null) {
+ *buf = &buf[1..];
+ Ok(true)
+ } else {
+ Ok(false)
+ }
+}
+
+#[inline]
+fn read_str_or_nil_borrowed<'a>(buf: &mut &'a [u8]) -> Result<Option<&'a str>> {
+ if try_read_nil(buf)? {
+ Ok(None)
+ } else {
+ Ok(Some(read_str_borrowed(buf)?))
+ }
+}
+
+#[inline]
+fn read_u8_or_nil(buf: &mut &[u8]) -> Result<Option<u8>> {
+ if try_read_nil(buf)? {
+ Ok(None)
+ } else {
+ let n = decode::read_int::<u16, _>(buf).map_err(map_msgpack)?;
+ u8::try_from(n)
+ .map(Some)
+ .map_err(|_| ParseError::IntOverflow("u8"))
+ }
+}
+
+#[inline]
+fn intern_str(s: &str) -> Symbol {
+ intern(s)
+}
+
+// ---- Array-of-Symbol / array-of-strings / array-of-(Symbol,Symbol) ----------
+
+#[inline]
+fn read_symbol_array<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<&'a [Symbol]> {
+ let n = read_array_len(buf)? as usize;
+ let mut tmp: bumpalo::collections::Vec<Symbol> =
+ bumpalo::collections::Vec::with_capacity_in(n, arena.bump());
+ for _ in 0..n {
+ let s = read_str_borrowed(buf)?;
+ tmp.push(intern_str(s));
+ }
+ Ok(tmp.into_bump_slice())
+}
+
+#[inline]
+fn read_str_array_owned<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<&'a [&'a str]> {
+ let n = read_array_len(buf)? as usize;
+ let mut tmp: bumpalo::collections::Vec<&'a str> =
+ bumpalo::collections::Vec::with_capacity_in(n, arena.bump());
+ for _ in 0..n {
+ let s = read_str_borrowed(buf)?;
+ tmp.push(arena.alloc_str(s));
+ }
+ Ok(tmp.into_bump_slice())
+}
+
+#[inline]
+fn read_symbol_pair_array<'a>(
+ arena: &'a Arena,
+ buf: &mut &[u8],
+) -> Result<&'a [(Symbol, Symbol)]> {
+ let n = read_array_len(buf)? as usize;
+ let mut tmp: bumpalo::collections::Vec<(Symbol, Symbol)> =
+ bumpalo::collections::Vec::with_capacity_in(n, arena.bump());
+ for _ in 0..n {
+ let pair_len = read_array_len(buf)?;
+ if pair_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: pair_len,
+ });
+ }
+ let a = intern_str(read_str_borrowed(buf)?);
+ let b = intern_str(read_str_borrowed(buf)?);
+ tmp.push((a, b));
+ }
+ Ok(tmp.into_bump_slice())
+}
+
+// ---- Structured readers -----------------------------------------------------
+
+fn read_source_loc(buf: &mut &[u8]) -> Result<SourceLoc> {
+ let arr_len = read_array_len(buf)?;
+ if arr_len != 3 {
+ return Err(ParseError::BadArrayLen {
+ expected: 3,
+ actual: arr_len,
+ });
+ }
+ let file = PyFileId(read_u32(buf)?);
+ let line = read_u32(buf)?;
+ let col = read_u32(buf)?;
+ Ok(SourceLoc { file, line, col })
+}
+
+fn read_var_data<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<VarData<'a>> {
+ let arr_len = read_array_len(buf)?;
+ if arr_len != 6 {
+ return Err(ParseError::BadArrayLen {
+ expected: 6,
+ actual: arr_len,
+ });
+ }
+ let hooks = read_str_array_owned(arena, buf)?;
+ let imports = read_symbol_pair_array(arena, buf)?;
+ let state = read_str_or_nil_borrowed(buf)?.map(intern_str);
+ let deps = read_symbol_array(arena, buf)?;
+ let position = read_u8_or_nil(buf)?;
+ let components = read_symbol_array(arena, buf)?;
+ Ok(VarData {
+ hooks,
+ imports,
+ state,
+ deps,
+ position,
+ components,
+ })
+}
+
+fn read_literal<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<Literal<'a>> {
+ let arr_len = read_array_len(buf)?;
+ let kind = read_u8(buf)?;
+ match kind {
+ 0 => {
+ if arr_len != 1 {
+ return Err(ParseError::BadArrayLen {
+ expected: 1,
+ actual: arr_len,
+ });
+ }
+ Ok(Literal::Null)
+ }
+ 1 => {
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ Ok(Literal::Bool(read_bool(buf)?))
+ }
+ 2 => {
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ Ok(Literal::Int(read_i64(buf)?))
+ }
+ 3 => {
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ Ok(Literal::Float(read_f64(buf)?))
+ }
+ 4 => {
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ let s = read_str_borrowed(buf)?;
+ Ok(Literal::Str(arena.alloc_str(s)))
+ }
+ _ => Err(ParseError::UnknownLiteralKind(kind)),
+ }
+}
+
+fn read_value<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<Value<'a>> {
+ let arr_len = read_array_len(buf)?;
+ let kind = read_u8(buf)?;
+ match kind {
+ 0 => {
+ if arr_len != 3 {
+ return Err(ParseError::BadArrayLen {
+ expected: 3,
+ actual: arr_len,
+ });
+ }
+ let expr = arena.alloc_str(read_str_borrowed(buf)?);
+ let var_data = read_var_data(arena, buf)?;
+ Ok(Value::JsExpr { expr, var_data })
+ }
+ 1 => {
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ Ok(Value::Literal(read_literal(arena, buf)?))
+ }
+ 2 => {
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ Ok(Value::Ref(intern_str(read_str_borrowed(buf)?)))
+ }
+ _ => Err(ParseError::UnknownValueKind(kind)),
+ }
+}
+
+fn read_event_handler<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<EventHandler<'a>> {
+ let arr_len = read_array_len(buf)?;
+ if arr_len != 3 {
+ return Err(ParseError::BadArrayLen {
+ expected: 3,
+ actual: arr_len,
+ });
+ }
+ let trigger = intern_str(read_str_borrowed(buf)?);
+ let expr = arena.alloc_str(read_str_borrowed(buf)?);
+ let var_data = read_var_data(arena, buf)?;
+ Ok(EventHandler {
+ trigger,
+ expr,
+ var_data,
+ })
+}
+
+fn read_hook<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<Hook<'a>> {
+ let arr_len = read_array_len(buf)?;
+ if arr_len != 3 {
+ return Err(ParseError::BadArrayLen {
+ expected: 3,
+ actual: arr_len,
+ });
+ }
+ let code = arena.alloc_str(read_str_borrowed(buf)?);
+ let deps = read_symbol_array(arena, buf)?;
+ let n = decode::read_int::<u16, _>(buf).map_err(map_msgpack)?;
+ let position = u8::try_from(n).map_err(|_| ParseError::IntOverflow("u8"))?;
+ Ok(Hook {
+ code,
+ deps,
+ position,
+ })
+}
+
+fn read_match_arm<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<MatchArm<'a>> {
+ let arr_len = read_array_len(buf)?;
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ let case = read_value(arena, buf)?;
+ let body = arena.alloc(read_component(arena, buf)?);
+ Ok(MatchArm { case, body: &*body })
+}
+
+fn read_meta<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<Meta<'a>> {
+ let arr_len = read_array_len(buf)?;
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ let name = intern_str(read_str_borrowed(buf)?);
+ let content = arena.alloc_str(read_str_borrowed(buf)?);
+ Ok(Meta { name, content })
+}
+
+fn read_component<'a>(arena: &'a Arena, buf: &mut &[u8]) -> Result<Component<'a>> {
+ let arr_len = read_array_len(buf)?;
+ let kind = read_u8(buf)?;
+ match kind {
+ 0 => {
+ if arr_len != 8 {
+ return Err(ParseError::BadArrayLen {
+ expected: 8,
+ actual: arr_len,
+ });
+ }
+ let tag = intern_str(read_str_borrowed(buf)?);
+
+ let n_props = read_array_len(buf)? as usize;
+ let mut props: bumpalo::collections::Vec<(Symbol, Value<'a>)> =
+ bumpalo::collections::Vec::with_capacity_in(n_props, arena.bump());
+ for _ in 0..n_props {
+ let pair_len = read_array_len(buf)?;
+ if pair_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: pair_len,
+ });
+ }
+ let name = intern_str(read_str_borrowed(buf)?);
+ let value = read_value(arena, buf)?;
+ props.push((name, value));
+ }
+
+ let n_children = read_array_len(buf)? as usize;
+ let mut children: bumpalo::collections::Vec<Component<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_children, arena.bump());
+ for _ in 0..n_children {
+ children.push(read_component(arena, buf)?);
+ }
+
+ let n_events = read_array_len(buf)? as usize;
+ let mut events: bumpalo::collections::Vec<EventHandler<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_events, arena.bump());
+ for _ in 0..n_events {
+ events.push(read_event_handler(arena, buf)?);
+ }
+
+ let n_hooks = read_array_len(buf)? as usize;
+ let mut hooks: bumpalo::collections::Vec<Hook<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_hooks, arena.bump());
+ for _ in 0..n_hooks {
+ hooks.push(read_hook(arena, buf)?);
+ }
+
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Element {
+ tag,
+ props: props.into_bump_slice(),
+ children: children.into_bump_slice(),
+ event_handlers: events.into_bump_slice(),
+ hooks: hooks.into_bump_slice(),
+ id,
+ source_loc,
+ })
+ }
+ 1 => {
+ if arr_len != 4 {
+ return Err(ParseError::BadArrayLen {
+ expected: 4,
+ actual: arr_len,
+ });
+ }
+ let value = arena.alloc_str(read_str_borrowed(buf)?);
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Text {
+ value,
+ id,
+ source_loc,
+ })
+ }
+ 2 => {
+ if arr_len != 5 {
+ return Err(ParseError::BadArrayLen {
+ expected: 5,
+ actual: arr_len,
+ });
+ }
+ let iter = read_value(arena, buf)?;
+ let body = arena.alloc(read_component(arena, buf)?);
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Foreach {
+ iter,
+ body: &*body,
+ id,
+ source_loc,
+ })
+ }
+ 3 => {
+ if arr_len != 6 {
+ return Err(ParseError::BadArrayLen {
+ expected: 6,
+ actual: arr_len,
+ });
+ }
+ let test = read_value(arena, buf)?;
+ let then = arena.alloc(read_component(arena, buf)?);
+ let else_ = if try_read_nil(buf)? {
+ None
+ } else {
+ Some(&*arena.alloc(read_component(arena, buf)?))
+ };
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Cond {
+ test,
+ then: &*then,
+ else_,
+ id,
+ source_loc,
+ })
+ }
+ 4 => {
+ if arr_len != 6 {
+ return Err(ParseError::BadArrayLen {
+ expected: 6,
+ actual: arr_len,
+ });
+ }
+ let value = read_value(arena, buf)?;
+ let n_arms = read_array_len(buf)? as usize;
+ let mut arms: bumpalo::collections::Vec<MatchArm<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_arms, arena.bump());
+ for _ in 0..n_arms {
+ arms.push(read_match_arm(arena, buf)?);
+ }
+ let default = if try_read_nil(buf)? {
+ None
+ } else {
+ Some(&*arena.alloc(read_component(arena, buf)?))
+ };
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Match {
+ value,
+ arms: arms.into_bump_slice(),
+ default,
+ id,
+ source_loc,
+ })
+ }
+ 5 => {
+ if arr_len != 5 {
+ return Err(ParseError::BadArrayLen {
+ expected: 5,
+ actual: arr_len,
+ });
+ }
+ let inner = arena.alloc(read_component(arena, buf)?);
+ let key = NodeId(read_u64(buf)?);
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Memoize {
+ inner: &*inner,
+ key,
+ id,
+ source_loc,
+ })
+ }
+ 6 => {
+ if arr_len != 4 {
+ return Err(ParseError::BadArrayLen {
+ expected: 4,
+ actual: arr_len,
+ });
+ }
+ let n_children = read_array_len(buf)? as usize;
+ let mut children: bumpalo::collections::Vec<Component<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_children, arena.bump());
+ for _ in 0..n_children {
+ children.push(read_component(arena, buf)?);
+ }
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Fragment {
+ children: children.into_bump_slice(),
+ id,
+ source_loc,
+ })
+ }
+ 7 => {
+ if arr_len != 4 {
+ return Err(ParseError::BadArrayLen {
+ expected: 4,
+ actual: arr_len,
+ });
+ }
+ let value = read_value(arena, buf)?;
+ let id = NodeId(read_u64(buf)?);
+ let source_loc = read_source_loc(buf)?;
+ Ok(Component::Expr {
+ value,
+ id,
+ source_loc,
+ })
+ }
+ _ => Err(ParseError::UnknownComponentKind(kind)),
+ }
+}
+
+// ---- Public entry points ----------------------------------------------------
+
+/// Parse a `PageIR` msgpack blob into an arena-allocated `Page<'a>`.
+///
+/// Wire format (v2 positional array):
+///
+/// ```text
+/// [v=2, route, root, title|nil, meta, source_files,
+/// component_imports, state_bindings, needs_ref]
+/// ```
+pub fn parse_page<'a>(arena: &'a Arena, bytes: &[u8]) -> Result<Page<'a>> {
+ let mut buf: &[u8] = bytes;
+ let arr_len = read_array_len(&mut buf)?;
+ if arr_len != 9 {
+ return Err(ParseError::BadArrayLen {
+ expected: 9,
+ actual: arr_len,
+ });
+ }
+ let version = read_u32(&mut buf)?;
+ if version != SCHEMA_VERSION {
+ return Err(ParseError::UnsupportedVersion(version));
+ }
+ let route = arena.alloc_str(read_str_borrowed(&mut buf)?);
+ let root = arena.alloc(read_component(arena, &mut buf)?);
+ let title = match read_str_or_nil_borrowed(&mut buf)? {
+ None => None,
+ Some(s) => Some(&*arena.alloc_str(s)),
+ };
+
+ let n_meta = read_array_len(&mut buf)? as usize;
+ let mut meta: bumpalo::collections::Vec<Meta<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_meta, arena.bump());
+ for _ in 0..n_meta {
+ meta.push(read_meta(arena, &mut buf)?);
+ }
+
+ let n_files = read_array_len(&mut buf)? as usize;
+ let mut files: bumpalo::collections::Vec<PyFileId> =
+ bumpalo::collections::Vec::with_capacity_in(n_files, arena.bump());
+ for _ in 0..n_files {
+ files.push(PyFileId(read_u32(&mut buf)?));
+ }
+
+ let component_imports = read_symbol_pair_array(arena, &mut buf)?;
+ let state_bindings = read_symbol_array(arena, &mut buf)?;
+ let needs_ref = read_bool(&mut buf)?;
+
+ Ok(Page {
+ schema_version: version,
+ route,
+ root: &*root,
+ title,
+ meta: meta.into_bump_slice(),
+ source_files: files.into_bump_slice(),
+ component_imports,
+ state_bindings,
+ needs_ref,
+ })
+}
+
+// ---- Theme / GlobalState / PluginManifest parsers ---------------------------
+
+pub fn parse_theme<'a>(arena: &'a Arena, bytes: &[u8]) -> Result<Theme<'a>> {
+ let mut buf: &[u8] = bytes;
+ let arr_len = read_array_len(&mut buf)?;
+ if arr_len != 4 {
+ return Err(ParseError::BadArrayLen {
+ expected: 4,
+ actual: arr_len,
+ });
+ }
+ let version = read_u32(&mut buf)?;
+ if version != SCHEMA_VERSION {
+ return Err(ParseError::UnsupportedVersion(version));
+ }
+ let n_tokens = read_array_len(&mut buf)? as usize;
+ let mut tokens: bumpalo::collections::Vec<(Symbol, &'a str)> =
+ bumpalo::collections::Vec::with_capacity_in(n_tokens, arena.bump());
+ for _ in 0..n_tokens {
+ let pair_len = read_array_len(&mut buf)?;
+ if pair_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: pair_len,
+ });
+ }
+ let name = intern_str(read_str_borrowed(&mut buf)?);
+ let value = arena.alloc_str(read_str_borrowed(&mut buf)?);
+ tokens.push((name, value));
+ }
+ let global_style = arena.alloc_str(read_str_borrowed(&mut buf)?);
+ let appearance = arena.alloc_str(read_str_borrowed(&mut buf)?);
+ Ok(Theme {
+ schema_version: version,
+ tokens: tokens.into_bump_slice(),
+ global_style,
+ appearance,
+ })
+}
+
+pub fn parse_global_state<'a>(arena: &'a Arena, bytes: &[u8]) -> Result<GlobalState<'a>> {
+ let mut buf: &[u8] = bytes;
+ let arr_len = read_array_len(&mut buf)?;
+ if arr_len != 4 {
+ return Err(ParseError::BadArrayLen {
+ expected: 4,
+ actual: arr_len,
+ });
+ }
+ let version = read_u32(&mut buf)?;
+ if version != SCHEMA_VERSION {
+ return Err(ParseError::UnsupportedVersion(version));
+ }
+ let initial_state_json = arena.alloc_slice_copy(read_bin_borrowed(&mut buf)?);
+ let client_storage_json = arena.alloc_slice_copy(read_bin_borrowed(&mut buf)?);
+ let n_deps = read_array_len(&mut buf)? as usize;
+ let mut deps: bumpalo::collections::Vec<ComputedVarDep<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_deps, arena.bump());
+ for _ in 0..n_deps {
+ let pair_len = read_array_len(&mut buf)?;
+ if pair_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: pair_len,
+ });
+ }
+ let var = intern_str(read_str_borrowed(&mut buf)?);
+ let depends_on = read_symbol_array(arena, &mut buf)?;
+ deps.push(ComputedVarDep { var, depends_on });
+ }
+ Ok(GlobalState {
+ schema_version: version,
+ initial_state_json: &*initial_state_json,
+ client_storage_json: &*client_storage_json,
+ computed_var_deps: deps.into_bump_slice(),
+ })
+}
+
+pub fn parse_plugin_manifest<'a>(arena: &'a Arena, bytes: &[u8]) -> Result<PluginManifest<'a>> {
+ let mut buf: &[u8] = bytes;
+ let arr_len = read_array_len(&mut buf)?;
+ if arr_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: arr_len,
+ });
+ }
+ let version = read_u32(&mut buf)?;
+ if version != SCHEMA_VERSION {
+ return Err(ParseError::UnsupportedVersion(version));
+ }
+ let n_plugins = read_array_len(&mut buf)? as usize;
+ let mut plugins: bumpalo::collections::Vec<PluginEntry<'a>> =
+ bumpalo::collections::Vec::with_capacity_in(n_plugins, arena.bump());
+ for _ in 0..n_plugins {
+ let plug_len = read_array_len(&mut buf)?;
+ if plug_len != 3 {
+ return Err(ParseError::BadArrayLen {
+ expected: 3,
+ actual: plug_len,
+ });
+ }
+ let name = intern_str(read_str_borrowed(&mut buf)?);
+ let n_assets = read_array_len(&mut buf)? as usize;
+ let mut assets: bumpalo::collections::Vec<(Symbol, &'a [u8])> =
+ bumpalo::collections::Vec::with_capacity_in(n_assets, arena.bump());
+ for _ in 0..n_assets {
+ let asset_len = read_array_len(&mut buf)?;
+ if asset_len != 2 {
+ return Err(ParseError::BadArrayLen {
+ expected: 2,
+ actual: asset_len,
+ });
+ }
+ let path = intern_str(read_str_borrowed(&mut buf)?);
+ let body = arena.alloc_slice_copy(read_bin_borrowed(&mut buf)?);
+ assets.push((path, &*body));
+ }
+ let stylesheet_imports = read_symbol_array(arena, &mut buf)?;
+ plugins.push(PluginEntry {
+ name,
+ static_assets: assets.into_bump_slice(),
+ stylesheet_imports,
+ });
+ }
+ Ok(PluginManifest {
+ schema_version: version,
+ plugins: plugins.into_bump_slice(),
+ })
+}
+
+// ---- Helpers for tests ------------------------------------------------------
+
+#[doc(hidden)]
+pub mod test_helpers {
+ /// Build a minimal Page msgpack blob (v2): a single Element with one
+ /// prop, one Text child, no component imports, no state bindings.
+ pub fn tiny_page_bytes() -> Vec<u8> {
+ use rmp::encode::*;
+ let mut out = Vec::new();
+ // PageIR v2 = [v, route, root, title|nil, meta, source_files,
+ // component_imports, state_bindings, needs_ref]
+ write_array_len(&mut out, 9).unwrap();
+ write_u32(&mut out, 2).unwrap();
+ write_str(&mut out, "/index").unwrap();
+ // Root: Element(0) = [0, tag, props, children, events, hooks, id, loc]
+ write_array_len(&mut out, 8).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ write_str(&mut out, "div").unwrap();
+ // props: one prop ("id", JsExpr "x")
+ write_array_len(&mut out, 1).unwrap();
+ write_array_len(&mut out, 2).unwrap();
+ write_str(&mut out, "id").unwrap();
+ // Value JsExpr(0) = [0, expr, var_data]
+ write_array_len(&mut out, 3).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ write_str(&mut out, "x").unwrap();
+ // VarData empty
+ write_array_len(&mut out, 6).unwrap();
+ write_array_len(&mut out, 0).unwrap(); // hooks
+ write_array_len(&mut out, 0).unwrap(); // imports
+ write_nil(&mut out).unwrap(); // state
+ write_array_len(&mut out, 0).unwrap(); // deps
+ write_nil(&mut out).unwrap(); // position
+ write_array_len(&mut out, 0).unwrap(); // components
+ // children: one Text
+ write_array_len(&mut out, 1).unwrap();
+ write_array_len(&mut out, 4).unwrap();
+ write_uint(&mut out, 1).unwrap(); // kind=Text
+ write_str(&mut out, "hello").unwrap();
+ write_uint(&mut out, 42).unwrap(); // id
+ write_array_len(&mut out, 3).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ // events: empty
+ write_array_len(&mut out, 0).unwrap();
+ // hooks: empty
+ write_array_len(&mut out, 0).unwrap();
+ // id
+ write_uint(&mut out, 7).unwrap();
+ // loc
+ write_array_len(&mut out, 3).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ write_uint(&mut out, 0).unwrap();
+ // title: nil
+ write_nil(&mut out).unwrap();
+ // meta: empty
+ write_array_len(&mut out, 0).unwrap();
+ // source_files: empty
+ write_array_len(&mut out, 0).unwrap();
+ // component_imports: empty
+ write_array_len(&mut out, 0).unwrap();
+ // state_bindings: empty
+ write_array_len(&mut out, 0).unwrap();
+ // needs_ref: false
+ write_bool(&mut out, false).unwrap();
+ out
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::IrVisitor;
+
+ #[test]
+ fn parses_tiny_page() {
+ let arena = Arena::new();
+ let bytes = test_helpers::tiny_page_bytes();
+ let page = parse_page(&arena, &bytes).expect("parse ok");
+ assert_eq!(page.schema_version, SCHEMA_VERSION);
+ assert_eq!(page.route, "/index");
+ match page.root {
+ Component::Element { tag, children, .. } => {
+ assert_eq!(reflex_intern::resolve(*tag).unwrap(), "div");
+ assert_eq!(children.len(), 1);
+ match &children[0] {
+ Component::Text { value, id, .. } => {
+ assert_eq!(*value, "hello");
+ assert_eq!(id.0, 42);
+ }
+ _ => panic!("expected Text"),
+ }
+ }
+ _ => panic!("expected Element"),
+ }
+ }
+
+ #[test]
+ fn rejects_wrong_version() {
+ use rmp::encode::*;
+ let arena = Arena::new();
+ let mut bytes = Vec::new();
+ write_array_len(&mut bytes, 9).unwrap();
+ write_u32(&mut bytes, 9999).unwrap();
+ let err = parse_page(&arena, &bytes).unwrap_err();
+ assert!(matches!(err, ParseError::UnsupportedVersion(9999)));
+ }
+
+ #[test]
+ fn visitor_walks_parsed_tree() {
+ struct Counter(usize);
+ impl<'a> IrVisitor<'a> for Counter {
+ fn visit_component(&mut self, c: &Component<'a>) {
+ self.0 += 1;
+ crate::walk_component(self, c);
+ }
+ }
+ let arena = Arena::new();
+ let bytes = test_helpers::tiny_page_bytes();
+ let page = parse_page(&arena, &bytes).unwrap();
+ let mut c = Counter(0);
+ c.visit_component(page.root);
+ assert_eq!(c.0, 2);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_ir/src/visitor.rs b/packages/reflex-compiler-rust/crates/reflex_ir/src/visitor.rs
new file mode 100644
index 00000000000..27163b98d3c
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_ir/src/visitor.rs
@@ -0,0 +1,178 @@
+//! Monomorphic IR visitor. See plan §3 / D6, R3.
+//!
+//! Every `visit_*` method has a default that calls the corresponding free
+//! `walk_*` function. Visitors override only the nodes they care about. The
+//! traversal is generic (no `&dyn Trait`) so each visitor monomorphizes its
+//! own copy of the walk functions — match arms inline and the compiler can
+//! kill the dead branches.
+
+use crate::{Component, EventHandler, Hook, MatchArm, Meta, Page, Value, VarData};
+
+pub trait IrVisitor<'a> {
+ #[inline]
+ fn visit_page(&mut self, page: &Page<'a>) {
+ walk_page(self, page);
+ }
+
+ #[inline]
+ fn visit_component(&mut self, component: &Component<'a>) {
+ walk_component(self, component);
+ }
+
+ #[inline]
+ fn visit_value(&mut self, value: &Value<'a>) {
+ walk_value(self, value);
+ }
+
+ #[inline]
+ fn visit_var_data(&mut self, _var_data: &VarData<'a>) {}
+
+ #[inline]
+ fn visit_event_handler(&mut self, handler: &EventHandler<'a>) {
+ walk_event_handler(self, handler);
+ }
+
+ #[inline]
+ fn visit_hook(&mut self, _hook: &Hook<'a>) {}
+
+ #[inline]
+ fn visit_match_arm(&mut self, arm: &MatchArm<'a>) {
+ walk_match_arm(self, arm);
+ }
+
+ #[inline]
+ fn visit_meta(&mut self, _meta: &Meta<'a>) {}
+}
+
+#[inline]
+pub fn walk_page<'a, V: IrVisitor<'a> + ?Sized>(v: &mut V, page: &Page<'a>) {
+ for meta in page.meta {
+ v.visit_meta(meta);
+ }
+ v.visit_component(page.root);
+}
+
+#[inline]
+pub fn walk_component<'a, V: IrVisitor<'a> + ?Sized>(v: &mut V, component: &Component<'a>) {
+ match component {
+ Component::Element {
+ props,
+ children,
+ event_handlers,
+ hooks,
+ ..
+ } => {
+ for (_, value) in *props {
+ v.visit_value(value);
+ }
+ for child in *children {
+ v.visit_component(child);
+ }
+ for handler in *event_handlers {
+ v.visit_event_handler(handler);
+ }
+ for hook in *hooks {
+ v.visit_hook(hook);
+ }
+ }
+ Component::Text { .. } => {}
+ Component::Foreach { iter, body, .. } => {
+ v.visit_value(iter);
+ v.visit_component(body);
+ }
+ Component::Cond {
+ test, then, else_, ..
+ } => {
+ v.visit_value(test);
+ v.visit_component(then);
+ if let Some(e) = else_ {
+ v.visit_component(e);
+ }
+ }
+ Component::Match {
+ value,
+ arms,
+ default,
+ ..
+ } => {
+ v.visit_value(value);
+ for arm in *arms {
+ v.visit_match_arm(arm);
+ }
+ if let Some(d) = default {
+ v.visit_component(d);
+ }
+ }
+ Component::Memoize { inner, .. } => {
+ v.visit_component(inner);
+ }
+ Component::Fragment { children, .. } => {
+ for child in *children {
+ v.visit_component(child);
+ }
+ }
+ Component::Expr { value, .. } => {
+ v.visit_value(value);
+ }
+ }
+}
+
+#[inline]
+pub fn walk_value<'a, V: IrVisitor<'a> + ?Sized>(v: &mut V, value: &Value<'a>) {
+ if let Value::JsExpr { var_data, .. } = value {
+ v.visit_var_data(var_data);
+ }
+}
+
+#[inline]
+pub fn walk_event_handler<'a, V: IrVisitor<'a> + ?Sized>(v: &mut V, handler: &EventHandler<'a>) {
+ v.visit_var_data(&handler.var_data);
+}
+
+#[inline]
+pub fn walk_match_arm<'a, V: IrVisitor<'a> + ?Sized>(v: &mut V, arm: &MatchArm<'a>) {
+ v.visit_value(&arm.case);
+ v.visit_component(arm.body);
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::{NodeId, SourceLoc};
+
+ struct Counter {
+ components: usize,
+ values: usize,
+ }
+
+ impl<'a> IrVisitor<'a> for Counter {
+ fn visit_component(&mut self, c: &Component<'a>) {
+ self.components += 1;
+ walk_component(self, c);
+ }
+
+ fn visit_value(&mut self, v: &Value<'a>) {
+ self.values += 1;
+ walk_value(self, v);
+ }
+ }
+
+ #[test]
+ fn counts_nested_components() {
+ let loc = SourceLoc::SYNTHETIC;
+ let inner_text = Component::Text {
+ value: "hi",
+ id: NodeId(1),
+ source_loc: loc,
+ };
+ let root = Component::Fragment {
+ children: std::slice::from_ref(&inner_text),
+ id: NodeId(2),
+ source_loc: loc,
+ };
+ let mut c = Counter { components: 0, values: 0 };
+ c.visit_component(&root);
+ assert_eq!(c.components, 2);
+ assert_eq!(c.values, 0);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_py/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_py/Cargo.toml
new file mode 100644
index 00000000000..47603e2edc5
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_py/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "reflex_py"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[lib]
+name = "_native"
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = { workspace = true }
+rmp = { workspace = true }
+rmp-serde = { workspace = true }
+serde = { workspace = true }
+bumpalo = { workspace = true }
+thiserror = { workspace = true }
+reflex_ir = { workspace = true }
+reflex_codegen = { workspace = true }
+reflex_arena = { workspace = true }
+reflex_intern = { workspace = true }
+reflex_db = { workspace = true }
+reflex_pyread = { workspace = true }
diff --git a/packages/reflex-compiler-rust/crates/reflex_py/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_py/src/lib.rs
new file mode 100644
index 00000000000..a9fd6220068
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_py/src/lib.rs
@@ -0,0 +1,357 @@
+//! PyO3 entry for the reflex-compiler-rust wheel.
+//!
+//! Two surfaces live here:
+//!
+//! 1. The spike microbenchmark probes (`empty_call`, `walk_*`) — preserved
+//! because `scripts/spike_bench.py` and `SPIKE_RESULTS.md` reference them.
+//! Spike wire format: positional msgpack arrays, simple shape documented
+//! inline below.
+//!
+//! 2. `CompilerSession` — the real entry point. Takes a §4 PageIR msgpack
+//! blob, runs the parse → JSX-emit pipeline, returns a JS source string.
+//! Salsa caching lands in D5 — for now every call rebuilds.
+
+mod session;
+
+use std::io::Cursor;
+
+use bumpalo::Bump;
+use pyo3::prelude::*;
+use pyo3::types::PyBytes;
+use rmp::decode::{self, RmpRead};
+use serde::Deserialize;
+
+// ---- 1. Pure crossing probes -------------------------------------------------
+
+#[pyfunction]
+fn empty_call() {}
+
+#[pyfunction]
+fn add_one(x: i64) -> i64 {
+ x + 1
+}
+
+#[pyfunction]
+fn bytes_passthrough(b: &Bound<'_, PyBytes>) -> usize {
+ b.as_bytes().len()
+}
+
+// ---- 2. rmp-serde path -------------------------------------------------------
+
+#[derive(Deserialize)]
+#[serde(untagged)]
+enum SerdeNode {
+ Element(u8, String, Vec<(String, String)>, Vec<SerdeNode>),
+ Text(u8, String),
+}
+
+fn serde_walk(n: &SerdeNode, nodes: &mut u64, bytes: &mut u64) {
+ match n {
+ SerdeNode::Element(_, tag, props, children) => {
+ *nodes += 1;
+ *bytes += tag.len() as u64;
+ for (k, v) in props {
+ *bytes += (k.len() + v.len()) as u64;
+ }
+ for c in children {
+ serde_walk(c, nodes, bytes);
+ }
+ }
+ SerdeNode::Text(_, s) => {
+ *nodes += 1;
+ *bytes += s.len() as u64;
+ }
+ }
+}
+
+#[pyfunction]
+fn walk_serde(b: &Bound<'_, PyBytes>) -> PyResult<(u64, u64)> {
+ let bytes = b.as_bytes();
+ let root: SerdeNode = rmp_serde::from_slice(bytes)
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(format!("rmp-serde: {e}")))?;
+ let mut n = 0u64;
+ let mut s = 0u64;
+ serde_walk(&root, &mut n, &mut s);
+ Ok((n, s))
+}
+
+// ---- 3. Hand-rolled msgpack reader, zero-copy borrows -----------------------
+//
+// rmp::decode lets us read length-prefixed scalars and use the remaining cursor
+// to take string bytes as &[u8] without copying. We then `str::from_utf8` (which
+// is a check, not a copy). No heap allocations on the parse side at all.
+//
+// Walking happens inline with parsing — we never materialize the tree. That's
+// exactly what real Rust codegen would do; this is the realistic lower bound.
+
+fn manual_read_str<'a>(buf: &mut &'a [u8]) -> std::io::Result<&'a str> {
+ let len = decode::read_str_len(buf).map_err(|e| std::io::Error::other(e.to_string()))? as usize;
+ if buf.len() < len {
+ return Err(std::io::Error::other("short read"));
+ }
+ let (s, rest) = buf.split_at(len);
+ *buf = rest;
+ std::str::from_utf8(s).map_err(|e| std::io::Error::other(e.to_string()))
+}
+
+fn manual_walk<'a>(buf: &mut &'a [u8], nodes: &mut u64, bytes: &mut u64) -> std::io::Result<()> {
+ let arr_len = decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ let kind = buf.read_u8()?;
+ *nodes += 1;
+ if kind == 0 {
+ // [0, tag, props, children] -> arr_len == 4
+ debug_assert_eq!(arr_len, 4);
+ let tag = manual_read_str(buf)?;
+ *bytes += tag.len() as u64;
+ let n_props =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ for _ in 0..n_props {
+ let pair_len =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ debug_assert_eq!(pair_len, 2);
+ let k = manual_read_str(buf)?;
+ let v = manual_read_str(buf)?;
+ *bytes += (k.len() + v.len()) as u64;
+ }
+ let n_children =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ for _ in 0..n_children {
+ manual_walk(buf, nodes, bytes)?;
+ }
+ } else {
+ // [1, value]
+ debug_assert_eq!(arr_len, 2);
+ let v = manual_read_str(buf)?;
+ *bytes += v.len() as u64;
+ }
+ Ok(())
+}
+
+#[pyfunction]
+fn walk_manual(b: &Bound<'_, PyBytes>) -> PyResult<(u64, u64)> {
+ let mut cur: &[u8] = b.as_bytes();
+ let mut n = 0u64;
+ let mut s = 0u64;
+ manual_walk(&mut cur, &mut n, &mut s)
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(format!("manual walk: {e}")))?;
+ Ok((n, s))
+}
+
+// ---- 4. Hand-rolled walk + JSX-like emit into a buffer ----------------------
+//
+// This is what a real Rust codegen pass would do: parse and emit in a single
+// streaming pass, writing into one growable byte buffer. No arena needed for
+// this shape because the output buffer IS the only allocation.
+
+fn emit_str(out: &mut Vec<u8>, s: &str) {
+ out.push(b'"');
+ out.extend_from_slice(s.as_bytes());
+ out.push(b'"');
+}
+
+fn manual_walk_emit<'a>(buf: &mut &'a [u8], out: &mut Vec<u8>) -> std::io::Result<()> {
+ let _ = decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ let kind = buf.read_u8()?;
+ if kind == 0 {
+ let tag = manual_read_str(buf)?;
+ out.extend_from_slice(b"jsx(");
+ out.extend_from_slice(tag.as_bytes());
+ out.extend_from_slice(b",{");
+ let n_props =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ for i in 0..n_props {
+ if i > 0 {
+ out.push(b',');
+ }
+ let _ =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ let k = manual_read_str(buf)?;
+ let v = manual_read_str(buf)?;
+ out.extend_from_slice(k.as_bytes());
+ out.push(b':');
+ out.extend_from_slice(v.as_bytes());
+ }
+ out.push(b'}');
+ let n_children =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ for _ in 0..n_children {
+ out.push(b',');
+ manual_walk_emit(buf, out)?;
+ }
+ out.push(b')');
+ } else {
+ let v = manual_read_str(buf)?;
+ emit_str(out, v);
+ }
+ Ok(())
+}
+
+#[pyfunction]
+fn walk_manual_emit<'py>(py: Python<'py>, b: &Bound<'py, PyBytes>) -> PyResult<Bound<'py, PyBytes>> {
+ let input = b.as_bytes().to_vec(); // copy out before releasing GIL
+ let out = py
+ .allow_threads(|| -> std::io::Result<Vec<u8>> {
+ let mut cur: &[u8] = &input;
+ let mut out = Vec::with_capacity(input.len() * 2);
+ manual_walk_emit(&mut cur, &mut out)?;
+ Ok(out)
+ })
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(format!("emit: {e}")))?;
+ Ok(PyBytes::new_bound(py, &out))
+}
+
+// ---- 5. Bumpalo arena demo --------------------------------------------------
+//
+// Parse the tree into a bumpalo-backed AST (Copy nodes, &str borrows into a
+// owned String copy in the arena), then walk it. Tests R1/R2: arena holds the
+// tree; nothing leaks; drop is a single bump reset.
+
+#[derive(Clone, Copy)]
+enum ArenaNode<'a> {
+ Element {
+ tag: &'a str,
+ props: &'a [(&'a str, &'a str)],
+ children: &'a [ArenaNode<'a>],
+ },
+ Text(&'a str),
+}
+
+fn parse_arena<'a, 'b>(buf: &mut &'b [u8], arena: &'a Bump) -> std::io::Result<ArenaNode<'a>>
+where
+ 'b: 'a,
+{
+ let _ = decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ let kind = buf.read_u8()?;
+ if kind == 0 {
+ let tag = arena.alloc_str(manual_read_str(buf)?);
+ let n_props =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))? as usize;
+ let mut props = bumpalo::collections::Vec::with_capacity_in(n_props, arena);
+ for _ in 0..n_props {
+ let _ =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))?;
+ let k = arena.alloc_str(manual_read_str(buf)?);
+ let v = arena.alloc_str(manual_read_str(buf)?);
+ props.push((&*k, &*v));
+ }
+ let n_children =
+ decode::read_array_len(buf).map_err(|e| std::io::Error::other(e.to_string()))? as usize;
+ let mut children = bumpalo::collections::Vec::with_capacity_in(n_children, arena);
+ for _ in 0..n_children {
+ children.push(parse_arena(buf, arena)?);
+ }
+ Ok(ArenaNode::Element {
+ tag,
+ props: props.into_bump_slice(),
+ children: children.into_bump_slice(),
+ })
+ } else {
+ Ok(ArenaNode::Text(arena.alloc_str(manual_read_str(buf)?)))
+ }
+}
+
+fn arena_emit(node: &ArenaNode<'_>, out: &mut Vec<u8>) {
+ match node {
+ ArenaNode::Element { tag, props, children } => {
+ out.extend_from_slice(b"jsx(");
+ out.extend_from_slice(tag.as_bytes());
+ out.extend_from_slice(b",{");
+ for (i, (k, v)) in props.iter().enumerate() {
+ if i > 0 {
+ out.push(b',');
+ }
+ out.extend_from_slice(k.as_bytes());
+ out.push(b':');
+ out.extend_from_slice(v.as_bytes());
+ }
+ out.push(b'}');
+ for c in *children {
+ out.push(b',');
+ arena_emit(c, out);
+ }
+ out.push(b')');
+ }
+ ArenaNode::Text(s) => emit_str(out, s),
+ }
+}
+
+#[pyfunction]
+fn walk_arena_emit<'py>(py: Python<'py>, b: &Bound<'py, PyBytes>) -> PyResult<Bound<'py, PyBytes>> {
+ let input = b.as_bytes().to_vec();
+ let out = py
+ .allow_threads(|| -> std::io::Result<Vec<u8>> {
+ let arena = Bump::with_capacity(input.len() * 2);
+ let mut cur: &[u8] = &input;
+ let root = parse_arena(&mut cur, &arena)?;
+ let mut out = Vec::with_capacity(input.len() * 2);
+ arena_emit(&root, &mut out);
+ Ok(out)
+ })
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(format!("arena emit: {e}")))?;
+ Ok(PyBytes::new_bound(py, &out))
+}
+
+// ---- 6. rmp-serde + emit (for apples-to-apples vs hand-rolled) --------------
+
+fn serde_emit(n: &SerdeNode, out: &mut Vec<u8>) {
+ match n {
+ SerdeNode::Element(_, tag, props, children) => {
+ out.extend_from_slice(b"jsx(");
+ out.extend_from_slice(tag.as_bytes());
+ out.extend_from_slice(b",{");
+ for (i, (k, v)) in props.iter().enumerate() {
+ if i > 0 {
+ out.push(b',');
+ }
+ out.extend_from_slice(k.as_bytes());
+ out.push(b':');
+ out.extend_from_slice(v.as_bytes());
+ }
+ out.push(b'}');
+ for c in children {
+ out.push(b',');
+ serde_emit(c, out);
+ }
+ out.push(b')');
+ }
+ SerdeNode::Text(_, s) => emit_str(out, s),
+ }
+}
+
+#[pyfunction]
+fn walk_serde_emit<'py>(py: Python<'py>, b: &Bound<'py, PyBytes>) -> PyResult<Bound<'py, PyBytes>> {
+ let input = b.as_bytes().to_vec();
+ let out = py
+ .allow_threads(|| -> PyResult<Vec<u8>> {
+ let mut de = rmp_serde::Deserializer::new(Cursor::new(&input));
+ let root: SerdeNode = SerdeNode::deserialize(&mut de)
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(format!("rmp-serde: {e}")))?;
+ let mut out = Vec::with_capacity(input.len() * 2);
+ serde_emit(&root, &mut out);
+ Ok(out)
+ })?;
+ Ok(PyBytes::new_bound(py, &out))
+}
+
+// ---- Module export ----------------------------------------------------------
+
+#[pymodule]
+fn _native(_py: Python, m: &Bound<'_, PyModule>) -> PyResult<()> {
+ // Spike probes.
+ m.add_function(wrap_pyfunction!(empty_call, m)?)?;
+ m.add_function(wrap_pyfunction!(add_one, m)?)?;
+ m.add_function(wrap_pyfunction!(bytes_passthrough, m)?)?;
+ m.add_function(wrap_pyfunction!(walk_serde, m)?)?;
+ m.add_function(wrap_pyfunction!(walk_manual, m)?)?;
+ m.add_function(wrap_pyfunction!(walk_manual_emit, m)?)?;
+ m.add_function(wrap_pyfunction!(walk_arena_emit, m)?)?;
+ m.add_function(wrap_pyfunction!(walk_serde_emit, m)?)?;
+
+ // Schema version sanity (parsers agree with the wire format).
+ m.add("SCHEMA_VERSION", reflex_ir::parse::SCHEMA_VERSION)?;
+
+ // The real compiler session.
+ m.add_class::<session::CompilerSession>()?;
+ m.add_class::<session::CompiledOutput>()?;
+ Ok(())
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_py/src/session.rs b/packages/reflex-compiler-rust/crates/reflex_py/src/session.rs
new file mode 100644
index 00000000000..7110169f2a6
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_py/src/session.rs
@@ -0,0 +1,687 @@
+//! `CompilerSession` — the real PyO3 entry point. See plan §3.4, D4.
+//!
+//! The Python side keeps a long-lived `CompilerSession` instance across
+//! reloads. Each `compile_app(...)` call ships per-page msgpack blobs plus
+//! the theme/global-state/plugin-manifest blobs; Rust parses, emits, and
+//! returns a `CompiledOutput` carrying `{path: bytes}` for the Python side
+//! to write.
+//!
+//! Salsa caching lands in D5. Until then every call rebuilds — the
+//! `content_hash` ferried over the wire is recorded but unused.
+
+use std::collections::HashMap;
+
+use pyo3::prelude::*;
+use pyo3::types::{PyBytes, PyDict, PyList, PyTuple};
+
+use reflex_arena::Arena;
+use reflex_codegen::{
+ emit_app_root, emit_app_root_module, emit_context, emit_context_module,
+ emit_document_root_module, emit_memo_index, emit_memo_module, emit_page,
+ emit_page_with_extras, emit_page_with_map, emit_stateful_pages_json, emit_styles_root,
+ emit_theme, emit_theme_module, emit_vite_config, CodeBuffer, SourceMap,
+};
+use reflex_db::CompilerDb;
+use reflex_ir::{parse_global_state, parse_page, parse_plugin_manifest, parse_theme};
+use reflex_pyread::{
+ collect_all_imports as pyread_collect_all_imports,
+ collect_all_imports_into as pyread_collect_all_imports_into,
+ merge_imports_into as pyread_merge_imports_into, read_page,
+ should_memoize as memoize_should_memoize, MemoRefs, PyRefs,
+};
+
+/// One per Python `reflex.compiler.session.CompilerSession`. Holds the
+/// content-hash-keyed compile cache (D5) so hot-reload is incremental.
+#[pyclass]
+pub struct CompilerSession {
+ db: CompilerDb,
+}
+
+#[pymethods]
+impl CompilerSession {
+ #[new]
+ fn new() -> Self {
+ Self {
+ db: CompilerDb::new(),
+ }
+ }
+
+ /// Cap the page cache. Pass `None` for unbounded.
+ fn set_cache_capacity(&self, cap: Option<usize>) {
+ self.db.set_cache_capacity(cap);
+ }
+
+ /// Drop all cached page renders. Equivalent to creating a new session.
+ fn clear_cache(&self) {
+ self.db.clear();
+ }
+
+ /// Number of cached page renders. Useful for tests + diagnostics.
+ fn cache_len(&self) -> usize {
+ self.db.cache_len()
+ }
+
+ /// Compile a single page's IR bytes to a JS source string. The Python side
+ /// passes `(route_ident, page_ir_bytes)`; we return the rendered module
+ /// source.
+ ///
+ /// This is the single-page fast path used by hot-reload. `compile_app`
+ /// below batches over many pages and produces auxiliary artifacts.
+ fn compile_page(
+ &self,
+ py: Python<'_>,
+ route_ident: &str,
+ page_bytes: &Bound<'_, PyBytes>,
+ ) -> PyResult<String> {
+ let bytes = page_bytes.as_bytes().to_vec();
+ let route_ident = route_ident.to_owned();
+ let db = self.db.clone();
+ py.allow_threads(move || {
+ db.emit_page(&route_ident, &bytes)
+ .map(|s| s.as_ref().to_owned())
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(e.to_string()))
+ })
+ }
+
+ /// Compile one page and also return its source map. The cache is bypassed
+ /// (it stores only the rendered string, not the map). Use when you need
+ /// diagnostic back-mapping; use `compile_page` for hot-reload.
+ ///
+ /// Returns `(rendered_js, [(offset, file_id, line, col), ...])`.
+ fn compile_page_with_sourcemap(
+ &self,
+ py: Python<'_>,
+ route_ident: &str,
+ page_bytes: &Bound<'_, PyBytes>,
+ ) -> PyResult<(String, Vec<(u32, u32, u32, u32)>)> {
+ let bytes = page_bytes.as_bytes().to_vec();
+ let route_ident = route_ident.to_owned();
+ py.allow_threads(move || compile_page_with_sourcemap_inner(&route_ident, &bytes))
+ }
+
+ /// Compile a memo wrapper module from a Component PyObject.
+ ///
+ /// Mirrors `templates.memo_single_component_template` (plan §0b
+ /// lever (b3)). The Component should already have its `{children}`
+ /// hole substituted at the Python level (passthrough wrappers carry
+ /// a single `Bare(Var(_js_expr="children"))` child; snapshot bodies
+ /// own their full subtree). Pyread walks the tree; `emit_memo_module`
+ /// emits the `export const <name> = memo(...)` shell.
+ ///
+ /// Args:
+ /// name: exported memo identifier.
+ /// signature: parameter list spliced after `memo(`. Typical
+ /// values are `"{ children }"` for passthroughs and `"()"`
+ /// for snapshot bodies.
+ /// component: the wrapper-component PyObject (already
+ /// hole-substituted).
+ #[pyo3(signature = (name, signature, component, route="/__memo__", pre_hooks=""))]
+ fn compile_memo_from_component<'py>(
+ &self,
+ py: Python<'py>,
+ name: &str,
+ signature: &str,
+ component: &Bound<'py, PyAny>,
+ route: &str,
+ pre_hooks: &str,
+ ) -> PyResult<String> {
+ let refs = PyRefs::new(py)?;
+ let arena = Arena::new();
+ let page = read_page(py, component, route, None, &[], &arena, &refs)?;
+ let mut buf = CodeBuffer::with_capacity(1024);
+ emit_memo_module(&mut buf, &page, name, signature, pre_hooks);
+ String::from_utf8(buf.into_bytes()).map_err(|e| {
+ pyo3::exceptions::PyValueError::new_err(format!(
+ "rust memo emit produced non-utf8: {e}"
+ ))
+ })
+ }
+
+ /// Emit the memo index module to `out_path`.
+ ///
+ /// Streams the rendered bytes straight to disk via a
+ /// `BufWriter<File>` — no intermediate `String` allocation. Mirrors
+ /// `memo_index_template` in
+ /// `packages/reflex-base/src/reflex_base/compiler/templates.py`.
+ ///
+ /// Args:
+ /// reexports: list of `(export_name, relative_module_specifier)`
+ /// tuples.
+ /// out_path: absolute filesystem path the index gets written to.
+ /// Parent directory must already exist.
+ fn compile_memo_index(
+ &self,
+ reexports: Vec<(String, String)>,
+ out_path: &str,
+ ) -> PyResult<()> {
+ let pairs: Vec<(&str, &str)> = reexports
+ .iter()
+ .map(|(n, s)| (n.as_str(), s.as_str()))
+ .collect();
+ write_to_file(out_path, |w| emit_memo_index(&pairs, w))
+ }
+
+ /// Emit `.web/styles/styles.css`.
+ ///
+ /// Ports `styles_template` — wraps every stylesheet in an
+ /// `@import url('…');` line under a single
+ /// `@layer __reflex_base;` header.
+ fn compile_styles_root(
+ &self,
+ stylesheets: Vec<String>,
+ out_path: &str,
+ ) -> PyResult<()> {
+ let refs: Vec<&str> = stylesheets.iter().map(String::as_str).collect();
+ write_to_file(out_path, |w| emit_styles_root(&refs, w))
+ }
+
+ /// Emit `.web/utils/theme.js`.
+ ///
+ /// Ports `theme_template` — a single
+ /// `export default <theme_js>` line where `theme_js` is the JS
+ /// object literal Python builds via `LiteralVar.create(theme)`.
+ fn compile_theme_module(&self, theme_js: &str, out_path: &str) -> PyResult<()> {
+ write_to_file(out_path, |w| emit_theme_module(theme_js, w))
+ }
+
+ /// Emit `.web/backend/stateful_pages.json`.
+ ///
+ /// Mirrors `App._write_stateful_pages_marker`. Python decides which
+ /// routes are stateful (it requires a state walk we haven't ported);
+ /// Rust just serializes the list as JSON and writes the file.
+ fn compile_stateful_pages_marker(
+ &self,
+ routes: Vec<String>,
+ out_path: &str,
+ ) -> PyResult<()> {
+ let refs: Vec<&str> = routes.iter().map(String::as_str).collect();
+ write_to_file(out_path, |w| emit_stateful_pages_json(&refs, w))
+ }
+
+ /// Emit `.web/utils/context.js`.
+ ///
+ /// Ports `context_template` from
+ /// `packages/reflex-base/src/reflex_base/compiler/templates.py`.
+ ///
+ /// Args:
+ /// is_dev_mode: emitted as `export const isDevMode = …`.
+ /// default_color_mode_js: the JS expression assigned to
+ /// `defaultColorMode` (a quoted string or a lookup expr).
+ /// state_name: full dotted name of the state root, or `None`
+ /// for the no-state fallback.
+ /// state_keys: full dotted names of every state context.
+ /// initial_state_json: pre-serialized initial-state dict.
+ /// client_storage_json: pre-serialized client-storage config.
+ /// Emit `.web/app/root.jsx`.
+ ///
+ /// Ports `app_root_template`. Python pre-renders the dynamic
+ /// strings (imports, hooks, render_str, …) using
+ /// `_RenderUtils.render` + friends — those depend on the legacy
+ /// Python JSX renderer. Rust splices them into the static layout.
+ fn compile_app_root_module(
+ &self,
+ imports_str: &str,
+ dynamic_imports_str: &str,
+ custom_code_str: &str,
+ hooks_str: &str,
+ render_str: &str,
+ import_window_libraries: &str,
+ window_imports_str: &str,
+ out_path: &str,
+ ) -> PyResult<()> {
+ write_to_file(out_path, |w| {
+ emit_app_root_module(
+ imports_str,
+ dynamic_imports_str,
+ custom_code_str,
+ hooks_str,
+ render_str,
+ import_window_libraries,
+ window_imports_str,
+ w,
+ )
+ })
+ }
+
+ /// Emit `.web/app/_document.js`.
+ ///
+ /// Ports `document_root_template`. Python pre-renders the imports
+ /// list and the document JSX expression; Rust splices both into
+ /// the layout function.
+ fn compile_document_root_module(
+ &self,
+ imports_str: &str,
+ document_render_str: &str,
+ out_path: &str,
+ ) -> PyResult<()> {
+ write_to_file(out_path, |w| {
+ emit_document_root_module(imports_str, document_render_str, w)
+ })
+ }
+
+ #[pyo3(signature = (is_dev_mode, default_color_mode_js, state_name, state_keys, initial_state_json, client_storage_json, out_path))]
+ fn compile_context_module(
+ &self,
+ is_dev_mode: bool,
+ default_color_mode_js: &str,
+ state_name: Option<&str>,
+ state_keys: Vec<String>,
+ initial_state_json: &str,
+ client_storage_json: &str,
+ out_path: &str,
+ ) -> PyResult<()> {
+ let keys: Vec<&str> = state_keys.iter().map(String::as_str).collect();
+ write_to_file(out_path, |w| {
+ emit_context_module(
+ is_dev_mode,
+ default_color_mode_js,
+ state_name,
+ &keys,
+ initial_state_json,
+ client_storage_json,
+ w,
+ )
+ })
+ }
+
+ /// Run the memoize-decision walk on a Component PyObject.
+ ///
+ /// Ports `reflex.compiler.plugins.memoize._should_memoize` to Rust
+ /// (plan §0a phase 2 / §0b lever (b2)). Behavior-identical with the
+ /// legacy predicate: for any Component the legacy plugin would
+ /// memoize, this returns True; for any it would skip, False.
+ ///
+ /// Used by:
+ ///
+ /// * Parity tests (`tests/units/compiler/test_memoize_plugin.py`).
+ /// * Phase 3 (wrapper construction in Rust) — once the decision is
+ /// produced here, the same walk can drive `Component::Memoize`
+ /// wrapping during pyread.
+ fn should_memoize<'py>(
+ &self,
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ ) -> PyResult<bool> {
+ let pyrefs = PyRefs::new(py)?;
+ let refs = MemoRefs::from_pyrefs(py, &pyrefs)?;
+ Ok(memoize_should_memoize(py, component, &refs)?)
+ }
+
+ /// Mirror `Component._get_all_imports()` with the merge happening in
+ /// Rust. Walks `component`'s children + `_get_components_in_props()`,
+ /// calls each node's cached `_get_imports()`, and merges into a
+ /// `HashMap` rather than the Python `merge_parsed_imports` recursion.
+ ///
+ /// Returns the same shape `_get_all_imports` returns:
+ /// `dict[str, list[ImportVar]]` with no library-prefix transform —
+ /// callers wrap in `merge_imports(...)` for the `$/utils/...`
+ /// rewrite.
+ fn collect_all_imports<'py>(
+ &self,
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ ) -> PyResult<Bound<'py, PyDict>> {
+ pyread_collect_all_imports(py, component)
+ }
+
+ /// In-place variant of [`collect_all_imports`]: walks `component`'s
+ /// tree and merges every entry into `target` with the
+ /// `merge_imports` library-prefix transform (`$/utils/...`)
+ /// applied. The caller-owned `target` dict is mutated.
+ ///
+ /// Replaces the
+ /// `merge_imports(target, component._get_all_imports())` pattern in
+ /// `rust_pipeline.compile_pages` — accumulating across pages
+ /// into one dict cuts the O(N²) outer-loop iteration the Python
+ /// pattern incurs.
+ fn collect_all_imports_into<'py>(
+ &self,
+ py: Python<'py>,
+ target: &Bound<'py, PyDict>,
+ component: &Bound<'py, PyAny>,
+ ) -> PyResult<()> {
+ pyread_collect_all_imports_into(py, target, component)
+ }
+
+ /// Apply the `merge_imports` library-prefix transform to every
+ /// entry of `source` and append into `target` in place. Use this
+ /// for dicts that aren't paired with a Component tree walk (custom
+ /// component imports, hand-built import dicts), where the tree-
+ /// walking [`collect_all_imports_into`] doesn't apply.
+ fn merge_imports_into<'py>(
+ &self,
+ py: Python<'py>,
+ target: &Bound<'py, PyDict>,
+ source: &Bound<'py, PyDict>,
+ ) -> PyResult<()> {
+ pyread_merge_imports_into(py, target, source)
+ }
+
+ /// Snapshot the Rust-side per-phase timings from the most recent
+ /// `compile_page_from_component` (or `read_page` directly). Returns
+ /// a `dict[str, int]` keyed by phase name with nanosecond totals.
+ ///
+ /// Counters reset at the start of every `read_page`. Phase names
+ /// mirror the call sites in `pyo3_reader.rs`:
+ ///
+ /// * `class_name_ns` — `type(c).__name__` dispatch
+ /// * `resolve_tag_ns` — alias/tag/library reads in `resolve_tag_symbol`
+ /// * `import_alias_ns` — same attrs re-read in `import_alias_for`
+ /// * `needs_ref_ns` — `getattr("id")` check
+ /// * `read_props_ns`, `read_children_ns`, `read_event_handlers_ns`
+ /// * `read_var_data_ns` — Var._get_all_var_data + decode
+ /// * `harvest_register_ns` — RefCell mutations
+ /// * `emit_ns` — pure-Rust IR → JSX string build
+ /// * `read_page_total_ns` — end-to-end `read_page`
+ fn last_phase_timings_ns<'py>(&self, py: Python<'py>) -> PyResult<Bound<'py, PyDict>> {
+ let t = reflex_pyread::timing::snapshot();
+ let d = PyDict::new_bound(py);
+ d.set_item("read_page_total_ns", t.read_page_total_ns)?;
+ d.set_item("emit_ns", t.emit_ns)?;
+ d.set_item("class_name_ns", t.class_name_ns)?;
+ d.set_item("resolve_tag_ns", t.resolve_tag_ns)?;
+ d.set_item("import_alias_ns", t.import_alias_ns)?;
+ d.set_item("needs_ref_ns", t.needs_ref_ns)?;
+ d.set_item("read_var_data_ns", t.read_var_data_ns)?;
+ d.set_item("harvest_register_ns", t.harvest_register_ns)?;
+ d.set_item("get_props_call_ns", t.get_props_call_ns)?;
+ d.set_item("prop_value_getattr_ns", t.prop_value_getattr_ns)?;
+ d.set_item("children_attr_ns", t.children_attr_ns)?;
+ d.set_item("event_triggers_attr_ns", t.event_triggers_attr_ns)?;
+ d.set_item("isinstance_var_ns", t.isinstance_var_ns)?;
+ d.set_item("value_literal_dispatch_ns", t.value_literal_dispatch_ns)?;
+ d.set_item("var_js_expr_attr_ns", t.var_js_expr_attr_ns)?;
+ // Counts.
+ d.set_item("node_count", t.node_count)?;
+ d.set_item("element_count", t.element_count)?;
+ d.set_item("var_count", t.var_count)?;
+ d.set_item("prop_count", t.prop_count)?;
+ d.set_item("event_handler_count", t.event_handler_count)?;
+ Ok(d)
+ }
+
+ /// Compile a single page directly from a Python `Component` PyObject —
+ /// the new lever-(a) entry point that bypasses `bridge.py` + msgpack.
+ ///
+ /// The reader walks `component` via PyO3 `getattr` (see plan §0b and
+ /// `reflex_pyread::read_page`), builds the IR in-arena, and emits JSX.
+ /// The cache is not consulted; D5's Salsa storage keys on msgpack
+ /// content hashes and the pyread path doesn't produce one. Hot reload
+ /// gains incremental caching later.
+ ///
+ /// Args:
+ /// route_ident: JS identifier used for the route export.
+ /// component: the page's root `BaseComponent` instance.
+ /// route: URL path (e.g. `/about`).
+ /// title: optional document title.
+ /// meta_tags: optional `[(name_or_property, content), …]` list.
+ #[pyo3(signature = (route_ident, component, route, title=None, meta_tags=None, custom_code=None, hooks_body=None))]
+ fn compile_page_from_component<'py>(
+ &self,
+ py: Python<'py>,
+ route_ident: &str,
+ component: &Bound<'py, PyAny>,
+ route: &str,
+ title: Option<&str>,
+ meta_tags: Option<&Bound<'py, PyList>>,
+ custom_code: Option<Vec<String>>,
+ hooks_body: Option<&str>,
+ ) -> PyResult<String> {
+ let meta_pairs: Vec<(String, String)> = match meta_tags {
+ Some(list) => {
+ let mut out = Vec::with_capacity(list.len());
+ for item in list.iter() {
+ let tup: Bound<PyTuple> = item.downcast_into()?;
+ if tup.len() != 2 {
+ return Err(pyo3::exceptions::PyValueError::new_err(
+ "meta_tags entries must be (name, content) tuples",
+ ));
+ }
+ let n: String = tup.get_item(0)?.extract()?;
+ let c: String = tup.get_item(1)?.extract()?;
+ out.push((n, c));
+ }
+ out
+ }
+ None => Vec::new(),
+ };
+
+ let custom_code_owned: Vec<String> = custom_code.unwrap_or_default();
+ let custom_code_refs: Vec<&str> = custom_code_owned.iter().map(String::as_str).collect();
+ let hooks = hooks_body.unwrap_or("");
+
+ let refs = PyRefs::new(py)?;
+ let arena = Arena::new();
+ let page = read_page(py, component, route, title, &meta_pairs, &arena, &refs)?;
+ let mut buf = CodeBuffer::with_capacity(1024);
+ {
+ let _emit = reflex_pyread::TimingSpan::new(reflex_pyread::TimingField::Emit);
+ emit_page_with_extras(&mut buf, &page, route_ident, &custom_code_refs, hooks);
+ }
+ String::from_utf8(buf.into_bytes()).map_err(|e| {
+ pyo3::exceptions::PyValueError::new_err(format!(
+ "rust pyread emit produced non-utf8: {e}"
+ ))
+ })
+ }
+
+ /// Compile a whole app. Returns a `CompiledOutput` whose `files` dict maps
+ /// output paths (relative to the Vite project root) to UTF-8 byte blobs.
+ ///
+ /// `pages`: list of `(route_ident, route_path, page_ir_bytes)` triples.
+ /// `theme`: optional theme IR bytes.
+ /// `global_state`: optional global-state IR bytes.
+ /// `plugin_manifest`: optional plugin-manifest IR bytes.
+ #[pyo3(signature = (pages, theme=None, global_state=None, plugin_manifest=None))]
+ fn compile_app(
+ &self,
+ py: Python<'_>,
+ pages: &Bound<'_, PyList>,
+ theme: Option<&Bound<'_, PyBytes>>,
+ global_state: Option<&Bound<'_, PyBytes>>,
+ plugin_manifest: Option<&Bound<'_, PyBytes>>,
+ ) -> PyResult<CompiledOutput> {
+ let mut page_inputs: Vec<(String, String, Vec<u8>)> = Vec::with_capacity(pages.len());
+ for item in pages.iter() {
+ let tup: Bound<PyTuple> = item.downcast_into()?;
+ if tup.len() != 3 {
+ return Err(pyo3::exceptions::PyValueError::new_err(
+ "each page entry must be (route_ident, route_path, ir_bytes)",
+ ));
+ }
+ let ident: String = tup.get_item(0)?.extract()?;
+ let route: String = tup.get_item(1)?.extract()?;
+ let bytes: Vec<u8> = tup.get_item(2)?.extract::<&[u8]>()?.to_vec();
+ page_inputs.push((ident, route, bytes));
+ }
+ let theme_bytes = theme.map(|b| b.as_bytes().to_vec());
+ let state_bytes = global_state.map(|b| b.as_bytes().to_vec());
+ let plugin_bytes = plugin_manifest.map(|b| b.as_bytes().to_vec());
+
+ let db = self.db.clone();
+ let result = py
+ .allow_threads(move || compile_app_inner(&db, page_inputs, theme_bytes, state_bytes, plugin_bytes))
+ .map_err(map_err)?;
+ Ok(result)
+ }
+}
+
+fn map_err(e: CompileError) -> PyErr {
+ pyo3::exceptions::PyValueError::new_err(e.to_string())
+}
+
+#[derive(Debug, thiserror::Error)]
+enum CompileError {
+ #[error("page compile failed for {route_ident}: {source}")]
+ Page {
+ route_ident: String,
+ #[source]
+ source: reflex_db::DbError,
+ },
+ #[error("theme parse failed: {0}")]
+ Theme(reflex_ir::ParseError),
+ #[error("global-state parse failed: {0}")]
+ GlobalState(reflex_ir::ParseError),
+ #[error("plugin manifest parse failed: {0}")]
+ PluginManifest(reflex_ir::ParseError),
+}
+
+fn compile_page_with_sourcemap_inner(
+ route_ident: &str,
+ page_bytes: &[u8],
+) -> PyResult<(String, Vec<(u32, u32, u32, u32)>)> {
+ let arena = Arena::with_capacity(page_bytes.len() * 4);
+ let page = parse_page(&arena, page_bytes)
+ .map_err(|e| pyo3::exceptions::PyValueError::new_err(format!("page parse: {e}")))?;
+ let mut buf = CodeBuffer::with_capacity(page_bytes.len() * 2);
+ let mut map = SourceMap::new();
+ emit_page_with_map(&mut buf, &page, route_ident, &mut map);
+ let js = String::from_utf8(buf.into_bytes()).map_err(|e| {
+ pyo3::exceptions::PyValueError::new_err(format!("emit produced non-utf8: {e}"))
+ })?;
+ let mappings: Vec<(u32, u32, u32, u32)> = map
+ .entries()
+ .iter()
+ .map(|(offset, loc)| (*offset, loc.file.0, loc.line, loc.col))
+ .collect();
+ Ok((js, mappings))
+}
+
+fn compile_app_inner(
+ db: &CompilerDb,
+ pages: Vec<(String, String, Vec<u8>)>,
+ theme: Option<Vec<u8>>,
+ global_state: Option<Vec<u8>>,
+ plugin_manifest: Option<Vec<u8>>,
+) -> Result<CompiledOutput, CompileError> {
+ let arena = Arena::new();
+ let mut files: HashMap<String, Vec<u8>> = HashMap::with_capacity(pages.len() + 4);
+
+ // D11: parallel page emit via rayon. Cache hits still avoid work.
+ let parallel_inputs: Vec<(String, Vec<u8>)> = pages
+ .iter()
+ .map(|(ident, _, bytes)| (ident.clone(), bytes.clone()))
+ .collect();
+ let results = db.emit_pages_parallel(¶llel_inputs);
+ for ((ident, route, _), result) in pages.iter().zip(results.into_iter()) {
+ let rendered = result.map_err(|source| CompileError::Page {
+ route_ident: ident.clone(),
+ source,
+ })?;
+ let out_path = page_output_path(route);
+ files.insert(out_path, rendered.as_bytes().to_vec());
+ }
+
+ if let Some(bytes) = theme {
+ let theme = parse_theme(&arena, &bytes).map_err(CompileError::Theme)?;
+ let mut buf = CodeBuffer::with_capacity(1024);
+ emit_theme(&mut buf, &theme);
+ files.insert("src/styles/theme.css".to_owned(), buf.into_bytes());
+ }
+ if let Some(bytes) = global_state {
+ let state = parse_global_state(&arena, &bytes).map_err(CompileError::GlobalState)?;
+ let mut buf = CodeBuffer::with_capacity(2048);
+ emit_context(&mut buf, &state);
+ files.insert("src/context.js".to_owned(), buf.into_bytes());
+ }
+ if let Some(bytes) = plugin_manifest {
+ let manifest = parse_plugin_manifest(&arena, &bytes).map_err(CompileError::PluginManifest)?;
+ let mut buf = CodeBuffer::with_capacity(2048);
+ emit_app_root(&mut buf, &manifest);
+ files.insert("src/AppWrap.jsx".to_owned(), buf.into_bytes());
+
+ // Plugin static assets pass-through (artifact #7 in §4.5 — Python
+ // ships path+bytes, Rust copies into the output map verbatim).
+ for plugin in manifest.plugins {
+ for (path, body) in plugin.static_assets {
+ files.insert(
+ reflex_intern::resolve_unchecked(*path).to_owned(),
+ body.to_vec(),
+ );
+ }
+ }
+ }
+
+ // Always emit a Vite config — Python doesn't need to opt in.
+ let mut vite_buf = CodeBuffer::with_capacity(512);
+ emit_vite_config(&mut vite_buf, "");
+ files.insert("vite.config.js".to_owned(), vite_buf.into_bytes());
+
+ Ok(CompiledOutput {
+ files,
+ orphans: Vec::new(),
+ diagnostics: Vec::new(),
+ })
+}
+
+/// Convert a route path to the emitted JS module path. `/` → `pages/index.jsx`,
+/// `/about` → `pages/about.jsx`, `/foo/bar` → `pages/foo/bar.jsx`. The Python
+/// side will respect this layout when writing files.
+fn page_output_path(route: &str) -> String {
+ let trimmed = route.trim_start_matches('/');
+ if trimmed.is_empty() {
+ return "pages/index.jsx".to_owned();
+ }
+ let mut out = String::with_capacity(8 + trimmed.len());
+ out.push_str("pages/");
+ out.push_str(trimmed);
+ out.push_str(".jsx");
+ out
+}
+
+#[pyclass]
+pub struct CompiledOutput {
+ files: HashMap<String, Vec<u8>>,
+ orphans: Vec<String>,
+ diagnostics: Vec<String>,
+}
+
+#[pymethods]
+impl CompiledOutput {
+ /// Return the rendered files as a `dict[str, bytes]`.
+ fn files<'py>(&self, py: Python<'py>) -> PyResult<Bound<'py, PyDict>> {
+ let dict = PyDict::new_bound(py);
+ for (path, contents) in &self.files {
+ dict.set_item(path, PyBytes::new_bound(py, contents))?;
+ }
+ Ok(dict)
+ }
+
+ /// Paths the Python side should delete (no longer emitted by Rust).
+ fn orphans(&self) -> Vec<String> {
+ self.orphans.clone()
+ }
+
+ /// Compiler diagnostics. List of pre-formatted strings for now; D11 will
+ /// convert to structured `miette`-style records.
+ fn diagnostics(&self) -> Vec<String> {
+ self.diagnostics.clone()
+ }
+
+ fn __repr__(&self) -> String {
+ format!(
+ "CompiledOutput(files={}, orphans={}, diagnostics={})",
+ self.files.len(),
+ self.orphans.len(),
+ self.diagnostics.len()
+ )
+ }
+}
+
+/// Open `out_path` for buffered write and run `f` on the writer, mapping
+/// any `io::Error` into a Python `OSError`.
+///
+/// Used by every "build content + write to disk" PyO3 method on
+/// `CompilerSession` so the buffering, error mapping, and flush
+/// behaviour stay consistent across the whole static-artifact surface.
+fn write_to_file<F>(out_path: &str, f: F) -> PyResult<()>
+where
+ F: FnOnce(&mut std::io::BufWriter<std::fs::File>) -> std::io::Result<()>,
+{
+ let file = std::fs::File::create(out_path)
+ .map_err(|e| pyo3::exceptions::PyOSError::new_err(format!("{out_path}: {e}")))?;
+ let mut w = std::io::BufWriter::new(file);
+ f(&mut w).map_err(|e| pyo3::exceptions::PyOSError::new_err(e.to_string()))?;
+ std::io::Write::flush(&mut w)
+ .map_err(|e| pyo3::exceptions::PyOSError::new_err(e.to_string()))
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_pyread/Cargo.toml
new file mode 100644
index 00000000000..7e9b75e926d
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "reflex_pyread"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+# `pyo3` is optional so the pure-Rust helpers (string decoders, etc.) can
+# be unit-tested with `--no-default-features` — uv's snap-managed Python
+# hides libpython from the system linker, so anything that drags pyo3 in
+# fails to link a test binary.
+#
+# `reflex_py` (the cdylib) re-enables this feature plus `extension-module`
+# via its own dep declaration; in normal `maturin develop` builds the
+# `pyo3` feature here stays on.
+pyo3 = { version = "0.22", default-features = false, features = ["abi3-py310"], optional = true }
+
+thiserror = { workspace = true }
+reflex_ir = { workspace = true }
+reflex_arena = { workspace = true }
+reflex_intern = { workspace = true }
+
+[features]
+default = ["pyo3"]
+pyo3 = ["dep:pyo3"]
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/src/imports.rs b/packages/reflex-compiler-rust/crates/reflex_pyread/src/imports.rs
new file mode 100644
index 00000000000..fb598887e2f
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/src/imports.rs
@@ -0,0 +1,196 @@
+//! Rust mirror of `reflex_base.components.component.Component._get_all_imports`
+//! and `reflex_base.utils.imports.merge_imports`.
+//!
+//! Why this exists: profiling `reflex run-rust` on the docs app showed
+//! `_get_all_imports` + `merge_imports` at ~1.3 s cumulative for 7 pages
+//! — 5.2M iterations through a Python generator. Pushing the walk and
+//! merge into Rust drops the inner recursion and lets `compile_pages`
+//! accumulate into a single Python dict in-place instead of rebuilding
+//! it once per page / memo body.
+//!
+//! Three entry points:
+//!
+//! * [`collect_all_imports`] — non-mutating: returns a fresh dict
+//! shaped like `_get_all_imports` returns (no `$` prefix).
+//! * [`collect_all_imports_into`] — walks the tree and **merges into a
+//! caller-owned target dict** with the `$/utils/...` prefix transform
+//! applied per key. Replaces the legacy
+//! `merge_imports(target, component._get_all_imports())` pattern.
+//! * [`merge_imports_into`] — same prefix transform applied to an
+//! already-built `ParsedImportDict`, no tree walk.
+//!
+//! The per-Component `_get_imports` work stays on the Python side because
+//! user subclasses override it via `add_imports()`; the walker dispatches
+//! through PyO3 callbacks rather than reimplementing the override chain.
+//!
+//! See `RUST_REWRITE_PLAN.md` lever (a) — page-level harvest walks.
+
+use std::collections::HashMap;
+
+use pyo3::prelude::*;
+use pyo3::types::{PyAnyMethods, PyDict, PyList, PyString, PyStringMethods};
+
+/// Library-name prefixes that get rewritten to `$<prefix>` so Vite's
+/// `$` alias resolves them to `.web/<prefix>/...`. Mirrors
+/// `reflex_base.utils.imports.merge_imports`.
+const ALIAS_PREFIXES: &[&str] = &["/utils/", "/components/", "/styles/", "/public/"];
+
+fn apply_alias_prefix(lib: &str) -> String {
+ if ALIAS_PREFIXES.iter().any(|p| lib.starts_with(p)) {
+ let mut out = String::with_capacity(lib.len() + 1);
+ out.push('$');
+ out.push_str(lib);
+ out
+ } else {
+ lib.to_owned()
+ }
+}
+
+/// Walk `root`'s component tree (children + `_get_components_in_props()`)
+/// and return a merged `dict[str, list[ImportVar]]` — no `$/utils/...`
+/// rewrite. Use this when the caller wants the raw shape Python's
+/// `_get_all_imports` returns.
+pub fn collect_all_imports<'py>(
+ py: Python<'py>,
+ root: &Bound<'py, PyAny>,
+) -> PyResult<Bound<'py, PyDict>> {
+ let mut acc: HashMap<String, Vec<PyObject>> = HashMap::new();
+ walk_raw(py, root, &mut acc)?;
+
+ let out = PyDict::new_bound(py);
+ for (lib, items) in acc {
+ let list = PyList::new_bound(py, items);
+ out.set_item(lib, list)?;
+ }
+ Ok(out)
+}
+
+/// Walk `root`'s tree like [`collect_all_imports`], applying the
+/// `$/utils/...` prefix transform per key, and append every entry into
+/// `target` in place. The caller-owned target dict is mutated so the
+/// page loop can accumulate across pages without rebuilding the dict on
+/// each iteration — the costly pattern profiling exposed.
+///
+/// `target` is expected to be `dict[str, list[ImportVar]]`. For
+/// libraries already present in `target`, items are appended to the
+/// existing list; otherwise a fresh list is created.
+pub fn collect_all_imports_into<'py>(
+ py: Python<'py>,
+ target: &Bound<'py, PyDict>,
+ root: &Bound<'py, PyAny>,
+) -> PyResult<()> {
+ walk_into(py, root, target)
+}
+
+/// Apply the `$/utils/...` prefix transform to every entry of `source`
+/// and append into `target` in place. Equivalent to
+/// `merge_imports(target, source)` from
+/// `reflex_base.utils.imports` for the `ParsedImportDict` case (no
+/// `str`/`set`/`tuple` field dispatch — callers must pre-normalize via
+/// `parse_imports` if needed).
+pub fn merge_imports_into<'py>(
+ py: Python<'py>,
+ target: &Bound<'py, PyDict>,
+ source: &Bound<'py, PyDict>,
+) -> PyResult<()> {
+ for (lib_obj, items_obj) in source.iter() {
+ let lib_str = lib_obj.downcast::<PyString>()?.to_str()?;
+ let new_lib = apply_alias_prefix(lib_str);
+ append_items(py, target, &new_lib, &items_obj)?;
+ }
+ Ok(())
+}
+
+fn walk_raw<'py>(
+ py: Python<'py>,
+ node: &Bound<'py, PyAny>,
+ acc: &mut HashMap<String, Vec<PyObject>>,
+) -> PyResult<()> {
+ let imports_obj = node.call_method0("_get_imports")?;
+ let imports_dict = imports_obj.downcast::<PyDict>()?;
+ for (lib_obj, items_obj) in imports_dict.iter() {
+ let lib_py = lib_obj.downcast::<PyString>()?;
+ let lib = lib_py.to_str()?.to_owned();
+ let items_list = items_obj.downcast::<PyList>()?;
+ let bucket = acc.entry(lib).or_default();
+ bucket.reserve(items_list.len());
+ for item in items_list.iter() {
+ bucket.push(item.unbind());
+ }
+ }
+
+ recurse_children_and_prop_components(py, node, &mut |child| walk_raw(py, child, acc))
+}
+
+fn walk_into<'py>(
+ py: Python<'py>,
+ node: &Bound<'py, PyAny>,
+ target: &Bound<'py, PyDict>,
+) -> PyResult<()> {
+ let imports_obj = node.call_method0("_get_imports")?;
+ let imports_dict = imports_obj.downcast::<PyDict>()?;
+ for (lib_obj, items_obj) in imports_dict.iter() {
+ let lib_str = lib_obj.downcast::<PyString>()?.to_str()?;
+ let new_lib = apply_alias_prefix(lib_str);
+ append_items(py, target, &new_lib, &items_obj)?;
+ }
+
+ recurse_children_and_prop_components(py, node, &mut |child| walk_into(py, child, target))
+}
+
+fn recurse_children_and_prop_components<'py, F>(
+ py: Python<'py>,
+ node: &Bound<'py, PyAny>,
+ visit: &mut F,
+) -> PyResult<()>
+where
+ F: FnMut(&Bound<'py, PyAny>) -> PyResult<()>,
+{
+ if let Ok(children) = node.getattr("children") {
+ if !children.is_none() {
+ if let Ok(iter) = children.iter() {
+ for c in iter {
+ let child = c?;
+ visit(&child)?;
+ }
+ }
+ }
+ }
+
+ if let Ok(prop_components) = node.call_method0("_get_components_in_props") {
+ if let Ok(iter) = prop_components.iter() {
+ for c in iter {
+ let prop_comp = c?;
+ visit(&prop_comp)?;
+ }
+ }
+ }
+
+ let _ = py;
+ Ok(())
+}
+
+/// Append every element of `items_obj` (any iterable, but typically a
+/// `list[ImportVar]`) to `target[lib]`. Creates the bucket as a fresh
+/// `list` on first sight so we never mutate a cached `_get_imports()`
+/// result.
+fn append_items<'py>(
+ py: Python<'py>,
+ target: &Bound<'py, PyDict>,
+ lib: &str,
+ items_obj: &Bound<'py, PyAny>,
+) -> PyResult<()> {
+ let items_list = items_obj.downcast::<PyList>()?;
+ match target.get_item(lib)? {
+ Some(existing) => {
+ let existing_list = existing.downcast::<PyList>()?;
+ existing_list.call_method1("extend", (items_list,))?;
+ }
+ None => {
+ let new_list = PyList::empty_bound(py);
+ new_list.call_method1("extend", (items_list,))?;
+ target.set_item(lib, new_list)?;
+ }
+ }
+ Ok(())
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_pyread/src/lib.rs
new file mode 100644
index 00000000000..94cc0fd276e
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/src/lib.rs
@@ -0,0 +1,46 @@
+//! PyO3 Component-tree reader. See plan §0b lever (a).
+//!
+//! Replaces `reflex/compiler/ir/bridge.py` by walking Reflex `Component`
+//! PyObjects directly via PyO3 `getattr`. Each Python attribute access is
+//! ~100 ns (per spike measurement); a 165-node page costs ~80 µs, vs
+//! ~3.9 ms for the msgpack bridge.
+//!
+//! The reader produces the same `reflex_ir::Component<'arena>` tree the
+//! msgpack parser produces, so downstream codegen is unchanged. Strings
+//! are arena-allocated; identifiers are interned.
+//!
+//! The pyo3 dep is feature-gated (default-on). `--no-default-features`
+//! builds skip pyo3 so the pure-Rust helpers in `text` can be unit-tested
+//! without libpython on the system linker — uv's snap-managed Python isn't
+//! visible to `cc`. End-to-end coverage of the PyO3 reader runs through
+//! `reflex_py`'s wheel tests (plan task #7).
+
+#![forbid(unsafe_code)]
+
+pub mod text;
+
+#[cfg(feature = "pyo3")]
+mod pyo3_reader;
+
+#[cfg(feature = "pyo3")]
+pub mod memoize;
+
+#[cfg(feature = "pyo3")]
+pub mod imports;
+
+#[cfg(feature = "pyo3")]
+pub mod timing;
+
+#[cfg(feature = "pyo3")]
+pub use pyo3_reader::{read_page, PyReadError, PyRefs};
+
+#[cfg(feature = "pyo3")]
+pub use memoize::{should_memoize, MemoRefs};
+
+#[cfg(feature = "pyo3")]
+pub use imports::{collect_all_imports, collect_all_imports_into, merge_imports_into};
+
+#[cfg(feature = "pyo3")]
+pub use timing::{
+ Counter as TimingCounter, Field as TimingField, PhaseTimings, Span as TimingSpan,
+};
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/src/memoize.rs b/packages/reflex-compiler-rust/crates/reflex_pyread/src/memoize.rs
new file mode 100644
index 00000000000..c20f4402507
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/src/memoize.rs
@@ -0,0 +1,441 @@
+//! Rust port of `reflex.compiler.plugins.memoize._should_memoize` and
+//! `_subtree_has_reactive_data`. See plan §0a phase 2 / §0b lever (b2).
+//!
+//! Operates on Python `Component` PyObjects via PyO3 — the framework
+//! primitives (`Component._memoization_mode`, `Component._get_vars`,
+//! `_get_hooks_internal`, `Var._get_all_var_data`, etc.) are read with
+//! `getattr`/`call_method` instead of through the IR. The decision logic
+//! itself runs in Rust.
+//!
+//! Used by:
+//!
+//! * `compute_should_memoize(component)` — PyO3-exposed predicate that
+//! matches the legacy plugin's per-node decision. Foundation for
+//! phase 3, where wrapper construction moves to Rust too.
+
+use std::collections::{HashMap, HashSet};
+
+use pyo3::prelude::*;
+use pyo3::types::{PyAnyMethods, PyDict};
+
+use super::pyo3_reader::{class_name, py_str, PyReadError, PyRefs};
+
+/// Memoize plugin's per-node decision, ported from
+/// `reflex.compiler.plugins.memoize._should_memoize`.
+///
+/// Returns `Ok(true)` iff `component` is a candidate for auto-memoization.
+/// The PyO3 boundary keeps the contract identical to the Python version —
+/// every framework lookup (disposition, hooks, vars, var_data) goes
+/// through `getattr`/`call_method` on the live Component.
+pub fn should_memoize<'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ refs: &MemoRefs<'py>,
+) -> Result<bool, PyReadError> {
+ let disposition = read_disposition(component)?;
+ if disposition == Disposition::Never {
+ return Ok(false);
+ }
+
+ let cls = class_name(component)?;
+
+ // Bare: short-circuit on contents-Var's var_data.
+ if cls == "Bare" {
+ if let Some(b) = bare_should_memoize(py, component, refs)? {
+ if b {
+ return Ok(true);
+ }
+ }
+ }
+
+ let tag = component
+ .getattr("tag")
+ .ok()
+ .filter(|v| !v.is_none());
+ let is_cond_or_match = matches!(cls.as_str(), "Cond" | "Match");
+ let is_structural_child = is_structural_memoization_child(&cls);
+ if tag.is_none() && !is_cond_or_match && !is_structural_child {
+ return Ok(false);
+ }
+
+ if disposition == Disposition::Always {
+ return Ok(true);
+ }
+
+ // Direct props (include_children=False).
+ let prop_vars = component
+ .call_method1("_get_vars", (false,))
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._get_vars(include_children=False)",
+ source,
+ })?;
+ let prop_iter = prop_vars.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(_get_vars())",
+ source,
+ })?;
+ let mut cache: HashMap<usize, bool> = HashMap::new();
+ for var_res in prop_iter {
+ let prop_var = var_res.map_err(|source| PyReadError::Attr {
+ attr: "_get_vars()[i]",
+ source,
+ })?;
+ if var_data_indicates_reactive(py, &prop_var, refs, &mut cache)? {
+ return Ok(true);
+ }
+ }
+
+ let boundary = is_snapshot_boundary(component)?;
+ if is_strategy_snapshot(boundary, is_structural_child) && !boundary {
+ return Ok(true);
+ }
+ if boundary && subtree_has_reactive_data(py, component, refs, &mut cache)? {
+ return Ok(true);
+ }
+
+ // Event triggers — non-empty dict means memo-wrap to stabilize callbacks.
+ let triggers = component
+ .getattr("event_triggers")
+ .ok()
+ .filter(|v| !v.is_none());
+ match triggers {
+ Some(t) => {
+ let has = match t.downcast::<PyDict>() {
+ Ok(d) => !d.is_empty(),
+ Err(_) => t.is_truthy().unwrap_or(false),
+ };
+ Ok(has)
+ }
+ None => Ok(false),
+ }
+}
+
+/// Whether `component`'s subtree carries reactive signals worth memoizing.
+///
+/// Mirrors `_subtree_has_reactive_data` + `_component_subtree_is_reactive`.
+/// The `id()`-keyed cache breaks the `var_data.components` ↔ children
+/// graph cycles the same way the Python version does.
+pub fn subtree_has_reactive_data<'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ refs: &MemoRefs<'py>,
+ cache: &mut HashMap<usize, bool>,
+) -> Result<bool, PyReadError> {
+ let id = component.as_ptr() as usize;
+ if let Some(&cached) = cache.get(&id) {
+ return Ok(cached);
+ }
+ // Placeholder to break cycles — matches Python.
+ cache.insert(id, false);
+ let result = component_subtree_is_reactive(py, component, refs, cache)?;
+ cache.insert(id, result);
+ Ok(result)
+}
+
+fn component_subtree_is_reactive<'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ refs: &MemoRefs<'py>,
+ cache: &mut HashMap<usize, bool>,
+) -> Result<bool, PyReadError> {
+ // Filter out the ref hook (static-id useRef) from _get_hooks_internal.
+ let ref_hook = component
+ .call_method0("_get_ref_hook")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._get_ref_hook",
+ source,
+ })?;
+ let ref_hook_key: Option<String> = if ref_hook.is_none() {
+ None
+ } else {
+ Some(py_str(&ref_hook)?)
+ };
+
+ let hooks_internal = component
+ .call_method0("_get_hooks_internal")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._get_hooks_internal",
+ source,
+ })?;
+ if !hooks_internal.is_none() {
+ // `_get_hooks_internal` returns a dict (or dict-like) keyed by
+ // hook code; iterate keys uniformly via the generic Python iter
+ // protocol (works for both PyDict and any dict-shaped mapping).
+ let iterable: Bound<'_, PyAny> = if let Ok(d) = hooks_internal.downcast::<PyDict>() {
+ d.keys().into_any()
+ } else {
+ hooks_internal.clone()
+ };
+ for k_res in iterable.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(_get_hooks_internal())",
+ source,
+ })? {
+ let k = k_res.map_err(|source| PyReadError::Attr {
+ attr: "_get_hooks_internal()[i]",
+ source,
+ })?;
+ let key_str = py_str(&k)?;
+ if ref_hook_key.as_deref() != Some(key_str.as_str()) {
+ return Ok(true);
+ }
+ }
+ }
+
+ let hooks_str = component
+ .call_method0("_get_hooks")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._get_hooks",
+ source,
+ })?;
+ if !hooks_str.is_none() {
+ return Ok(true);
+ }
+ let added = component
+ .call_method0("_get_added_hooks")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._get_added_hooks",
+ source,
+ })?;
+ if !added.is_none() && added.is_truthy().unwrap_or(false) {
+ return Ok(true);
+ }
+
+ // Own props (include_children=False).
+ let prop_vars = component
+ .call_method1("_get_vars", (false,))
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._get_vars(include_children=False)",
+ source,
+ })?;
+ for var_res in prop_vars.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(_get_vars())",
+ source,
+ })? {
+ let var = var_res.map_err(|source| PyReadError::Attr {
+ attr: "_get_vars()[i]",
+ source,
+ })?;
+ if var_data_indicates_reactive(py, &var, refs, cache)? {
+ return Ok(true);
+ }
+ }
+
+ // Children.
+ let children = component
+ .getattr("children")
+ .ok()
+ .filter(|v| !v.is_none());
+ if let Some(c) = children {
+ for child_res in c.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(children)",
+ source,
+ })? {
+ let child = child_res.map_err(|source| PyReadError::Attr {
+ attr: "children[i]",
+ source,
+ })?;
+ // The legacy walk only recurses through Components. Non-
+ // Component children (raw strings, numbers wrapped at compile
+ // time) carry no reactive signal.
+ if !is_component_subclass(&child, refs)? {
+ continue;
+ }
+ if subtree_has_reactive_data(py, &child, refs, cache)? {
+ return Ok(true);
+ }
+ }
+ }
+ Ok(false)
+}
+
+/// `var._get_all_var_data()` carries `state`, `hooks`, and `components`.
+/// Returns True iff any of those signals fire.
+fn var_data_indicates_reactive<'py>(
+ py: Python<'py>,
+ var: &Bound<'py, PyAny>,
+ refs: &MemoRefs<'py>,
+ cache: &mut HashMap<usize, bool>,
+) -> Result<bool, PyReadError> {
+ let vd = var
+ .call_method0("_get_all_var_data")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Var._get_all_var_data",
+ source,
+ })?;
+ if vd.is_none() {
+ return Ok(false);
+ }
+ if attr_truthy(&vd, "state")? || attr_truthy(&vd, "hooks")? {
+ return Ok(true);
+ }
+ let embedded = match vd.getattr("components") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(false),
+ };
+ for item_res in embedded.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(var_data.components)",
+ source,
+ })? {
+ let item = item_res.map_err(|source| PyReadError::Attr {
+ attr: "var_data.components[i]",
+ source,
+ })?;
+ if !is_component_subclass(&item, refs)? {
+ continue;
+ }
+ if subtree_has_reactive_data(py, &item, refs, cache)? {
+ return Ok(true);
+ }
+ }
+ Ok(false)
+}
+
+fn bare_should_memoize<'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ refs: &MemoRefs<'py>,
+) -> Result<Option<bool>, PyReadError> {
+ let contents = component
+ .getattr("contents")
+ .ok()
+ .filter(|v| !v.is_none());
+ let Some(contents) = contents else {
+ return Ok(None);
+ };
+ // Only Vars carry var_data. Non-Var contents short-circuit to None.
+ let is_var = contents
+ .is_instance(&refs.var_cls)
+ .map_err(|source| PyReadError::Attr {
+ attr: "isinstance(Bare.contents, Var)",
+ source,
+ })?;
+ if !is_var {
+ return Ok(None);
+ }
+ let mut cache: HashMap<usize, bool> = HashMap::new();
+ Ok(Some(var_data_indicates_reactive(py, &contents, refs, &mut cache)?))
+}
+
+// ---- Helpers ---------------------------------------------------------------
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum Disposition {
+ Stateful,
+ Always,
+ Never,
+}
+
+fn read_disposition(component: &Bound<'_, PyAny>) -> Result<Disposition, PyReadError> {
+ let mode = component
+ .getattr("_memoization_mode")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._memoization_mode",
+ source,
+ })?;
+ let disp = mode
+ .getattr("disposition")
+ .map_err(|source| PyReadError::Attr {
+ attr: "MemoizationMode.disposition",
+ source,
+ })?;
+ let value = disp
+ .getattr("value")
+ .map_err(|source| PyReadError::Attr {
+ attr: "MemoizationDisposition.value",
+ source,
+ })?;
+ let s = py_str(&value)?;
+ match s.as_str() {
+ "stateful" => Ok(Disposition::Stateful),
+ "always" => Ok(Disposition::Always),
+ "never" => Ok(Disposition::Never),
+ other => Err(PyReadError::TypeMismatch {
+ attr: "MemoizationDisposition.value",
+ expected: "stateful|always|never",
+ got: other.to_owned(),
+ }),
+ }
+}
+
+fn is_snapshot_boundary(component: &Bound<'_, PyAny>) -> Result<bool, PyReadError> {
+ let mode = component
+ .getattr("_memoization_mode")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component._memoization_mode",
+ source,
+ })?;
+ let recursive = mode
+ .getattr("recursive")
+ .map_err(|source| PyReadError::Attr {
+ attr: "MemoizationMode.recursive",
+ source,
+ })?;
+ let r: bool = recursive.extract().map_err(|source| PyReadError::Attr {
+ attr: "recursive.extract::<bool>()",
+ source,
+ })?;
+ Ok(!r)
+}
+
+fn is_structural_memoization_child(cls_name: &str) -> bool {
+ // Mirrors `_is_structural_memoization_child` — currently restricted
+ // to `Foreach`.
+ cls_name == "Foreach"
+}
+
+fn is_strategy_snapshot(boundary: bool, structural_child: bool) -> bool {
+ // `get_memoization_strategy` returns SNAPSHOT iff snapshot boundary
+ // or structural child.
+ boundary || structural_child
+}
+
+fn attr_truthy(obj: &Bound<'_, PyAny>, name: &str) -> Result<bool, PyReadError> {
+ let v = obj.getattr(name).ok().filter(|v| !v.is_none());
+ Ok(match v {
+ Some(x) => x.is_truthy().unwrap_or(false),
+ None => false,
+ })
+}
+
+fn is_component_subclass(obj: &Bound<'_, PyAny>, refs: &MemoRefs<'_>) -> Result<bool, PyReadError> {
+ obj.is_instance(&refs.component_cls)
+ .map_err(|source| PyReadError::Attr {
+ attr: "isinstance(obj, Component)",
+ source,
+ })
+}
+
+// ---- Cached PyObjects ------------------------------------------------------
+
+/// Framework classes the memoize-decision walk uses.
+///
+/// Built on top of `PyRefs` (Var/LiteralVar) — we cache the `Component`
+/// class here too so children/var_data.components can be filtered by
+/// type quickly. Building this once per page mirrors the cost story of
+/// pyread itself: ~10 µs lookup amortized across hundreds of nodes.
+pub struct MemoRefs<'py> {
+ pub var_cls: Bound<'py, PyAny>,
+ pub component_cls: Bound<'py, PyAny>,
+}
+
+impl<'py> MemoRefs<'py> {
+ pub fn from_pyrefs(py: Python<'py>, pyrefs: &PyRefs<'py>) -> Result<Self, PyReadError> {
+ let component_cls = py
+ .import_bound("reflex_base.components.component")
+ .and_then(|m| m.getattr("Component"))
+ .map_err(|source| PyReadError::Attr {
+ attr: "reflex_base.components.component.Component",
+ source,
+ })?;
+ Ok(Self {
+ var_cls: pyrefs.var_cls.clone(),
+ component_cls,
+ })
+ }
+}
+
+// Unused-import guard for the HashSet import — kept around for future
+// use (the legacy walk could be extended with per-page seen-sets).
+#[allow(dead_code)]
+fn _hash_set_marker() -> HashSet<usize> {
+ HashSet::new()
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/src/pyo3_reader.rs b/packages/reflex-compiler-rust/crates/reflex_pyread/src/pyo3_reader.rs
new file mode 100644
index 00000000000..64f5c224353
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/src/pyo3_reader.rs
@@ -0,0 +1,1507 @@
+//! PyO3 walk over a Reflex `Component` PyObject → `reflex_ir::Page<'arena>`.
+//!
+//! Mirrors `reflex/compiler/ir/bridge.py` one-for-one. Every supported
+//! Component subclass dispatches on `type(component).__name__`; props,
+//! events, and child references go through PyO3 `getattr` calls.
+//!
+//! Coverage matches the bridge's: Bare, Fragment, Cond, Foreach, Match,
+//! and generic Element. CustomComponent and memo-wrapper subclasses fall
+//! through to the generic Element path the same way the bridge does.
+//!
+//! Var values produce `Value::JsExpr { expr, var_data }` — the same shape
+//! the msgpack parser builds — so downstream codegen needs no changes.
+
+use std::cell::RefCell;
+use std::collections::HashSet;
+
+use pyo3::prelude::*;
+use pyo3::types::{
+ PyAnyMethods, PyBool, PyDict, PyFloat, PyInt, PyList, PyMapping, PyString, PyStringMethods,
+ PyTuple, PyTypeMethods,
+};
+
+use reflex_arena::Arena;
+use reflex_intern::{intern, Symbol};
+use reflex_ir::{
+ Component, EventHandler, Hook, Literal, MatchArm, Meta, NodeId, Page, PyFileId, SourceLoc,
+ Value, VarData,
+};
+
+use super::text::decode_js_string_literal;
+use super::timing::{self, Counter as TC, Field as TF, Span as TSpan};
+
+/// Wire schema version this reader emits. Matches `reflex_ir::parse`'s
+/// `SCHEMA_VERSION`. The reader doesn't go through msgpack, but downstream
+/// codegen branches on `Page.schema_version`.
+const SCHEMA_VERSION: u32 = 2;
+
+/// Errors raised by the PyO3 component reader.
+///
+/// Surfaced as Python `ValueError`s via `CompilerSession`. They carry
+/// enough context to map back to the originating Component without a
+/// stack trace.
+#[derive(Debug, thiserror::Error)]
+pub enum PyReadError {
+ #[error("pyo3 attribute error on `{attr}`: {source}")]
+ Attr {
+ attr: &'static str,
+ #[source]
+ source: PyErr,
+ },
+ #[error("pyread does not yet support Component subclass `{class}`")]
+ Unsupported { class: String },
+ #[error("pyread type error on `{attr}`: expected {expected}, got {got}")]
+ TypeMismatch {
+ attr: &'static str,
+ expected: &'static str,
+ got: String,
+ },
+}
+
+impl From<PyReadError> for PyErr {
+ fn from(e: PyReadError) -> Self {
+ pyo3::exceptions::PyValueError::new_err(e.to_string())
+ }
+}
+
+/// Cached PyObject handles the reader needs on the hot path.
+///
+/// Resolved once per `read_page` call instead of per node — the
+/// `import_bound` lookup is ~10 µs but `is_instance` against a cached
+/// class is ~100 ns. With ~165 nodes/page and ~5 isinstance checks each,
+/// caching saves ~8 ms.
+pub struct PyRefs<'py> {
+ pub var_cls: Bound<'py, PyAny>,
+ pub literal_var_cls: Bound<'py, PyAny>,
+ /// `reflex_base.utils.format.format_library_name` for normalizing
+ /// `Component.library` and `VarData.imports` module specifiers.
+ pub format_library_name: Bound<'py, PyAny>,
+ /// Page-level harvests accumulated inline during `read_page` so we
+ /// don't have to re-walk the Python tree three more times for
+ /// `component_imports` / `state_bindings` / `needs_ref`. Interior
+ /// mutability keeps the read helpers' `&PyRefs` signatures intact;
+ /// every borrow is scoped to a single registration to avoid
+ /// runtime aliasing panics.
+ pub harvest: RefCell<HarvestState>,
+}
+
+/// Page-level data the bridge collects during `read_page`. Equivalent to
+/// what `collect_component_imports` / `collect_state_bindings` /
+/// `scan_needs_ref` used to compute in three separate walks; now
+/// accumulated in one pass by the read helpers as they visit each
+/// node.
+#[derive(Default)]
+pub struct HarvestState {
+ component_imports: Vec<(Symbol, Symbol)>,
+ component_imports_seen: HashSet<(Symbol, Symbol)>,
+ state_bindings: Vec<Symbol>,
+ state_bindings_seen: HashSet<String>,
+ needs_ref: bool,
+}
+
+impl HarvestState {
+ pub fn add_component_import(&mut self, pair: (Symbol, Symbol)) {
+ if self.component_imports_seen.insert(pair) {
+ self.component_imports.push(pair);
+ }
+ }
+
+ pub fn add_state_idents_in(&mut self, expr: &str) {
+ for ident in find_state_idents(expr) {
+ if self.state_bindings_seen.insert(ident.clone()) {
+ self.state_bindings.push(intern(&ident));
+ }
+ }
+ }
+
+ pub fn mark_needs_ref(&mut self) {
+ self.needs_ref = true;
+ }
+}
+
+impl<'py> PyRefs<'py> {
+ pub fn new(py: Python<'py>) -> Result<Self, PyReadError> {
+ let vars_mod = py
+ .import_bound("reflex_base.vars.base")
+ .map_err(|source| PyReadError::Attr {
+ attr: "import reflex_base.vars.base",
+ source,
+ })?;
+ let var_cls = vars_mod.getattr("Var").map_err(|source| PyReadError::Attr {
+ attr: "reflex_base.vars.base.Var",
+ source,
+ })?;
+ let literal_var_cls = vars_mod
+ .getattr("LiteralVar")
+ .map_err(|source| PyReadError::Attr {
+ attr: "reflex_base.vars.base.LiteralVar",
+ source,
+ })?;
+ let format_library_name = py
+ .import_bound("reflex_base.utils.format")
+ .and_then(|m| m.getattr("format_library_name"))
+ .map_err(|source| PyReadError::Attr {
+ attr: "reflex_base.utils.format.format_library_name",
+ source,
+ })?;
+ Ok(Self {
+ var_cls,
+ literal_var_cls,
+ format_library_name,
+ harvest: RefCell::new(HarvestState::default()),
+ })
+ }
+}
+
+// ---- Top-level Page entry ---------------------------------------------------
+
+/// Read a page's root Component into a `reflex_ir::Page<'arena>`.
+///
+/// Mirrors `reflex.compiler.ir.bridge.page_to_ir`.
+pub fn read_page<'arena, 'py>(
+ py: Python<'py>,
+ root: &Bound<'py, PyAny>,
+ route: &str,
+ title: Option<&str>,
+ meta_tags: &[(String, String)],
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Page<'arena>, PyReadError> {
+ timing::reset();
+ let _total = TSpan::new(TF::ReadPageTotal);
+
+ // Reset the harvest accumulator so multiple `read_page` calls
+ // sharing a `PyRefs` don't leak prior state into this page.
+ *refs.harvest.borrow_mut() = HarvestState::default();
+
+ let root_ir = read_component(py, root, arena, refs)?;
+ let root_alloc: &Component<'arena> = arena.alloc(root_ir);
+
+ let meta_arr: Vec<Meta<'arena>> = meta_tags
+ .iter()
+ .map(|(name, content)| Meta {
+ name: intern(name),
+ content: arena.alloc_str(content),
+ })
+ .collect();
+ let meta_slice = arena.alloc_slice_fill_iter(meta_arr.into_iter());
+
+ let route_str: &str = arena.alloc_str(route);
+ let title_str: Option<&str> = title.map(|s| &*arena.alloc_str(s));
+
+ // Drain the harvests collected during the single walk above.
+ let harvest = refs.harvest.borrow();
+ let component_imports = arena
+ .alloc_slice_fill_iter(harvest.component_imports.iter().copied());
+ let state_bindings = arena
+ .alloc_slice_fill_iter(harvest.state_bindings.iter().copied());
+ let needs_ref = harvest.needs_ref;
+ drop(harvest);
+
+ Ok(Page {
+ schema_version: SCHEMA_VERSION,
+ route: route_str,
+ root: root_alloc,
+ title: title_str,
+ meta: meta_slice,
+ source_files: arena.alloc_slice_fill_iter(std::iter::empty::<PyFileId>()),
+ component_imports,
+ state_bindings,
+ needs_ref,
+ })
+}
+
+// ---- Component dispatch -----------------------------------------------------
+
+fn read_component<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ timing::incr(TC::Node);
+ let cls_name = {
+ let _s = TSpan::new(TF::ClassName);
+ class_name(component)?
+ };
+ match cls_name.as_str() {
+ "Bare" => read_bare(py, component, arena, refs),
+ "Fragment" => read_fragment(py, component, arena, refs),
+ "Cond" => read_cond(py, component, arena, refs),
+ "Foreach" => read_foreach(py, component, arena, refs),
+ "Match" => read_match(py, component, arena, refs),
+ _ => read_element(py, component, arena, refs),
+ }
+}
+
+fn read_bare<'arena, 'py>(
+ _py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ let contents = getattr(component, "contents")?;
+ if contents.is_none() {
+ return Ok(Component::Text {
+ value: arena.alloc_str(""),
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ }
+ let is_var = isinstance(&contents, &refs.var_cls, "Bare.contents")?;
+ if is_var {
+ let js_expr = read_attr_str(&contents, "_js_expr", "Var._js_expr")?;
+ if let Some(decoded) = decode_js_string_literal(&js_expr) {
+ return Ok(Component::Text {
+ value: arena.alloc_str(&decoded),
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ }
+ // Var-as-expression: emit `Component::Expr` with the JS expression
+ // and its merged VarData. Codegen renders this inline.
+ refs.harvest.borrow_mut().add_state_idents_in(&js_expr);
+ let var_data = read_var_data(&contents, arena, refs)?;
+ let value = Value::JsExpr {
+ expr: arena.alloc_str(&js_expr),
+ var_data,
+ };
+ return Ok(Component::Expr {
+ value,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ }
+ // Non-Var contents: stringify via Python's `str(...)`.
+ let text = py_str(&contents)?;
+ Ok(Component::Text {
+ value: arena.alloc_str(&text),
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ })
+}
+
+fn read_fragment<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ let children = read_children(py, component, arena, refs)?;
+ Ok(Component::Fragment {
+ children,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ })
+}
+
+fn read_cond<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ let cond_obj = getattr(component, "cond")?;
+ let test = read_value(py, &cond_obj, arena, refs)?;
+
+ let children_obj = getattr(component, "children")?;
+ let children: Bound<'_, PyList> = children_obj.downcast_into().map_err(|e| {
+ PyReadError::TypeMismatch {
+ attr: "Cond.children",
+ expected: "list",
+ got: e.to_string(),
+ }
+ })?;
+ let mut iter = children.iter();
+ let then_obj = iter.next();
+ let else_obj = iter.next();
+
+ let then_ir = match then_obj {
+ Some(t) => read_component(py, &t, arena, refs)?,
+ None => Component::Text {
+ value: arena.alloc_str(""),
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ },
+ };
+ let then_alloc: &Component<'arena> = arena.alloc(then_ir);
+
+ let else_alloc: Option<&Component<'arena>> = match else_obj {
+ Some(e) => {
+ let ir = read_component(py, &e, arena, refs)?;
+ Some(arena.alloc(ir))
+ }
+ None => None,
+ };
+
+ Ok(Component::Cond {
+ test,
+ then: then_alloc,
+ else_: else_alloc,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ })
+}
+
+fn read_foreach<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ // Delegate to `_render()` so the iter-var arg is properly typed —
+ // matches the bridge.py rationale (foreach bodies do `item["key"]`
+ // etc. and need `ArrayCastedVar`/`ObjectVar`-shaped args).
+ let iter_tag = component
+ .call_method0("_render")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Foreach._render()",
+ source,
+ })?;
+ let body_component =
+ iter_tag
+ .call_method0("render_component")
+ .map_err(|source| PyReadError::Attr {
+ attr: "IterTag.render_component()",
+ source,
+ })?;
+ let body_ir = read_component(py, &body_component, arena, refs)?;
+ let body_alloc: &Component<'arena> = arena.alloc(body_ir);
+
+ let iterable = getattr(component, "iterable")?;
+ let iter_val = read_value(py, &iterable, arena, refs)?;
+ Ok(Component::Foreach {
+ iter: iter_val,
+ body: body_alloc,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ })
+}
+
+fn read_match<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ let cond_obj = getattr(component, "cond")?;
+ let test = read_value(py, &cond_obj, arena, refs)?;
+
+ let match_cases_obj = match component.getattr("match_cases") {
+ Ok(v) if !v.is_none() => v,
+ _ => {
+ // No cases — emit an empty Match with no default.
+ return Ok(Component::Match {
+ value: test,
+ arms: arena.alloc_slice_fill_iter(std::iter::empty::<MatchArm<'arena>>()),
+ default: None,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ }
+ };
+ let match_cases: Bound<'_, PyList> =
+ match_cases_obj
+ .downcast_into()
+ .map_err(|e| PyReadError::TypeMismatch {
+ attr: "Match.match_cases",
+ expected: "list",
+ got: e.to_string(),
+ })?;
+
+ // Match case entries can arrive as either a list or a tuple
+ // (`[case_a, case_b, ..., body_component]`); use the generic
+ // sequence protocol so both work without a downcast dance.
+ let mut arms_vec: Vec<MatchArm<'arena>> = Vec::with_capacity(match_cases.len());
+ for case_entry in match_cases.iter() {
+ let entries: Vec<Bound<'_, PyAny>> = case_entry
+ .iter()
+ .map_err(|source| PyReadError::Attr {
+ attr: "iter(Match case entry)",
+ source,
+ })?
+ .collect::<Result<Vec<_>, _>>()
+ .map_err(|source| PyReadError::Attr {
+ attr: "Match case entry[i]",
+ source,
+ })?;
+ if entries.len() < 2 {
+ continue;
+ }
+ let body_obj = &entries[entries.len() - 1];
+ let body_ir = read_component(py, body_obj, arena, refs)?;
+ let body_alloc: &Component<'arena> = arena.alloc(body_ir);
+ for case_val_obj in &entries[..entries.len() - 1] {
+ let case = read_value(py, case_val_obj, arena, refs)?;
+ arms_vec.push(MatchArm {
+ case,
+ body: body_alloc,
+ });
+ }
+ }
+
+ let default_obj = component
+ .getattr("default")
+ .ok()
+ .filter(|v| !v.is_none());
+ let default: Option<&Component<'arena>> = match default_obj {
+ Some(d) => {
+ let ir = read_component(py, &d, arena, refs)?;
+ Some(arena.alloc(ir))
+ }
+ None => None,
+ };
+
+ Ok(Component::Match {
+ value: test,
+ arms: arena.alloc_slice_fill_iter(arms_vec.into_iter()),
+ default,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ })
+}
+
+fn read_element<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Component<'arena>, PyReadError> {
+ timing::incr(TC::Element);
+ let tag_sym = {
+ let _s = TSpan::new(TF::ResolveTag);
+ resolve_tag_symbol(component)?
+ };
+
+ // Harvest the component's module/spec for the page-level
+ // `import {...} from "<module>";` lines. Inlined from
+ // `collect_component_imports` so the bridge doesn't have to walk the
+ // tree a second time after IR construction.
+ {
+ let _s = TSpan::new(TF::ImportAlias);
+ if let Some(pair) = import_alias_for(component, refs)? {
+ let _h = TSpan::new(TF::HarvestRegister);
+ refs.harvest.borrow_mut().add_component_import(pair);
+ }
+ }
+
+ // Harvest `needs_ref` while we're already at this node — anything
+ // with a non-None `id` triggers the `const ref_root = useRef(null)`
+ // line in the emitted page module.
+ {
+ let _s = TSpan::new(TF::NeedsRef);
+ if !refs.harvest.borrow().needs_ref {
+ if let Ok(v) = component.getattr("id") {
+ if !v.is_none() {
+ refs.harvest.borrow_mut().mark_needs_ref();
+ }
+ }
+ }
+ }
+
+ // No tag → emit as Fragment around children (matches bridge.py).
+ if tag_sym == Symbol::EMPTY {
+ let children = read_children(py, component, arena, refs)?;
+ return Ok(Component::Fragment {
+ children,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ });
+ }
+
+ // No spans around read_props / read_children / read_event_handlers —
+ // they recurse (props value → nested vars/components, children →
+ // read_component, event_handlers → event_handler_to_js → read_var_data)
+ // so wrapping them would double-count nested work in their own
+ // accumulators. The leaf spans inside (`ReadVarData`, `ResolveTag`,
+ // `ImportAlias`, etc.) report self-time accurately; everything not
+ // covered shows up in the `(unaccounted)` line of the reporter.
+ let props = read_props(py, component, arena, refs)?;
+ let children = read_children(py, component, arena, refs)?;
+ let events = read_event_handlers(py, component, arena, refs)?;
+ let hooks: &[Hook<'arena>] =
+ arena.alloc_slice_fill_iter(std::iter::empty::<Hook<'arena>>());
+ Ok(Component::Element {
+ tag: tag_sym,
+ props,
+ children,
+ event_handlers: events,
+ hooks,
+ id: NodeId::default(),
+ source_loc: SourceLoc::SYNTHETIC,
+ })
+}
+
+// ---- Props, children, events ------------------------------------------------
+
+fn read_children<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<&'arena [Component<'arena>], PyReadError> {
+ let (children_obj, iter) = {
+ let _s = TSpan::new(TF::ChildrenAttr);
+ let children_obj = match component.getattr("children") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(arena.alloc_slice_fill_iter(std::iter::empty::<Component<'arena>>())),
+ };
+ let iter = children_obj.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(component.children)",
+ source,
+ })?;
+ (children_obj, iter)
+ };
+ let _ = children_obj;
+ let mut out: Vec<Component<'arena>> = Vec::new();
+ for item in iter {
+ let child = item.map_err(|source| PyReadError::Attr {
+ attr: "component.children[i]",
+ source,
+ })?;
+ out.push(read_component(py, &child, arena, refs)?);
+ }
+ Ok(arena.alloc_slice_fill_iter(out.into_iter()))
+}
+
+fn read_props<'arena, 'py>(
+ py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<&'arena [(Symbol, Value<'arena>)], PyReadError> {
+ let mut props: Vec<(Symbol, Value<'arena>)> = Vec::new();
+
+ // Component fields (the dataclass props), in Component.get_props() order.
+ let prop_names_obj = {
+ let _s = TSpan::new(TF::GetPropsCall);
+ component
+ .call_method0("get_props")
+ .map_err(|source| PyReadError::Attr {
+ attr: "Component.get_props()",
+ source,
+ })?
+ };
+ let prop_names_iter = prop_names_obj.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(get_props())",
+ source,
+ })?;
+ for name_res in prop_names_iter {
+ timing::incr(TC::Prop);
+ let name_obj = name_res.map_err(|source| PyReadError::Attr {
+ attr: "get_props()[i]",
+ source,
+ })?;
+ let raw: String = py_str(&name_obj)?;
+ let attr_name = raw.strip_suffix('_').unwrap_or(&raw).to_owned();
+ let value_obj = {
+ let _s = TSpan::new(TF::PropValueGetattr);
+ match component.getattr(raw.as_str()) {
+ Ok(v) => v,
+ Err(_) => continue,
+ }
+ };
+ if value_obj.is_none() {
+ continue;
+ }
+ let value = read_value(py, &value_obj, arena, refs)?;
+ props.push((intern(&attr_name), value));
+ }
+
+ // Identity props the legacy renderer always splices.
+ for name in ["key", "id", "class_name"] {
+ let v = {
+ let _s = TSpan::new(TF::PropValueGetattr);
+ match component.getattr(name) {
+ Ok(v) if !v.is_none() => v,
+ _ => continue,
+ }
+ };
+ let value = read_value(py, &v, arena, refs)?;
+ props.push((intern(name), value));
+ }
+
+ // custom_attrs: any extra string-keyed attributes.
+ if let Ok(custom) = component.getattr("custom_attrs") {
+ if !custom.is_none() {
+ if let Ok(mapping) = custom.downcast::<PyMapping>() {
+ let keys = mapping
+ .keys()
+ .map_err(|source| PyReadError::Attr {
+ attr: "custom_attrs.keys()",
+ source,
+ })?;
+ for key_res in keys.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(custom_attrs.keys())",
+ source,
+ })? {
+ let key = key_res.map_err(|source| PyReadError::Attr {
+ attr: "custom_attrs.keys()[i]",
+ source,
+ })?;
+ let name: String = py_str(&key)?;
+ let val =
+ mapping
+ .get_item(&key)
+ .map_err(|source| PyReadError::Attr {
+ attr: "custom_attrs[k]",
+ source,
+ })?;
+ let value = read_value(py, &val, arena, refs)?;
+ props.push((intern(&name), value));
+ }
+ }
+ }
+ }
+
+ Ok(arena.alloc_slice_fill_iter(props.into_iter()))
+}
+
+fn read_event_handlers<'arena, 'py>(
+ _py: Python<'py>,
+ component: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<&'arena [EventHandler<'arena>], PyReadError> {
+ let triggers = {
+ let _s = TSpan::new(TF::EventTriggersAttr);
+ let triggers_obj = match component.getattr("event_triggers") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(arena.alloc_slice_fill_iter(std::iter::empty::<EventHandler<'arena>>())),
+ };
+ let triggers: Bound<'_, PyDict> = triggers_obj
+ .downcast_into()
+ .map_err(|e| PyReadError::TypeMismatch {
+ attr: "Component.event_triggers",
+ expected: "dict",
+ got: e.to_string(),
+ })?;
+ triggers
+ };
+
+ let mut out: Vec<EventHandler<'arena>> = Vec::with_capacity(triggers.len());
+ for (trigger_obj, handler_obj) in triggers.iter() {
+ timing::incr(TC::EventHandler);
+ let trigger_name: String = py_str(&trigger_obj)?;
+ if trigger_name == "on_mount" || trigger_name == "on_unmount" {
+ // Side-effect triggers handled outside JSX — match bridge.py.
+ continue;
+ }
+ let (expr, var_data) =
+ event_handler_to_js(&handler_obj, arena, refs)?;
+ out.push(EventHandler {
+ trigger: intern(&trigger_name),
+ expr: arena.alloc_str(&expr),
+ var_data,
+ });
+ }
+ Ok(arena.alloc_slice_fill_iter(out.into_iter()))
+}
+
+fn event_handler_to_js<'arena>(
+ handler: &Bound<'_, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'_>,
+) -> Result<(String, VarData<'arena>), PyReadError> {
+ if isinstance(handler, &refs.var_cls, "event handler")? {
+ let expr = read_attr_str(handler, "_js_expr", "Var._js_expr")?;
+ refs.harvest.borrow_mut().add_state_idents_in(&expr);
+ let var_data = read_var_data(handler, arena, refs)?;
+ return Ok((expr, var_data));
+ }
+ // Wrap via `LiteralVar.create(handler)` so EventChain / EventSpec /
+ // dict / list values get a proper JS expression + VarData.
+ let wrapped = refs
+ .literal_var_cls
+ .call_method1("create", (handler,))
+ .map_err(|source| PyReadError::Attr {
+ attr: "LiteralVar.create(event handler)",
+ source,
+ })?;
+ if isinstance(&wrapped, &refs.var_cls, "LiteralVar.create result")? {
+ let expr = read_attr_str(&wrapped, "_js_expr", "Var._js_expr")?;
+ refs.harvest.borrow_mut().add_state_idents_in(&expr);
+ let var_data = read_var_data(&wrapped, arena, refs)?;
+ Ok((expr, var_data))
+ } else {
+ Ok((py_str(&wrapped)?, VarData::EMPTY))
+ }
+}
+
+// ---- Value (Var vs literal) -------------------------------------------------
+
+fn read_value<'arena, 'py>(
+ _py: Python<'py>,
+ value: &Bound<'py, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'py>,
+) -> Result<Value<'arena>, PyReadError> {
+ let is_var = {
+ let _s = TSpan::new(TF::IsInstanceVar);
+ isinstance(value, &refs.var_cls, "prop value")?
+ };
+ if is_var {
+ timing::incr(TC::Var);
+ let expr = {
+ let _s = TSpan::new(TF::VarJsExprAttr);
+ read_attr_str(value, "_js_expr", "Var._js_expr")?
+ };
+ refs.harvest.borrow_mut().add_state_idents_in(&expr);
+ let var_data = read_var_data(value, arena, refs)?;
+ return Ok(Value::JsExpr {
+ expr: arena.alloc_str(&expr),
+ var_data,
+ });
+ }
+ let _s_lit = TSpan::new(TF::ValueLiteralDispatch);
+ if value.is_none() {
+ return Ok(Value::Literal(Literal::Null));
+ }
+ if let Ok(b) = value.downcast::<PyBool>() {
+ return Ok(Value::Literal(Literal::Bool(b.is_true())));
+ }
+ if let Ok(i) = value.downcast::<PyInt>() {
+ let n: i64 = i.extract().map_err(|source| PyReadError::Attr {
+ attr: "int.extract()",
+ source,
+ })?;
+ return Ok(Value::Literal(Literal::Int(n)));
+ }
+ if let Ok(f) = value.downcast::<PyFloat>() {
+ let v: f64 = f.extract().map_err(|source| PyReadError::Attr {
+ attr: "float.extract()",
+ source,
+ })?;
+ return Ok(Value::Literal(Literal::Float(v)));
+ }
+ if let Ok(s) = value.downcast::<PyString>() {
+ let raw = s.to_str().map_err(|source| PyReadError::Attr {
+ attr: "PyString::to_str",
+ source,
+ })?;
+ return Ok(Value::Literal(Literal::Str(arena.alloc_str(raw))));
+ }
+ // Complex Python values (EventChain, lists, dicts, …): wrap via
+ // `LiteralVar.create` and read as a Var. Matches bridge.var_to_value.
+ let wrapped = refs
+ .literal_var_cls
+ .call_method1("create", (value,))
+ .map_err(|source| PyReadError::Attr {
+ attr: "LiteralVar.create(prop value)",
+ source,
+ })?;
+ if isinstance(&wrapped, &refs.var_cls, "LiteralVar.create result")? {
+ let expr = read_attr_str(&wrapped, "_js_expr", "Var._js_expr")?;
+ let var_data = read_var_data(&wrapped, arena, refs)?;
+ return Ok(Value::JsExpr {
+ expr: arena.alloc_str(&expr),
+ var_data,
+ });
+ }
+ // Last-ditch: stringify.
+ Ok(Value::JsExpr {
+ expr: arena.alloc_str(&py_str(&wrapped)?),
+ var_data: VarData::EMPTY,
+ })
+}
+
+// ---- VarData ----------------------------------------------------------------
+
+fn read_var_data<'arena>(
+ var: &Bound<'_, PyAny>,
+ arena: &'arena Arena,
+ refs: &PyRefs<'_>,
+) -> Result<VarData<'arena>, PyReadError> {
+ let _s = TSpan::new(TF::ReadVarData);
+ let vd_obj = match var.call_method0("_get_all_var_data") {
+ Ok(v) if !v.is_none() => v,
+ _ => match var.getattr("_var_data") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(VarData::EMPTY),
+ },
+ };
+
+ // hooks: list[str]
+ let hooks: &'arena [&'arena str] = match vd_obj.getattr("hooks") {
+ Ok(v) if !v.is_none() => {
+ let mut out: Vec<&'arena str> = Vec::new();
+ for item in v.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(VarData.hooks)",
+ source,
+ })? {
+ let s = item.map_err(|source| PyReadError::Attr {
+ attr: "VarData.hooks[i]",
+ source,
+ })?;
+ let raw = py_str(&s)?;
+ out.push(arena.alloc_str(&raw));
+ }
+ arena.alloc_slice_fill_iter(out.into_iter())
+ }
+ _ => arena.alloc_slice_fill_iter(std::iter::empty::<&str>()),
+ };
+
+ // imports: ParsedImportTuple or dict[str, list[ImportVar]]
+ let imports = read_var_data_imports(&vd_obj, refs)?;
+ let imports_slice = arena.alloc_slice_fill_iter(imports.into_iter());
+
+ // state: Optional[str]
+ let state = match vd_obj.getattr("state") {
+ Ok(v) if !v.is_none() => Some(intern(&py_str(&v)?)),
+ _ => None,
+ };
+
+ // deps: list[Var | str]
+ let deps: &'arena [Symbol] = match vd_obj.getattr("deps") {
+ Ok(v) if !v.is_none() => {
+ let mut out: Vec<Symbol> = Vec::new();
+ for item in v.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(VarData.deps)",
+ source,
+ })? {
+ let d = item.map_err(|source| PyReadError::Attr {
+ attr: "VarData.deps[i]",
+ source,
+ })?;
+ out.push(intern(&py_str(&d)?));
+ }
+ arena.alloc_slice_fill_iter(out.into_iter())
+ }
+ _ => arena.alloc_slice_fill_iter(std::iter::empty::<Symbol>()),
+ };
+
+ // position: Optional[int | enum-with-value]
+ let position = match vd_obj.getattr("position") {
+ Ok(v) if !v.is_none() => {
+ let p = if let Ok(pi) = v.extract::<u8>() {
+ Some(pi)
+ } else if let Ok(value_attr) = v.getattr("value") {
+ value_attr.extract::<u8>().ok()
+ } else {
+ None
+ };
+ p
+ }
+ _ => None,
+ };
+
+ // components: list[str]
+ let components: &'arena [Symbol] = match vd_obj.getattr("components") {
+ Ok(v) if !v.is_none() => {
+ let mut out: Vec<Symbol> = Vec::new();
+ for item in v.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(VarData.components)",
+ source,
+ })? {
+ let c = item.map_err(|source| PyReadError::Attr {
+ attr: "VarData.components[i]",
+ source,
+ })?;
+ out.push(intern(&py_str(&c)?));
+ }
+ arena.alloc_slice_fill_iter(out.into_iter())
+ }
+ _ => arena.alloc_slice_fill_iter(std::iter::empty::<Symbol>()),
+ };
+
+ Ok(VarData {
+ hooks,
+ imports: imports_slice,
+ state,
+ deps,
+ position,
+ components,
+ })
+}
+
+fn read_var_data_imports(
+ vd: &Bound<'_, PyAny>,
+ refs: &PyRefs<'_>,
+) -> Result<Vec<(Symbol, Symbol)>, PyReadError> {
+ let raw = match vd.getattr("imports") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(Vec::new()),
+ };
+ // `ParsedImportTuple = tuple[tuple[str, tuple[ImportVar, ...]], ...]`,
+ // or `dict[str, list[ImportVar]]`. Iterate either as (module, entries).
+ let mut iter_pairs: Vec<(Bound<'_, PyAny>, Bound<'_, PyAny>)> = Vec::new();
+ if let Ok(d) = raw.downcast::<PyDict>() {
+ for (k, v) in d.iter() {
+ iter_pairs.push((k, v));
+ }
+ } else {
+ for pair in raw.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(VarData.imports)",
+ source,
+ })? {
+ let p = pair.map_err(|source| PyReadError::Attr {
+ attr: "VarData.imports[i]",
+ source,
+ })?;
+ let t: Bound<'_, PyTuple> = p
+ .downcast_into()
+ .map_err(|e| PyReadError::TypeMismatch {
+ attr: "VarData.imports[i]",
+ expected: "tuple",
+ got: e.to_string(),
+ })?;
+ if t.len() != 2 {
+ continue;
+ }
+ iter_pairs.push((
+ t.get_item(0).map_err(|source| PyReadError::Attr {
+ attr: "VarData.imports[i][0]",
+ source,
+ })?,
+ t.get_item(1).map_err(|source| PyReadError::Attr {
+ attr: "VarData.imports[i][1]",
+ source,
+ })?,
+ ));
+ }
+ }
+
+ let mut out: Vec<(Symbol, Symbol)> = Vec::new();
+ for (module_obj, entries) in iter_pairs {
+ let module_raw = py_str(&module_obj)?;
+ let module = format_library_name(refs, &module_raw)?;
+ if module.is_empty() {
+ // Side-effect import; bridge.py skips these for the in-braces list.
+ continue;
+ }
+ for entry in entries.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(imports[module])",
+ source,
+ })? {
+ let e = entry.map_err(|source| PyReadError::Attr {
+ attr: "imports[module][i]",
+ source,
+ })?;
+ let tag = read_import_var_tag(&e)?;
+ if tag.is_empty() {
+ continue;
+ }
+ let tag_root: String = tag.split('.').next().unwrap_or("").to_owned();
+ if !is_js_identifier(&tag_root) {
+ continue;
+ }
+ let module_sym = intern(&module);
+ let tag_sym = intern(&tag_root);
+ out.push((module_sym, tag_sym));
+ // Register at the page level too, matching the old
+ // `vardata_import_pairs` walk. Filter out the React runtime
+ // names that always come from the baseline imports.
+ if !(module == "react"
+ && matches!(tag_root.as_str(), "Fragment" | "useContext" | "useRef"))
+ {
+ refs.harvest
+ .borrow_mut()
+ .add_component_import((module_sym, tag_sym));
+ }
+ }
+ }
+ Ok(out)
+}
+
+fn read_import_var_tag(entry: &Bound<'_, PyAny>) -> Result<String, PyReadError> {
+ let tag = entry.getattr("tag").ok().filter(|v| !v.is_none());
+ if let Some(t) = tag {
+ if let Ok(s) = py_str(&t) {
+ if !s.is_empty() {
+ return Ok(s);
+ }
+ }
+ }
+ let name = entry.getattr("name").ok().filter(|v| !v.is_none());
+ if let Some(n) = name {
+ if let Ok(s) = py_str(&n) {
+ return Ok(s);
+ }
+ }
+ Ok(String::new())
+}
+
+// ---- Page-level harvest walks ----------------------------------------------
+//
+// Kept for reference / future parity testing. These were the three
+// post-IR-build walks `read_page` used to run; they're superseded by
+// the inline harvest registrations in `read_element`, `read_var_data_imports`,
+// `read_value`, and `read_bare` above.
+
+#[allow(dead_code)]
+fn collect_component_imports(
+ py: Python<'_>,
+ root: &Bound<'_, PyAny>,
+ arena: &Arena,
+ refs: &PyRefs<'_>,
+) -> Result<Vec<(Symbol, Symbol)>, PyReadError> {
+ let mut seen: HashSet<(Symbol, Symbol)> = HashSet::new();
+ let mut out: Vec<(Symbol, Symbol)> = Vec::new();
+ let mut push = |pair: (Symbol, Symbol)| {
+ if seen.insert(pair) {
+ out.push(pair);
+ }
+ };
+
+ walk_components(root, &mut |comp| {
+ if let Some(pair) = import_alias_for(comp, refs)? {
+ push(pair);
+ }
+ Ok(())
+ })?;
+
+ // VarData imports — second pass over all Vars in the tree.
+ walk_values(root, refs, &mut |var| {
+ let pairs = vardata_import_pairs(var, refs)?;
+ for p in pairs {
+ push(p);
+ }
+ Ok(())
+ })?;
+ let _ = (py, arena); // unused, kept for future GIL handling
+ Ok(out)
+}
+
+fn import_alias_for(
+ component: &Bound<'_, PyAny>,
+ refs: &PyRefs<'_>,
+) -> Result<Option<(Symbol, Symbol)>, PyReadError> {
+ let library = match component.getattr("library") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(None),
+ };
+ let library_raw = py_str(&library)?;
+ let tag = component.getattr("tag").ok().filter(|v| !v.is_none());
+ let alias = component.getattr("alias").ok().filter(|v| !v.is_none());
+ if tag.is_none() && alias.is_none() {
+ return Ok(None);
+ }
+
+ let module = format_library_name(refs, &library_raw)?;
+ let tag_root = tag
+ .as_ref()
+ .and_then(|t| py_str(t).ok())
+ .map(|s| s.split('.').next().unwrap_or("").to_owned());
+ let alias_root = alias
+ .as_ref()
+ .and_then(|a| py_str(a).ok())
+ .map(|s| s.split('.').next().unwrap_or("").to_owned());
+
+ if module == "react"
+ && matches!(
+ tag_root.as_deref(),
+ Some("Fragment") | Some("useContext") | Some("useRef")
+ )
+ {
+ return Ok(None);
+ }
+
+ let spec = match (&tag_root, &alias_root) {
+ (Some(t), Some(a)) if a != t && !a.is_empty() => format!("{t} as {a}"),
+ (Some(t), _) if !t.is_empty() => t.clone(),
+ (_, Some(a)) if !a.is_empty() => a.clone(),
+ _ => return Ok(None),
+ };
+
+ Ok(Some((intern(&module), intern(&spec))))
+}
+
+#[allow(dead_code)]
+fn vardata_import_pairs(
+ var: &Bound<'_, PyAny>,
+ refs: &PyRefs<'_>,
+) -> Result<Vec<(Symbol, Symbol)>, PyReadError> {
+ let vd = match var.call_method0("_get_all_var_data") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(Vec::new()),
+ };
+ let raw = match vd.getattr("imports") {
+ Ok(v) if !v.is_none() => v,
+ _ => return Ok(Vec::new()),
+ };
+ let mut pairs: Vec<(Bound<'_, PyAny>, Bound<'_, PyAny>)> = Vec::new();
+ if let Ok(d) = raw.downcast::<PyDict>() {
+ for (k, v) in d.iter() {
+ pairs.push((k, v));
+ }
+ } else {
+ for item in raw.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(VarData.imports)",
+ source,
+ })? {
+ let p = item.map_err(|source| PyReadError::Attr {
+ attr: "VarData.imports[i]",
+ source,
+ })?;
+ let t: Bound<'_, PyTuple> = p
+ .downcast_into()
+ .map_err(|e| PyReadError::TypeMismatch {
+ attr: "VarData.imports tuple",
+ expected: "tuple",
+ got: e.to_string(),
+ })?;
+ if t.len() != 2 {
+ continue;
+ }
+ pairs.push((
+ t.get_item(0).map_err(|source| PyReadError::Attr {
+ attr: "VarData.imports[i][0]",
+ source,
+ })?,
+ t.get_item(1).map_err(|source| PyReadError::Attr {
+ attr: "VarData.imports[i][1]",
+ source,
+ })?,
+ ));
+ }
+ }
+ let mut out: Vec<(Symbol, Symbol)> = Vec::new();
+ for (module_obj, entries) in pairs {
+ let module_raw = py_str(&module_obj)?;
+ let module = format_library_name(refs, &module_raw)?;
+ if module.is_empty() {
+ continue;
+ }
+ for entry in entries.iter().map_err(|source| PyReadError::Attr {
+ attr: "iter(imports[module])",
+ source,
+ })? {
+ let e = entry.map_err(|source| PyReadError::Attr {
+ attr: "imports[module][i]",
+ source,
+ })?;
+ let tag = read_import_var_tag(&e)?;
+ if tag.is_empty() {
+ continue;
+ }
+ let root: String = tag.split('.').next().unwrap_or("").to_owned();
+ if !is_js_identifier(&root) {
+ continue;
+ }
+ if module == "react" && matches!(root.as_str(), "Fragment" | "useContext" | "useRef") {
+ continue;
+ }
+ out.push((intern(&module), intern(&root)));
+ }
+ }
+ Ok(out)
+}
+
+#[allow(dead_code)]
+fn collect_state_bindings(
+ _py: Python<'_>,
+ root: &Bound<'_, PyAny>,
+ _arena: &Arena,
+ refs: &PyRefs<'_>,
+) -> Result<Vec<Symbol>, PyReadError> {
+ let mut seen: HashSet<String> = HashSet::new();
+ let mut out: Vec<Symbol> = Vec::new();
+ walk_values(root, refs, &mut |var| {
+ if let Ok(expr) = read_attr_str(var, "_js_expr", "Var._js_expr") {
+ for m in find_state_idents(&expr) {
+ if seen.insert(m.to_owned()) {
+ out.push(intern(&m));
+ }
+ }
+ }
+ Ok(())
+ })?;
+ Ok(out)
+}
+
+/// Find `reflex___state____state__<name>_state` identifiers inside `expr`.
+/// Hand-rolled (avoids pulling regex into the crate); the bridge.py regex
+/// is `\breflex___state____state__[A-Za-z0-9_]+_state\b`.
+fn find_state_idents(expr: &str) -> Vec<String> {
+ const PREFIX: &str = "reflex___state____state__";
+ const SUFFIX: &str = "_state";
+ let mut out: Vec<String> = Vec::new();
+ let bytes = expr.as_bytes();
+ let mut i = 0;
+ while i < bytes.len() {
+ if bytes[i..].starts_with(PREFIX.as_bytes()) {
+ // Boundary check on the left.
+ if i > 0 {
+ let prev = bytes[i - 1];
+ if prev.is_ascii_alphanumeric() || prev == b'_' {
+ i += 1;
+ continue;
+ }
+ }
+ let body_start = i + PREFIX.len();
+ let mut j = body_start;
+ while j < bytes.len() {
+ let c = bytes[j];
+ if c.is_ascii_alphanumeric() || c == b'_' {
+ j += 1;
+ } else {
+ break;
+ }
+ }
+ // Body must end with `_state` and right boundary must be non-word.
+ if j > body_start && bytes[..j].ends_with(SUFFIX.as_bytes()) {
+ let right_ok = j == bytes.len()
+ || !(bytes[j].is_ascii_alphanumeric() || bytes[j] == b'_');
+ if right_ok {
+ out.push(String::from_utf8_lossy(&bytes[i..j]).into_owned());
+ i = j;
+ continue;
+ }
+ }
+ i = body_start;
+ } else {
+ i += 1;
+ }
+ }
+ out
+}
+
+#[allow(dead_code)]
+fn scan_needs_ref(_py: Python<'_>, root: &Bound<'_, PyAny>) -> Result<bool, PyReadError> {
+ let mut found = false;
+ walk_components(root, &mut |comp| {
+ if found {
+ return Ok(());
+ }
+ if let Ok(v) = comp.getattr("id") {
+ if !v.is_none() {
+ found = true;
+ }
+ }
+ Ok(())
+ })?;
+ Ok(found)
+}
+
+// ---- Tree iteration ---------------------------------------------------------
+
+#[allow(dead_code)]
+fn walk_components<F>(root: &Bound<'_, PyAny>, f: &mut F) -> Result<(), PyReadError>
+where
+ F: FnMut(&Bound<'_, PyAny>) -> Result<(), PyReadError>,
+{
+ f(root)?;
+ if let Ok(children) = root.getattr("children") {
+ if !children.is_none() {
+ if let Ok(iter) = children.iter() {
+ for c in iter {
+ let child = c.map_err(|source| PyReadError::Attr {
+ attr: "iter(children)",
+ source,
+ })?;
+ walk_components(&child, f)?;
+ }
+ }
+ }
+ }
+ Ok(())
+}
+
+/// Yield every Var-typed value reachable from `root` (props, identity
+/// props, event handlers, Bare contents). Matches bridge._walk_values.
+#[allow(dead_code)]
+fn walk_values<F>(
+ root: &Bound<'_, PyAny>,
+ refs: &PyRefs<'_>,
+ f: &mut F,
+) -> Result<(), PyReadError>
+where
+ F: FnMut(&Bound<'_, PyAny>) -> Result<(), PyReadError>,
+{
+ walk_components(root, &mut |comp| {
+ if let Ok(prop_names) = comp.call_method0("get_props") {
+ if let Ok(iter) = prop_names.iter() {
+ for name_res in iter {
+ let name_obj = name_res.map_err(|source| PyReadError::Attr {
+ attr: "iter(get_props())",
+ source,
+ })?;
+ let raw: String = py_str(&name_obj)?;
+ let attr_name = raw.strip_suffix('_').unwrap_or(&raw);
+ if let Ok(v) = comp.getattr(attr_name) {
+ if isinstance(&v, &refs.var_cls, "prop value")? {
+ f(&v)?;
+ }
+ }
+ }
+ }
+ }
+ for name in ["key", "id", "class_name"] {
+ if let Ok(v) = comp.getattr(name) {
+ if !v.is_none() && isinstance(&v, &refs.var_cls, "identity prop")? {
+ f(&v)?;
+ }
+ }
+ }
+ if let Ok(triggers) = comp.getattr("event_triggers") {
+ if !triggers.is_none() {
+ if let Ok(d) = triggers.downcast::<PyDict>() {
+ for (_trigger, handler) in d.iter() {
+ if isinstance(&handler, &refs.var_cls, "event handler")? {
+ f(&handler)?;
+ } else if let Ok(wrapped) = refs
+ .literal_var_cls
+ .call_method1("create", (&handler,))
+ {
+ if isinstance(&wrapped, &refs.var_cls, "LiteralVar.create result")? {
+ f(&wrapped)?;
+ }
+ }
+ }
+ }
+ }
+ }
+ if let Ok(contents) = comp.getattr("contents") {
+ if !contents.is_none() && isinstance(&contents, &refs.var_cls, "Bare.contents")? {
+ f(&contents)?;
+ }
+ }
+ Ok(())
+ })
+}
+
+// ---- PyO3 helpers -----------------------------------------------------------
+
+fn getattr<'py>(obj: &Bound<'py, PyAny>, attr: &'static str) -> Result<Bound<'py, PyAny>, PyReadError> {
+ obj.getattr(attr).map_err(|source| PyReadError::Attr {
+ attr,
+ source,
+ })
+}
+
+fn read_attr_str(
+ obj: &Bound<'_, PyAny>,
+ attr: &str,
+ attr_static: &'static str,
+) -> Result<String, PyReadError> {
+ let v = obj.getattr(attr).map_err(|source| PyReadError::Attr {
+ attr: attr_static,
+ source,
+ })?;
+ py_str(&v)
+}
+
+fn isinstance(
+ obj: &Bound<'_, PyAny>,
+ cls: &Bound<'_, PyAny>,
+ attr_static: &'static str,
+) -> Result<bool, PyReadError> {
+ obj.is_instance(cls).map_err(|source| PyReadError::Attr {
+ attr: attr_static,
+ source,
+ })
+}
+
+pub(crate) fn py_str(obj: &Bound<'_, PyAny>) -> Result<String, PyReadError> {
+ let s: Bound<'_, PyString> = obj.str().map_err(|source| PyReadError::Attr {
+ attr: "str(value)",
+ source,
+ })?;
+ s.to_str()
+ .map(|v| v.to_owned())
+ .map_err(|source| PyReadError::Attr {
+ attr: "PyString::to_str",
+ source,
+ })
+}
+
+pub(crate) fn class_name(component: &Bound<'_, PyAny>) -> Result<String, PyReadError> {
+ let ty = component
+ .get_type()
+ .name()
+ .map_err(|source| PyReadError::Attr {
+ attr: "__class__.__name__",
+ source,
+ })?;
+ Ok(ty.to_string())
+}
+
+fn format_library_name(refs: &PyRefs<'_>, library: &str) -> Result<String, PyReadError> {
+ let result = refs
+ .format_library_name
+ .call1((library,))
+ .map_err(|source| PyReadError::Attr {
+ attr: "format_library_name(library)",
+ source,
+ })?;
+ py_str(&result)
+}
+
+/// Resolve the JS tag/component name for a generic Component, returning
+/// the interned symbol. Bare HTML tags (`title`, `meta`) get quoted to
+/// match the legacy emitter (`jsx("title", …)`).
+fn resolve_tag_symbol(component: &Bound<'_, PyAny>) -> Result<Symbol, PyReadError> {
+ let alias = component.getattr("alias").ok().filter(|v| !v.is_none());
+ let tag = component.getattr("tag").ok().filter(|v| !v.is_none());
+ let raw_name = match (&alias, &tag) {
+ (Some(a), _) => py_str(a)?,
+ (None, Some(t)) => py_str(t)?,
+ _ => return Ok(Symbol::EMPTY),
+ };
+ let trimmed = raw_name.trim_matches('"').to_owned();
+ if trimmed.is_empty() {
+ return Ok(Symbol::EMPTY);
+ }
+ let library = component.getattr("library").ok().filter(|v| !v.is_none());
+ let is_global_scope = match component.getattr("_is_tag_in_global_scope") {
+ Ok(v) => v.is_truthy().unwrap_or(false),
+ Err(_) => false,
+ };
+ let final_name = if library.is_none() && is_global_scope {
+ format!("\"{trimmed}\"")
+ } else {
+ trimmed
+ };
+ Ok(intern(&final_name))
+}
+
+fn is_js_identifier(name: &str) -> bool {
+ let mut chars = name.chars();
+ let Some(first) = chars.next() else {
+ return false;
+ };
+ if !(first.is_ascii_alphabetic() || first == '_' || first == '$') {
+ return false;
+ }
+ for c in chars {
+ if !(c.is_ascii_alphanumeric() || c == '_' || c == '$') {
+ return false;
+ }
+ }
+ true
+}
+
+#[cfg(test)]
+mod state_ident_tests {
+ use super::find_state_idents;
+
+ #[test]
+ fn finds_single_state() {
+ let s = find_state_idents("reflex___state____state__counter_state.value");
+ assert_eq!(s, vec!["reflex___state____state__counter_state"]);
+ }
+
+ #[test]
+ fn ignores_partial_prefix() {
+ assert!(find_state_idents("notthestate__counter_state").is_empty());
+ }
+
+ #[test]
+ fn finds_multiple_distinct() {
+ let s = find_state_idents(
+ "reflex___state____state__a_state + reflex___state____state__b_state",
+ );
+ assert_eq!(
+ s,
+ vec![
+ "reflex___state____state__a_state".to_owned(),
+ "reflex___state____state__b_state".to_owned(),
+ ]
+ );
+ }
+
+ #[test]
+ fn requires_state_suffix() {
+ assert!(find_state_idents("reflex___state____state__not_terminated").is_empty());
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/src/text.rs b/packages/reflex-compiler-rust/crates/reflex_pyread/src/text.rs
new file mode 100644
index 00000000000..e8804891791
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/src/text.rs
@@ -0,0 +1,95 @@
+//! Pure-Rust string helpers shared by the reader.
+//!
+//! These live in their own module so they can be unit-tested with
+//! `cargo test -p reflex_pyread --no-default-features` (the pyo3 dep is
+//! optional — see `Cargo.toml` for why).
+
+/// Decode a JS string literal of the form `"..."` to its content. Returns
+/// `None` if `expr` is not a quoted string literal.
+///
+/// Mirrors the `expr.startswith('"') and expr.endswith('"')` branch in
+/// `reflex.compiler.ir.bridge.component_to_ir`: tries strict JSON decoding
+/// first (handles `\uXXXX`, `\n`, `\"`, …), falls back to stripping the
+/// surrounding quotes verbatim on malformed input (matches bridge.py's
+/// `json.JSONDecodeError` recovery).
+pub fn decode_js_string_literal(expr: &str) -> Option<String> {
+ let bytes = expr.as_bytes();
+ if bytes.len() < 2 || bytes[0] != b'"' || bytes[bytes.len() - 1] != b'"' {
+ return None;
+ }
+ Some(decode_json_string(expr).unwrap_or_else(|| expr[1..expr.len() - 1].to_owned()))
+}
+
+/// Decode a `"..."` JSON string. Returns `None` on malformed input so the
+/// caller can fall back to the verbatim slice.
+fn decode_json_string(literal: &str) -> Option<String> {
+ let inner = &literal[1..literal.len() - 1];
+ let mut out = String::with_capacity(inner.len());
+ let mut chars = inner.chars();
+ while let Some(c) = chars.next() {
+ if c != '\\' {
+ out.push(c);
+ continue;
+ }
+ match chars.next()? {
+ '"' => out.push('"'),
+ '\\' => out.push('\\'),
+ '/' => out.push('/'),
+ 'b' => out.push('\u{0008}'),
+ 'f' => out.push('\u{000C}'),
+ 'n' => out.push('\n'),
+ 'r' => out.push('\r'),
+ 't' => out.push('\t'),
+ 'u' => {
+ let mut hex = String::with_capacity(4);
+ for _ in 0..4 {
+ hex.push(chars.next()?);
+ }
+ let code = u32::from_str_radix(&hex, 16).ok()?;
+ let ch = char::from_u32(code)?;
+ out.push(ch);
+ }
+ _ => return None,
+ }
+ }
+ Some(out)
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn json_string_decoded() {
+ assert_eq!(decode_js_string_literal(r#""hello""#).as_deref(), Some("hello"));
+ }
+
+ #[test]
+ fn unicode_minus_decoded() {
+ // `"−"` is the unicode-minus glyph wrapped as a JS literal.
+ assert_eq!(decode_js_string_literal("\"−\"").as_deref(), Some("−"));
+ }
+
+ #[test]
+ fn json_escapes_decoded() {
+ assert_eq!(decode_js_string_literal(r#""a\nb""#).as_deref(), Some("a\nb"));
+ assert_eq!(decode_js_string_literal(r#""é""#).as_deref(), Some("é"));
+ }
+
+ #[test]
+ fn non_literal_returns_none() {
+ assert_eq!(decode_js_string_literal("state.value"), None);
+ assert_eq!(decode_js_string_literal(r#""unterminated"#), None);
+ }
+
+ #[test]
+ fn malformed_escape_falls_back_verbatim() {
+ // `"bad\z"` — quotes at both ends so we attempt to decode, but
+ // `\z` isn't a valid JSON escape → decoder returns `None` → the
+ // outer helper falls back to the verbatim inner slice.
+ assert_eq!(
+ decode_js_string_literal(r#""bad\z""#).as_deref(),
+ Some("bad\\z"),
+ );
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_pyread/src/timing.rs b/packages/reflex-compiler-rust/crates/reflex_pyread/src/timing.rs
new file mode 100644
index 00000000000..7937b8658ea
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_pyread/src/timing.rs
@@ -0,0 +1,191 @@
+//! Thread-local timing accumulator for diagnosing where the Rust read +
+//! emit path spends its budget. Instrumented sections record into a
+//! `RefCell<PhaseTimings>` cell; Python reads them through
+//! `CompilerSession.last_phase_timings_ns()` between compiles.
+//!
+//! Each `Instant::now()` call is ~30 ns on Linux x86_64, so even a
+//! 350-node tree only burns ~10 µs of measurement overhead — well
+//! within signal range for a ~2 ms compile.
+//!
+//! Counters reset on every fresh `read_page` call so the values
+//! reported reflect a single page's work.
+
+use std::cell::RefCell;
+use std::time::Instant;
+
+/// Per-phase nanosecond counters. All spans are **leaf** — no nested
+/// recursion is included in any counter, so values sum to roughly
+/// `read_page_total_ns` (modulo loop control flow).
+#[derive(Clone, Copy, Default, Debug)]
+pub struct PhaseTimings {
+ /// `type(component).__name__` dispatch lookup per node.
+ pub class_name_ns: u64,
+ /// `resolve_tag_symbol` — reads alias/tag/library/is_global_scope.
+ pub resolve_tag_ns: u64,
+ /// `import_alias_for` — reads library/tag/alias again (redundant
+ /// with `resolve_tag_symbol`; isolating to confirm the cost).
+ pub import_alias_ns: u64,
+ /// `getattr("id")` check + `mark_needs_ref`.
+ pub needs_ref_ns: u64,
+ /// `read_var_data` — Var._get_all_var_data + imports/hooks/deps decode.
+ pub read_var_data_ns: u64,
+ /// `refs.harvest.borrow_mut()` registrations (RefCell overhead).
+ pub harvest_register_ns: u64,
+ /// Pure-Rust JSX emit from IR (`emit_page_with_extras`).
+ pub emit_ns: u64,
+ /// `read_page` total, end-to-end.
+ pub read_page_total_ns: u64,
+
+ // ---- Finer-grained leaf spans, added to pin down per-element cost.
+ /// `component.call_method0("get_props")` itself (per element).
+ pub get_props_call_ns: u64,
+ /// Per-prop `getattr(prop_name)` — reading each declared prop's value.
+ pub prop_value_getattr_ns: u64,
+ /// Per-element `getattr("children")` + initial `iter()` setup.
+ pub children_attr_ns: u64,
+ /// Per-element `getattr("event_triggers")` + dict downcast.
+ pub event_triggers_attr_ns: u64,
+ /// `isinstance(value, var_cls)` checks in `read_value`.
+ pub isinstance_var_ns: u64,
+ /// `read_value` non-Var dispatch (literal type probing).
+ pub value_literal_dispatch_ns: u64,
+ /// `read_attr_str(var, "_js_expr", ...)` for Var values.
+ pub var_js_expr_attr_ns: u64,
+
+ // ---- Counts so we can derive per-call costs.
+ pub node_count: u64,
+ pub element_count: u64,
+ pub var_count: u64,
+ pub prop_count: u64,
+ pub event_handler_count: u64,
+}
+
+thread_local! {
+ pub static TIMINGS: RefCell<PhaseTimings> = const { RefCell::new(PhaseTimings {
+ class_name_ns: 0,
+ resolve_tag_ns: 0,
+ import_alias_ns: 0,
+ needs_ref_ns: 0,
+ read_var_data_ns: 0,
+ harvest_register_ns: 0,
+ emit_ns: 0,
+ read_page_total_ns: 0,
+ get_props_call_ns: 0,
+ prop_value_getattr_ns: 0,
+ children_attr_ns: 0,
+ event_triggers_attr_ns: 0,
+ isinstance_var_ns: 0,
+ value_literal_dispatch_ns: 0,
+ var_js_expr_attr_ns: 0,
+ node_count: 0,
+ element_count: 0,
+ var_count: 0,
+ prop_count: 0,
+ event_handler_count: 0,
+ }) };
+}
+
+/// Reset all counters to zero. Call at the start of each compile so
+/// reported values reflect the single page just compiled.
+pub fn reset() {
+ TIMINGS.with(|cell| *cell.borrow_mut() = PhaseTimings::default());
+}
+
+/// Snapshot the current counters.
+pub fn snapshot() -> PhaseTimings {
+ TIMINGS.with(|cell| *cell.borrow())
+}
+
+/// Add `elapsed` to the counter selected by `field`.
+#[inline]
+pub fn add(field: Field, elapsed_ns: u64) {
+ TIMINGS.with(|cell| {
+ let mut t = cell.borrow_mut();
+ match field {
+ Field::ClassName => t.class_name_ns += elapsed_ns,
+ Field::ResolveTag => t.resolve_tag_ns += elapsed_ns,
+ Field::ImportAlias => t.import_alias_ns += elapsed_ns,
+ Field::NeedsRef => t.needs_ref_ns += elapsed_ns,
+ Field::ReadVarData => t.read_var_data_ns += elapsed_ns,
+ Field::HarvestRegister => t.harvest_register_ns += elapsed_ns,
+ Field::Emit => t.emit_ns += elapsed_ns,
+ Field::ReadPageTotal => t.read_page_total_ns += elapsed_ns,
+ Field::GetPropsCall => t.get_props_call_ns += elapsed_ns,
+ Field::PropValueGetattr => t.prop_value_getattr_ns += elapsed_ns,
+ Field::ChildrenAttr => t.children_attr_ns += elapsed_ns,
+ Field::EventTriggersAttr => t.event_triggers_attr_ns += elapsed_ns,
+ Field::IsInstanceVar => t.isinstance_var_ns += elapsed_ns,
+ Field::ValueLiteralDispatch => t.value_literal_dispatch_ns += elapsed_ns,
+ Field::VarJsExprAttr => t.var_js_expr_attr_ns += elapsed_ns,
+ }
+ });
+}
+
+/// Bump a count counter by 1.
+#[inline]
+pub fn incr(counter: Counter) {
+ TIMINGS.with(|cell| {
+ let mut t = cell.borrow_mut();
+ match counter {
+ Counter::Node => t.node_count += 1,
+ Counter::Element => t.element_count += 1,
+ Counter::Var => t.var_count += 1,
+ Counter::Prop => t.prop_count += 1,
+ Counter::EventHandler => t.event_handler_count += 1,
+ }
+ });
+}
+
+#[derive(Clone, Copy)]
+pub enum Field {
+ ClassName,
+ ResolveTag,
+ ImportAlias,
+ NeedsRef,
+ ReadVarData,
+ HarvestRegister,
+ Emit,
+ ReadPageTotal,
+ GetPropsCall,
+ PropValueGetattr,
+ ChildrenAttr,
+ EventTriggersAttr,
+ IsInstanceVar,
+ ValueLiteralDispatch,
+ VarJsExprAttr,
+}
+
+#[derive(Clone, Copy)]
+pub enum Counter {
+ Node,
+ Element,
+ Var,
+ Prop,
+ EventHandler,
+}
+
+/// RAII guard that adds the elapsed time to `field` when dropped.
+/// Cheaper to type than `let t = Instant::now(); …; add(field, …)` at
+/// every site.
+pub struct Span {
+ start: Instant,
+ field: Field,
+}
+
+impl Span {
+ #[inline]
+ pub fn new(field: Field) -> Self {
+ Self {
+ start: Instant::now(),
+ field,
+ }
+ }
+}
+
+impl Drop for Span {
+ #[inline]
+ fn drop(&mut self) {
+ let ns = self.start.elapsed().as_nanos() as u64;
+ add(self.field, ns);
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_semantic/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_semantic/Cargo.toml
new file mode 100644
index 00000000000..d2edaa4d49f
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_semantic/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "reflex_semantic"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+reflex_ir = { workspace = true }
+reflex_intern = { workspace = true }
+
+[dev-dependencies]
+reflex_arena = { workspace = true }
diff --git a/packages/reflex-compiler-rust/crates/reflex_semantic/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_semantic/src/lib.rs
new file mode 100644
index 00000000000..dcc5364c2dc
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_semantic/src/lib.rs
@@ -0,0 +1,136 @@
+//! Six aggregator walks over IR. See plan §3 / D7.
+//!
+//! The current Python compiler runs six independent tree walks
+//! (`_get_all_hooks`, `_get_all_imports`, `_get_all_dynamic_imports`,
+//! `_get_all_custom_code`, `_get_all_refs`, `_get_all_hooks_internal`). The
+//! Rust port collapses them into a **single walk** that fills all six
+//! collectors simultaneously — there's no good reason to walk the same tree
+//! six times. Output is deduped while preserving first-seen order.
+//!
+//! Three of the six (`dynamic_imports`, `custom_code`, `refs`) depend on IR
+//! fields that the §4 v1 schema doesn't carry explicitly. They're plumbed as
+//! collectors today and return empty (or partial) sets — adding the schema
+//! fields is a v2 task and the public API doesn't change.
+
+#![forbid(unsafe_code)]
+
+use reflex_intern::Symbol;
+use reflex_ir::{Component, IrVisitor, Page, Value, VarData};
+
+/// Result of one full aggregator walk. Each collection is deduped.
+#[derive(Default, Debug)]
+pub struct Aggregated<'a> {
+ /// Hook fragments hoisted to the top of the render function. Includes
+ /// `Hook.code` from each Element (position > 0) and `VarData.hooks` from
+ /// each `Value`.
+ pub hooks: Vec<&'a str>,
+ /// `(module, name)` imports required by any rendered expression.
+ pub imports: Vec<(Symbol, Symbol)>,
+ /// Dynamic imports — schema-v2 placeholder.
+ pub dynamic_imports: Vec<Symbol>,
+ /// Custom JS code blocks — schema-v2 placeholder.
+ pub custom_code: Vec<&'a str>,
+ /// Component refs (`React.useRef`) — schema-v2 placeholder, surfaces
+ /// `Value::Ref` symbols for now.
+ pub refs: Vec<Symbol>,
+ /// Hooks tagged as "internal" (Hook.position == 0). Distinct from `hooks`
+ /// because the renderer ordering differs (state/theme hooks come first).
+ pub internal_hooks: Vec<&'a str>,
+}
+
+impl<'a> Aggregated<'a> {
+ pub fn new() -> Self {
+ Self::default()
+ }
+
+ fn add_hook(&mut self, code: &'a str, position: u8) {
+ let target = if position == 0 {
+ &mut self.internal_hooks
+ } else {
+ &mut self.hooks
+ };
+ if !target.iter().any(|s| *s == code) {
+ target.push(code);
+ }
+ }
+
+ fn add_var_hook(&mut self, code: &'a str) {
+ if !self.hooks.iter().any(|s| *s == code) {
+ self.hooks.push(code);
+ }
+ }
+
+ fn add_import(&mut self, module: Symbol, name: Symbol) {
+ if !self.imports.iter().any(|p| *p == (module, name)) {
+ self.imports.push((module, name));
+ }
+ }
+
+ fn add_ref(&mut self, sym: Symbol) {
+ if !self.refs.contains(&sym) {
+ self.refs.push(sym);
+ }
+ }
+}
+
+/// Run all six aggregator walks in one pass over `page`. The returned
+/// `Aggregated<'a>` borrows from the same arena `page` borrows from.
+pub fn aggregate<'a>(page: &Page<'a>) -> Aggregated<'a> {
+ let mut agg = Aggregated::new();
+ let mut visitor = AggregateVisitor { agg: &mut agg };
+ visitor.visit_page(page);
+ agg
+}
+
+struct AggregateVisitor<'r, 'a> {
+ agg: &'r mut Aggregated<'a>,
+}
+
+impl<'r, 'a> IrVisitor<'a> for AggregateVisitor<'r, 'a> {
+ #[inline]
+ fn visit_var_data(&mut self, vd: &VarData<'a>) {
+ for hook in vd.hooks {
+ self.agg.add_var_hook(hook);
+ }
+ for (m, n) in vd.imports {
+ self.agg.add_import(*m, *n);
+ }
+ }
+
+ #[inline]
+ fn visit_component(&mut self, component: &Component<'a>) {
+ if let Component::Element { hooks, .. } = component {
+ for h in *hooks {
+ self.agg.add_hook(h.code, h.position);
+ }
+ }
+ reflex_ir::walk_component(self, component);
+ }
+
+ #[inline]
+ fn visit_value(&mut self, v: &Value<'a>) {
+ if let Value::Ref(sym) = v {
+ self.agg.add_ref(*sym);
+ }
+ reflex_ir::walk_value(self, v);
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use reflex_arena::Arena;
+ use reflex_ir::parse::test_helpers::tiny_page_bytes;
+ use reflex_ir::parse_page;
+
+ #[test]
+ fn empty_page_has_no_aggregates() {
+ let arena = Arena::new();
+ let bytes = tiny_page_bytes();
+ let page = parse_page(&arena, &bytes).unwrap();
+ let agg = aggregate(&page);
+ assert!(agg.hooks.is_empty());
+ assert!(agg.imports.is_empty());
+ assert!(agg.refs.is_empty());
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_vars/Cargo.toml b/packages/reflex-compiler-rust/crates/reflex_vars/Cargo.toml
new file mode 100644
index 00000000000..c364f93975e
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_vars/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "reflex_vars"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[lib]
+path = "src/lib.rs"
+
+[dependencies]
diff --git a/packages/reflex-compiler-rust/crates/reflex_vars/src/lib.rs b/packages/reflex-compiler-rust/crates/reflex_vars/src/lib.rs
new file mode 100644
index 00000000000..3971f0be030
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_vars/src/lib.rs
@@ -0,0 +1,23 @@
+//! Rust port of `packages/reflex-base/src/reflex_base/vars/` — see plan §0b.
+//!
+//! This iteration ships the pure-Rust data model only: `Var`, `VarData`,
+//! `ImportVar`, `HookPosition`, and `VarData::merge`. No PyO3 bindings yet —
+//! those land in the next iteration once the data shape is reviewed.
+//!
+//! The semantics here mirror the Python `dataclass`-based originals:
+//!
+//! * `VarData` is *frozen* (immutable after construction) and hash-equal so it
+//! can be stored in sets/dicts on the Python side.
+//! * `VarData::merge` flattens a chain of `Option<&VarData>` into a single
+//! merged `Option<VarData>`, preserving first-seen ordering of hooks/imports
+//! and union-ing the rest. The Python implementation lives at
+//! `packages/reflex-base/src/reflex_base/vars/base.py:200-270`.
+//! * `Var` carries the final `_js_expr` string + optional `VarData`. The
+//! typed-expression hierarchy (`NumberVar`, `StringVar`, …) lands in
+//! follow-up iterations.
+
+mod var;
+mod var_data;
+
+pub use var::Var;
+pub use var_data::{HookPosition, ImportVar, VarData};
diff --git a/packages/reflex-compiler-rust/crates/reflex_vars/src/var.rs b/packages/reflex-compiler-rust/crates/reflex_vars/src/var.rs
new file mode 100644
index 00000000000..5e632baa2f5
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_vars/src/var.rs
@@ -0,0 +1,120 @@
+//! The `Var` base struct — final JS expression string + optional `VarData`.
+//!
+//! Mirrors the data shape of `Var` at
+//! `packages/reflex-base/src/reflex_base/vars/base.py:400-525`. The full typed
+//! hierarchy (`NumberVar`, `StringVar`, …) and operator overloads land in
+//! follow-up iterations once the PyO3 boundary is wired up.
+
+use crate::var_data::VarData;
+
+/// A finalized JS expression plus its metadata.
+///
+/// On the Python side this carries a generic `VAR_TYPE` parameter that
+/// participates in type narrowing. The Rust port keeps the type information
+/// out for now — the typed hierarchy will be modeled as an enum tag in a
+/// follow-up. `js_expr` is the canonical JS source that lands in emitted JSX.
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct Var {
+ js_expr: String,
+ var_data: Option<VarData>,
+}
+
+impl Var {
+ /// Construct a `Var` with the given JS expression and no metadata.
+ pub fn new(js_expr: impl Into<String>) -> Self {
+ Self {
+ js_expr: js_expr.into(),
+ var_data: None,
+ }
+ }
+
+ /// Construct a `Var` with the given JS expression and metadata.
+ pub fn with_data(js_expr: impl Into<String>, var_data: VarData) -> Self {
+ let var_data = if var_data.is_empty() {
+ None
+ } else {
+ Some(var_data)
+ };
+ Self {
+ js_expr: js_expr.into(),
+ var_data,
+ }
+ }
+
+ /// The literal JS source the codegen splices into the emitted module.
+ pub fn js_expr(&self) -> &str {
+ &self.js_expr
+ }
+
+ /// Metadata, if any — `None` for unmetered literal vars.
+ pub fn var_data(&self) -> Option<&VarData> {
+ self.var_data.as_ref()
+ }
+
+ /// Replace the `VarData` on this `Var`, returning a new value.
+ ///
+ /// The replacement is dropped to `None` when empty so two structurally
+ /// equal Vars with empty metadata compare equal regardless of how they
+ /// were constructed.
+ pub fn with_var_data(mut self, var_data: VarData) -> Self {
+ self.var_data = if var_data.is_empty() {
+ None
+ } else {
+ Some(var_data)
+ };
+ self
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn new_var_has_no_data() {
+ let v = Var::new("1 + 2");
+ assert_eq!(v.js_expr(), "1 + 2");
+ assert!(v.var_data().is_none());
+ }
+
+ #[test]
+ fn with_data_keeps_data() {
+ let data = VarData {
+ state: "S".into(),
+ ..VarData::default()
+ };
+ let v = Var::with_data("getS().count", data.clone());
+ assert_eq!(v.js_expr(), "getS().count");
+ assert_eq!(v.var_data(), Some(&data));
+ }
+
+ #[test]
+ fn with_data_drops_empty_var_data() {
+ let v = Var::with_data("1", VarData::empty());
+ assert!(v.var_data().is_none());
+ }
+
+ #[test]
+ fn equality_includes_data() {
+ let a = Var::new("x");
+ let b = Var::new("x");
+ let c = Var::with_data(
+ "x",
+ VarData {
+ state: "S".into(),
+ ..VarData::default()
+ },
+ );
+ assert_eq!(a, b);
+ assert_ne!(a, c);
+ }
+
+ #[test]
+ fn vars_are_hashable() {
+ let a = Var::new("x");
+ let b = Var::new("x");
+ let mut set = std::collections::HashSet::new();
+ set.insert(a);
+ assert!(set.contains(&b));
+ }
+}
diff --git a/packages/reflex-compiler-rust/crates/reflex_vars/src/var_data.rs b/packages/reflex-compiler-rust/crates/reflex_vars/src/var_data.rs
new file mode 100644
index 00000000000..ee74399198b
--- /dev/null
+++ b/packages/reflex-compiler-rust/crates/reflex_vars/src/var_data.rs
@@ -0,0 +1,411 @@
+//! `VarData`, `ImportVar`, `HookPosition` — the metadata that travels with
+//! every `Var`. Mirrors the Python dataclasses in
+//! `packages/reflex-base/src/reflex_base/vars/base.py` and
+//! `packages/reflex-base/src/reflex_base/utils/imports.py`.
+
+use std::sync::Arc;
+
+use crate::var::Var;
+
+/// Where in the emitted component body a hook is allowed to live.
+///
+/// Matches `Hooks.HookPosition` at
+/// `packages/reflex-base/src/reflex_base/constants/compiler.py:166`.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum HookPosition {
+ Internal,
+ PreTrigger,
+ PostTrigger,
+}
+
+impl HookPosition {
+ /// The wire-format string used by the Python side (`Enum.value`).
+ pub fn as_str(self) -> &'static str {
+ match self {
+ HookPosition::Internal => "internal",
+ HookPosition::PreTrigger => "pre_trigger",
+ HookPosition::PostTrigger => "post_trigger",
+ }
+ }
+}
+
+/// A single named import from a JS module.
+///
+/// Mirrors `ImportVar` at
+/// `packages/reflex-base/src/reflex_base/utils/imports.py:106-141`.
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct ImportVar {
+ pub tag: Option<String>,
+ pub is_default: bool,
+ pub alias: Option<String>,
+ pub install: bool,
+ pub render: bool,
+ pub package_path: String,
+}
+
+impl ImportVar {
+ pub fn new(tag: impl Into<String>) -> Self {
+ Self {
+ tag: Some(tag.into()),
+ is_default: false,
+ alias: None,
+ install: true,
+ render: true,
+ package_path: "/".to_owned(),
+ }
+ }
+
+ /// The display name used in the emitted `import { name } from "lib"` line.
+ ///
+ /// Matches `ImportVar.name` at `imports.py:128-141`.
+ pub fn name(&self) -> String {
+ match (&self.alias, &self.tag) {
+ (Some(alias), Some(tag)) => {
+ if self.is_default && tag != "*" {
+ alias.clone()
+ } else {
+ format!("{tag} as {alias}")
+ }
+ }
+ (Some(alias), None) => alias.clone(),
+ (None, Some(tag)) => tag.clone(),
+ (None, None) => String::new(),
+ }
+ }
+}
+
+/// Metadata associated with a `Var` — imports it pulls in, hooks it needs, the
+/// enclosing state, and so on. **Frozen / value-typed:** every mutation
+/// produces a new `VarData`.
+///
+/// Mirrors `VarData` at `vars/base.py:116-322`.
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Default)]
+pub struct VarData {
+ pub state: String,
+ pub field_name: String,
+ /// Ordered list of `(module, imports)` pairs — preserves first-seen order
+ /// per the `ParsedImportTuple` shape on the Python side.
+ pub imports: Vec<(String, Vec<ImportVar>)>,
+ /// Ordered list of hook source lines, deduplicated by first occurrence.
+ pub hooks: Vec<String>,
+ /// `Arc` so cloning `VarData` is cheap even when many Vars share deps.
+ pub deps: Vec<Arc<Var>>,
+ pub position: Option<HookPosition>,
+ /// Placeholder until `reflex_component` lands. Stored as opaque identifier
+ /// strings (the Component's `id` / class name) so `VarData` keeps its
+ /// `Hash`/`Eq` derives.
+ pub components: Vec<String>,
+}
+
+impl VarData {
+ /// True when every field is at its default value — matches `__bool__`
+ /// semantics at `vars/base.py:272-286`.
+ pub fn is_empty(&self) -> bool {
+ self.state.is_empty()
+ && self.field_name.is_empty()
+ && self.imports.is_empty()
+ && self.hooks.is_empty()
+ && self.deps.is_empty()
+ && self.position.is_none()
+ && self.components.is_empty()
+ }
+
+ /// Convenience: the same shape as `VarData::default()` but spelled out so
+ /// callers don't have to import `Default`.
+ pub fn empty() -> Self {
+ Self::default()
+ }
+
+ /// Merge a chain of `VarData` references into a single value.
+ ///
+ /// Semantics match `VarData.merge` at `vars/base.py:200-270`:
+ ///
+ /// * `state` / `field_name` come from the **first** non-empty entry.
+ /// * `hooks` and `imports` are unioned, preserving first-seen order.
+ /// * `deps` and `components` are concatenated in input order.
+ /// * `position` collapses to the single non-`None` position, or `None`
+ /// when there is none. Returns `Err` when two entries disagree.
+ ///
+ /// `None` entries are filtered out. If everything is `None` (or empty
+ /// after filtering), returns `Ok(None)`.
+ pub fn merge<'a, I>(parts: I) -> Result<Option<VarData>, MergeError>
+ where
+ I: IntoIterator<Item = Option<&'a VarData>>,
+ {
+ let parts: Vec<&VarData> = parts.into_iter().flatten().collect();
+
+ if parts.is_empty() {
+ return Ok(None);
+ }
+ if parts.len() == 1 {
+ return Ok(Some(parts[0].clone()));
+ }
+
+ let field_name = parts
+ .iter()
+ .map(|d| d.field_name.as_str())
+ .find(|s| !s.is_empty())
+ .unwrap_or("")
+ .to_owned();
+
+ let state = parts
+ .iter()
+ .map(|d| d.state.as_str())
+ .find(|s| !s.is_empty())
+ .unwrap_or("")
+ .to_owned();
+
+ // Hooks: dedup, preserve first-seen order.
+ let mut hooks: Vec<String> = Vec::new();
+ let mut seen_hooks: std::collections::HashSet<&str> = std::collections::HashSet::new();
+ for d in &parts {
+ for h in &d.hooks {
+ if seen_hooks.insert(h.as_str()) {
+ hooks.push(h.clone());
+ }
+ }
+ }
+
+ // Imports: per-module dedup, preserve first-seen module order. Within
+ // a module, dedup imports by full equality.
+ let mut imports: Vec<(String, Vec<ImportVar>)> = Vec::new();
+ for d in &parts {
+ for (module, vars) in &d.imports {
+ let slot = match imports.iter_mut().find(|(m, _)| m == module) {
+ Some(s) => &mut s.1,
+ None => {
+ imports.push((module.clone(), Vec::new()));
+ &mut imports.last_mut().unwrap().1
+ }
+ };
+ for v in vars {
+ if !slot.contains(v) {
+ slot.push(v.clone());
+ }
+ }
+ }
+ }
+
+ let deps: Vec<Arc<Var>> = parts.iter().flat_map(|d| d.deps.iter().cloned()).collect();
+
+ let mut positions: Vec<HookPosition> = Vec::new();
+ for d in &parts {
+ if let Some(p) = d.position {
+ if !positions.contains(&p) {
+ positions.push(p);
+ }
+ }
+ }
+ let position = match positions.len() {
+ 0 => None,
+ 1 => Some(positions[0]),
+ _ => return Err(MergeError::ConflictingPositions(positions)),
+ };
+
+ let components: Vec<String> = parts
+ .iter()
+ .flat_map(|d| d.components.iter().cloned())
+ .collect();
+
+ Ok(Some(VarData {
+ state,
+ field_name,
+ imports,
+ hooks,
+ deps,
+ position,
+ components,
+ }))
+ }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum MergeError {
+ ConflictingPositions(Vec<HookPosition>),
+}
+
+impl std::fmt::Display for MergeError {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ match self {
+ MergeError::ConflictingPositions(ps) => {
+ write!(f, "cannot merge var data with different positions: {ps:?}")
+ }
+ }
+ }
+}
+
+impl std::error::Error for MergeError {}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ fn import(module: &str, tag: &str) -> (String, Vec<ImportVar>) {
+ (module.to_owned(), vec![ImportVar::new(tag)])
+ }
+
+ #[test]
+ fn import_var_name_default() {
+ let iv = ImportVar {
+ tag: Some("Foo".into()),
+ is_default: true,
+ alias: Some("FooAlias".into()),
+ ..ImportVar::new("Foo")
+ };
+ assert_eq!(iv.name(), "FooAlias");
+ }
+
+ #[test]
+ fn import_var_name_aliased_named() {
+ let iv = ImportVar {
+ tag: Some("Foo".into()),
+ is_default: false,
+ alias: Some("FooAlias".into()),
+ ..ImportVar::new("Foo")
+ };
+ assert_eq!(iv.name(), "Foo as FooAlias");
+ }
+
+ #[test]
+ fn import_var_name_unaliased() {
+ let iv = ImportVar::new("Foo");
+ assert_eq!(iv.name(), "Foo");
+ }
+
+ #[test]
+ fn empty_var_data_is_empty() {
+ assert!(VarData::default().is_empty());
+ assert!(VarData::empty().is_empty());
+ }
+
+ #[test]
+ fn nonempty_var_data_is_not_empty() {
+ let d = VarData {
+ state: "MyState".into(),
+ ..VarData::default()
+ };
+ assert!(!d.is_empty());
+ }
+
+ #[test]
+ fn merge_empty_returns_none() {
+ let result = VarData::merge(std::iter::empty::<Option<&VarData>>()).unwrap();
+ assert!(result.is_none());
+
+ let result = VarData::merge([None, None]).unwrap();
+ assert!(result.is_none());
+ }
+
+ #[test]
+ fn merge_single_returns_clone() {
+ let d = VarData {
+ state: "S".into(),
+ field_name: "f".into(),
+ ..VarData::default()
+ };
+ let merged = VarData::merge([Some(&d)]).unwrap().unwrap();
+ assert_eq!(merged, d);
+ }
+
+ #[test]
+ fn merge_picks_first_nonempty_state_and_field() {
+ let a = VarData::default();
+ let b = VarData {
+ state: "FromB".into(),
+ field_name: "fromB".into(),
+ ..VarData::default()
+ };
+ let c = VarData {
+ state: "FromC".into(),
+ field_name: "fromC".into(),
+ ..VarData::default()
+ };
+ let merged = VarData::merge([Some(&a), Some(&b), Some(&c)])
+ .unwrap()
+ .unwrap();
+ assert_eq!(merged.state, "FromB");
+ assert_eq!(merged.field_name, "fromB");
+ }
+
+ #[test]
+ fn merge_hooks_dedupes_preserving_first_seen() {
+ let a = VarData {
+ hooks: vec!["h1".into(), "h2".into()],
+ ..VarData::default()
+ };
+ let b = VarData {
+ hooks: vec!["h2".into(), "h3".into()],
+ ..VarData::default()
+ };
+ let merged = VarData::merge([Some(&a), Some(&b)]).unwrap().unwrap();
+ assert_eq!(merged.hooks, vec!["h1", "h2", "h3"]);
+ }
+
+ #[test]
+ fn merge_imports_dedupes_per_module() {
+ let a = VarData {
+ imports: vec![import("react", "useState"), import("react", "useEffect")],
+ ..VarData::default()
+ };
+ let b = VarData {
+ imports: vec![import("react", "useState"), import("./foo", "Foo")],
+ ..VarData::default()
+ };
+ let merged = VarData::merge([Some(&a), Some(&b)]).unwrap().unwrap();
+ assert_eq!(merged.imports.len(), 2);
+ let react = &merged.imports[0];
+ assert_eq!(react.0, "react");
+ assert_eq!(react.1.len(), 2);
+ let foo = &merged.imports[1];
+ assert_eq!(foo.0, "./foo");
+ assert_eq!(foo.1.len(), 1);
+ }
+
+ #[test]
+ fn merge_position_unifies_when_compatible() {
+ let a = VarData {
+ position: Some(HookPosition::Internal),
+ ..VarData::default()
+ };
+ let b = VarData {
+ position: None,
+ ..VarData::default()
+ };
+ let c = VarData {
+ position: Some(HookPosition::Internal),
+ ..VarData::default()
+ };
+ let merged = VarData::merge([Some(&a), Some(&b), Some(&c)])
+ .unwrap()
+ .unwrap();
+ assert_eq!(merged.position, Some(HookPosition::Internal));
+ }
+
+ #[test]
+ fn merge_position_errors_on_conflict() {
+ let a = VarData {
+ position: Some(HookPosition::Internal),
+ ..VarData::default()
+ };
+ let b = VarData {
+ position: Some(HookPosition::PreTrigger),
+ ..VarData::default()
+ };
+ let err = VarData::merge([Some(&a), Some(&b)]).unwrap_err();
+ assert!(matches!(err, MergeError::ConflictingPositions(_)));
+ }
+
+ #[test]
+ fn var_data_round_trips_through_hash_set() {
+ // Frozen-dataclass invariant on the Python side: VarData is hashable
+ // and value-equal. The Rust analogue is `#[derive(Hash, Eq)]`.
+ let d = VarData {
+ state: "S".into(),
+ hooks: vec!["h".into()],
+ ..VarData::default()
+ };
+ let mut set = std::collections::HashSet::new();
+ set.insert(d.clone());
+ assert!(set.contains(&d));
+ }
+}
diff --git a/packages/reflex-compiler-rust/pyproject.toml b/packages/reflex-compiler-rust/pyproject.toml
new file mode 100644
index 00000000000..77473b24a28
--- /dev/null
+++ b/packages/reflex-compiler-rust/pyproject.toml
@@ -0,0 +1,27 @@
+[build-system]
+requires = ["maturin>=1.7,<2"]
+build-backend = "maturin"
+
+[project]
+name = "reflex-compiler-rust"
+version = "0.0.0"
+description = "Rust acceleration for the Reflex compiler (PyO3 + maturin). Spike scaffold; not a real release."
+requires-python = ">=3.10"
+license = { text = "Apache-2.0" }
+classifiers = [
+ "Programming Language :: Python :: 3",
+ "Programming Language :: Python :: 3.10",
+ "Programming Language :: Python :: 3.11",
+ "Programming Language :: Python :: 3.12",
+ "Programming Language :: Python :: 3.13",
+ "Programming Language :: Rust",
+]
+
+[project.optional-dependencies]
+bench = ["msgpack>=1.0.7"]
+
+[tool.maturin]
+manifest-path = "crates/reflex_py/Cargo.toml"
+module-name = "reflex_compiler_rust._native"
+python-source = "python"
+features = ["pyo3/extension-module"]
diff --git a/packages/reflex-compiler-rust/python/reflex_compiler_rust/__init__.py b/packages/reflex-compiler-rust/python/reflex_compiler_rust/__init__.py
new file mode 100644
index 00000000000..cb288fac183
--- /dev/null
+++ b/packages/reflex-compiler-rust/python/reflex_compiler_rust/__init__.py
@@ -0,0 +1,5 @@
+"""Spike-stage Python package. The Rust extension is at `._native`."""
+
+from . import _native # noqa: F401
+
+__all__ = ["_native"]
diff --git a/packages/reflex-compiler-rust/rust-toolchain.toml b/packages/reflex-compiler-rust/rust-toolchain.toml
new file mode 100644
index 00000000000..73cb934de47
--- /dev/null
+++ b/packages/reflex-compiler-rust/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+components = ["rustfmt", "clippy"]
diff --git a/packages/reflex-compiler-rust/scripts/spike_bench.py b/packages/reflex-compiler-rust/scripts/spike_bench.py
new file mode 100644
index 00000000000..78c53dbadfe
--- /dev/null
+++ b/packages/reflex-compiler-rust/scripts/spike_bench.py
@@ -0,0 +1,326 @@
+"""Napkin-math microbenchmarks for the Rust-compiler spike.
+
+Run with:
+
+ uv run --with msgpack python packages/reflex-compiler-rust/scripts/spike_bench.py
+
+Produces a comparison table for each tree size, hitting the four claims in
+RUST_REWRITE_PLAN.md that we wanted to stress-test:
+
+ 1. PyO3 crossing cost (empty + bytes passthrough)
+ 2. msgpack pack cost on the Python side (with vs without per-node dicts)
+ 3. rmp-serde vs hand-rolled msgpack deserializer in Rust
+ 4. Python tree-walk + JSX-like emit vs the same in Rust (both via PyO3)
+
+The tree shape is intentionally close to PageIR/ComponentIR (plan §4.1):
+element nodes have a tag, a list of (prop_name, prop_expr) pairs, and
+children; text nodes have a string. Wire format is positional msgpack arrays
+(documented at the top of reflex_py/src/lib.rs).
+"""
+
+from __future__ import annotations
+
+import argparse
+import random
+import statistics
+import sys
+import time
+from io import BytesIO
+from typing import Callable
+
+import msgpack
+from reflex_compiler_rust import _native
+
+sys.setrecursionlimit(50_000)
+
+
+# ---- synthetic tree ---------------------------------------------------------
+
+
+TAG_POOL = ["Box", "Text", "Flex", "Button", "Stack", "Heading", "Link", "Image"]
+PROP_NAMES = ["color", "size", "weight", "padding", "margin", "onClick", "href", "src"]
+PROP_VALS = [
+ '"red"',
+ '"blue"',
+ "1",
+ "2",
+ "state.value",
+ '"sm"',
+ "() => set(true)",
+ '"/foo"',
+]
+
+
+def make_tree(n_nodes: int, seed: int = 0) -> dict:
+ """Build a breadth-balanced tree with ~n_nodes total nodes.
+
+ Depth stays at O(log n) because we expand the next un-expanded element on
+ every step (BFS), giving each element 3-5 children until the budget is
+ spent. Real Reflex pages look like this — bushy, not linear.
+ """
+ rng = random.Random(seed)
+
+ def new_element() -> dict:
+ n_props = rng.randint(2, 4)
+ return {
+ "kind": 0,
+ "tag": rng.choice(TAG_POOL),
+ "props": [
+ (rng.choice(PROP_NAMES), rng.choice(PROP_VALS)) for _ in range(n_props)
+ ],
+ "children": [],
+ }
+
+ def new_text() -> dict:
+ return {"kind": 1, "value": "lorem " + "ipsum " * rng.randint(1, 4)}
+
+ root = new_element()
+ frontier = [root]
+ created = 1
+ while frontier and created < n_nodes:
+ parent = frontier.pop(0)
+ n_children = rng.randint(3, 5)
+ for _ in range(n_children):
+ if created >= n_nodes:
+ break
+ if rng.random() < 0.25:
+ parent["children"].append(new_text())
+ created += 1
+ else:
+ child = new_element()
+ parent["children"].append(child)
+ frontier.append(child)
+ created += 1
+ return root
+
+
+def count_nodes(node: dict) -> int:
+ stack = [node]
+ n = 0
+ while stack:
+ cur = stack.pop()
+ n += 1
+ if cur["kind"] == 0:
+ stack.extend(cur["children"])
+ return n
+
+
+# ---- packers ----------------------------------------------------------------
+#
+# Two packing strategies:
+#
+# pack_via_dict: build a tree-of-dicts (what naive code would do) then
+# msgpack.packb the whole thing. Pays the dict construction
+# cost + msgpack walks the dict.
+#
+# pack_streaming: call Packer methods directly while walking the tree, so
+# we never materialize a per-node dict. This is the §1 claim:
+# "no per-node dict". For napkin math we walk the same
+# tree-of-dicts to be fair, but real Python emit code would
+# walk Component objects via Component.to_ir(packer).
+
+
+def pack_via_dict(tree: dict) -> bytes:
+ """Convert tree-of-dicts to positional arrays, then packb."""
+
+ def to_arr(n):
+ if n["kind"] == 1:
+ return [1, n["value"]]
+ return [
+ 0,
+ n["tag"],
+ [[k, v] for (k, v) in n["props"]],
+ [to_arr(c) for c in n["children"]],
+ ]
+
+ return msgpack.packb(to_arr(tree), use_bin_type=True)
+
+
+def pack_streaming(tree: dict) -> bytes:
+ """Stream directly into a Packer; no intermediate per-node objects."""
+ buf = BytesIO()
+ packer = msgpack.Packer(use_bin_type=True)
+
+ def emit(n):
+ if n["kind"] == 1:
+ buf.write(packer.pack_array_header(2))
+ buf.write(packer.pack(1))
+ buf.write(packer.pack(n["value"]))
+ return
+ props = n["props"]
+ children = n["children"]
+ buf.write(packer.pack_array_header(4))
+ buf.write(packer.pack(0))
+ buf.write(packer.pack(n["tag"]))
+ buf.write(packer.pack_array_header(len(props)))
+ for k, v in props:
+ buf.write(packer.pack_array_header(2))
+ buf.write(packer.pack(k))
+ buf.write(packer.pack(v))
+ buf.write(packer.pack_array_header(len(children)))
+ for c in children:
+ emit(c)
+
+ emit(tree)
+ return buf.getvalue()
+
+
+# ---- pure-Python walk + emit (the baseline) ---------------------------------
+#
+# Two flavors:
+#
+# walk_emit_concat: the dumb O(n^2) version with string concatenation.
+# walk_emit_join: list-of-fragments + "".join at the end. This is what
+# well-written Python codegen would do.
+#
+# Both walk the same tree-of-dicts. The shape mirrors what Rust emits.
+
+
+def walk_emit_concat(tree: dict) -> bytes:
+ def go(n):
+ if n["kind"] == 1:
+ return f'"{n["value"]}"'
+ s = "jsx(" + n["tag"] + ",{"
+ for i, (k, v) in enumerate(n["props"]):
+ if i:
+ s += ","
+ s += k + ":" + v
+ s += "}"
+ for c in n["children"]:
+ s += "," + go(c)
+ s += ")"
+ return s
+
+ return go(tree).encode()
+
+
+def walk_emit_join(tree: dict) -> bytes:
+ parts: list[str] = []
+ app = parts.append
+
+ def go(n):
+ if n["kind"] == 1:
+ app('"')
+ app(n["value"])
+ app('"')
+ return
+ app("jsx(")
+ app(n["tag"])
+ app(",{")
+ for i, (k, v) in enumerate(n["props"]):
+ if i:
+ app(",")
+ app(k)
+ app(":")
+ app(v)
+ app("}")
+ for c in n["children"]:
+ app(",")
+ go(c)
+ app(")")
+
+ go(tree)
+ return "".join(parts).encode()
+
+
+# ---- timer ------------------------------------------------------------------
+
+
+def bench(label: str, fn: Callable[[], object], iters: int) -> tuple[str, float, float]:
+ """Run fn() iters times, return (label, median_ns_per_op, min_ns_per_op)."""
+ # warmup
+ for _ in range(min(3, iters)):
+ fn()
+ samples = []
+ for _ in range(iters):
+ t0 = time.perf_counter_ns()
+ fn()
+ samples.append(time.perf_counter_ns() - t0)
+ return label, float(statistics.median(samples)), float(min(samples))
+
+
+def fmt_time(ns: float) -> str:
+ if ns < 1_000:
+ return f"{ns:7.0f}ns"
+ if ns < 1_000_000:
+ return f"{ns / 1_000:7.2f}µs"
+ if ns < 1_000_000_000:
+ return f"{ns / 1_000_000:7.2f}ms"
+ return f"{ns / 1_000_000_000:7.3f}s "
+
+
+# ---- main -------------------------------------------------------------------
+
+
+def run_size(n_nodes: int, iters: int) -> None:
+ print(f"\n=== tree size: target n={n_nodes} nodes, iters={iters} ===")
+ tree = make_tree(n_nodes)
+ actual_n = count_nodes(tree)
+ blob = pack_streaming(tree)
+ print(f"actual node count = {actual_n}, msgpack size = {len(blob)} bytes "
+ f"({len(blob) / actual_n:.1f} B/node)")
+
+ rows = []
+
+ # 1. PyO3 crossing
+ rows.append(bench("pyo3 empty_call", _native.empty_call, iters))
+ rows.append(bench("pyo3 add_one(1)", lambda: _native.add_one(1), iters))
+ rows.append(
+ bench(
+ f"pyo3 bytes_passthrough ({len(blob)}B)",
+ lambda: _native.bytes_passthrough(blob),
+ iters,
+ )
+ )
+
+ # 2. Python pack
+ rows.append(bench("py msgpack pack (via dict)", lambda: pack_via_dict(tree), iters))
+ rows.append(bench("py msgpack pack (streaming)", lambda: pack_streaming(tree), iters))
+
+ # 3. Rust deserialize-only
+ rows.append(bench("rs walk_serde (rmp-serde, no emit)", lambda: _native.walk_serde(blob), iters))
+ rows.append(bench("rs walk_manual (hand-rolled, no emit)", lambda: _native.walk_manual(blob), iters))
+
+ # 4. Walk + emit (the actual codegen analog)
+ rows.append(bench("py walk_emit_concat", lambda: walk_emit_concat(tree), iters))
+ rows.append(bench("py walk_emit_join", lambda: walk_emit_join(tree), iters))
+ rows.append(bench("rs walk_serde_emit (rmp-serde + emit)", lambda: _native.walk_serde_emit(blob), iters))
+ rows.append(bench("rs walk_manual_emit (hand-rolled + emit)", lambda: _native.walk_manual_emit(blob), iters))
+ rows.append(bench("rs walk_arena_emit (bumpalo + emit)", lambda: _native.walk_arena_emit(blob), iters))
+
+ # 5. End-to-end Python→Rust round-trip vs pure-Python join
+ def e2e():
+ b = pack_streaming(tree)
+ return _native.walk_manual_emit(b)
+
+ rows.append(bench("e2e pack_streaming + rs walk_manual_emit", e2e, max(iters // 2, 1)))
+
+ print(f"{'label':<46} {'median':>10} {'min':>10} {'µs/node':>9}")
+ print("-" * 80)
+ for label, med, mn in rows:
+ per_node = (med / actual_n) / 1_000 # µs per node
+ print(f"{label:<46} {fmt_time(med):>10} {fmt_time(mn):>10} {per_node:>8.3f}")
+
+
+def main() -> None:
+ parser = argparse.ArgumentParser()
+ parser.add_argument(
+ "--sizes",
+ type=str,
+ default="10,100,1000,10000",
+ help="comma-separated tree-size targets",
+ )
+ parser.add_argument("--iters", type=int, default=50)
+ args = parser.parse_args()
+
+ sizes = [int(s) for s in args.sizes.split(",")]
+ iter_for = lambda n: max(1, min(args.iters, 2000 // max(1, n // 100)))
+
+ print(f"python: {sys.version.split()[0]}")
+ print(f"msgpack: {msgpack.__version__}")
+ for n in sizes:
+ run_size(n, iter_for(n))
+
+
+if __name__ == "__main__":
+ main()
diff --git a/packages/reflex-markdown-rust/Cargo.lock b/packages/reflex-markdown-rust/Cargo.lock
new file mode 100644
index 00000000000..2d344e725db
--- /dev/null
+++ b/packages/reflex-markdown-rust/Cargo.lock
@@ -0,0 +1,217 @@
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diff --git a/packages/reflex-markdown-rust/Cargo.toml b/packages/reflex-markdown-rust/Cargo.toml
new file mode 100644
index 00000000000..fff88a6b5ee
--- /dev/null
+++ b/packages/reflex-markdown-rust/Cargo.toml
@@ -0,0 +1,20 @@
+[workspace]
+resolver = "2"
+members = ["crates/reflex_markdown_py"]
+
+[workspace.package]
+edition = "2021"
+rust-version = "1.79"
+license = "Apache-2.0"
+publish = false
+
+[workspace.dependencies]
+pyo3 = { version = "0.22", features = ["abi3-py310", "extension-module"] }
+pulldown-cmark = { version = "0.12", default-features = false, features = ["html"] }
+
+[profile.release]
+opt-level = 3
+lto = "fat"
+codegen-units = 1
+debug = false
+strip = "symbols"
diff --git a/packages/reflex-markdown-rust/crates/reflex_markdown_py/Cargo.toml b/packages/reflex-markdown-rust/crates/reflex_markdown_py/Cargo.toml
new file mode 100644
index 00000000000..ac581cb0f50
--- /dev/null
+++ b/packages/reflex-markdown-rust/crates/reflex_markdown_py/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "reflex_markdown_py"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[lib]
+name = "_native"
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = { workspace = true }
+pulldown-cmark = { workspace = true }
diff --git a/packages/reflex-markdown-rust/crates/reflex_markdown_py/src/lib.rs b/packages/reflex-markdown-rust/crates/reflex_markdown_py/src/lib.rs
new file mode 100644
index 00000000000..1942c10c2d1
--- /dev/null
+++ b/packages/reflex-markdown-rust/crates/reflex_markdown_py/src/lib.rs
@@ -0,0 +1,105 @@
+//! pulldown-cmark Markdown → HTML, exposed as a Reflex acceleration wheel.
+//!
+//! Replaces the legacy mistletoe-based path on the Python side (see plan
+//! §5: markdown is ~0.79s of the 10.1s docs-app baseline; pulldown-cmark
+//! is consistently 15-30× faster on equivalent inputs).
+//!
+//! Exposed surface (all functions release the GIL during parse):
+//!
+//! * `markdown_to_html(text: str) -> str` — render with the default
+//! `Options::ENABLE_TABLES | ENABLE_FOOTNOTES | ENABLE_STRIKETHROUGH
+//! | ENABLE_TASKLISTS | ENABLE_SMART_PUNCTUATION` set, matching the
+//! subset Reflex docs use today.
+//! * `markdown_to_html_with(text, options: int) -> str` — caller-controlled
+//! options bitmask. Constants exposed on the module: `OPT_TABLES`,
+//! `OPT_FOOTNOTES`, `OPT_STRIKETHROUGH`, `OPT_TASKLISTS`,
+//! `OPT_SMART_PUNCTUATION`, `OPT_HEADING_ATTRIBUTES`, `OPT_YAML_STYLE_METADATA_BLOCKS`.
+//! * `event_count(text: str) -> int` — quick benchmark probe; counts pulldown
+//! events without rendering. Useful for perf comparisons.
+
+use pulldown_cmark::{html, Options, Parser};
+use pyo3::prelude::*;
+
+const DEFAULT_OPTS: u32 = Options::ENABLE_TABLES.bits()
+ | Options::ENABLE_FOOTNOTES.bits()
+ | Options::ENABLE_STRIKETHROUGH.bits()
+ | Options::ENABLE_TASKLISTS.bits()
+ | Options::ENABLE_SMART_PUNCTUATION.bits();
+
+#[pyfunction]
+fn markdown_to_html(py: Python<'_>, text: &str) -> PyResult<String> {
+ let owned = text.to_owned();
+ Ok(py.allow_threads(move || render_html(&owned, Options::from_bits_truncate(DEFAULT_OPTS))))
+}
+
+#[pyfunction]
+fn markdown_to_html_with(py: Python<'_>, text: &str, options: u32) -> PyResult<String> {
+ let owned = text.to_owned();
+ Ok(py.allow_threads(move || render_html(&owned, Options::from_bits_truncate(options))))
+}
+
+#[pyfunction]
+fn event_count(py: Python<'_>, text: &str) -> PyResult<usize> {
+ let owned = text.to_owned();
+ Ok(py.allow_threads(move || {
+ Parser::new_ext(&owned, Options::from_bits_truncate(DEFAULT_OPTS)).count()
+ }))
+}
+
+fn render_html(text: &str, opts: Options) -> String {
+ let parser = Parser::new_ext(text, opts);
+ let mut out = String::with_capacity(text.len() * 2);
+ html::push_html(&mut out, parser);
+ out
+}
+
+#[pymodule]
+fn _native(_py: Python<'_>, m: &Bound<'_, PyModule>) -> PyResult<()> {
+ m.add_function(wrap_pyfunction!(markdown_to_html, m)?)?;
+ m.add_function(wrap_pyfunction!(markdown_to_html_with, m)?)?;
+ m.add_function(wrap_pyfunction!(event_count, m)?)?;
+
+ // Option constants — kept in sync with `pulldown_cmark::Options` bit
+ // values. Python callers can OR these together and pass to
+ // `markdown_to_html_with`. Bumping pulldown-cmark may shift these; the
+ // version is pinned in workspace Cargo.toml so we'll notice.
+ m.add("OPT_TABLES", Options::ENABLE_TABLES.bits())?;
+ m.add("OPT_FOOTNOTES", Options::ENABLE_FOOTNOTES.bits())?;
+ m.add("OPT_STRIKETHROUGH", Options::ENABLE_STRIKETHROUGH.bits())?;
+ m.add("OPT_TASKLISTS", Options::ENABLE_TASKLISTS.bits())?;
+ m.add("OPT_SMART_PUNCTUATION", Options::ENABLE_SMART_PUNCTUATION.bits())?;
+ m.add("OPT_HEADING_ATTRIBUTES", Options::ENABLE_HEADING_ATTRIBUTES.bits())?;
+ m.add(
+ "OPT_YAML_STYLE_METADATA_BLOCKS",
+ Options::ENABLE_YAML_STYLE_METADATA_BLOCKS.bits(),
+ )?;
+ m.add("DEFAULT_OPTS", DEFAULT_OPTS)?;
+ Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn renders_basic_markdown() {
+ let html = render_html("# Hello\n\nworld", Options::empty());
+ assert!(html.contains("<h1>Hello</h1>"));
+ assert!(html.contains("<p>world</p>"));
+ }
+
+ #[test]
+ fn renders_tables_when_enabled() {
+ let md = "| a | b |\n|---|---|\n| 1 | 2 |";
+ let plain = render_html(md, Options::empty());
+ let with_tables = render_html(md, Options::ENABLE_TABLES);
+ assert!(!plain.contains("<table>"));
+ assert!(with_tables.contains("<table>"));
+ }
+
+ #[test]
+ fn counts_events() {
+ let parser = Parser::new_ext("# hi\n\np", Options::empty());
+ assert!(parser.count() > 0);
+ }
+}
diff --git a/packages/reflex-markdown-rust/pyproject.toml b/packages/reflex-markdown-rust/pyproject.toml
new file mode 100644
index 00000000000..917296df07c
--- /dev/null
+++ b/packages/reflex-markdown-rust/pyproject.toml
@@ -0,0 +1,24 @@
+[build-system]
+requires = ["maturin>=1.7,<2"]
+build-backend = "maturin"
+
+[project]
+name = "reflex-markdown-rust"
+version = "0.0.0"
+description = "pulldown-cmark Markdown parser as a Reflex acceleration wheel (PyO3 + maturin)."
+requires-python = ">=3.10"
+license = { text = "Apache-2.0" }
+classifiers = [
+ "Programming Language :: Python :: 3",
+ "Programming Language :: Python :: 3.10",
+ "Programming Language :: Python :: 3.11",
+ "Programming Language :: Python :: 3.12",
+ "Programming Language :: Python :: 3.13",
+ "Programming Language :: Rust",
+]
+
+[tool.maturin]
+manifest-path = "crates/reflex_markdown_py/Cargo.toml"
+module-name = "reflex_markdown_rust._native"
+python-source = "python"
+features = ["pyo3/extension-module"]
diff --git a/packages/reflex-markdown-rust/python/reflex_markdown_rust/__init__.py b/packages/reflex-markdown-rust/python/reflex_markdown_rust/__init__.py
new file mode 100644
index 00000000000..40d0f3814e6
--- /dev/null
+++ b/packages/reflex-markdown-rust/python/reflex_markdown_rust/__init__.py
@@ -0,0 +1,41 @@
+"""Rust acceleration wheel for Reflex's Markdown pipeline (pulldown-cmark).
+
+The legacy Reflex Markdown path uses Python's ``mistletoe`` (~0.79s of the
+10.1s docs-app cold-compile baseline). This wheel exposes a near drop-in
+``markdown_to_html`` that's 15-30× faster on equivalent inputs.
+
+Usage::
+
+ from reflex_markdown_rust import markdown_to_html, OPT_TABLES, OPT_FOOTNOTES
+
+ html = markdown_to_html("# Hello\\nworld")
+ html = markdown_to_html_with(text, OPT_TABLES | OPT_FOOTNOTES)
+"""
+
+from reflex_markdown_rust._native import ( # noqa: F401
+ DEFAULT_OPTS,
+ OPT_FOOTNOTES,
+ OPT_HEADING_ATTRIBUTES,
+ OPT_SMART_PUNCTUATION,
+ OPT_STRIKETHROUGH,
+ OPT_TABLES,
+ OPT_TASKLISTS,
+ OPT_YAML_STYLE_METADATA_BLOCKS,
+ event_count,
+ markdown_to_html,
+ markdown_to_html_with,
+)
+
+__all__ = [
+ "DEFAULT_OPTS",
+ "OPT_FOOTNOTES",
+ "OPT_HEADING_ATTRIBUTES",
+ "OPT_SMART_PUNCTUATION",
+ "OPT_STRIKETHROUGH",
+ "OPT_TABLES",
+ "OPT_TASKLISTS",
+ "OPT_YAML_STYLE_METADATA_BLOCKS",
+ "event_count",
+ "markdown_to_html",
+ "markdown_to_html_with",
+]
diff --git a/packages/reflex-markdown-rust/python/reflex_markdown_rust/_native.abi3.so b/packages/reflex-markdown-rust/python/reflex_markdown_rust/_native.abi3.so
new file mode 100755
index 00000000000..85251eb5bf0
Binary files /dev/null and b/packages/reflex-markdown-rust/python/reflex_markdown_rust/_native.abi3.so differ
diff --git a/packages/reflex-markdown-rust/rust-toolchain.toml b/packages/reflex-markdown-rust/rust-toolchain.toml
new file mode 100644
index 00000000000..73cb934de47
--- /dev/null
+++ b/packages/reflex-markdown-rust/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+components = ["rustfmt", "clippy"]
diff --git a/reflex/compiler/compiler.py b/reflex/compiler/compiler.py
index a0a934c1b6d..e2c45675d2d 100644
--- a/reflex/compiler/compiler.py
+++ b/reflex/compiler/compiler.py
@@ -280,12 +280,21 @@ def _validate_stylesheet(stylesheet_full_path: Path, assets_app_path: Path) -> N
raise ValueError(msg)
-def _compile_root_stylesheet(
+def _resolve_root_stylesheets(
stylesheets: list[str],
reset_style: bool = True,
plugins: Sequence[Plugin] | None = None,
-) -> str:
- """Compile the root stylesheet.
+) -> list[str]:
+ """Resolve the final list of stylesheet specifiers used by ``styles.css``.
+
+ Does the filesystem-walking and SASS-compile side effects that the
+ legacy compile flow needs, then returns just the list of URL/relative-
+ path strings the ``@import`` lines will reference. Used by:
+
+ * :func:`_compile_root_stylesheet` — the legacy template path.
+ * :func:`reflex.compiler.rust_pipeline._emit_static_artifacts` — the
+ rust pipeline that hands the resolved list to
+ :meth:`CompilerSession.compile_styles_root`.
Args:
stylesheets: The stylesheets to include in the root stylesheet.
@@ -293,7 +302,8 @@ def _compile_root_stylesheet(
plugins: The effective plugins for the active compile.
Returns:
- The compiled root stylesheet.
+ The resolved sheet specifiers in the order ``styles.css`` should
+ ``@import`` them.
Raises:
FileNotFoundError: If a specified stylesheet in assets directory does not exist.
@@ -378,6 +388,32 @@ def _compile_root_stylesheet(
'The `libsass` package is required to compile sass/scss stylesheet files. Run `pip install "libsass>=0.23.0"`.'
)
+ return sheets
+
+
+def _compile_root_stylesheet(
+ stylesheets: list[str],
+ reset_style: bool = True,
+ plugins: Sequence[Plugin] | None = None,
+) -> str:
+ """Compile the root stylesheet via the legacy ``styles_template``.
+
+ Thin wrapper around :func:`_resolve_root_stylesheets` plus the
+ template emit. The rust pipeline calls the resolver directly and
+ hands the result to ``sess.compile_styles_root`` instead.
+
+ Args:
+ stylesheets: The stylesheets to include in the root stylesheet.
+ reset_style: Whether to include CSS reset for margin and padding.
+ plugins: The effective plugins for the active compile.
+
+ Returns:
+ The compiled root stylesheet.
+
+ Raises:
+ FileNotFoundError: If a specified stylesheet in assets directory does not exist.
+ """
+ sheets = _resolve_root_stylesheets(stylesheets, reset_style, plugins)
return templates.styles_template(stylesheets=sheets)
diff --git a/reflex/compiler/diff_pipelines.py b/reflex/compiler/diff_pipelines.py
new file mode 100644
index 00000000000..20bddf30d7a
--- /dev/null
+++ b/reflex/compiler/diff_pipelines.py
@@ -0,0 +1,182 @@
+"""Side-by-side diff of the Python-compiled ``.web_python`` reference vs the
+current ``.web``.
+
+Run from a project directory after::
+
+ reflex run-rust --snapshot-python ...
+
+Usage::
+
+ python -m reflex.compiler.diff_pipelines # summary table
+ python -m reflex.compiler.diff_pipelines _index.jsx # unified diff of one file
+ python -m reflex.compiler.diff_pipelines --paths-only # just list mismatches
+"""
+
+from __future__ import annotations
+
+import argparse
+import difflib
+import sys
+from pathlib import Path
+
+# Files/folders that don't carry pipeline-significant info — skip them so the
+# diff focuses on semantic differences.
+_IGNORE = {
+ "node_modules",
+ ".vite",
+ "bun.lock",
+ "package-lock.json",
+ ".gitignore",
+ "reflex.lock",
+ "reflex.json",
+ "reflex.install_frontend_packages.cached",
+ ".npmrc",
+ "bunfig.toml",
+}
+
+
+def _walk(root: Path) -> dict[str, Path]:
+ out: dict[str, Path] = {}
+ if not root.is_dir():
+ return out
+ for p in root.rglob("*"):
+ if not p.is_file():
+ continue
+ rel = p.relative_to(root).as_posix()
+ # Skip any path that contains an ignored segment.
+ if any(part in _IGNORE for part in p.relative_to(root).parts):
+ continue
+ out[rel] = p
+ return out
+
+
+def _summary(py_root: Path, rs_root: Path) -> int:
+ py_files = _walk(py_root)
+ rs_files = _walk(rs_root)
+ all_paths = sorted(set(py_files) | set(rs_files))
+
+ only_py: list[str] = []
+ only_rs: list[str] = []
+ differ: list[tuple[str, int, int]] = []
+ same: int = 0
+ for rel in all_paths:
+ a = py_files.get(rel)
+ b = rs_files.get(rel)
+ if a is None:
+ only_rs.append(rel)
+ continue
+ if b is None:
+ only_py.append(rel)
+ continue
+ ba = a.read_bytes()
+ bb = b.read_bytes()
+ if ba == bb:
+ same += 1
+ else:
+ differ.append((rel, len(ba), len(bb)))
+
+ print(f"python reference: {py_root}")
+ print(f"current .web: {rs_root}")
+ print()
+ print(f"identical files: {same}")
+ print(f"differ: {len(differ)}")
+ print(f"only in python: {len(only_py)}")
+ print(f"only in current: {len(only_rs)}")
+ print()
+
+ if differ:
+ print(f"{'path':<60} {'py-bytes':>10} {'rs-bytes':>10} {'Δ':>8}")
+ print("-" * 92)
+ for rel, na, nb in differ:
+ print(f" {rel:<58} {na:>10} {nb:>10} {nb - na:>+8}")
+ print()
+
+ if only_py:
+ print("Only in python reference:")
+ for rel in only_py:
+ print(f" {rel}")
+ print()
+ if only_rs:
+ print("Only in current .web:")
+ for rel in only_rs:
+ print(f" {rel}")
+ print()
+
+ return 0 if not (only_py or only_rs or differ) else 1
+
+
+def _diff_one(py_root: Path, rs_root: Path, target: str) -> int:
+ """Print a unified diff for a single relative path or basename match."""
+ py_files = _walk(py_root)
+ rs_files = _walk(rs_root)
+
+ matches: list[str] = []
+ if target in py_files or target in rs_files:
+ matches.append(target)
+ else:
+ for rel in sorted(set(py_files) | set(rs_files)):
+ if rel.endswith("/" + target) or rel.endswith(target):
+ matches.append(rel)
+ if not matches:
+ print(f"no match for {target!r}", file=sys.stderr)
+ return 1
+ for rel in matches:
+ a = py_files.get(rel)
+ b = rs_files.get(rel)
+ a_lines = a.read_text(errors="replace").splitlines(keepends=True) if a else []
+ b_lines = b.read_text(errors="replace").splitlines(keepends=True) if b else []
+ diff = list(
+ difflib.unified_diff(
+ a_lines,
+ b_lines,
+ fromfile=f"python/{rel}",
+ tofile=f"current/{rel}",
+ n=3,
+ )
+ )
+ if not diff:
+ print(f"=== {rel}: identical ===")
+ continue
+ print(f"=== {rel} ===")
+ sys.stdout.writelines(diff)
+ print()
+ return 0
+
+
+def main() -> int:
+ parser = argparse.ArgumentParser(description=__doc__)
+ parser.add_argument(
+ "target",
+ nargs="?",
+ help="basename or relative path to show a unified diff for",
+ )
+ parser.add_argument("--python-dir", default=".web_python")
+ parser.add_argument("--web-dir", default=".web")
+ parser.add_argument(
+ "--paths-only",
+ action="store_true",
+ help="list mismatching paths, no byte counts",
+ )
+ args = parser.parse_args()
+
+ py_root = Path(args.python_dir).resolve()
+ rs_root = Path(args.web_dir).resolve()
+
+ if not py_root.is_dir():
+ print(
+ f"python reference not found at {py_root}. "
+ f"Run `reflex run-rust --snapshot-python` first.",
+ file=sys.stderr,
+ )
+ return 2
+ if not rs_root.is_dir():
+ print(f"current .web not found at {rs_root}", file=sys.stderr)
+ return 2
+
+ if args.target:
+ return _diff_one(py_root, rs_root, args.target)
+ return _summary(py_root, rs_root)
+
+
+if __name__ == "__main__":
+ raise SystemExit(main())
diff --git a/reflex/compiler/ir/__init__.py b/reflex/compiler/ir/__init__.py
new file mode 100644
index 00000000000..59881f760f2
--- /dev/null
+++ b/reflex/compiler/ir/__init__.py
@@ -0,0 +1,25 @@
+"""IR layer between Reflex's Python Component classes and the Rust compiler.
+
+**Status (2026-05-17):** Demoted to debug / diagnostic use only. The
+production compile path is ``reflex_pyread`` (PyO3 walks the Component
+tree directly — plan §0b lever (a)); ``reflex.compiler.ir.bridge`` is
+deleted. The IR-construction helpers below survive because the codegen
+corpus IR-shape tests still build IR programmatically, but no production
+code path goes through msgpack anymore.
+
+* :mod:`reflex.compiler.ir.schema` — wire-format constants matching
+ ``RUST_REWRITE_PLAN.md`` §4.
+* :mod:`reflex.compiler.ir.builder` — programmatic builders (``element``,
+ ``text``, ``foreach``, …) that produce list-of-lists IR ready for
+ ``msgpack.packb``.
+* :mod:`reflex.compiler.ir.pack` — one-call ``packb`` wrappers.
+* :mod:`reflex.compiler.ir.canonical` — canonical ``NodeId`` hashing
+ (``xxh3_64`` of the JSON-serializable canonical form).
+
+The IR contract is positional msgpack arrays; see the Rust side
+``crates/reflex_ir/src/parse.rs`` for the canonical wire format.
+"""
+
+from reflex.compiler.ir import builder, canonical, pack, schema
+
+__all__ = ["builder", "canonical", "pack", "schema"]
diff --git a/reflex/compiler/ir/builder.py b/reflex/compiler/ir/builder.py
new file mode 100644
index 00000000000..ed80756420c
--- /dev/null
+++ b/reflex/compiler/ir/builder.py
@@ -0,0 +1,352 @@
+"""Programmatic builder for the Rust-Python IR.
+
+Every helper here returns a plain ``list`` in the positional shape the Rust
+parser expects (see ``RUST_REWRITE_PLAN.md`` §4.1 and
+``crates/reflex_ir/src/parse.rs``). The whole tree is built bottom-up and
+serialized in **one** ``msgpack.packb`` call — see the spike note in §1 of
+the plan: streaming via ``msgpack.Packer`` is 5-7% slower because
+msgpack-python descends a tree-of-lists in C.
+
+The builders deliberately accept ``Sequence``/``Mapping`` Python types and
+do no validation — they're the hottest path in IR emit and pre-validated
+component classes feed them directly. Bad inputs surface as
+``ParseError::BadArrayLen`` on the Rust side, which contains enough context
+to trace back to the offending builder call.
+
+Example::
+
+ >>> from reflex.compiler.ir import builder as ir
+ >>> page = ir.page(
+ ... route="/about",
+ ... root=ir.element(
+ ... "div",
+ ... props=[("id", ir.js_expr("\"main\""))],
+ ... children=[ir.text("hi")],
+ ... ),
+ ... )
+"""
+
+from __future__ import annotations
+
+from collections.abc import Iterable, Mapping, Sequence
+from typing import Any
+
+from reflex.compiler.ir import schema as _schema
+from reflex.compiler.ir.canonical import hash_ir_subtree
+
+# Type aliases for clarity — these are list aliases, not nominal types.
+ValueIR = list
+ComponentIR = list
+PageIR = list
+VarDataIR = list
+EventHandlerIR = list
+HookIR = list
+SourceLocIR = list
+MatchArmIR = list
+MetaIR = list
+LiteralIR = list
+
+# ---- Leaf builders ----------------------------------------------------------
+
+
+def source_loc(file_id: int = 0, line: int = 0, col: int = 0) -> SourceLocIR:
+ """Build a ``SourceLoc`` triple. ``(0, 0, 0)`` means synthetic."""
+ return [file_id, line, col]
+
+
+SYNTHETIC_LOC: SourceLocIR = source_loc()
+
+
+def var_data(
+ *,
+ hooks: Sequence[str] = (),
+ imports: Sequence[tuple[str, str]] = (),
+ state: str | None = None,
+ deps: Sequence[str] = (),
+ position: int | None = None,
+ components: Sequence[str] = (),
+) -> VarDataIR:
+ """Build a ``VarData`` IR fragment.
+
+ Args:
+ hooks: raw JS hook fragments this expression depends on.
+ imports: ``(module, name)`` pairs.
+ state: owning state class name, if any.
+ deps: dependency identifiers.
+ position: hoist position hint.
+ components: component memo wrappers needed at hoist time.
+
+ Returns:
+ The positional-array IR fragment.
+ """
+ return [
+ list(hooks),
+ [[m, n] for m, n in imports],
+ state,
+ list(deps),
+ position,
+ list(components),
+ ]
+
+
+EMPTY_VAR_DATA: VarDataIR = var_data()
+
+
+# ---- Value builders ---------------------------------------------------------
+
+
+def js_expr(expr: str, var_data_: VarDataIR | None = None) -> ValueIR:
+ """A pre-baked JS expression with optional VarData.
+
+ Args:
+ expr: the JS source string (Reflex Python typically calls ``str(var)``
+ for a ``Var`` instance to get this).
+ var_data_: hoist metadata; defaults to empty.
+ """
+ return [_schema.VALUE_JS_EXPR, expr, var_data_ if var_data_ is not None else EMPTY_VAR_DATA]
+
+
+def literal_null() -> ValueIR:
+ return [_schema.VALUE_LITERAL, [_schema.LITERAL_NULL]]
+
+
+def literal_bool(value: bool) -> ValueIR:
+ return [_schema.VALUE_LITERAL, [_schema.LITERAL_BOOL, bool(value)]]
+
+
+def literal_int(value: int) -> ValueIR:
+ return [_schema.VALUE_LITERAL, [_schema.LITERAL_INT, int(value)]]
+
+
+def literal_float(value: float) -> ValueIR:
+ return [_schema.VALUE_LITERAL, [_schema.LITERAL_FLOAT, float(value)]]
+
+
+def literal_str(value: str) -> ValueIR:
+ return [_schema.VALUE_LITERAL, [_schema.LITERAL_STR, value]]
+
+
+def ref(name: str) -> ValueIR:
+ return [_schema.VALUE_REF, name]
+
+
+def event_handler(
+ trigger: str, expr: str, var_data_: VarDataIR | None = None
+) -> EventHandlerIR:
+ return [trigger, expr, var_data_ if var_data_ is not None else EMPTY_VAR_DATA]
+
+
+def hook(code: str, deps: Sequence[str] = (), position: int = _schema.HOOK_POSITION_USER) -> HookIR:
+ return [code, list(deps), int(position)]
+
+
+# ---- Component builders -----------------------------------------------------
+#
+# Each builder accepts an optional ``id``. When omitted we hash the canonical
+# bytes of the constructed node to assign a stable NodeId. Component classes
+# that already know a stable id (e.g. one derived from their Python source
+# location) can pass it directly to skip the hash.
+
+
+def _assign_id(component_ir: ComponentIR, id_index: int) -> ComponentIR:
+ """Compute and set the NodeId at ``id_index`` if it's currently 0."""
+ if component_ir[id_index] == 0:
+ component_ir[id_index] = hash_ir_subtree(component_ir)
+ return component_ir
+
+
+def element(
+ tag: str,
+ *,
+ props: Sequence[tuple[str, ValueIR]] = (),
+ children: Sequence[ComponentIR] = (),
+ events: Sequence[EventHandlerIR] = (),
+ hooks: Sequence[HookIR] = (),
+ id: int = 0,
+ loc: SourceLocIR | None = None,
+) -> ComponentIR:
+ """Build an ``Element`` component IR node."""
+ return _assign_id(
+ [
+ _schema.COMPONENT_ELEMENT,
+ tag,
+ [[name, value] for name, value in props],
+ list(children),
+ list(events),
+ list(hooks),
+ id,
+ loc if loc is not None else SYNTHETIC_LOC,
+ ],
+ id_index=6,
+ )
+
+
+def text(value: str, *, id: int = 0, loc: SourceLocIR | None = None) -> ComponentIR:
+ """Build a ``Text`` component IR node."""
+ return _assign_id(
+ [_schema.COMPONENT_TEXT, value, id, loc if loc is not None else SYNTHETIC_LOC],
+ id_index=2,
+ )
+
+
+def foreach(
+ iter_value: ValueIR,
+ body: ComponentIR,
+ *,
+ id: int = 0,
+ loc: SourceLocIR | None = None,
+) -> ComponentIR:
+ """Build a ``Foreach`` component IR node."""
+ return _assign_id(
+ [
+ _schema.COMPONENT_FOREACH,
+ iter_value,
+ body,
+ id,
+ loc if loc is not None else SYNTHETIC_LOC,
+ ],
+ id_index=3,
+ )
+
+
+def cond(
+ test: ValueIR,
+ then: ComponentIR,
+ else_: ComponentIR | None = None,
+ *,
+ id: int = 0,
+ loc: SourceLocIR | None = None,
+) -> ComponentIR:
+ """Build a ``Cond`` component IR node."""
+ return _assign_id(
+ [
+ _schema.COMPONENT_COND,
+ test,
+ then,
+ else_,
+ id,
+ loc if loc is not None else SYNTHETIC_LOC,
+ ],
+ id_index=4,
+ )
+
+
+def match_arm(case: ValueIR, body: ComponentIR) -> MatchArmIR:
+ return [case, body]
+
+
+def match(
+ value: ValueIR,
+ arms: Sequence[MatchArmIR],
+ default: ComponentIR | None = None,
+ *,
+ id: int = 0,
+ loc: SourceLocIR | None = None,
+) -> ComponentIR:
+ """Build a ``Match`` component IR node."""
+ return _assign_id(
+ [
+ _schema.COMPONENT_MATCH,
+ value,
+ list(arms),
+ default,
+ id,
+ loc if loc is not None else SYNTHETIC_LOC,
+ ],
+ id_index=4,
+ )
+
+
+def memoize(
+ inner: ComponentIR,
+ key: int,
+ *,
+ id: int = 0,
+ loc: SourceLocIR | None = None,
+) -> ComponentIR:
+ """Build a ``Memoize`` component IR node."""
+ return _assign_id(
+ [
+ _schema.COMPONENT_MEMOIZE,
+ inner,
+ int(key),
+ id,
+ loc if loc is not None else SYNTHETIC_LOC,
+ ],
+ id_index=3,
+ )
+
+
+def fragment(
+ children: Sequence[ComponentIR],
+ *,
+ id: int = 0,
+ loc: SourceLocIR | None = None,
+) -> ComponentIR:
+ """Build a ``Fragment`` component IR node."""
+ return _assign_id(
+ [
+ _schema.COMPONENT_FRAGMENT,
+ list(children),
+ id,
+ loc if loc is not None else SYNTHETIC_LOC,
+ ],
+ id_index=2,
+ )
+
+
+def expr_node(
+ value: ValueIR, *, id: int = 0, loc: SourceLocIR | None = None
+) -> ComponentIR:
+ """Build an ``Expr`` component IR node (inline JSX expression)."""
+ return _assign_id(
+ [_schema.COMPONENT_EXPR, value, id, loc if loc is not None else SYNTHETIC_LOC],
+ id_index=2,
+ )
+
+
+# ---- Top-level page --------------------------------------------------------
+
+
+def meta(name: str, content: str) -> MetaIR:
+ return [name, content]
+
+
+def page(
+ *,
+ route: str,
+ root: ComponentIR,
+ title: str | None = None,
+ meta_: Iterable[MetaIR] = (),
+ source_files: Iterable[int] = (),
+ component_imports: Iterable[tuple[str, str]] = (),
+ state_bindings: Iterable[str] = (),
+ needs_ref: bool = False,
+) -> PageIR:
+ """Build a complete ``Page`` IR (schema v2).
+
+ Args:
+ route: URL path served by this page.
+ root: the root Component IR.
+ title: document title; ``None`` to omit.
+ meta_: per-page <meta> entries.
+ source_files: ``PyFileId``s this page depends on.
+ component_imports: ``(module, alias)`` pairs emitted as
+ ``import { <alias> } from "<module>";`` at module scope.
+ The alias may contain ``"<src> as <local>"`` to rename.
+ state_bindings: distinct ``StateContexts`` keys this page needs
+ via ``useContext``.
+ needs_ref: whether any element uses an ``id`` prop that the
+ React runtime should wire to a ``useRef``.
+ """
+ return [
+ _schema.SCHEMA_VERSION,
+ route,
+ root,
+ title,
+ list(meta_),
+ list(source_files),
+ [[m, a] for m, a in component_imports],
+ list(state_bindings),
+ bool(needs_ref),
+ ]
diff --git a/reflex/compiler/ir/canonical.py b/reflex/compiler/ir/canonical.py
new file mode 100644
index 00000000000..f0a0bce642f
--- /dev/null
+++ b/reflex/compiler/ir/canonical.py
@@ -0,0 +1,67 @@
+"""Canonical hashing for IR nodes. See RUST_REWRITE_PLAN.md §1 ("IR identity").
+
+Each Component carries a stable ``NodeId = hash(canonical_bytes)``. The
+canonical form is the IR list-of-lists serialized via the same packer the
+wire format uses — two semantically-equivalent IR subtrees hash to the same
+NodeId regardless of who built them.
+
+The Rust side uses ``xxh3_64`` (see ``crates/reflex_db/src/lib.rs``). The
+Python side prefers ``xxhash.xxh3_64_intdigest`` when available (so the same
+content hashes identically on both sides for debug builds) and falls back to
+``hashlib.blake2b(digest_size=8)`` otherwise. The two are not interchangeable
+across the Rust/Python boundary — but the wire format only carries the
+already-computed NodeId, so Rust trusts whatever Python ships. The mismatch
+only matters for the (debug-only) Pitfall 14 collision check, which is
+gated on the xxhash library being present.
+
+Collision probability at our use case (≤10⁶ unique nodes per running app)
+is negligible for any 64-bit hash; either implementation is fine.
+"""
+
+from __future__ import annotations
+
+import hashlib
+
+import msgpack
+
+try: # pragma: no cover - import guard
+ import xxhash
+
+ _USE_XXHASH = True
+except ImportError: # pragma: no cover - fallback path
+ xxhash = None # type: ignore[assignment]
+ _USE_XXHASH = False
+
+
+def _hash_bytes(b: bytes) -> int:
+ if _USE_XXHASH:
+ return xxhash.xxh3_64_intdigest(b) # type: ignore[union-attr]
+ return int.from_bytes(hashlib.blake2b(b, digest_size=8).digest(), "big")
+
+
+def hash_canonical_bytes(canonical: bytes) -> int:
+ """Hash already-packed canonical bytes.
+
+ Args:
+ canonical: msgpack-packed canonical form of an IR subtree.
+
+ Returns:
+ The 64-bit content hash.
+ """
+ return _hash_bytes(canonical)
+
+
+def hash_ir_subtree(subtree: list) -> int:
+ """Pack ``subtree`` to msgpack and hash the result.
+
+ Convenience helper for tests and the IR builder. Hot paths should call
+ :func:`hash_canonical_bytes` on bytes they already have.
+
+ Args:
+ subtree: any IR list-of-lists structure.
+
+ Returns:
+ The 64-bit content hash of the canonical packed bytes.
+ """
+ packed = msgpack.packb(subtree, use_bin_type=True)
+ return _hash_bytes(packed)
diff --git a/reflex/compiler/ir/pack.py b/reflex/compiler/ir/pack.py
new file mode 100644
index 00000000000..7f1e3521986
--- /dev/null
+++ b/reflex/compiler/ir/pack.py
@@ -0,0 +1,36 @@
+"""msgpack packing helpers for IR trees.
+
+The spike (§0 of ``RUST_REWRITE_PLAN.md``) measured that one ``msgpack.packb``
+call on a tree-of-lists is **5-7% faster** than streaming via
+``msgpack.Packer.pack_array_header`` per node, because ``msgpack-python``
+descends the structure in C and we'd pay Python-call overhead at every
+header otherwise. So this module is intentionally thin — one call per blob.
+"""
+
+from __future__ import annotations
+
+import msgpack
+
+
+def pack_page(page_ir: list) -> bytes:
+ """Pack a page IR (as built by :mod:`reflex.compiler.ir.builder`) to bytes.
+
+ Args:
+ page_ir: the list-of-lists IR.
+
+ Returns:
+ msgpack-encoded bytes ready for ``CompilerSession.compile_page``.
+ """
+ return msgpack.packb(page_ir, use_bin_type=True)
+
+
+def pack_theme(theme_ir: list) -> bytes:
+ return msgpack.packb(theme_ir, use_bin_type=True)
+
+
+def pack_global_state(state_ir: list) -> bytes:
+ return msgpack.packb(state_ir, use_bin_type=True)
+
+
+def pack_plugin_manifest(manifest_ir: list) -> bytes:
+ return msgpack.packb(manifest_ir, use_bin_type=True)
diff --git a/reflex/compiler/ir/schema.py b/reflex/compiler/ir/schema.py
new file mode 100644
index 00000000000..76a5e69c14f
--- /dev/null
+++ b/reflex/compiler/ir/schema.py
@@ -0,0 +1,53 @@
+"""Wire-format constants for the Rust-Python IR. See RUST_REWRITE_PLAN.md §4.
+
+Bumping ``SCHEMA_VERSION`` is a breaking change between Python and Rust; the
+Rust parser hard-rejects any blob whose first field doesn't match.
+
+Reading any of these constants is cost-free at runtime: they're module-level
+``int`` literals, no class lookup. Keep them in lock-step with
+``crates/reflex_ir/src/parse.rs::SCHEMA_VERSION``.
+"""
+
+from __future__ import annotations
+
+from typing import Final
+
+SCHEMA_VERSION: Final[int] = 2
+"""Current wire-format version. Increment for any breaking IR change.
+
+v2 added page-level ``component_imports``, ``state_bindings``, and
+``needs_ref`` fields so the Rust codegen can emit a fully-runtime-compatible
+page module (component-class imports + ``useContext(StateContexts.*)`` +
+``useRef``) without a Python postprocessor.
+"""
+
+# ---- Component kind discriminants -------------------------------------------
+COMPONENT_ELEMENT: Final[int] = 0
+COMPONENT_TEXT: Final[int] = 1
+COMPONENT_FOREACH: Final[int] = 2
+COMPONENT_COND: Final[int] = 3
+COMPONENT_MATCH: Final[int] = 4
+COMPONENT_MEMOIZE: Final[int] = 5
+COMPONENT_FRAGMENT: Final[int] = 6
+COMPONENT_EXPR: Final[int] = 7
+
+# ---- Value kind discriminants -----------------------------------------------
+VALUE_JS_EXPR: Final[int] = 0
+VALUE_LITERAL: Final[int] = 1
+VALUE_REF: Final[int] = 2
+
+# ---- Literal kind discriminants ---------------------------------------------
+LITERAL_NULL: Final[int] = 0
+LITERAL_BOOL: Final[int] = 1
+LITERAL_INT: Final[int] = 2
+LITERAL_FLOAT: Final[int] = 3
+LITERAL_STR: Final[int] = 4
+
+# ---- Other constants --------------------------------------------------------
+
+# Default Hook.position bucket meanings — must agree with reflex_semantic::Aggregated.
+HOOK_POSITION_INTERNAL: Final[int] = 0
+"""State/theme-bound hooks. Emitted first in the render function."""
+
+HOOK_POSITION_USER: Final[int] = 1
+"""User-supplied hooks. Emitted after internal hooks."""
diff --git a/reflex/compiler/markdown.py b/reflex/compiler/markdown.py
new file mode 100644
index 00000000000..78025d274b0
--- /dev/null
+++ b/reflex/compiler/markdown.py
@@ -0,0 +1,107 @@
+"""Markdown rendering with Rust acceleration.
+
+Exposes ``markdown_to_html(text) -> str``. The implementation is selected by
+``REFLEX_MARKDOWN``:
+
+* ``auto`` (default): use ``reflex_markdown_rust`` if importable; fall back
+ to ``mistletoe``.
+* ``rust``: require the Rust wheel; raise on import failure.
+* ``python``: skip the Rust wheel even if installed.
+
+The Rust path is roughly 100× faster than the legacy ``mistletoe`` path
+on Reflex-docs-sized pages — see plan §13.
+"""
+
+from __future__ import annotations
+
+import os
+from typing import Final, Literal
+
+_BACKEND_ENV: Final[str] = "REFLEX_MARKDOWN"
+
+Backend = Literal["auto", "rust", "python"]
+
+
+def selected_backend() -> Backend:
+ """Read the ``REFLEX_MARKDOWN`` env var. Defaults to ``auto``."""
+ raw = os.environ.get(_BACKEND_ENV, "auto").strip().lower()
+ if raw in ("auto", "rust", "python"):
+ return raw # type: ignore[return-value]
+ return "auto"
+
+
+def _try_rust():
+ try:
+ from reflex_markdown_rust import markdown_to_html as _rust
+
+ return _rust
+ except ImportError:
+ return None
+
+
+def _try_python():
+ try:
+ import mistletoe
+
+ return mistletoe.markdown
+ except ImportError:
+ return None
+
+
+def _resolve(backend: Backend):
+ if backend == "rust":
+ impl = _try_rust()
+ if impl is None:
+ raise RuntimeError(
+ "REFLEX_MARKDOWN=rust but the reflex_markdown_rust wheel "
+ "could not be imported."
+ )
+ return impl
+ if backend == "python":
+ impl = _try_python()
+ if impl is None:
+ raise RuntimeError(
+ "REFLEX_MARKDOWN=python but mistletoe is not installed."
+ )
+ return impl
+ # auto
+ return _try_rust() or _try_python()
+
+
+_impl = None
+
+
+def markdown_to_html(text: str) -> str:
+ """Render markdown source to HTML using the selected backend.
+
+ Args:
+ text: the markdown source.
+
+ Returns:
+ The rendered HTML.
+
+ Raises:
+ RuntimeError: if no markdown backend is available (neither Rust nor
+ mistletoe).
+ """
+ global _impl
+ if _impl is None:
+ _impl = _resolve(selected_backend())
+ if _impl is None:
+ msg = (
+ "No markdown backend available. Install reflex-markdown-rust "
+ "or mistletoe."
+ )
+ raise RuntimeError(msg)
+ return _impl(text)
+
+
+def is_rust() -> bool:
+ """Return True if the current backend is the Rust wheel."""
+ if _impl is None:
+ try:
+ markdown_to_html("")
+ except RuntimeError:
+ return False
+ rust = _try_rust()
+ return rust is not None and _impl is rust
diff --git a/reflex/compiler/rust_memo.py b/reflex/compiler/rust_memo.py
new file mode 100644
index 00000000000..f48a653252a
--- /dev/null
+++ b/reflex/compiler/rust_memo.py
@@ -0,0 +1,211 @@
+"""Memoize orchestrator for the Rust pipeline. See plan §0b lever (b3).
+
+Drives the auto-memoization pass for ``reflex run-rust``:
+
+1. Walks each page's Component tree bottom-up.
+2. For each Component, asks the Rust-side decision predicate
+ (:meth:`CompilerSession.should_memoize`) whether it should be wrapped.
+3. For candidates, calls the framework helper
+ :func:`reflex.experimental.memo.create_passthrough_component_memo` to
+ produce the wrapper Component + definition. The wrapper takes the
+ original's children (passthrough) or none (snapshot).
+4. The wrapper replaces the original in the parent's children list.
+5. Each unique memo body (keyed by ``export_name``) gets emitted via
+ :meth:`CompilerSession.compile_memo_from_component` and written to
+ ``.web/utils/components/<name>.jsx``.
+6. The transformed page tree then flows through the normal
+ :func:`compile_page_from_component` path, so the page module imports
+ ``<name>`` from ``$/utils/components/<name>`` and renders the wrapper
+ at the call site with the original children passed as JSX children.
+
+What this **does not yet match** vs the legacy
+:class:`MemoizeStatefulPlugin`:
+
+* No ``memoize_suppressor_stack`` — snapshot boundaries don't suppress
+ descendant memoization. Empirically this affects nested ``Foreach`` +
+ ``MemoizationLeaf`` subtrees; the docs app exercises a small number of
+ these. Edge case to revisit if regressions surface.
+* No ``fix_event_triggers_for_memo`` rewrite — event triggers are not
+ re-baked into the memo body. Functional impact: event handlers still
+ fire correctly; identity stability across renders is slightly worse.
+* Snapshot vs passthrough split is whatever
+ ``create_passthrough_component_memo`` produces; no explicit branch on
+ ``get_memoization_strategy``.
+
+Trade-off: the MVP orchestrator covers ~90% of real apps and skips the
+~870 ms ``_compile_memo_components`` template-render cost by using the
+Rust emit. Edge cases land iteratively.
+"""
+
+from __future__ import annotations
+
+import copy
+from collections.abc import Iterable
+from pathlib import Path
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+ from reflex.compiler.session import CompilerSession
+
+
+def walk_and_memoize(
+ component: Any,
+ session: CompilerSession,
+ memo_bodies: dict[str, Any],
+) -> Any:
+ """Walk ``component`` bottom-up, substituting memo wrappers in-place.
+
+ Args:
+ component: A Reflex ``Component`` (or anything else, in which case
+ it's returned unchanged — non-Component children carry no
+ reactive signal so they don't memoize).
+ session: The :class:`CompilerSession` whose ``should_memoize``
+ drives per-node decisions.
+ memo_bodies: Mutated. After the walk, every unique memo wrapper
+ seen is registered here as ``{export_name: body_component}``,
+ where ``body_component`` has the ``{children}`` hole
+ substituted in (passthrough wrappers) or carries the full
+ captured subtree (snapshot bodies).
+
+ Returns:
+ The (possibly wrapper-substituted) Component to splice into the
+ parent's children list.
+ """
+ from reflex_base.components.component import Component
+
+ if not isinstance(component, Component):
+ return component
+
+ # Recurse children first; wrappers may already replace deeper nodes.
+ new_children = [walk_and_memoize(c, session, memo_bodies) for c in component.children]
+ if new_children != component.children:
+ component.children = new_children
+
+ if not session.should_memoize(component):
+ return component
+
+ return _wrap_with_memo(component, memo_bodies)
+
+
+def _wrap_with_memo(component: Any, memo_bodies: dict[str, Any]) -> Any:
+ """Build the memo wrapper for ``component`` and register its body."""
+ from reflex.experimental.memo import create_passthrough_component_memo
+
+ factory, definition = create_passthrough_component_memo(component)
+ export_name = definition.export_name
+
+ if export_name not in memo_bodies:
+ body = copy.copy(definition.component)
+ if definition.passthrough_hole_child is not None:
+ body.children = [definition.passthrough_hole_child]
+ memo_bodies[export_name] = (body, definition)
+
+ wrapper = factory()
+ # Passthrough wrappers carry the original's children at the page-level
+ # call site; the memo body itself renders them through the
+ # ``{children}`` hole. Snapshot wrappers leave the children empty
+ # (the full body lives in the memo module).
+ if definition.passthrough_hole_child is not None:
+ wrapper.children = list(component.children)
+ return wrapper
+
+
+def emit_memo_modules(
+ memo_bodies: dict[str, Any],
+ session: CompilerSession,
+ components_dir: Path,
+) -> dict[str, Path]:
+ """Emit each unique memo body to ``components_dir/<name>.jsx``.
+
+ Args:
+ memo_bodies: ``{export_name: (body_component, definition)}`` map
+ built by :func:`walk_and_memoize`.
+ session: The compile session whose
+ :meth:`compile_memo_from_component` does the emit.
+ components_dir: Filesystem directory under ``.web/`` where each
+ memo file lands. Created if missing.
+
+ Returns:
+ ``{export_name: written_path}`` for every emitted memo file.
+ """
+ components_dir.mkdir(parents=True, exist_ok=True)
+ written: dict[str, Path] = {}
+ for name, (body, definition) in memo_bodies.items():
+ signature = _signature_for(definition)
+ pre_hooks = _harvest_pre_hooks(body)
+ js = session.compile_memo_from_component(
+ name, signature, body, pre_hooks=pre_hooks
+ )
+ out_path = components_dir / f"{name}.jsx"
+ out_path.write_text(js)
+ written[name] = out_path
+ return written
+
+
+def _harvest_pre_hooks(body: Any) -> str:
+ """Collect the memo body's non-trivial hooks as a rendered JS block.
+
+ The Rust ``emit_memo_module`` always emits
+ ``useContext(StateContexts.*)`` for each ``state_binding`` and
+ ``useContext(EventLoopContext)`` unconditionally. Anything else the
+ body needs (color-mode destructure, custom hook helpers from
+ ``_get_hooks_internal``, …) has to come from the framework's hook
+ harvest — port of `RUST_REWRITE_PLAN.md` task #16. Until the harvest
+ moves into ``reflex_pyread`` we lean on the legacy
+ :meth:`Component._get_all_hooks` and :func:`_render_hooks` here and
+ pass the rendered string through PyO3 for Rust to splice.
+
+ Args:
+ body: The memo body Component.
+
+ Returns:
+ The rendered hook block, with the Rust-emitted hooks filtered out
+ so nothing gets declared twice. Empty string if there's nothing
+ left after filtering.
+ """
+ from reflex_base.compiler.templates import _render_hooks
+
+ all_hooks = body._get_all_hooks()
+ filtered = {
+ hook: data
+ for hook, data in all_hooks.items()
+ if "useContext(StateContexts." not in hook
+ and "useContext(EventLoopContext)" not in hook
+ }
+ if not filtered:
+ return ""
+ return _render_hooks(filtered).strip()
+
+
+def _signature_for(definition: Any) -> str:
+ """Return the JS parameter list spliced after ``memo(`` for ``definition``.
+
+ Passthrough wrappers receive a destructured ``{ children }`` argument;
+ snapshot bodies don't see children (their full subtree lives in the
+ memo module).
+ """
+ if definition.passthrough_hole_child is not None:
+ return "({ children })"
+ return "()"
+
+
+def collect_memo_modules_for_pages(
+ pages: Iterable[tuple[str, Any]],
+ session: CompilerSession,
+) -> tuple[dict[str, Any], dict[str, Any]]:
+ """Run the memoize orchestrator over many pages.
+
+ Args:
+ pages: ``(route, root_component)`` pairs.
+ session: The compile session driving decisions + emit.
+
+ Returns:
+ ``(transformed_pages, memo_bodies)``: ``transformed_pages`` maps
+ each route to its wrapper-substituted root Component;
+ ``memo_bodies`` is the merged ``{export_name: (body, defn)}``.
+ """
+ transformed: dict[str, Any] = {}
+ memo_bodies: dict[str, Any] = {}
+ for route, root in pages:
+ transformed[route] = walk_and_memoize(root, session, memo_bodies)
+ return transformed, memo_bodies
diff --git a/reflex/compiler/rust_pipeline.py b/reflex/compiler/rust_pipeline.py
new file mode 100644
index 00000000000..221913bbff8
--- /dev/null
+++ b/reflex/compiler/rust_pipeline.py
@@ -0,0 +1,566 @@
+"""Drive the Rust compiler from inside Reflex's normal compile lifecycle.
+
+Used by:
+
+* :func:`reflex.reflex.run_rust` — the ``reflex run-rust`` CLI command.
+* :mod:`tests` — verifying the swap works on real apps.
+
+Since IR schema v2, the Rust pipeline emits **runtime-compatible** JSX
+directly:
+
+* page-level ``component_imports`` (harvested by the Rust pyread walk —
+ see plan §0b lever (a)) drive module-scope
+ ``import { … } from "<module>"`` lines;
+* page-level ``state_bindings`` drive ``useContext(StateContexts.*)`` lines;
+* page-level ``needs_ref`` drives the ``useRef`` setup;
+* the default exported function name is always ``Component`` — what the
+ Reflex React runtime imports.
+
+No Python postprocessor is required. The minimum Python that survives in
+``run-rust`` (see plan §0a) is running the user's page callables to
+materialize Component trees plus theme-style application; everything from
+"I have a Component tree" to "I have a ``.jsx`` file" lives in Rust via
+the PyO3 component reader (``reflex_pyread``).
+"""
+
+from __future__ import annotations
+
+import re
+from collections.abc import Mapping
+from pathlib import Path
+from typing import Any
+
+from reflex.compiler import utils as compiler_utils
+from reflex.compiler.rust_memo import emit_memo_modules, walk_and_memoize
+from reflex.compiler.session import CompilerSession
+
+
+def _route_to_ident(route: str) -> str:
+ """Convert a Reflex route into a JS function identifier.
+
+ ``"/"`` → ``"Index"``, ``"/about"`` → ``"About"``,
+ ``"/users/[id]"`` → ``"UsersId"``.
+ """
+ parts = re.findall(r"[A-Za-z0-9]+", route) or ["index"]
+ return "".join(p[:1].upper() + p[1:] for p in parts) or "Index"
+
+
+# Files that must exist for Vite to serve a Reflex app. If all of them are
+# present in ``.web/``, the scaffold is ready and ``run-rust`` can drive the
+# Rust pipeline straight from ``app._unevaluated_pages``.
+_SCAFFOLD_FILES: tuple[str, ...] = (
+ "package.json",
+ "vite.config.js",
+ "reflex.json",
+)
+_SCAFFOLD_DIRS: tuple[str, ...] = (
+ "app",
+ "utils",
+)
+
+
+def scaffold_exists(web_dir: Path | None = None) -> bool:
+ """Return True if ``.web/`` already has a complete Reflex scaffold.
+
+ A complete scaffold means the npm tree, vite config, and the Reflex
+ state/context/utils JS modules are all in place. That's a precondition
+ for running ``reflex run-rust`` — if the scaffold is missing, the user
+ must run ``reflex init`` / ``reflex run`` once first.
+
+ Args:
+ web_dir: Optional override; defaults to ``prerequisites.get_web_dir()``.
+
+ Returns:
+ ``True`` when every required scaffold file exists.
+ """
+ from reflex.utils.prerequisites import get_web_dir
+
+ root = Path(web_dir) if web_dir is not None else Path(get_web_dir())
+ if not root.is_dir():
+ return False
+ if not all((root / f).is_file() for f in _SCAFFOLD_FILES):
+ return False
+ return all((root / d).is_dir() for d in _SCAFFOLD_DIRS)
+
+
+def compile_pages(
+ app: Any,
+ *,
+ session: CompilerSession | None = None,
+ routes: list[str] | None = None,
+) -> tuple[dict[str, Path], Mapping[str, list]]:
+ """Compile every registered page through the Rust pipeline.
+
+ Each page goes through:
+
+ 1. :func:`reflex.compiler.compiler.compile_unevaluated_page` — Python
+ evaluates the page callable, applies recursive theme styles, wraps
+ in ``Fragment`` with title + meta. This is the only step Rust can't
+ do — it's running user Python that builds the Component tree.
+ 2. :meth:`CompilerSession.compile_page_from_component` — Rust pyread
+ walks the Component tree via PyO3 and emits JSX in one pass.
+ 3. Write the result to ``.web/app/routes/*.jsx``.
+
+ Alongside JSX emission the function also harvests each evaluated
+ page's ``_get_all_imports()`` so callers can hand the merged set to
+ :meth:`App._get_frontend_packages` and trigger ``bun install`` without
+ running the legacy plugin chain.
+
+ Memoize: per plan §0b lever (b3),
+ :func:`reflex.compiler.rust_memo.walk_and_memoize` substitutes memo
+ wrappers into each page tree before pyread + emit; unique memo
+ bodies are written to ``.web/utils/components/<name>.jsx``. This is
+ an MVP — see :mod:`reflex.compiler.rust_memo` for the known gaps vs
+ the legacy :class:`MemoizeStatefulPlugin`.
+
+ Args:
+ app: a loaded ``rx.App`` whose ``_unevaluated_pages`` is populated.
+ session: existing :class:`CompilerSession`. A fresh one is created
+ if omitted.
+ routes: restrict the compile to these routes. ``None`` (default)
+ compiles every registered page.
+
+ Returns:
+ ``(written, imports)`` — ``written`` maps each compiled route to
+ the path of the emitted JSX file; ``imports`` is the merged
+ ``ParsedImportDict`` for the whole compile, suitable to pass to
+ :meth:`App._get_frontend_packages`.
+ """
+ from reflex.compiler import compiler as legacy_compiler
+ from reflex.compiler import utils as legacy_utils
+ from reflex.compiler.compiler import (
+ _apply_common_imports,
+ _normalize_library_name,
+ _resolve_app_wrap_components,
+ _resolve_radix_themes_plugin,
+ compile_unevaluated_page,
+ )
+ from reflex_base.compiler.templates import _RenderUtils, _render_hooks
+ from reflex_base.components.dynamic import bundled_libraries
+ from reflex_base.config import get_config
+
+ sess = session or CompilerSession()
+
+ # The legacy ``compile_app`` calls ``bundle_library`` for every
+ # plugin's ``get_frontend_dependencies()`` so dynamically-loaded
+ # libraries end up in ``bundled_libraries`` (which feeds ``root.jsx``'s
+ # `window["__reflex"]` mapping). Mirror that side effect so the
+ # window-library list matches.
+ from reflex_base.components.dynamic import bundle_library, reset_bundled_libraries
+
+ reset_bundled_libraries()
+ _, _radix_for_bundle = _resolve_radix_themes_plugin(app, get_config().plugins)
+ for plugin in (*get_config().plugins, _radix_for_bundle):
+ for dep in plugin.get_frontend_dependencies():
+ bundle_library(dep)
+
+ # `@rx.page` decorators populate the ``DECORATED_PAGES`` registry but
+ # only get applied to the app inside ``App._compile``. We mimic that
+ # here so the "/" route (and any other decorator-registered routes)
+ # show up in ``_unevaluated_pages``. Also ensure the 404 page slug
+ # is registered — the legacy compile auto-adds it if missing.
+ from reflex_base import constants as base_constants
+
+ app._apply_decorated_pages()
+ if base_constants.Page404.SLUG not in app._unevaluated_pages:
+ app.add_page(route=base_constants.Page404.SLUG)
+
+ written: dict[str, Path] = {}
+ all_imports: dict[str, list] = {}
+ memo_bodies: dict[str, Any] = {}
+ collected_app_wraps: dict[tuple[int, str], Any] = {}
+ stateful_routes: list[str] = []
+ for route, unev in app._unevaluated_pages.items():
+ if routes is not None and route not in routes:
+ continue
+
+ # ``compile_unevaluated_page`` evaluates the page callable, applies
+ # recursive theme styles, and wraps the root in ``Fragment`` with
+ # ``<title>``/``<meta>`` already attached. The bridge sees the wrapped
+ # tree and emits the metadata via the IR's component nodes, so we
+ # pass ``title=None``/``meta_tags=None`` to ``page_to_ir`` to avoid
+ # double-emitting.
+ from reflex.state import all_base_state_classes
+
+ n_states_before = len(all_base_state_classes)
+ component = compile_unevaluated_page(route, unev, app.style, app.theme)
+ if len(all_base_state_classes) > n_states_before:
+ # Statefulness detection: matches the legacy plugin
+ # (``compile.py:_PageCompiler.compile``) which marks any
+ # page whose evaluation registered a new ``BaseState``
+ # subclass.
+ stateful_routes.append(route)
+
+ # Harvest imports BEFORE memoize substitution: the Rust walker
+ # mirrors ``_get_all_imports`` (children + ``_get_components_in_props``)
+ # so wrappers haven't yet replaced anything. We need the union so
+ # ``bun install`` still pulls in every npm package the original
+ # components reference. ``collect_all_imports_into`` mutates
+ # ``all_imports`` in place — the previous
+ # ``merge_imports(all_imports, ...)`` pattern rebuilt the dict
+ # once per page and was O(N²) in cumulative page count.
+ sess.collect_all_imports_into(all_imports, component)
+
+ # Harvest app-wrap contributions from every component (Radix
+ # ColorMode provider, theme wrap, toaster, etc.). The legacy
+ # compile gathers these via `compile_ctx.app_wrap_components`
+ # during the plugin walk; we walk the evaluated trees ourselves
+ # so `_resolve_app_wrap_components` later produces the full
+ # wrapper set.
+ collected_app_wraps.update(component._get_all_app_wrap_components())
+
+
+ # Memoize: substitute wrappers in-place; track each unique memo
+ # body for separate emission below.
+ component = walk_and_memoize(component, sess, memo_bodies)
+
+ ident = _route_to_ident(route)
+
+ # Harvest custom-code blocks + render hooks for this page —
+ # mirrors what the legacy `page_template` splices via
+ # `_get_all_custom_code()` + `_render_hooks()`. Without this the
+ # rust-emitted page is missing helpers like the markdown
+ # ``ComponentMap_*`` closure.
+ page_custom_code = list(component._get_all_custom_code())
+ page_hooks_body = _render_hooks(component._get_all_hooks())
+ rust_js = sess.compile_page_from_component(
+ ident,
+ component,
+ route,
+ custom_code=page_custom_code,
+ hooks_body=page_hooks_body,
+ )
+
+ out_path = Path(compiler_utils.get_page_path(route))
+ out_path.parent.mkdir(parents=True, exist_ok=True)
+ out_path.write_text(rust_js)
+ written[route] = out_path
+
+ # Emit each unique memo body as its own module file. Also harvest
+ # each body's imports for the ``bun install`` step.
+ components_dir = Path(compiler_utils.get_memo_components_dir())
+ for _name, (body, _definition) in memo_bodies.items():
+ sess.collect_all_imports_into(all_imports, body)
+ emit_memo_modules(memo_bodies, sess, components_dir)
+
+ # Emit `app/root.jsx` — the React Router root module. Python
+ # composes the app-wrap chain + renders all the dynamic strings the
+ # legacy `app_root_template` expects (imports, hooks, render JSX,
+ # window libs); Rust assembles the template.
+ # The radix-themes plugin's `compile_page` hook adds the `(20,"Theme")`
+ # wrap per page during the legacy compile. We skip the plugin walk
+ # but still need the wrap, so add it directly here.
+ _, radix_themes_plugin = _resolve_radix_themes_plugin(app, get_config().plugins)
+ if radix_themes_plugin.enabled and radix_themes_plugin.theme is not None:
+ collected_app_wraps[20, "Theme"] = radix_themes_plugin.theme
+
+ app_wrappers = _resolve_app_wrap_components(app, collected_app_wraps)
+ app_root = app._app_root(app_wrappers)
+ sess.collect_all_imports_into(all_imports, app_root)
+
+ # Harvest imports from every ``@rx.memo`` custom component for the
+ # install step AND emit each component's standalone memo file —
+ # sonner / moment / marquee / inkeep / hast-util-to-string all live
+ # in custom-component bodies. Must run *after*
+ # ``_resolve_app_wrap_components`` since that's where
+ # ``memoized_toast_provider`` lazily registers itself in
+ # ``CUSTOM_COMPONENTS``.
+ #
+ # Without re-emitting the per-component files every run, stale
+ # ``.web/utils/components/<Name>.jsx`` produced by an older legacy
+ # compile would persist — and any Python-side change to the
+ # component would leave the on-disk JSX out of sync.
+ from reflex_base.components.component import CUSTOM_COMPONENTS
+
+ memo_files, _aggregate_imports = legacy_compiler._compile_memo_components(
+ dict.fromkeys(CUSTOM_COMPONENTS.values()),
+ (),
+ )
+ for raw_path, code in memo_files:
+ _write(str(legacy_utils.resolve_path_of_web_dir(raw_path)), code)
+
+ for component in dict.fromkeys(CUSTOM_COMPONENTS.values()):
+ try:
+ _, custom_imports = compiler_utils.compile_custom_component(component)
+ except Exception:
+ continue
+ sess.merge_imports_into(all_imports, custom_imports)
+
+ app_root_imports = app_root._get_all_imports()
+ _apply_common_imports(app_root_imports)
+ imports_str = "\n".join(
+ _RenderUtils.get_import(m)
+ for m in compiler_utils.compile_imports(app_root_imports)
+ )
+
+ custom_code_str = "\n".join(app_root._get_all_custom_code())
+ hooks_str = _render_hooks(app_root._get_all_hooks())
+ render_str = _RenderUtils.render(app_root.render())
+ dynamic_imports_str = "\n".join(app_root._get_all_dynamic_imports())
+
+ window_libraries = list(
+ dict.fromkeys(
+ (_normalize_library_name(name), name) for name in bundled_libraries
+ )
+ )
+ import_window_libraries = "\n".join(
+ f'import * as {alias} from "{path}";' for alias, path in window_libraries
+ )
+ window_imports_str = "\n".join(
+ f' "{path}": {alias},' for alias, path in window_libraries
+ )
+
+ root_path = str(
+ Path(compiler_utils.get_web_dir())
+ / base_constants.Dirs.PAGES
+ / base_constants.PageNames.APP_ROOT
+ )
+ Path(root_path).parent.mkdir(parents=True, exist_ok=True)
+ sess.compile_app_root_module(
+ imports_str,
+ dynamic_imports_str,
+ custom_code_str,
+ hooks_str,
+ render_str,
+ import_window_libraries,
+ window_imports_str,
+ root_path,
+ )
+ # NB: deliberately not added to `written` — that map is the
+ # route → page-file mapping the caller uses for status output, and
+ # root.jsx isn't a route.
+
+ # Emit remaining static artifacts the React Router app needs at
+ # startup: state contexts, document root, theme, root stylesheet,
+ # memo index, and the backend stateful-pages marker. All of these
+ # have plugin-walk-free Python emitters we can call directly until
+ # they're ported to Rust. See ``scripts/diff_legacy_vs_rust.py`` for
+ # the inventory of what's still missing vs the legacy compile.
+ _emit_static_artifacts(app, sess, stateful_routes=stateful_routes)
+
+ return written, all_imports
+
+
+def _emit_static_artifacts(
+ app: Any, sess: CompilerSession, *, stateful_routes: list[str] | None = None
+) -> None:
+ """Emit the non-page static files the React Router app needs at boot.
+
+ The Rust-emitted artifacts go through ``sess.compile_*`` methods
+ that stream bytes to disk via ``BufWriter<File>`` — no intermediate
+ Python string. The remaining Python-emitter calls are placeholders
+ for ports that aren't done yet (``context_template``,
+ ``document_root_template``, ``app_root_template``,
+ ``styles_template`` — the last one needs the SASS / file-resolution
+ refactor in ``_compile_root_stylesheet`` first).
+ """
+ import json
+
+ from reflex_base.components.component import (
+ CUSTOM_COMPONENTS,
+ evaluate_style_namespaces,
+ )
+ from reflex_base.config import get_config
+ from reflex_base.constants import Dirs
+ from reflex_base.vars.base import LiteralVar
+
+ from reflex_base import constants as base_constants
+ from reflex_base.compiler.templates import _RenderUtils, _render_hooks
+ from reflex_base.utils.format import json_dumps
+
+ from reflex.compiler import compiler as legacy_compiler
+ from reflex.compiler import utils as legacy_utils
+ from reflex.compiler.compiler import (
+ SYSTEM_COLOR_MODE,
+ _normalize_library_name,
+ _resolve_radix_themes_plugin,
+ _resolve_root_stylesheets,
+ )
+ from reflex.utils.exec import is_prod_mode
+ from reflex.utils.prerequisites import get_backend_dir
+
+ config = get_config()
+ app.style = evaluate_style_namespaces(app.style)
+
+ compiler_plugins, radix_themes_plugin = _resolve_radix_themes_plugin(
+ app, config.plugins
+ )
+ radix_theme = radix_themes_plugin.get_theme()
+
+ # ---- utils/context.js (Rust) -----------------------------------------
+ # Python still computes the dict inputs (initial state via Pydantic
+ # serialization, client storage via a state walk); Rust assembles
+ # the template and writes the file. Matches the legacy
+ # `_compile_contexts` flow.
+ state_root = app._state
+ appearance = getattr(radix_theme, "appearance", None)
+ if appearance is None or str(LiteralVar.create(appearance)) == '"inherit"':
+ appearance = LiteralVar.create(SYSTEM_COLOR_MODE)
+ default_color_mode_js = str(appearance)
+ is_dev = not is_prod_mode()
+ if state_root is not None:
+ initial_state = legacy_utils.compile_state(state_root)
+ state_name_full = state_root.get_name()
+ client_storage = legacy_utils.compile_client_storage(state_root)
+ state_keys = list(initial_state.keys())
+ initial_state_json = json_dumps(initial_state)
+ client_storage_json = json.dumps(client_storage)
+ else:
+ state_name_full = None
+ state_keys = []
+ initial_state_json = "{}"
+ client_storage_json = "{}"
+ ctx_path = legacy_utils.get_context_path()
+ Path(ctx_path).parent.mkdir(parents=True, exist_ok=True)
+ sess.compile_context_module(
+ is_dev,
+ default_color_mode_js,
+ state_name_full,
+ state_keys,
+ initial_state_json,
+ client_storage_json,
+ ctx_path,
+ )
+
+ # ---- app/_document.js (Rust — Python pre-renders the dynamic strings)
+ document_root = legacy_utils.create_document_root(
+ app.head_components,
+ html_lang=app.html_lang,
+ html_custom_attrs=(
+ {"suppressHydrationWarning": True, **app.html_custom_attrs}
+ if app.html_custom_attrs
+ else {"suppressHydrationWarning": True}
+ ),
+ )
+ doc_imports = document_root._get_all_imports()
+ legacy_compiler._apply_common_imports(doc_imports)
+ doc_imports_str = "\n".join(
+ _RenderUtils.get_import(m) for m in legacy_utils.compile_imports(doc_imports)
+ )
+ doc_render_str = _RenderUtils.render(document_root.render())
+ doc_path = str(
+ Path(compiler_utils.get_web_dir())
+ / base_constants.Dirs.PAGES
+ / base_constants.PageNames.DOCUMENT_ROOT
+ )
+ Path(doc_path).parent.mkdir(parents=True, exist_ok=True)
+ sess.compile_document_root_module(doc_imports_str, doc_render_str, doc_path)
+
+ # ---- styles/root stylesheet (Rust) -----------------------------------
+ # Python still owns the user-stylesheet resolution + SASS compile
+ # (filesystem-heavy, libsass dep) via ``_resolve_root_stylesheets``;
+ # Rust just emits the final ``@layer`` + ``@import`` template.
+ sheets = _resolve_root_stylesheets(
+ app.stylesheets, app.reset_style, plugins=compiler_plugins
+ )
+ style_path = legacy_utils.get_root_stylesheet_path()
+ Path(style_path).parent.mkdir(parents=True, exist_ok=True)
+ sess.compile_styles_root(sheets, style_path)
+
+ # ---- utils/theme.js (Rust) -------------------------------------------
+ theme_component = legacy_utils.create_theme(app.style)
+ theme_js = str(LiteralVar.create(theme_component))
+ theme_path = legacy_utils.get_theme_path()
+ Path(theme_path).parent.mkdir(parents=True, exist_ok=True)
+ sess.compile_theme_module(theme_js, theme_path)
+
+ # ---- utils/components.jsx — memo index (Rust) ------------------------
+ index_entries: list[tuple[str, str]] = []
+ for component in dict.fromkeys(CUSTOM_COMPONENTS.values()):
+ try:
+ render, _ = compiler_utils.compile_custom_component(component)
+ except Exception:
+ continue
+ name = render["name"]
+ index_entries.append((name, legacy_compiler._memo_component_index_specifier(name)))
+ index_path = compiler_utils.get_components_path()
+ Path(index_path).parent.mkdir(parents=True, exist_ok=True)
+ sess.compile_memo_index(index_entries, index_path)
+
+ # ---- Plugin save tasks (Tailwind config + root style, etc.) ----------
+ # Plugins' ``pre_compile`` hook collects "save tasks" — closures that
+ # produce ``(path, code)`` tuples for files like ``tailwind.config.js``
+ # and ``tailwind.css``. We can't avoid running pre_compile because
+ # plugin output is config-dependent (Tailwind scans pages for classes,
+ # for example); doing it inline matches the legacy ``compile_app``
+ # plugin walk.
+ save_tasks: list[tuple] = []
+ modify_tasks: list[tuple[str, str, Any]] = []
+
+ def _add_save_task(task_fn, *args, **kwargs):
+ save_tasks.append((task_fn, args, kwargs))
+
+ def _make_add_modify_task(plugin):
+ plugin_name = plugin.__class__.__module__ + plugin.__class__.__name__
+
+ def _add_modify_task(file_path, modify_fn):
+ modify_tasks.append((plugin_name, file_path, modify_fn))
+
+ return _add_modify_task
+
+ for plugin in compiler_plugins:
+ plugin.pre_compile(
+ add_save_task=_add_save_task,
+ add_modify_task=_make_add_modify_task(plugin),
+ radix_themes_plugin=radix_themes_plugin,
+ unevaluated_pages=list(app._unevaluated_pages.values()),
+ )
+
+ # Collect save-task outputs into an ``output_mapping`` first so
+ # ``modify_files_tasks`` can transform them in memory before flushing.
+ # Matches the legacy ``compile_app`` ordering (save then modify then
+ # write) — otherwise a modify-task that depends on the modified file
+ # already being on disk would lose changes.
+ output_mapping: dict[Path, str] = {}
+ for task_fn, args, kwargs in save_tasks:
+ result = task_fn(*args, **kwargs)
+ if result is None:
+ continue
+ results = result if isinstance(result, list) else [result]
+ for raw_path, code in results:
+ resolved = legacy_utils.resolve_path_of_web_dir(raw_path)
+ output_mapping[resolved] = code
+
+ for plugin_name, file_path, modify_fn in modify_tasks:
+ path = legacy_utils.resolve_path_of_web_dir(file_path)
+ content = output_mapping.get(path)
+ if content is None:
+ if path.exists():
+ content = path.read_text()
+ else:
+ msg = (
+ f"Plugin {plugin_name} tried to modify {path} but it "
+ "does not exist."
+ )
+ raise FileNotFoundError(msg)
+ output_mapping[path] = modify_fn(content)
+
+ for path, code in output_mapping.items():
+ _write(str(path), code)
+
+ # ---- backend/stateful_pages.json (Rust) ------------------------------
+ # ``stateful_routes`` is computed during the page-evaluation loop in
+ # ``compile_pages`` via ``bridge._collect_state_bindings`` — that
+ # returns the ``StateContexts.*`` keys each page references, which
+ # matches the legacy plugin's "compiling this page introduced a new
+ # BaseState" heuristic. Falls back to ``app._stateful_pages`` if not
+ # provided (kept for callers that drive ``_emit_static_artifacts``
+ # directly).
+ backend_dir = Path(get_backend_dir())
+ backend_dir.mkdir(parents=True, exist_ok=True)
+ routes_list = (
+ list(stateful_routes)
+ if stateful_routes is not None
+ else list(getattr(app, "_stateful_pages", []))
+ )
+ sess.compile_stateful_pages_marker(
+ routes_list,
+ str(backend_dir / Dirs.STATEFUL_PAGES),
+ )
+
+
+def _write(path: str, code: str) -> None:
+ """Write a compile-output ``(path, code)`` tuple to disk."""
+ p = Path(path)
+ p.parent.mkdir(parents=True, exist_ok=True)
+ p.write_text(code)
diff --git a/reflex/compiler/session.py b/reflex/compiler/session.py
new file mode 100644
index 00000000000..b0d53aab8b9
--- /dev/null
+++ b/reflex/compiler/session.py
@@ -0,0 +1,448 @@
+"""Python wrapper around the Rust ``CompilerSession``.
+
+The Rust side (``reflex_compiler_rust._native.CompilerSession``) holds the
+content-hash compile cache. This wrapper handles:
+
+* A friendly error when the wheel can't be imported.
+* Conversion of :mod:`reflex.compiler.ir.builder` lists to msgpack bytes
+ (used by tests and benchmarks that still build IR through the Python
+ helpers).
+
+The supported caller path is :meth:`CompilerSession.compile_page_from_component`
+— the Rust pyread walk over a Component PyObject (plan §0b lever (a)).
+The IR-bytes entry points (:meth:`compile_page_ir`, :meth:`compile_app_ir`)
+remain available for the codegen-corpus IR-shape tests.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Iterable, Sequence
+
+from reflex.compiler.ir import pack
+
+_WHEEL_MISSING = (
+ "reflex_compiler_rust wheel not available — install it via "
+ "`maturin develop --release` in packages/reflex-compiler-rust."
+)
+
+
+class CompilerSession:
+ """Long-lived compiler handle. Shared across hot-reloads.
+
+ Constructing this is cheap (no compile work happens). The expensive piece
+ is the underlying Rust ``CompilerSession`` which holds the content-hash
+ cache across calls to :meth:`compile_page` / :meth:`compile_app`.
+ """
+
+ def __init__(self) -> None:
+ try:
+ from reflex_compiler_rust import _native
+ except ImportError as exc:
+ raise RuntimeError(_WHEEL_MISSING) from exc
+ self._inner = _native.CompilerSession()
+
+ # ---- Cache controls -----------------------------------------------------
+
+ def set_cache_capacity(self, cap: int | None) -> None:
+ """Bound the in-process page-render cache. ``None`` for unbounded."""
+ self._inner.set_cache_capacity(cap)
+
+ def clear_cache(self) -> None:
+ self._inner.clear_cache()
+
+ def cache_len(self) -> int:
+ return int(self._inner.cache_len())
+
+ # ---- Compile entry points ----------------------------------------------
+
+ def compile_page_ir(self, route_ident: str, page_ir: list) -> str:
+ """Compile a pre-built IR tree to a JS source string.
+
+ Args:
+ route_ident: JS function name for the page module.
+ page_ir: the list-of-lists IR from :mod:`reflex.compiler.ir.builder`.
+
+ Returns:
+ Rendered JS source for the page module.
+ """
+ return self.compile_page_bytes(route_ident, pack.pack_page(page_ir))
+
+ def compile_page_bytes(self, route_ident: str, page_bytes: bytes) -> str:
+ """Compile pre-packed IR bytes to a JS source string."""
+ return str(self._inner.compile_page(route_ident, page_bytes))
+
+ def compile_page_with_sourcemap(
+ self, route_ident: str, page_ir: list
+ ) -> tuple[str, list[tuple[int, int, int, int]]]:
+ """Compile an IR tree and return ``(js, mappings)``.
+
+ Each mapping is ``(byte_offset, file_id, line, col)``. The cache is
+ bypassed — use this for diagnostic flows, not hot-reload.
+
+ Args:
+ route_ident: JS function name for the page module.
+ page_ir: the list-of-lists IR from :mod:`reflex.compiler.ir.builder`.
+
+ Returns:
+ ``(js, mappings)``.
+ """
+ js, mappings = self._inner.compile_page_with_sourcemap(
+ route_ident, pack.pack_page(page_ir)
+ )
+ return str(js), [tuple(m) for m in mappings]
+
+ def compile_memo_from_component(
+ self,
+ name: str,
+ signature: str,
+ component: object,
+ *,
+ route: str = "/__memo__",
+ pre_hooks: str = "",
+ ) -> str:
+ """Compile a memo wrapper module from a Component PyObject.
+
+ Mirrors :func:`reflex_base.compiler.templates.memo_single_component_template`
+ (plan §0b lever (b3)). The Component is expected to already carry
+ the ``{children}`` hole at the Python level (a passthrough wrapper
+ is e.g. ``rx.box(rx.text(children=...))`` where ``children`` is a
+ ``Var(_js_expr='children')`` — see
+ :func:`reflex.experimental.memo.create_passthrough_component_memo`).
+
+ Args:
+ name: exported memo identifier.
+ signature: parameter list spliced after ``memo(``. Use
+ ``"{ children }"`` for passthrough wrappers, ``"()"`` for
+ snapshot bodies.
+ component: the wrapper-component (already hole-substituted).
+ route: route value for the harvest pass; defaults to a
+ synthetic ``"/__memo__"`` since memos don't have routes.
+ pre_hooks: pre-rendered hook block (e.g.
+ ``const { resolvedColorMode } = useContext(ColorModeContext)``)
+ the Python orchestrator harvested from the memo body via
+ ``_get_all_hooks()``. Spliced between the state-context
+ hooks and ``return`` inside the memo body. The Rust
+ ``state_bindings`` + ``EventLoopContext`` lines are still
+ emitted unconditionally; the caller must filter those
+ hooks out of ``pre_hooks`` to avoid double-declarations.
+
+ Returns:
+ Rendered JS source for the memo module.
+ """
+ return str(
+ self._inner.compile_memo_from_component(
+ name, signature, component, route, pre_hooks
+ )
+ )
+
+ def compile_memo_index(
+ self, reexports: list[tuple[str, str]], out_path: str
+ ) -> None:
+ """Write the memo index module (``.web/utils/components.jsx``).
+
+ Mirrors :func:`reflex_base.compiler.templates.memo_index_template`
+ — the small barrel file that re-exports each ``@rx.memo`` custom
+ component so ``root.jsx`` can pull them in via
+ ``$/utils/components``. The Rust side builds the content and
+ writes it to ``out_path`` in one PyO3 call.
+
+ Args:
+ reexports: list of ``(export_name, relative_module_specifier)``
+ tuples; e.g. ``("Foo", "components/Foo")`` produces
+ ``export { Foo } from "components/Foo";``.
+ out_path: absolute filesystem path the index gets written
+ to. Parent directory must already exist.
+ """
+ self._inner.compile_memo_index(list(reexports), out_path)
+
+ def compile_styles_root(self, stylesheets: list[str], out_path: str) -> None:
+ """Write ``.web/styles/styles.css``.
+
+ Ports :func:`reflex_base.compiler.templates.styles_template`.
+
+ Args:
+ stylesheets: stylesheet URLs spliced into ``@import url(...)``
+ lines under the single ``@layer __reflex_base;`` header.
+ out_path: absolute filesystem path.
+ """
+ self._inner.compile_styles_root(list(stylesheets), out_path)
+
+ def compile_theme_module(self, theme_js: str, out_path: str) -> None:
+ """Write ``.web/utils/theme.js``.
+
+ Ports :func:`reflex_base.compiler.templates.theme_template`. The
+ ``theme_js`` argument is the JS object literal Python derives
+ from the theme dict via ``LiteralVar.create(theme)``.
+
+ Args:
+ theme_js: the JS expression that becomes the default export.
+ out_path: absolute filesystem path.
+ """
+ self._inner.compile_theme_module(theme_js, out_path)
+
+ def compile_app_root_module(
+ self,
+ imports_str: str,
+ dynamic_imports_str: str,
+ custom_code_str: str,
+ hooks_str: str,
+ render_str: str,
+ import_window_libraries: str,
+ window_imports_str: str,
+ out_path: str,
+ ) -> None:
+ """Write ``.web/app/root.jsx``.
+
+ Ports :func:`reflex_base.compiler.templates.app_root_template`.
+ Python pre-renders the dynamic strings (the legacy JSX renderer
+ + hooks renderer); Rust splices them into the static layout.
+
+ Args:
+ imports_str: rendered ``import …`` lines joined with ``\\n``.
+ dynamic_imports_str: rendered dynamic-import statements
+ joined with ``\\n``.
+ custom_code_str: user-contributed top-level code.
+ hooks_str: rendered hook body.
+ render_str: rendered JSX expression for the app-wrap chain.
+ import_window_libraries: rendered
+ ``import * as <alias> from "…"`` lines.
+ window_imports_str: rendered ``"<path>": <alias>,`` entries.
+ out_path: absolute filesystem path.
+ """
+ self._inner.compile_app_root_module(
+ imports_str,
+ dynamic_imports_str,
+ custom_code_str,
+ hooks_str,
+ render_str,
+ import_window_libraries,
+ window_imports_str,
+ out_path,
+ )
+
+ def compile_document_root_module(
+ self,
+ imports_str: str,
+ document_render_str: str,
+ out_path: str,
+ ) -> None:
+ """Write ``.web/app/_document.js``.
+
+ Ports :func:`reflex_base.compiler.templates.document_root_template`.
+
+ Args:
+ imports_str: rendered ``import …`` lines joined with ``\\n``.
+ document_render_str: rendered JSX expression for the
+ document tree.
+ out_path: absolute filesystem path.
+ """
+ self._inner.compile_document_root_module(
+ imports_str, document_render_str, out_path
+ )
+
+ def compile_context_module(
+ self,
+ is_dev_mode: bool,
+ default_color_mode_js: str,
+ state_name: str | None,
+ state_keys: list[str],
+ initial_state_json: str,
+ client_storage_json: str,
+ out_path: str,
+ ) -> None:
+ """Write ``.web/utils/context.js``.
+
+ Ports :func:`reflex_base.compiler.templates.context_template`.
+ Python pre-serializes the dict inputs (``initial_state``,
+ ``client_storage``); Rust assembles the template and writes the
+ module.
+
+ Args:
+ is_dev_mode: emitted as ``export const isDevMode = …``.
+ default_color_mode_js: the JS expression assigned to
+ ``defaultColorMode`` (a quoted string or a runtime lookup).
+ state_name: full dotted name of the state root; ``None`` for
+ the no-state fallback.
+ state_keys: full dotted names of every state context.
+ initial_state_json: pre-serialized initial-state dict
+ (``json_dumps``).
+ client_storage_json: pre-serialized client-storage config
+ (``json.dumps``).
+ out_path: absolute filesystem path.
+ """
+ self._inner.compile_context_module(
+ is_dev_mode,
+ default_color_mode_js,
+ state_name,
+ list(state_keys),
+ initial_state_json,
+ client_storage_json,
+ out_path,
+ )
+
+ def compile_stateful_pages_marker(self, routes: list[str], out_path: str) -> None:
+ """Write ``.web/backend/stateful_pages.json``.
+
+ Mirrors :meth:`App._write_stateful_pages_marker`. Python decides
+ which routes are stateful; Rust serializes the list as JSON and
+ writes the file.
+
+ Args:
+ routes: stateful route strings (no leading slash).
+ out_path: absolute filesystem path.
+ """
+ self._inner.compile_stateful_pages_marker(list(routes), out_path)
+
+ def should_memoize(self, component: object) -> bool:
+ """Run the Rust memoize-decision walk on a Reflex ``Component``.
+
+ Mirrors :func:`reflex.compiler.plugins.memoize._should_memoize`
+ — plan §0a phase 2 / §0b lever (b2). Behavior-identical with
+ the legacy predicate (parity-tested in
+ ``tests/units/compiler/test_memoize_plugin.py``).
+
+ Args:
+ component: a ``reflex_base.components.component.BaseComponent``.
+
+ Returns:
+ ``True`` iff the component is a memoization candidate.
+ """
+ return bool(self._inner.should_memoize(component))
+
+ def collect_all_imports(self, component: object) -> dict[str, list]:
+ """Rust-merged equivalent of ``Component._get_all_imports()``.
+
+ Walks the Component tree (children + ``_get_components_in_props``),
+ calls each node's cached ``_get_imports()``, and merges in a Rust
+ ``HashMap`` — drop-in replacement for the Python recursion that
+ dominates ``rust_pipeline.compile_pages`` time on import-heavy
+ trees.
+
+ The return shape matches ``_get_all_imports`` exactly:
+ ``dict[str, list[ImportVar]]`` with no ``$/utils/...`` prefix
+ transform. Callers wrap in
+ :func:`reflex.compiler.utils.merge_imports` for that step.
+
+ Args:
+ component: any ``reflex_base.components.component.BaseComponent``.
+
+ Returns:
+ The merged ``ParsedImportDict``.
+ """
+ return self._inner.collect_all_imports(component)
+
+ def collect_all_imports_into(
+ self, target: dict[str, list], component: object
+ ) -> None:
+ """In-place variant of :meth:`collect_all_imports`.
+
+ Walks ``component``'s tree and appends every entry into
+ ``target`` with the ``merge_imports`` ``$/utils/...`` prefix
+ transform applied. Use this when accumulating across many
+ Components (the ``compile_pages`` page + memo-body loop) so the
+ caller doesn't pay the O(N²) cost of rebuilding the outer dict
+ on each iteration via Python ``merge_imports``.
+
+ Args:
+ target: existing ``ParsedImportDict`` to merge into.
+ component: any ``reflex_base.components.component.BaseComponent``.
+ """
+ self._inner.collect_all_imports_into(target, component)
+
+ def last_phase_timings_ns(self) -> dict[str, int]:
+ """Snapshot the Rust per-phase timings from the most recent compile.
+
+ Counters reset at the start of every ``read_page``. Returns
+ nanosecond totals keyed by phase name; see the Rust-side doc on
+ ``CompilerSession.last_phase_timings_ns`` for the exact phases.
+
+ Returns:
+ ``dict[phase_name, ns_total]`` snapshot.
+ """
+ return self._inner.last_phase_timings_ns()
+
+ def merge_imports_into(
+ self, target: dict[str, list], source: dict[str, list]
+ ) -> None:
+ """Apply the ``merge_imports`` prefix transform to ``source`` in place.
+
+ Same library-prefix rewrite as
+ :func:`reflex.compiler.utils.merge_imports` but with no per-entry
+ ``isinstance`` dispatch — callers must pass a pre-normalized
+ ``ParsedImportDict`` (e.g. from ``parse_imports`` or
+ ``_get_all_imports``).
+
+ Args:
+ target: existing ``ParsedImportDict`` to merge into.
+ source: ``ParsedImportDict`` whose entries get appended.
+ """
+ self._inner.merge_imports_into(target, source)
+
+ def compile_page_from_component(
+ self,
+ route_ident: str,
+ component: object,
+ route: str,
+ *,
+ title: str | None = None,
+ meta_tags: list[tuple[str, str]] | None = None,
+ custom_code: list[str] | None = None,
+ hooks_body: str | None = None,
+ ) -> str:
+ """Compile a page directly from a Reflex ``Component`` PyObject.
+
+ The Rust side walks the Component tree via PyO3 ``getattr``
+ (``reflex_pyread``, plan §0b lever (a)) and emits JSX in one pass.
+ No msgpack hop.
+
+ Args:
+ route_ident: JS function name for the page module.
+ component: a ``reflex_base.components.component.BaseComponent``.
+ route: URL path served by the page.
+ title: optional document title.
+ meta_tags: optional ``[(name_or_property, content), …]``.
+ custom_code: optional component-contributed code blocks
+ (``_get_all_custom_code()``) spliced between the import
+ section and the ``export default function`` line.
+ hooks_body: optional pre-rendered hooks block inserted into
+ the component function body after the
+ ``useContext(EventLoopContext)`` line.
+
+ Returns:
+ Rendered JS source for the page module.
+ """
+ meta = list(meta_tags) if meta_tags else None
+ return str(
+ self._inner.compile_page_from_component(
+ route_ident,
+ component,
+ route,
+ title,
+ meta,
+ list(custom_code) if custom_code else None,
+ hooks_body,
+ )
+ )
+
+ def compile_app_ir(
+ self,
+ pages: Iterable[tuple[str, str, list]],
+ *,
+ theme: list | None = None,
+ global_state: list | None = None,
+ plugin_manifest: list | None = None,
+ ) -> object:
+ """Compile a whole app from IR. Returns the Rust ``CompiledOutput``."""
+ packed_pages: Sequence[tuple[str, str, bytes]] = [
+ (ident, route, pack.pack_page(page_ir)) for ident, route, page_ir in pages
+ ]
+ return self._inner.compile_app(
+ packed_pages,
+ theme=pack.pack_theme(theme) if theme is not None else None,
+ global_state=pack.pack_global_state(global_state)
+ if global_state is not None
+ else None,
+ plugin_manifest=pack.pack_plugin_manifest(plugin_manifest)
+ if plugin_manifest is not None
+ else None,
+ )
diff --git a/reflex/reflex.py b/reflex/reflex.py
index 7fd181f8568..3eb3be95886 100644
--- a/reflex/reflex.py
+++ b/reflex/reflex.py
@@ -2,6 +2,7 @@
from __future__ import annotations
+import os
from importlib.util import find_spec
from pathlib import Path
from typing import TYPE_CHECKING
@@ -12,6 +13,7 @@
from reflex_base.environment import environment
from reflex_base.utils import console
from reflex_cli.v2.deployments import hosting_cli
+from rich import markup
from reflex.custom_components.custom_components import custom_components_cli
@@ -491,6 +493,195 @@ def compile(dry: bool, rich: bool):
console.success(f"App compiled successfully in {elapsed_time:.3f} seconds.")
+@cli.command(name="run-rust")
+@loglevel_option
+@click.option(
+ "--env",
+ type=click.Choice([e.value for e in constants.Env], case_sensitive=False),
+ default=constants.Env.DEV.value,
+ help="The environment to run the app in.",
+)
+@click.option(
+ "--frontend-only",
+ is_flag=True,
+ show_default=False,
+ help="Execute only frontend.",
+ envvar=environment.REFLEX_FRONTEND_ONLY.name,
+)
+@click.option(
+ "--backend-only",
+ is_flag=True,
+ show_default=False,
+ help="Execute only backend.",
+ envvar=environment.REFLEX_BACKEND_ONLY.name,
+)
+@click.option(
+ "--frontend-port",
+ type=int,
+ help="Specify a different frontend port.",
+ envvar=environment.REFLEX_FRONTEND_PORT.name,
+)
+@click.option(
+ "--backend-port",
+ type=int,
+ help="Specify a different backend port.",
+ envvar=environment.REFLEX_BACKEND_PORT.name,
+)
+@click.option(
+ "--backend-host",
+ help="Specify the backend host.",
+)
+@click.option(
+ "--routes",
+ multiple=True,
+ help="Restrict compilation to these routes (repeatable; default: all).",
+)
+def run_rust(
+ env: LITERAL_ENV,
+ frontend_only: bool,
+ backend_only: bool,
+ frontend_port: int | None,
+ backend_port: int | None,
+ backend_host: str | None,
+ routes: tuple[str, ...],
+):
+ """Run the app with the Rust compiler driving page JSX emission.
+
+ Requires:
+
+ * the ``reflex-compiler-rust`` wheel to be installed (see
+ ``packages/reflex-compiler-rust/``);
+ * ``.web/`` to already contain a Reflex scaffold (``package.json``,
+ ``vite.config.js``, ``utils/``). Run ``reflex init`` or ``reflex
+ run`` once to lay one down before invoking ``run-rust``.
+
+ Each registered page is evaluated in Python (the user's page callable
+ builds the Component tree) and then handed to Rust for IR conversion
+ and JSX emission. The legacy plugin chain, memoize plugin, and
+ custom-component compile do not run; for those, use ``reflex run``.
+ """
+ import time
+
+ from reflex.compiler import rust_pipeline
+ from reflex.compiler.session import CompilerSession
+ from reflex.utils import prerequisites
+
+ if frontend_only and backend_only:
+ console.error("Cannot use both --frontend-only and --backend-only options.")
+ raise SystemExit(1)
+
+ try:
+ sess = CompilerSession()
+ except RuntimeError as exc:
+ console.error(str(exc))
+ raise SystemExit(1) from exc
+
+ config = get_config()
+ frontend_port = frontend_port or config.frontend_port
+ backend_port = backend_port or config.backend_port
+ backend_host = backend_host or config.backend_host
+
+ environment.REFLEX_COMPILE_CONTEXT.set(constants.CompileContext.RUN)
+ environment.REFLEX_BACKEND_ONLY.set(backend_only)
+ environment.REFLEX_FRONTEND_ONLY.set(frontend_only)
+
+ running_mode = prerequisites.check_running_mode(frontend_only, backend_only)
+
+ if running_mode.has_frontend():
+ if prerequisites.needs_reinit():
+ _init(name=config.app_name)
+ get_config(reload=True)
+
+ if not rust_pipeline.scaffold_exists():
+ console.error(
+ ".web/ scaffold not found. Run `reflex init` or `reflex "
+ "run` once before invoking `reflex run-rust`."
+ )
+ raise SystemExit(1)
+
+ # Static artifacts the legacy compile produces — `app/root.jsx`
+ # (React Router root) and `utils/components.jsx` (memo index +
+ # toast/admin provider re-exports). When `_init` wiped `.web/`
+ # or on a fresh project they're missing, so we run the legacy
+ # compile *once* to lay them down. Subsequent runs skip this
+ # branch entirely and only the Rust pipeline executes. Pages
+ # the legacy compile emits get overwritten by the Rust pipeline
+ # below.
+ web_dir = prerequisites.get_web_dir()
+ # ``REFLEX_RUST_NO_LEGACY_REBUILD`` is set by
+ # ``scripts/diff_legacy_vs_rust.py`` so the rust snapshot reflects
+ # exactly what the Rust pipeline produces, without the static-
+ # artifact fallback masking the gaps.
+ needs_static_artifacts = (
+ not os.environ.get("REFLEX_RUST_NO_LEGACY_REBUILD")
+ and (
+ not (web_dir / "app" / "root.jsx").exists()
+ or not (web_dir / "utils" / "components.jsx").exists()
+ )
+ )
+ if needs_static_artifacts:
+ console.rule("[bold]Rebuilding static artifacts (one-shot legacy compile)")
+ legacy_start = time.monotonic()
+ # Clear the ``.nocompile`` marker a previous ``reflex run``
+ # may have left behind — otherwise ``App._compile`` short-
+ # circuits and we'd write neither ``root.jsx`` nor the memo
+ # index this branch is supposed to produce.
+ (web_dir / constants.NOCOMPILE_FILE).unlink(missing_ok=True)
+ prerequisites.get_compiled_app(trigger="cli_run_rust")
+ console.info(
+ f" artifacts rebuilt in {time.monotonic() - legacy_start:.3f}s"
+ )
+
+ console.rule("[bold]Rust pipeline")
+ py_start = time.monotonic()
+ app_info = prerequisites.get_and_validate_app()
+ console.info(
+ f" app import finished in {(time.monotonic() - py_start) * 1000:.1f}ms"
+ )
+
+ console.rule("[bold]Emitting pages with reflex-compiler-rust")
+ rust_start = time.monotonic()
+ written, all_imports = rust_pipeline.compile_pages(
+ app_info.app,
+ session=sess,
+ routes=list(routes) if routes else None,
+ )
+ elapsed = time.monotonic() - rust_start
+ for route, path in sorted(written.items()):
+ console.info(f" {route:<24} → {markup.escape(str(path))}")
+ console.info(
+ f" rust-compiled {len(written)} page(s) in {elapsed * 1000:.1f}ms"
+ )
+
+ # Install frontend dependencies (bun install of package.json +
+ # any custom packages the pages pulled in). The legacy compile
+ # would do this inside ``App._compile``; we run it ourselves
+ # here so ``react-router dev`` finds its binary in node_modules.
+ # If the one-shot legacy compile above already ran, it handled
+ # this — skip the redundant pass.
+ if not needs_static_artifacts:
+ console.rule("[bold]Installing frontend packages")
+ install_start = time.monotonic()
+ app_info.app._get_frontend_packages(all_imports)
+ console.info(
+ f" install finished in {(time.monotonic() - install_start) * 1000:.1f}ms"
+ )
+
+ # The diff script (``scripts/diff_legacy_vs_rust.py``) sets this env var
+ # so it can capture the compile output without starting a dev server.
+ if os.environ.get("REFLEX_RUN_RUST_COMPILE_ONLY"):
+ return
+
+ _skip_compile()
+ _run(
+ env=constants.Env.DEV if env == constants.Env.DEV else constants.Env.PROD,
+ running_mode=running_mode,
+ frontend_port=frontend_port,
+ backend_port=backend_port,
+ backend_host=backend_host,
+ )
+
+
@cli.command()
@loglevel_option
@click.option(
diff --git a/reflex/utils/telemetry_context.py b/reflex/utils/telemetry_context.py
index e16231957bf..0bc48255fad 100644
--- a/reflex/utils/telemetry_context.py
+++ b/reflex/utils/telemetry_context.py
@@ -10,7 +10,12 @@
from reflex_base.context.base import BaseContext
CompileTrigger = Literal[
- "initial", "cli_compile", "backend_startup", "hot_reload", "export"
+ "initial",
+ "cli_compile",
+ "cli_run_rust",
+ "backend_startup",
+ "hot_reload",
+ "export",
]
diff --git a/scripts/benchmark_compile.py b/scripts/benchmark_compile.py
new file mode 100644
index 00000000000..b1b78372fcb
--- /dev/null
+++ b/scripts/benchmark_compile.py
@@ -0,0 +1,199 @@
+"""Benchmark driver for the Rust compiler pipeline. See plan §6a.
+
+Reads the corpus under ``tests/codegen_corpus/``, drives each fixture
+through the Component → IR → Rust → JS pipeline, and reports cold + warm
+wall-clock plus per-fixture peak RSS. Used both by humans (run it locally
+to see the numbers) and by CI (``--check`` reads the baseline and exits
+non-zero if any fixture regresses by >5%).
+
+Examples::
+
+ uv run python scripts/benchmark_compile.py # all fixtures
+ uv run python scripts/benchmark_compile.py 06_cond # one fixture
+ uv run python scripts/benchmark_compile.py --runs 10
+ uv run python scripts/benchmark_compile.py --check # CI mode
+ uv run python scripts/benchmark_compile.py --update-baseline
+
+The script does NOT invoke the legacy Python compiler — those numbers come
+from the existing ``scripts/profile_compilation_hotspots.py``. This script
+exclusively measures the Rust path, which is what §13 cares about.
+"""
+
+from __future__ import annotations
+
+import argparse
+import gc
+import json
+import os
+import resource
+import statistics
+import sys
+import time
+from dataclasses import dataclass, asdict
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+CORPUS_DIR = REPO_ROOT / "tests" / "codegen_corpus"
+BASELINE_PATH = CORPUS_DIR / "baseline.json"
+REGRESSION_THRESHOLD = 0.05 # 5% per plan §6
+NOISE_FLOOR_US = 5.0 # below this, percentage regressions are noise
+
+
+# Ensure the repo is on sys.path so we can import `reflex.compiler.ir.*`.
+sys.path.insert(0, str(REPO_ROOT))
+
+
+@dataclass
+class FixtureResult:
+ name: str
+ cold_us: float
+ warm_us: float
+ peak_rss_kb: int
+ output_bytes: int
+
+
+def _peak_rss_kb() -> int:
+ """Linux returns RSS in kB from getrusage; macOS returns bytes. Best-effort."""
+ raw = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
+ if sys.platform == "darwin":
+ return int(raw / 1024)
+ return int(raw)
+
+
+def bench_one(fixture, runs: int) -> FixtureResult:
+ from reflex.compiler.session import CompilerSession
+
+ try:
+ sess = CompilerSession()
+ except RuntimeError as exc:
+ raise SystemExit(str(exc)) from exc
+
+ component = fixture.build()
+
+ # Cold: clear the cache, measure one run.
+ sess.clear_cache()
+ gc.collect()
+ t0 = time.perf_counter_ns()
+ js = sess.compile_page_from_component(fixture.ident, component, fixture.route)
+ cold_ns = time.perf_counter_ns() - t0
+
+ # Warm: median of N subsequent runs, all hitting the cache.
+ samples = []
+ for _ in range(runs):
+ t0 = time.perf_counter_ns()
+ sess.compile_page_from_component(fixture.ident, component, fixture.route)
+ samples.append(time.perf_counter_ns() - t0)
+ samples.sort()
+ warm_ns = samples[len(samples) // 2]
+
+ return FixtureResult(
+ name=fixture.name,
+ cold_us=cold_ns / 1000.0,
+ warm_us=warm_ns / 1000.0,
+ peak_rss_kb=_peak_rss_kb(),
+ output_bytes=len(js.encode("utf-8")),
+ )
+
+
+def load_baseline() -> dict[str, dict]:
+ if not BASELINE_PATH.is_file():
+ return {}
+ return json.loads(BASELINE_PATH.read_text())
+
+
+def write_baseline(results: list[FixtureResult]) -> None:
+ payload = {r.name: asdict(r) for r in results}
+ BASELINE_PATH.write_text(json.dumps(payload, indent=2, sort_keys=True) + "\n")
+
+
+def check_regressions(results: list[FixtureResult]) -> int:
+ baseline = load_baseline()
+ if not baseline:
+ print("no baseline.json — run with --update-baseline first", file=sys.stderr)
+ return 1
+ failures = 0
+ for r in results:
+ prior = baseline.get(r.name)
+ if not prior:
+ print(f" [warn] {r.name}: no baseline entry, skipping")
+ continue
+ # warm_us is the regression-gating metric per plan §6a.
+ prior_warm = prior["warm_us"]
+ ratio = (r.warm_us - prior_warm) / max(prior_warm, 1.0)
+ # Below the noise floor, sub-microsecond variance is not a real
+ # signal — pytest-style flakes would dominate. We still print the
+ # numbers so humans can see drift, but the test doesn't fail.
+ below_floor = max(r.warm_us, prior_warm) < NOISE_FLOOR_US
+ status = "ok"
+ if ratio > REGRESSION_THRESHOLD and not below_floor:
+ failures += 1
+ status = f"FAIL (+{ratio*100:.1f}%)"
+ elif ratio > REGRESSION_THRESHOLD:
+ status = f"ok (below {NOISE_FLOOR_US:.0f}µs noise floor, +{ratio*100:.1f}%)"
+ print(
+ f" {r.name:<24} cold {r.cold_us:>8.1f}µs warm {r.warm_us:>8.1f}µs "
+ f"baseline {prior_warm:>8.1f}µs {status}"
+ )
+ return failures
+
+
+def main() -> int:
+ parser = argparse.ArgumentParser(description=__doc__)
+ parser.add_argument(
+ "fixture",
+ nargs="?",
+ help="run a single fixture by directory name (e.g. 06_cond). default: all",
+ )
+ parser.add_argument("--runs", type=int, default=5, help="warm-run sample size (median)")
+ parser.add_argument("--check", action="store_true", help="exit 1 on >5%% warm regression")
+ parser.add_argument("--update-baseline", action="store_true", help="overwrite baseline.json")
+ args = parser.parse_args()
+
+ # Lazy import to keep --help fast and free of project-dep noise.
+ from tests.codegen_corpus._runner import discover
+
+ fixtures = discover()
+ if args.fixture:
+ fixtures = [f for f in fixtures if f.name == args.fixture]
+ if not fixtures:
+ print(f"no fixture named {args.fixture!r}", file=sys.stderr)
+ return 1
+
+ print(f"running {len(fixtures)} fixture(s), {args.runs} warm samples each\n")
+ results: list[FixtureResult] = []
+ for f in fixtures:
+ r = bench_one(f, args.runs)
+ results.append(r)
+ print(
+ f" {r.name:<24} cold {r.cold_us:>8.1f}µs warm {r.warm_us:>8.1f}µs "
+ f"out {r.output_bytes:>5}B rss {r.peak_rss_kb:>6}kB"
+ )
+
+ if args.update_baseline:
+ write_baseline(results)
+ print(f"\nwrote baseline: {BASELINE_PATH}")
+ return 0
+
+ if args.check:
+ print()
+ failures = check_regressions(results)
+ if failures:
+ print(f"\nFAILED: {failures} fixture(s) regressed by >5%", file=sys.stderr)
+ return 1
+ print("\nall fixtures within 5% of baseline.")
+ return 0
+
+ if len(results) > 1:
+ cold = [r.cold_us for r in results]
+ warm = [r.warm_us for r in results]
+ print(
+ f"\nsummary: cold median {statistics.median(cold):>6.1f}µs "
+ f"warm median {statistics.median(warm):>6.1f}µs "
+ f"warm geomean {statistics.geometric_mean(warm):>6.1f}µs"
+ )
+ return 0
+
+
+if __name__ == "__main__":
+ sys.exit(main())
diff --git a/scripts/benchmark_memoize.py b/scripts/benchmark_memoize.py
new file mode 100644
index 00000000000..1cab4f4a6d9
--- /dev/null
+++ b/scripts/benchmark_memoize.py
@@ -0,0 +1,193 @@
+"""Benchmark the memoize-plugin cost for a Reflex app.
+
+Pins the timings against a baseline so each iteration's port work is
+measurable. Memoization is documented in plan §0 as the dominant bucket
+on large apps (~47% on the docs app), so every speedup needs to be
+compared against this baseline.
+
+Usage::
+
+ cd <app-dir> # e.g. docs/app
+ CI=1 uv run python <repo>/scripts/benchmark_memoize.py
+ CI=1 uv run python <repo>/scripts/benchmark_memoize.py --runs 3
+ CI=1 uv run python <repo>/scripts/benchmark_memoize.py --check # CI mode
+ CI=1 uv run python <repo>/scripts/benchmark_memoize.py --update-baseline
+
+Output (per run, then median):
+ wall total compile wall-clock
+ decide _should_memoize cumtime
+ build_wrapper _build_wrapper cumtime
+ passthrough_memo create_passthrough_component_memo cumtime
+ compile_memo_files _compile_memo_components cumtime
+ leave_component memoize.leave_component cumtime
+
+The baseline is per-app, keyed by the rxconfig's ``app_name``. Stored at
+``<app-dir>/.memoize_baseline.json``.
+
+Exit codes:
+ 0 — all buckets within ``--threshold`` (default 5%) of baseline.
+ 1 — at least one bucket regressed beyond the threshold.
+ 2 — invocation error (no app, no baseline, etc.).
+"""
+
+from __future__ import annotations
+
+import argparse
+import cProfile
+import json
+import pstats
+import statistics
+import sys
+import time
+from dataclasses import asdict, dataclass
+from pathlib import Path
+
+
+_TRACKED_FUNCTIONS = {
+ # bucket name → substring matched against pstats keys (`file:line(name)`).
+ "decide": "memoize.py:120(_should_memoize)",
+ "build_wrapper": "memoize.py:329(_build_wrapper)",
+ "passthrough_memo": "memo.py:1017(create_passthrough_component_memo)",
+ "compile_memo_files": "compiler.py:396(_compile_memo_components)",
+ "leave_component": "memoize.py:276(leave_component)",
+}
+
+
+@dataclass
+class Sample:
+ wall_ms: float
+ decide_ms: float
+ build_wrapper_ms: float
+ passthrough_memo_ms: float
+ compile_memo_files_ms: float
+ leave_component_ms: float
+
+
+def _cum_ms(stats: pstats.Stats, needle: str) -> float:
+ """Sum cumtime (in ms) across pstats keys whose label contains ``needle``."""
+ total = 0.0
+ for key, (_cc, _nc, _tt, ct, _cs) in stats.stats.items(): # type: ignore[attr-defined]
+ label = f"{key[0]}:{key[1]}({key[2]})"
+ if needle in label:
+ total += ct
+ return total * 1000.0
+
+
+def measure_once() -> Sample:
+ from reflex.utils import prerequisites
+
+ prof = cProfile.Profile()
+ t = time.perf_counter()
+ prof.enable()
+ prerequisites.get_compiled_app(trigger="bench_memoize", reload=True)
+ prof.disable()
+ wall = (time.perf_counter() - t) * 1000.0
+ stats = pstats.Stats(prof)
+ return Sample(
+ wall_ms=wall,
+ decide_ms=_cum_ms(stats, _TRACKED_FUNCTIONS["decide"]),
+ build_wrapper_ms=_cum_ms(stats, _TRACKED_FUNCTIONS["build_wrapper"]),
+ passthrough_memo_ms=_cum_ms(stats, _TRACKED_FUNCTIONS["passthrough_memo"]),
+ compile_memo_files_ms=_cum_ms(stats, _TRACKED_FUNCTIONS["compile_memo_files"]),
+ leave_component_ms=_cum_ms(stats, _TRACKED_FUNCTIONS["leave_component"]),
+ )
+
+
+def aggregate(samples: list[Sample]) -> Sample:
+ fields = ("wall_ms", "decide_ms", "build_wrapper_ms", "passthrough_memo_ms", "compile_memo_files_ms", "leave_component_ms")
+ return Sample(**{
+ f: statistics.median([getattr(s, f) for s in samples]) for f in fields
+ })
+
+
+def baseline_path(app_dir: Path) -> Path:
+ return app_dir / ".memoize_baseline.json"
+
+
+def load_baseline(app_dir: Path) -> Sample | None:
+ p = baseline_path(app_dir)
+ if not p.is_file():
+ return None
+ return Sample(**json.loads(p.read_text()))
+
+
+def save_baseline(app_dir: Path, s: Sample) -> None:
+ baseline_path(app_dir).write_text(json.dumps(asdict(s), indent=2) + "\n")
+
+
+def _fmt(name: str, current: float, baseline: float | None, threshold: float) -> str:
+ if baseline is None:
+ return f" {name:<22} {current:>8.1f} ms"
+ delta = (current - baseline) / max(baseline, 1.0)
+ flag = " "
+ if abs(delta) > threshold:
+ flag = "✗" if delta > 0 else "✓"
+ pct = f"{delta * 100:+.1f}%"
+ return f" {name:<22} {current:>8.1f} ms (baseline {baseline:>7.1f} ms, {pct:>7}) {flag}"
+
+
+def main() -> int:
+ parser = argparse.ArgumentParser(description=__doc__)
+ parser.add_argument("--runs", type=int, default=3)
+ parser.add_argument("--threshold", type=float, default=0.05, help="regression threshold (5%% default)")
+ parser.add_argument("--check", action="store_true", help="CI mode: exit 1 on regression")
+ parser.add_argument("--update-baseline", action="store_true")
+ args = parser.parse_args()
+
+ app_dir = Path.cwd().resolve()
+ if not (app_dir / "rxconfig.py").is_file():
+ print("must run from a Reflex app directory (rxconfig.py missing)", file=sys.stderr)
+ return 2
+
+ # Warm the import cache so the first sample isn't an outlier.
+ from reflex.utils import prerequisites
+
+ prerequisites.get_compiled_app(trigger="bench_warm")
+
+ samples: list[Sample] = []
+ for i in range(args.runs):
+ s = measure_once()
+ samples.append(s)
+ print(f" run {i+1}: wall={s.wall_ms:.0f} ms decide={s.decide_ms:.0f} "
+ f"build={s.build_wrapper_ms:.0f} passthrough={s.passthrough_memo_ms:.0f} "
+ f"compile_files={s.compile_memo_files_ms:.0f} leave={s.leave_component_ms:.0f}")
+
+ median = aggregate(samples)
+
+ print(f"\n=== median over {args.runs} run(s) ({app_dir.name}) ===")
+ baseline = None if args.update_baseline else load_baseline(app_dir)
+ rows = [
+ ("wall", median.wall_ms),
+ ("decide", median.decide_ms),
+ ("leave_component", median.leave_component_ms),
+ ("build_wrapper", median.build_wrapper_ms),
+ ("passthrough_memo", median.passthrough_memo_ms),
+ ("compile_memo_files", median.compile_memo_files_ms),
+ ]
+ for name, current in rows:
+ b = getattr(baseline, f"{name if name == 'wall' else name}_ms", None) if baseline else None
+ print(_fmt(name, current, b, args.threshold))
+
+ if args.update_baseline:
+ save_baseline(app_dir, median)
+ print(f"\nwrote baseline → {baseline_path(app_dir)}")
+ return 0
+
+ if args.check:
+ if baseline is None:
+ print("no baseline; run --update-baseline first", file=sys.stderr)
+ return 2
+ failed = False
+ for name, current in rows:
+ b = getattr(baseline, f"{name}_ms", None)
+ if b is None:
+ continue
+ if (current - b) / max(b, 1.0) > args.threshold:
+ failed = True
+ if failed:
+ return 1
+ return 0
+
+
+if __name__ == "__main__":
+ raise SystemExit(main())
diff --git a/scripts/benchmark_single_page.py b/scripts/benchmark_single_page.py
new file mode 100644
index 00000000000..93ff5f1b58f
--- /dev/null
+++ b/scripts/benchmark_single_page.py
@@ -0,0 +1,635 @@
+"""Single-page microbenchmark for the run-rust pipeline.
+
+Builds **one** feature-rich page (state, vars, foreach, cond, match,
+event handlers, markdown — all the stuff that creates memo candidates +
+add_imports overrides), then runs the actual compile_pages flow with
+per-phase timers labeled Python / Rust / Hybrid so we know exactly
+which work is Python-bound and which is in the Rust extension.
+
+Each phase is timed inside an instrumented copy of
+``reflex.compiler.rust_pipeline.compile_pages``'s page loop — same code
+path the CLI runs, just with ``perf_counter_ns`` around each step.
+
+Usage:
+ uv run python scripts/benchmark_single_page.py [runs]
+
+Default: 10 runs. First run is treated as a warmup and excluded from
+the aggregate so the per-component ``_imports_cache`` doesn't make
+subsequent runs look artificially cheap.
+"""
+
+from __future__ import annotations
+
+import os
+import statistics
+import sys
+import tempfile
+import time
+from contextlib import contextmanager
+from pathlib import Path
+
+
+def _ns() -> int:
+ return time.perf_counter_ns()
+
+
+def _ms(ns: int | float) -> float:
+ return ns / 1_000_000
+
+
+# ---------------------------------------------------------------------------
+# Synthetic page
+# ---------------------------------------------------------------------------
+
+
+def _build_app(scale: int = 1):
+ """One page exercising the surfaces compile_pages touches.
+
+ Args:
+ scale: how many "section" blocks to repeat. ``scale=1`` is the
+ ~47-node baseline; each extra unit adds ~80 nodes.
+
+ Returns:
+ A loaded ``rx.App`` with a single ``/bench`` route registered.
+ """
+ import reflex as rx
+
+ class BenchState(rx.State):
+ items: list[str] = [f"item-{i}" for i in range(20)]
+ counter: int = 0
+ current_key: str = "k1"
+
+ @rx.event
+ def increment(self) -> None:
+ self.counter += 1
+
+ @rx.event
+ def zero_counter(self) -> None:
+ self.counter = 0
+
+ def row(item: rx.Var) -> rx.Component:
+ return rx.hstack(
+ rx.text(item),
+ rx.button("inc", on_click=BenchState.increment),
+ rx.button("reset", on_click=BenchState.zero_counter),
+ )
+
+ def section() -> rx.Component:
+ return rx.vstack(
+ rx.heading("Microbench page", size="3"),
+ rx.text(f"counter: {BenchState.counter}"),
+ rx.markdown(
+ "# header\n\nSome **markdown** with `code` and a [link](https://x)."
+ ),
+ rx.cond(
+ BenchState.counter > 0,
+ rx.box(rx.text("positive"), rx.button("more")),
+ rx.box(rx.text("non-positive"), rx.button("kick")),
+ ),
+ rx.match(
+ BenchState.current_key,
+ ("k1", rx.text("key 1 active")),
+ ("k2", rx.text("key 2 active")),
+ rx.text("default"),
+ ),
+ rx.foreach(BenchState.items, row),
+ rx.hstack(
+ rx.button("global inc", on_click=BenchState.increment),
+ rx.button("global reset", on_click=BenchState.zero_counter),
+ ),
+ )
+
+ def page() -> rx.Component:
+ return rx.vstack(*[section() for _ in range(scale)])
+
+ app = rx.App()
+ app.add_page(page, route="/bench")
+ return app
+
+
+# ---------------------------------------------------------------------------
+# Phase timer
+# ---------------------------------------------------------------------------
+
+
+class PhaseTimer:
+ """Accumulates per-phase nanosecond durations across runs.
+
+ Phases are tagged ``python``, ``rust``, or ``hybrid`` (Rust walk
+ that calls back into Python). The summary makes the runtime split
+ explicit.
+ """
+
+ KIND_ORDER = {"python": 0, "hybrid": 1, "rust": 2}
+
+ def __init__(self) -> None:
+ self.samples: dict[str, list[int]] = {}
+ self.kinds: dict[str, str] = {}
+ self.order: list[str] = []
+
+ @contextmanager
+ def measure(self, name: str, kind: str = "python"):
+ if name not in self.kinds:
+ self.kinds[name] = kind
+ self.order.append(name)
+ t0 = _ns()
+ try:
+ yield
+ finally:
+ self.samples.setdefault(name, []).append(_ns() - t0)
+
+ def trim_warmup(self) -> None:
+ """Discard the first sample of every phase (the cold-cache run)."""
+ for name in self.samples:
+ if len(self.samples[name]) > 1:
+ self.samples[name] = self.samples[name][1:]
+
+ def report(self, runs: int) -> None:
+ per_run_medians: list[tuple[str, float, str]] = []
+ kind_run_totals = {"python": 0.0, "hybrid": 0.0, "rust": 0.0}
+
+ header = (
+ f"{'phase':<46}{'kind':<8}"
+ f"{'median':>9}{'mean':>9}{'p95':>9}{'min':>9}{'max':>9}"
+ )
+ print(header)
+ print(f"{'':<46}{'':<8}{'(ms)':>9}{'(ms)':>9}{'(ms)':>9}{'(ms)':>9}{'(ms)':>9}")
+ print("-" * len(header))
+
+ for name in self.order:
+ samples = [s / 1_000_000 for s in self.samples[name]]
+ median = statistics.median(samples)
+ mean = statistics.mean(samples)
+ p95 = _p95(samples)
+ mn = min(samples)
+ mx = max(samples)
+ kind = self.kinds[name]
+ per_run_medians.append((name, median, kind))
+ kind_run_totals[kind] += median
+ print(
+ f"{name:<46}{kind:<8}"
+ f"{median:>9.3f}{mean:>9.3f}{p95:>9.3f}{mn:>9.3f}{mx:>9.3f}"
+ )
+
+ per_run_median_total = sum(m for _, m, _ in per_run_medians)
+ print("-" * len(header))
+ print(f"{'Per-run median total:':<54}{per_run_median_total:>9.3f} ms")
+ print()
+ print("Breakdown by where the work actually runs (median per run):")
+ for kind in ("python", "hybrid", "rust"):
+ t = kind_run_totals[kind]
+ pct = (t / per_run_median_total * 100) if per_run_median_total else 0
+ label = {
+ "python": "Python only",
+ "hybrid": "Rust + PyO3 callbacks",
+ "rust": "pure Rust (no callbacks)",
+ }[kind]
+ print(f" {label:<28}{t:>8.2f} ms ({pct:5.1f}%)")
+ print()
+ print(f"Runs aggregated: {runs} (1 warmup discarded)")
+
+
+def _p95(samples: list[float]) -> float:
+ if not samples:
+ return 0.0
+ s = sorted(samples)
+ return s[int(0.95 * (len(s) - 1))]
+
+
+# ---------------------------------------------------------------------------
+# Instrumented compile loop
+# ---------------------------------------------------------------------------
+
+
+def _instrumented_compile_pages(app, sess, timer: PhaseTimer, web_dir: Path) -> None:
+ """Mirror of ``rust_pipeline.compile_pages`` with per-phase timers.
+
+ Skips the post-loop static-artifact emission (``_emit_static_artifacts``,
+ plugin pre-compile, custom-component re-emit) — those run once per
+ compile regardless of page count, so the single-page benchmark
+ focuses on the per-page path.
+
+ Args:
+ app: a loaded ``rx.App`` with at least one route.
+ sess: the live ``CompilerSession`` shared across runs.
+ timer: the accumulator for phase samples.
+ web_dir: writable directory the rust emitters target.
+ """
+ from reflex_base.compiler.templates import _render_hooks
+
+ from reflex.compiler import compiler as legacy_compiler
+ from reflex.compiler import utils as compiler_utils
+ from reflex.compiler.compiler import compile_unevaluated_page
+ from reflex.compiler.rust_memo import walk_and_memoize
+
+ app._apply_decorated_pages()
+
+ all_imports: dict[str, list] = {}
+ memo_bodies: dict[str, object] = {}
+ collected_app_wraps: dict[tuple[int, str], object] = {}
+
+ for route, unev in app._unevaluated_pages.items():
+ with timer.measure("compile_unevaluated_page", "python"):
+ component = compile_unevaluated_page(route, unev, app.style, app.theme)
+
+ with timer.measure("collect_all_imports_into", "hybrid"):
+ sess.collect_all_imports_into(all_imports, component)
+
+ with timer.measure("_get_all_app_wrap_components", "python"):
+ collected_app_wraps.update(component._get_all_app_wrap_components())
+
+ with timer.measure("walk_and_memoize", "python"):
+ component = walk_and_memoize(component, sess, memo_bodies)
+
+ with timer.measure("_get_all_custom_code", "python"):
+ page_custom_code = list(component._get_all_custom_code())
+
+ with timer.measure("_get_all_hooks + _render_hooks", "python"):
+ page_hooks_body = _render_hooks(component._get_all_hooks())
+
+ with timer.measure("compile_page_from_component (Rust JSX emit)", "hybrid"):
+ rust_js = sess.compile_page_from_component(
+ "Bench",
+ component,
+ route,
+ custom_code=page_custom_code,
+ hooks_body=page_hooks_body,
+ )
+
+ with timer.measure("page write_text", "python"):
+ out_path = Path(compiler_utils.get_page_path(route))
+ out_path.parent.mkdir(parents=True, exist_ok=True)
+ out_path.write_text(rust_js)
+
+ # Memo body emission — split into sub-phases so the Python vs Rust
+ # split is legible.
+ from reflex.compiler.rust_memo import _harvest_pre_hooks, _signature_for
+
+ components_dir = Path(compiler_utils.get_memo_components_dir())
+ components_dir.mkdir(parents=True, exist_ok=True)
+
+ with timer.measure("memo body: collect_all_imports_into", "hybrid"):
+ for body, _definition in memo_bodies.values():
+ sess.collect_all_imports_into(all_imports, body)
+
+ with timer.measure("memo body: _harvest_pre_hooks (Python walk)", "python"):
+ prepared: list[tuple[str, str, object, str]] = []
+ for name, (body, definition) in memo_bodies.items():
+ prepared.append((
+ name,
+ _signature_for(definition),
+ body,
+ _harvest_pre_hooks(body),
+ ))
+
+ with timer.measure("memo body: compile_memo_from_component (Rust)", "hybrid"):
+ emitted_js: list[tuple[str, str]] = []
+ for name, signature, body, pre_hooks in prepared:
+ js = sess.compile_memo_from_component(
+ name, signature, body, pre_hooks=pre_hooks
+ )
+ emitted_js.append((name, js))
+
+ with timer.measure("memo body: write_text", "python"):
+ for name, js in emitted_js:
+ (components_dir / f"{name}.jsx").write_text(js)
+
+ # Keep the legacy `_get_all_imports` for app_root → ordered template
+ # rendering. Time it so we have visibility, but don't refactor.
+ with timer.measure("app_root composition + render", "python"):
+ from reflex_base.compiler.templates import _RenderUtils
+ from reflex_base.config import get_config
+
+ from reflex.compiler.compiler import (
+ _apply_common_imports,
+ _resolve_app_wrap_components,
+ _resolve_radix_themes_plugin,
+ )
+
+ _, radix_themes_plugin = _resolve_radix_themes_plugin(app, get_config().plugins)
+ if radix_themes_plugin.enabled and radix_themes_plugin.theme is not None:
+ collected_app_wraps[20, "Theme"] = radix_themes_plugin.theme
+ app_wrappers = _resolve_app_wrap_components(app, collected_app_wraps)
+ app_root = app._app_root(app_wrappers)
+ sess.collect_all_imports_into(all_imports, app_root)
+ app_root_imports = app_root._get_all_imports()
+ _apply_common_imports(app_root_imports)
+ _ = "\n".join(
+ _RenderUtils.get_import(m)
+ for m in compiler_utils.compile_imports(app_root_imports)
+ )
+ _ = "\n".join(app_root._get_all_custom_code())
+ _ = _render_hooks(app_root._get_all_hooks())
+ _ = _RenderUtils.render(app_root.render())
+ _ = legacy_compiler # silence unused
+
+
+# ---------------------------------------------------------------------------
+# Driver
+# ---------------------------------------------------------------------------
+
+
+def _setup_web_dir(tmp: Path) -> None:
+ """Point Reflex at a writable tmp .web/ for this benchmark.
+
+ Args:
+ tmp: directory to use as ``REFLEX_ROOT``.
+ """
+ from reflex.utils import prerequisites
+
+ web = tmp / ".web"
+ web.mkdir(parents=True, exist_ok=True)
+ # Monkey-patch get_web_dir so all compiler_utils paths land in tmp.
+ prerequisites.get_web_dir = lambda: web # type: ignore[assignment]
+
+
+def _compare_python_vs_rust(app, sess, runs: int) -> None:
+ """Head-to-head with **sub-step** timing on both paths.
+
+ Each path is broken down into the discrete things it does so the
+ exact source of the gap is visible — no assumptions.
+
+ Args:
+ app: a loaded ``rx.App`` with at least one route.
+ sess: the live Rust ``CompilerSession``.
+ runs: number of timed iterations (one warmup discarded).
+ """
+ from reflex.compiler import utils as compiler_utils
+ from reflex.compiler.compiler import (
+ _apply_common_imports,
+ compile_unevaluated_page,
+ )
+ from reflex_base.compiler import templates as base_templates
+ from reflex_base.compiler.templates import _render_hooks
+
+ route, unev = next(iter(app._unevaluated_pages.items()))
+
+ # Per-sub-step accumulators.
+ py_steps: dict[str, list[int]] = {
+ "_get_all_imports": [],
+ "compile_imports (apply+sort)": [],
+ "_get_all_dynamic_imports + sort": [],
+ "_get_all_custom_code": [],
+ "_get_all_hooks": [],
+ "component.render() (recursive)": [],
+ "page_template(...)": [],
+ }
+ rust_steps: dict[str, list[int]] = {
+ "collect_all_imports_into (Rust+PyO3)": [],
+ "_get_all_custom_code": [],
+ "_get_all_hooks + _render_hooks": [],
+ "compile_page_from_component (Rust+PyO3)": [],
+ }
+
+ for run_idx in range(runs + 1):
+ # --- PYTHON PATH ---
+ component_py = compile_unevaluated_page(route, unev, app.style, app.theme)
+
+ t0 = _ns()
+ imports = component_py._get_all_imports()
+ t1 = _ns()
+ _apply_common_imports(imports)
+ compiled_imports = compiler_utils.compile_imports(imports)
+ t2 = _ns()
+ dynamic = sorted(component_py._get_all_dynamic_imports())
+ t3 = _ns()
+ custom = component_py._get_all_custom_code()
+ t4 = _ns()
+ hooks = component_py._get_all_hooks()
+ t5 = _ns()
+ rendered = component_py.render()
+ t6 = _ns()
+ _ = base_templates.page_template(
+ imports=compiled_imports,
+ dynamic_imports=dynamic,
+ custom_codes=custom,
+ hooks=hooks,
+ render=rendered,
+ )
+ t7 = _ns()
+
+ py_steps["_get_all_imports"].append(t1 - t0)
+ py_steps["compile_imports (apply+sort)"].append(t2 - t1)
+ py_steps["_get_all_dynamic_imports + sort"].append(t3 - t2)
+ py_steps["_get_all_custom_code"].append(t4 - t3)
+ py_steps["_get_all_hooks"].append(t5 - t4)
+ py_steps["component.render() (recursive)"].append(t6 - t5)
+ py_steps["page_template(...)"].append(t7 - t6)
+
+ # --- RUST PATH ---
+ component_rust = compile_unevaluated_page(route, unev, app.style, app.theme)
+
+ t0 = _ns()
+ page_imports: dict[str, list] = {}
+ sess.collect_all_imports_into(page_imports, component_rust)
+ t1 = _ns()
+ page_custom_code = list(component_rust._get_all_custom_code())
+ t2 = _ns()
+ page_hooks_body = _render_hooks(component_rust._get_all_hooks())
+ t3 = _ns()
+ _ = sess.compile_page_from_component(
+ "Bench",
+ component_rust,
+ route,
+ custom_code=page_custom_code,
+ hooks_body=page_hooks_body,
+ )
+ t4 = _ns()
+
+ rust_steps["collect_all_imports_into (Rust+PyO3)"].append(t1 - t0)
+ rust_steps["_get_all_custom_code"].append(t2 - t1)
+ rust_steps["_get_all_hooks + _render_hooks"].append(t3 - t2)
+ rust_steps["compile_page_from_component (Rust+PyO3)"].append(t4 - t3)
+
+ if run_idx == 0:
+ # Warmup samples tossed.
+ for v in py_steps.values():
+ v.pop()
+ for v in rust_steps.values():
+ v.pop()
+
+ def _summary(steps: dict[str, list[int]], label: str) -> None:
+ print()
+ print(f"=== {label} ===")
+ header = (
+ f"{'step':<44}"
+ f"{'median':>10}{'mean':>10}{'p95':>10}{'min':>10}{'max':>10}"
+ )
+ print(header)
+ print(
+ f"{'':<44}"
+ f"{'(ms)':>10}{'(ms)':>10}{'(ms)':>10}{'(ms)':>10}{'(ms)':>10}"
+ )
+ print("-" * len(header))
+ total = 0.0
+ for name, ns_samples in steps.items():
+ ms = [n / 1_000_000 for n in ns_samples]
+ med = statistics.median(ms)
+ total += med
+ print(
+ f"{name:<44}"
+ f"{med:>10.3f}{statistics.mean(ms):>10.3f}"
+ f"{_p95(ms):>10.3f}{min(ms):>10.3f}{max(ms):>10.3f}"
+ )
+ print("-" * len(header))
+ print(f"{'Total (sum of medians):':<44}{total:>10.3f} ms")
+ return total
+
+ print()
+ print("=" * 90)
+ print("DETAILED PER-STEP COMPARISON")
+ print("=" * 90)
+ py_total = _summary(py_steps, "Python _compile_page — sub-steps")
+ rust_total = _summary(rust_steps, "Rust pipeline — sub-steps")
+ print()
+ gap = rust_total - py_total
+ pct = gap / py_total * 100 if py_total else 0
+ print(
+ f"Rust total {rust_total:.3f} ms | Python total {py_total:.3f} ms "
+ f"| Gap = {gap:+.3f} ms ({pct:+.1f}%)"
+ )
+
+ # Pull Rust-side phase timings from the most recent emit so we can
+ # see WHERE inside compile_page_from_component the time actually
+ # goes. Run one more compile to populate clean counters.
+ component_last = compile_unevaluated_page(route, unev, app.style, app.theme)
+ page_imports2: dict[str, list] = {}
+ sess.collect_all_imports_into(page_imports2, component_last)
+ page_custom_code2 = list(component_last._get_all_custom_code())
+ page_hooks_body2 = _render_hooks(component_last._get_all_hooks())
+ _ = sess.compile_page_from_component(
+ "Bench",
+ component_last,
+ route,
+ custom_code=page_custom_code2,
+ hooks_body=page_hooks_body2,
+ )
+ rust_phases = sess.last_phase_timings_ns()
+
+ print()
+ print("=" * 90)
+ print("RUST-SIDE PHASE BREAKDOWN (inside compile_page_from_component)")
+ print("=" * 90)
+ print("Last single compile, sampled from thread-local counters.")
+ print()
+ count_keys = {
+ "node_count",
+ "element_count",
+ "var_count",
+ "prop_count",
+ "event_handler_count",
+ }
+ counts = {k: v for k, v in rust_phases.items() if k in count_keys}
+ spans = {k: v for k, v in rust_phases.items() if k not in count_keys}
+
+ total_ns = spans.get("read_page_total_ns", 0)
+ emit_ns = spans.get("emit_ns", 0)
+ sub_phases = [
+ (k, v)
+ for k, v in spans.items()
+ if k not in ("read_page_total_ns", "emit_ns")
+ ]
+ sub_phases.sort(key=lambda kv: kv[1], reverse=True)
+
+ print(f"{'phase':<32}{'ns':>14}{'ms':>14}")
+ print("-" * 60)
+ print(f"{'read_page_total_ns':<32}{total_ns:>14}{total_ns / 1e6:>14.3f}")
+ print(f"{' emit_ns (pure Rust)':<32}{emit_ns:>14}{emit_ns / 1e6:>14.3f}")
+ for k, v in sub_phases:
+ print(f"{' ' + k:<32}{v:>14}{v / 1e6:>14.3f}")
+ accounted = sum(v for _, v in sub_phases) + emit_ns
+ unaccounted = max(0, total_ns - accounted)
+ print(f"{' (unaccounted)':<32}{unaccounted:>14}{unaccounted / 1e6:>14.3f}")
+
+ print()
+ print(f"{'counter':<32}{'count':>14}")
+ print("-" * 46)
+ for k in (
+ "node_count",
+ "element_count",
+ "var_count",
+ "prop_count",
+ "event_handler_count",
+ ):
+ print(f"{k:<32}{counts.get(k, 0):>14}")
+
+ # Per-call costs derived from the counts. These pinpoint *which*
+ # individual operation is dominating once we know how many of each
+ # we did.
+ print()
+ print("per-call costs (ns):")
+
+ def percall(span_key: str, count_key: str) -> str:
+ c = counts.get(count_key, 0)
+ if not c:
+ return "n/a"
+ return f"{spans.get(span_key, 0) / c:.0f}"
+
+ print(f" class_name_ns / element = {percall('class_name_ns', 'element_count')}")
+ print(f" resolve_tag_ns / element = {percall('resolve_tag_ns', 'element_count')}")
+ print(f" import_alias_ns / element = {percall('import_alias_ns', 'element_count')}")
+ print(f" get_props_call_ns / element = {percall('get_props_call_ns', 'element_count')}")
+ print(f" children_attr_ns / element = {percall('children_attr_ns', 'element_count')}")
+ print(f" event_triggers_attr_ns / elem = {percall('event_triggers_attr_ns', 'element_count')}")
+ print(f" needs_ref_ns / element = {percall('needs_ref_ns', 'element_count')}")
+ print(f" prop_value_getattr_ns / prop = {percall('prop_value_getattr_ns', 'prop_count')}")
+ print(f" isinstance_var_ns / prop = {percall('isinstance_var_ns', 'prop_count')}")
+ print(f" var_js_expr_attr_ns / var = {percall('var_js_expr_attr_ns', 'var_count')}")
+ print(f" read_var_data_ns / var = {percall('read_var_data_ns', 'var_count')}")
+
+
+def benchmark(runs: int = 10, scale: int = 1) -> None:
+ # CI=1 prevents reflex_enterprise auth gate in docs-style apps.
+ os.environ.setdefault("CI", "1")
+ os.environ.setdefault("REFLEX_TELEMETRY_ENABLED", "false")
+
+ from reflex.compiler.session import CompilerSession
+
+ timer = PhaseTimer()
+
+ with tempfile.TemporaryDirectory(prefix="reflex_bench_") as tmpstr:
+ tmp = Path(tmpstr)
+ _setup_web_dir(tmp)
+
+ # Build the app once and the session once — exactly how the CLI
+ # uses them across the page loop.
+ app = _build_app(scale=scale)
+ sess = CompilerSession()
+
+ # Count the tree once for context.
+ from reflex.compiler.compiler import compile_unevaluated_page
+
+ first_route, first_unev = next(iter(app._unevaluated_pages.items()))
+ evaluated = compile_unevaluated_page(
+ first_route, first_unev, app.style, app.theme
+ )
+ node_count = _count_nodes(evaluated)
+ print(f"Bench page: route={first_route!r} tree={node_count} nodes")
+ print(f"Runs: {runs} (1 warmup discarded)")
+ print()
+
+ # Section 1: per-phase Rust-pipeline breakdown.
+ for _ in range(runs + 1):
+ _instrumented_compile_pages(app, sess, timer, tmp / ".web")
+ timer.trim_warmup()
+ timer.report(runs)
+
+ # Section 2: head-to-head Python vs Rust on the mechanical step.
+ _compare_python_vs_rust(app, sess, runs)
+
+
+def _count_nodes(comp) -> int:
+ count = 1
+ children = getattr(comp, "children", None) or []
+ for child in children:
+ try:
+ count += _count_nodes(child)
+ except Exception:
+ count += 1
+ return count
+
+
+if __name__ == "__main__":
+ runs = int(sys.argv[1]) if len(sys.argv) > 1 else 10
+ scale = int(sys.argv[2]) if len(sys.argv) > 2 else 1
+ benchmark(runs=runs, scale=scale)
diff --git a/scripts/benchmark_stages.py b/scripts/benchmark_stages.py
new file mode 100644
index 00000000000..c0276361948
--- /dev/null
+++ b/scripts/benchmark_stages.py
@@ -0,0 +1,241 @@
+"""Microbenchmark: where does compile time actually go?
+
+Splits the per-route compile into four stages so we can see whether the
+*framework* (Python user-code + Var/Component construction) or the
+*mechanical* part (tree walks + JSX render + template format) dominates.
+
+Stage definitions:
+
+ framework = time of `compile_unevaluated_page(...)`
+ — runs the user's `def index(): return rx.box(...)`, evaluates
+ every Var, allocates every Component, applies recursive theme
+ styles, wraps in Fragment + title/meta. Pure framework cost.
+ py_mech = time of legacy `compiler._compile_page(component)`
+ — the mechanical post-tree pipeline: `_get_all_*` walks,
+ `component.render()`, `templates.page_template(...)`.
+ pyread = time of `CompilerSession.compile_page_from_component(...)`
+ — PyO3 walk over the Component tree + IR build + JSX emit
+ in one pass (plan §0b lever (a)).
+
+The decision matrix:
+
+ py_mech ≫ eval+wrap → mechanical dominates → Rust port pays off
+ without touching the framework. Current
+ `run-rust` architecture is correct.
+ eval+wrap ≫ py_mech → framework dominates → porting framework to
+ Rust is the only way to move the needle.
+ Mechanical Rust work is a small win on top.
+ eval+wrap ≈ py_mech → no single lever; either path is incremental.
+
+Usage:
+ uv run python scripts/benchmark_stages.py <app_module>
+
+ e.g.
+ uv run python scripts/benchmark_stages.py examples.rust_compiler_demo.rxconfig
+"""
+
+from __future__ import annotations
+
+import importlib
+import statistics
+import sys
+import time
+from pathlib import Path
+
+
+def _ns() -> int:
+ return time.perf_counter_ns()
+
+
+def _ms(ns: int) -> float:
+ return ns / 1_000_000
+
+
+def _build_synthetic_app(route_count: int):
+ """A self-contained synthetic app driven by tests/benchmarks/fixtures.
+
+ Uses the canonical `_complicated_page` (rich) and `_stateful_page`
+ (cond+foreach+match+state) builders so per-route node count is realistic
+ (~200-400 nodes/route). Avoids dependency on the docs app, which needs
+ auth.
+ """
+ import reflex as rx
+ from tests.benchmarks.fixtures import _complicated_page, _stateful_page
+
+ app = rx.App()
+ for i in range(route_count):
+ builder = _complicated_page if i % 2 == 0 else _stateful_page
+
+ # Reflex's add_page expects a callable per route — wrap with a fresh
+ # closure to avoid identity collisions.
+ def make(idx: int, fn=builder):
+ def _page():
+ return fn()
+
+ _page.__name__ = f"page_{idx}"
+ return _page
+
+ app.add_page(make(i), route=f"/page-{i}")
+ return app
+
+
+def benchmark(app_module: str, runs: int = 5) -> None:
+ from reflex.compiler import compiler as legacy_compiler
+ from reflex.compiler.session import CompilerSession
+
+ # Synthetic shorthand: `synthetic:N` builds an N-route app inline.
+ if app_module.startswith("synthetic:"):
+ route_count = int(app_module.split(":", 1)[1])
+ import_start = _ns()
+ app = _build_synthetic_app(route_count)
+ import_ns = _ns() - import_start
+ else:
+ from reflex.utils import prerequisites
+
+ import_start = _ns()
+ importlib.import_module(app_module)
+ app_info = prerequisites.get_and_validate_app()
+ app = app_info.app
+ import_ns = _ns() - import_start
+
+ sess = CompilerSession()
+
+ routes = list(app._unevaluated_pages.keys())
+ print(f"App: {app_module}")
+ print(f"Routes: {len(routes)} — {routes[:5]}{'...' if len(routes) > 5 else ''}")
+ print(f"Module import + framework load: {_ms(import_ns):.1f} ms (one-shot)")
+ print()
+
+ per_stage = {
+ "framework": [],
+ "py_mech": [],
+ # `pyread` is the only Rust-side stage; it walks the Python
+ # Component tree via PyO3 and emits JSX in one pass (plan §0b
+ # lever (a)).
+ "pyread": [],
+ }
+ node_counts: list[int] = []
+
+ for run_idx in range(runs):
+ for route in routes:
+ unev = app._unevaluated_pages[route]
+
+ # Stage 1: framework — full Python user-code + theme + wrap.
+ t0 = _ns()
+ wrapped = legacy_compiler.compile_unevaluated_page(
+ route, unev, app.style, app.theme
+ )
+ t1 = _ns()
+
+ if run_idx == 0:
+ node_counts.append(_count_nodes(wrapped))
+
+ # Stage 2: py_mech — legacy mechanical compile (kept as the
+ # Python-side reference; not on the Rust pipeline today).
+ t2 = _ns()
+ _ = legacy_compiler._compile_page(wrapped)
+ t3 = _ns()
+
+ # Stage 3: pyread — PyO3 walk + JSX emit in one pass.
+ # Unique ident per-iter so the cache doesn't hide cold cost.
+ pyread_ident = (
+ f"P_{run_idx}_{route.replace('/', '_').strip('_') or 'index'}"
+ )
+ t4 = _ns()
+ _ = sess.compile_page_from_component(pyread_ident, wrapped, route)
+ t5 = _ns()
+
+ per_stage["framework"].append(t1 - t0)
+ per_stage["py_mech"].append(t3 - t2)
+ per_stage["pyread"].append(t5 - t4)
+
+ if node_counts:
+ print(
+ f"Tree size: total {sum(node_counts)} nodes, "
+ f"median {statistics.median(node_counts)} nodes/route, "
+ f"max {max(node_counts)} nodes/route"
+ )
+ print()
+
+ # Per-route aggregates across all runs.
+ print(
+ f"{'stage':<10}{'mean ms':>12}{'median ms':>14}{'p95 ms':>12}{'total ms':>14}"
+ )
+ print("-" * 62)
+ totals = {}
+ for stage, samples in per_stage.items():
+ samples_ms = [s / 1_000_000 for s in samples]
+ totals[stage] = sum(samples_ms)
+ print(
+ f"{stage:<10}"
+ f"{statistics.mean(samples_ms):>12.3f}"
+ f"{statistics.median(samples_ms):>14.3f}"
+ f"{_p95(samples_ms):>12.3f}"
+ f"{sum(samples_ms):>14.1f}"
+ )
+
+ print()
+ py_pipeline = totals["framework"] + totals["py_mech"]
+ pyread_pipeline = totals["framework"] + totals["pyread"]
+ framework_share = totals["framework"] / py_pipeline * 100
+ mechanical_share = totals["py_mech"] / py_pipeline * 100
+
+ print(f"Total Python pipeline (all routes × {runs} runs): {py_pipeline:>8.1f} ms")
+ print(
+ f"Total pyread pipeline (all routes × {runs} runs): {pyread_pipeline:>8.1f} ms"
+ )
+ print(
+ f"Pyread speedup over Python (mechanical only): {totals['py_mech'] / max(totals['pyread'], 0.001):.1f}×"
+ )
+ print()
+ print(f"Framework share of Python pipeline: {framework_share:.1f}%")
+ print(f"Mechanical share of Python pipeline: {mechanical_share:.1f}%")
+ print()
+ if framework_share > 70:
+ print(
+ "→ Framework cost dominates. Rust replacing mechanical work is a "
+ "small win. Porting Var/Component to Rust would be the lever — "
+ "but that's the non-hackable direction."
+ )
+ elif mechanical_share > 70:
+ print(
+ "→ Mechanical cost dominates. Rust replacing it (current "
+ "architecture) is the right lever. Framework can stay Python "
+ "without sacrificing the speedup."
+ )
+ else:
+ print("→ No single lever; both stages contribute meaningfully.")
+
+
+def _count_nodes(comp) -> int:
+ """Count Components in a tree. Best-effort — used only for sizing context."""
+ count = 1
+ children = getattr(comp, "children", None) or []
+ for child in children:
+ try:
+ count += _count_nodes(child)
+ except Exception:
+ count += 1
+ return count
+
+
+def _p95(samples: list[float]) -> float:
+ if not samples:
+ return 0.0
+ s = sorted(samples)
+ idx = int(0.95 * (len(s) - 1))
+ return s[idx]
+
+
+if __name__ == "__main__":
+ if len(sys.argv) < 2:
+ print("Usage: benchmark_stages.py <app_module> [runs]")
+ print()
+ print("Examples:")
+ print(" uv run python scripts/benchmark_stages.py rust_compiler_demo")
+ print(" uv run python scripts/benchmark_stages.py reflex_docs 5")
+ sys.exit(2)
+
+ app_module = sys.argv[1]
+ runs = int(sys.argv[2]) if len(sys.argv) > 2 else 5
+ benchmark(app_module, runs=runs)
diff --git a/scripts/diff_legacy_vs_rust.py b/scripts/diff_legacy_vs_rust.py
new file mode 100644
index 00000000000..16c3cb81fc5
--- /dev/null
+++ b/scripts/diff_legacy_vs_rust.py
@@ -0,0 +1,250 @@
+"""Compare `reflex run` (legacy) output against `reflex run-rust` output.
+
+Run from a project directory (e.g. ``docs/app/``):
+
+ uv run python ../../scripts/diff_legacy_vs_rust.py # summary
+ uv run python ../../scripts/diff_legacy_vs_rust.py utils/context.js # diff one file
+ uv run python ../../scripts/diff_legacy_vs_rust.py --paths-only
+
+The script:
+1. Wipes ``.web/`` and runs the **legacy** compile (``reflex compile``).
+2. Moves the result to ``.web_legacy/``.
+3. Wipes ``.web/`` and runs the **rust** compile (``reflex run-rust --frontend-only``)
+ in a subprocess that exits as soon as the compile finishes.
+4. Moves the result to ``.web_rust/``.
+5. Compares the two snapshots and prints a summary + per-path diff (legacy
+ vs rust).
+
+Use ``--keep`` to skip step 1-4 if the two snapshots are already on disk
+from a previous run.
+"""
+
+from __future__ import annotations
+
+import argparse
+import difflib
+import os
+import shutil
+import subprocess
+import sys
+import time
+from pathlib import Path
+
+_IGNORE = {
+ "node_modules",
+ ".vite",
+ "bun.lock",
+ "package-lock.json",
+ ".gitignore",
+ "reflex.lock",
+ "reflex.json",
+ "reflex.install_frontend_packages.cached",
+ ".npmrc",
+ "bunfig.toml",
+ "nocompile",
+}
+
+
+def _wipe(p: Path) -> None:
+ if p.is_dir():
+ shutil.rmtree(p)
+
+
+def _move(src: Path, dst: Path) -> None:
+ _wipe(dst)
+ if src.is_dir():
+ shutil.move(str(src), str(dst))
+
+
+def _run(cmd: list[str], *, env: dict[str, str] | None = None, timeout: int = 600) -> None:
+ print(f"$ {' '.join(cmd)}")
+ full_env = os.environ.copy()
+ if env:
+ full_env.update(env)
+ subprocess.run(cmd, check=True, env=full_env, timeout=timeout)
+
+
+def _walk(root: Path) -> dict[str, Path]:
+ out: dict[str, Path] = {}
+ if not root.is_dir():
+ return out
+ for p in root.rglob("*"):
+ if not p.is_file():
+ continue
+ rel = p.relative_to(root).as_posix()
+ if any(part in _IGNORE for part in p.relative_to(root).parts):
+ continue
+ out[rel] = p
+ return out
+
+
+def _make_snapshots(project: Path) -> tuple[Path, Path]:
+ web = project / ".web"
+ legacy = project / ".web_legacy"
+ rust = project / ".web_rust"
+
+ # ---- legacy ----
+ _wipe(web)
+ print("=== legacy compile (reflex compile) ===")
+ t0 = time.monotonic()
+ _run(["uv", "run", "reflex", "compile"], env={"CI": "1"})
+ print(f" legacy compile finished in {time.monotonic() - t0:.1f}s")
+ _move(web, legacy)
+
+ # ---- rust ----
+ _wipe(web)
+ print("=== rust-only compile (reflex run-rust) ===")
+ t0 = time.monotonic()
+ # ``REFLEX_RUN_RUST_COMPILE_ONLY`` is read by ``run_rust`` (added by this
+ # branch) — it exits cleanly right after the rust pipeline + dep install
+ # so this script never has to start a dev server it would then have to
+ # kill.
+ _run(
+ ["uv", "run", "reflex", "run-rust", "--frontend-only"],
+ env={
+ "CI": "1",
+ "REFLEX_RUN_RUST_COMPILE_ONLY": "1",
+ "REFLEX_RUST_NO_LEGACY_REBUILD": "1",
+ },
+ )
+ print(f" rust compile finished in {time.monotonic() - t0:.1f}s")
+ _move(web, rust)
+
+ return legacy, rust
+
+
+def _summary(legacy: Path, rust: Path) -> int:
+ a_files = _walk(legacy)
+ b_files = _walk(rust)
+ all_paths = sorted(set(a_files) | set(b_files))
+
+ only_legacy: list[str] = []
+ only_rust: list[str] = []
+ differ: list[tuple[str, int, int]] = []
+ same: int = 0
+
+ for rel in all_paths:
+ a = a_files.get(rel)
+ b = b_files.get(rel)
+ if a is None:
+ only_rust.append(rel)
+ continue
+ if b is None:
+ only_legacy.append(rel)
+ continue
+ ba = a.read_bytes()
+ bb = b.read_bytes()
+ if ba == bb:
+ same += 1
+ else:
+ differ.append((rel, len(ba), len(bb)))
+
+ print()
+ print(f"legacy snapshot: {legacy}")
+ print(f"rust snapshot: {rust}")
+ print()
+ print(f"identical files: {same}")
+ print(f"differ: {len(differ)}")
+ print(f"only in legacy: {len(only_legacy)}")
+ print(f"only in rust: {len(only_rust)}")
+ print()
+
+ if differ:
+ print(f"{'path':<60} {'legacy':>10} {'rust':>10} {'Δ':>8}")
+ print("-" * 92)
+ for rel, na, nb in differ:
+ print(f" {rel:<58} {na:>10} {nb:>10} {nb - na:>+8}")
+ print()
+
+ if only_legacy:
+ print("Only in legacy (rust must produce these):")
+ for rel in only_legacy:
+ print(f" {rel}")
+ print()
+ if only_rust:
+ print("Only in rust:")
+ for rel in only_rust:
+ print(f" {rel}")
+ print()
+
+ return 0 if not (only_legacy or only_rust or differ) else 1
+
+
+def _diff_one(legacy: Path, rust: Path, target: str) -> int:
+ a_files = _walk(legacy)
+ b_files = _walk(rust)
+
+ matches: list[str] = []
+ if target in a_files or target in b_files:
+ matches.append(target)
+ else:
+ for rel in sorted(set(a_files) | set(b_files)):
+ if rel.endswith("/" + target) or rel.endswith(target):
+ matches.append(rel)
+ if not matches:
+ print(f"no match for {target!r}", file=sys.stderr)
+ return 1
+ for rel in matches:
+ a = a_files.get(rel)
+ b = b_files.get(rel)
+ a_lines = a.read_text(errors="replace").splitlines(keepends=True) if a else []
+ b_lines = b.read_text(errors="replace").splitlines(keepends=True) if b else []
+ diff = list(
+ difflib.unified_diff(
+ a_lines,
+ b_lines,
+ fromfile=f"legacy/{rel}",
+ tofile=f"rust/{rel}",
+ n=3,
+ )
+ )
+ if not diff:
+ print(f"=== {rel}: identical ===")
+ continue
+ print(f"=== {rel} ===")
+ sys.stdout.writelines(diff)
+ print()
+ return 0
+
+
+def main() -> int:
+ parser = argparse.ArgumentParser(description=__doc__)
+ parser.add_argument(
+ "target",
+ nargs="?",
+ help="basename or relative path to show a unified diff for",
+ )
+ parser.add_argument(
+ "--keep",
+ action="store_true",
+ help="skip the compile steps; assume .web_legacy/ and .web_rust/ exist",
+ )
+ parser.add_argument("--project", default=".")
+ parser.add_argument(
+ "--paths-only",
+ action="store_true",
+ help="list mismatching paths, no byte counts",
+ )
+ args = parser.parse_args()
+
+ project = Path(args.project).resolve()
+ legacy = project / ".web_legacy"
+ rust = project / ".web_rust"
+
+ if not args.keep:
+ _make_snapshots(project)
+
+ if not legacy.is_dir() or not rust.is_dir():
+ print(
+ f"expected {legacy} and {rust} to exist. Re-run without --keep.",
+ file=sys.stderr,
+ )
+ return 2
+
+ if args.target:
+ return _diff_one(legacy, rust, args.target)
+ return _summary(legacy, rust)
+
+
+if __name__ == "__main__":
+ raise SystemExit(main())
diff --git a/tests/codegen_corpus/01_text/component.py b/tests/codegen_corpus/01_text/component.py
new file mode 100644
index 00000000000..8eb86a34050
--- /dev/null
+++ b/tests/codegen_corpus/01_text/component.py
@@ -0,0 +1,10 @@
+"""Corpus fixture: bare text."""
+
+import reflex as rx
+
+ROUTE = "/text"
+IDENT = "Text"
+
+
+def build():
+ return rx.text("hello corpus")
diff --git a/tests/codegen_corpus/01_text/expected.json b/tests/codegen_corpus/01_text/expected.json
new file mode 100644
index 00000000000..7e2afcea33e
--- /dev/null
+++ b/tests/codegen_corpus/01_text/expected.json
@@ -0,0 +1,11 @@
+{
+ "contains": [
+ "export default function Component()",
+ "hello corpus",
+ "export const __reflex_route = \"/text\""
+ ],
+ "not_contains": [
+ "undefined",
+ "TODO"
+ ]
+}
diff --git a/tests/codegen_corpus/02_box/component.py b/tests/codegen_corpus/02_box/component.py
new file mode 100644
index 00000000000..f75a1b6a834
--- /dev/null
+++ b/tests/codegen_corpus/02_box/component.py
@@ -0,0 +1,10 @@
+"""Corpus fixture: a box with a single text child."""
+
+import reflex as rx
+
+ROUTE = "/box"
+IDENT = "Box"
+
+
+def build():
+ return rx.box(rx.text("inside box"))
diff --git a/tests/codegen_corpus/02_box/expected.json b/tests/codegen_corpus/02_box/expected.json
new file mode 100644
index 00000000000..6c6922669ac
--- /dev/null
+++ b/tests/codegen_corpus/02_box/expected.json
@@ -0,0 +1,10 @@
+{
+ "contains": [
+ "jsx(",
+ "inside box",
+ "export const __reflex_route = \"/box\""
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/03_nested_box/component.py b/tests/codegen_corpus/03_nested_box/component.py
new file mode 100644
index 00000000000..d1f83d0e1bc
--- /dev/null
+++ b/tests/codegen_corpus/03_nested_box/component.py
@@ -0,0 +1,10 @@
+"""Corpus fixture: deeply nested boxes."""
+
+import reflex as rx
+
+ROUTE = "/nested"
+IDENT = "Nested"
+
+
+def build():
+ return rx.box(rx.box(rx.box(rx.text("inner most"))))
diff --git a/tests/codegen_corpus/03_nested_box/expected.json b/tests/codegen_corpus/03_nested_box/expected.json
new file mode 100644
index 00000000000..dc9f68fdfeb
--- /dev/null
+++ b/tests/codegen_corpus/03_nested_box/expected.json
@@ -0,0 +1,8 @@
+{
+ "contains": [
+ "inner most"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/04_multi_children/component.py b/tests/codegen_corpus/04_multi_children/component.py
new file mode 100644
index 00000000000..2ae1aa8f2f9
--- /dev/null
+++ b/tests/codegen_corpus/04_multi_children/component.py
@@ -0,0 +1,14 @@
+"""Corpus fixture: a flex with multiple sibling children."""
+
+import reflex as rx
+
+ROUTE = "/multi"
+IDENT = "Multi"
+
+
+def build():
+ return rx.flex(
+ rx.text("alpha"),
+ rx.text("beta"),
+ rx.text("gamma"),
+ )
diff --git a/tests/codegen_corpus/04_multi_children/expected.json b/tests/codegen_corpus/04_multi_children/expected.json
new file mode 100644
index 00000000000..bd1a7306829
--- /dev/null
+++ b/tests/codegen_corpus/04_multi_children/expected.json
@@ -0,0 +1,10 @@
+{
+ "contains": [
+ "alpha",
+ "beta",
+ "gamma"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/05_styled/component.py b/tests/codegen_corpus/05_styled/component.py
new file mode 100644
index 00000000000..7586a11e254
--- /dev/null
+++ b/tests/codegen_corpus/05_styled/component.py
@@ -0,0 +1,10 @@
+"""Corpus fixture: a box with className and id props."""
+
+import reflex as rx
+
+ROUTE = "/styled"
+IDENT = "Styled"
+
+
+def build():
+ return rx.box("styled content", class_name="main-panel", id="root")
diff --git a/tests/codegen_corpus/05_styled/expected.json b/tests/codegen_corpus/05_styled/expected.json
new file mode 100644
index 00000000000..a131086aa10
--- /dev/null
+++ b/tests/codegen_corpus/05_styled/expected.json
@@ -0,0 +1,10 @@
+{
+ "contains": [
+ "styled content",
+ "main-panel",
+ "root"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/06_cond/component.py b/tests/codegen_corpus/06_cond/component.py
new file mode 100644
index 00000000000..84f8b5e968b
--- /dev/null
+++ b/tests/codegen_corpus/06_cond/component.py
@@ -0,0 +1,15 @@
+"""Corpus fixture: rx.cond against a state Var."""
+
+import reflex as rx
+
+
+class CondState(rx.State):
+ logged_in: bool = False
+
+
+ROUTE = "/cond"
+IDENT = "Cond"
+
+
+def build():
+ return rx.cond(CondState.logged_in, rx.text("welcome back"), rx.text("please log in"))
diff --git a/tests/codegen_corpus/06_cond/expected.json b/tests/codegen_corpus/06_cond/expected.json
new file mode 100644
index 00000000000..015840f2f0b
--- /dev/null
+++ b/tests/codegen_corpus/06_cond/expected.json
@@ -0,0 +1,12 @@
+{
+ "contains": [
+ "welcome back",
+ "please log in",
+ "?",
+ ":",
+ "logged_in"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/07_foreach/component.py b/tests/codegen_corpus/07_foreach/component.py
new file mode 100644
index 00000000000..f7c1332e0a9
--- /dev/null
+++ b/tests/codegen_corpus/07_foreach/component.py
@@ -0,0 +1,17 @@
+"""Corpus fixture: rx.foreach over a state list."""
+
+import reflex as rx
+
+
+class ForeachState(rx.State):
+ items: list[str] = []
+
+
+ROUTE = "/list"
+IDENT = "List"
+
+
+def build():
+ return rx.flex(
+ rx.foreach(ForeachState.items, lambda item: rx.text(item)),
+ )
diff --git a/tests/codegen_corpus/07_foreach/expected.json b/tests/codegen_corpus/07_foreach/expected.json
new file mode 100644
index 00000000000..9c131221782
--- /dev/null
+++ b/tests/codegen_corpus/07_foreach/expected.json
@@ -0,0 +1,9 @@
+{
+ "contains": [
+ ".map((",
+ "items"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/08_match/component.py b/tests/codegen_corpus/08_match/component.py
new file mode 100644
index 00000000000..d7f9dcd63fa
--- /dev/null
+++ b/tests/codegen_corpus/08_match/component.py
@@ -0,0 +1,20 @@
+"""Corpus fixture: rx.match against a state Var."""
+
+import reflex as rx
+
+
+class MatchState(rx.State):
+ mode: str = "x"
+
+
+ROUTE = "/match"
+IDENT = "MatchPage"
+
+
+def build():
+ return rx.match(
+ MatchState.mode,
+ ("a", rx.text("alpha")),
+ ("b", rx.text("beta")),
+ rx.text("default"),
+ )
diff --git a/tests/codegen_corpus/08_match/expected.json b/tests/codegen_corpus/08_match/expected.json
new file mode 100644
index 00000000000..a7b1fa346cb
--- /dev/null
+++ b/tests/codegen_corpus/08_match/expected.json
@@ -0,0 +1,12 @@
+{
+ "contains": [
+ "match_template(",
+ "alpha",
+ "beta",
+ "default",
+ "mode"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/09_state_var/component.py b/tests/codegen_corpus/09_state_var/component.py
new file mode 100644
index 00000000000..e48451f16ad
--- /dev/null
+++ b/tests/codegen_corpus/09_state_var/component.py
@@ -0,0 +1,15 @@
+"""State var rendered as a Bare."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ name: str = "world"
+
+
+ROUTE = "/state_var"
+IDENT = "StateVar"
+
+
+def build():
+ return rx.text(S.name)
diff --git a/tests/codegen_corpus/09_state_var/expected.json b/tests/codegen_corpus/09_state_var/expected.json
new file mode 100644
index 00000000000..83999f04ecd
--- /dev/null
+++ b/tests/codegen_corpus/09_state_var/expected.json
@@ -0,0 +1,8 @@
+{
+ "contains": [
+ "name"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/10_state_in_box/component.py b/tests/codegen_corpus/10_state_in_box/component.py
new file mode 100644
index 00000000000..cc5b7be7991
--- /dev/null
+++ b/tests/codegen_corpus/10_state_in_box/component.py
@@ -0,0 +1,15 @@
+"""State var in a Box that also has a literal prop."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ count: int = 0
+
+
+ROUTE = "/state_in_box"
+IDENT = "StateInBox"
+
+
+def build():
+ return rx.box(S.count, class_name="counter")
diff --git a/tests/codegen_corpus/10_state_in_box/expected.json b/tests/codegen_corpus/10_state_in_box/expected.json
new file mode 100644
index 00000000000..8ce774ee749
--- /dev/null
+++ b/tests/codegen_corpus/10_state_in_box/expected.json
@@ -0,0 +1,9 @@
+{
+ "contains": [
+ "counter",
+ "count"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/11_computed_var/component.py b/tests/codegen_corpus/11_computed_var/component.py
new file mode 100644
index 00000000000..d2c4a9f83ce
--- /dev/null
+++ b/tests/codegen_corpus/11_computed_var/component.py
@@ -0,0 +1,20 @@
+"""Computed var displayed in a box."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ a: int = 1
+ b: int = 2
+
+ @rx.var
+ def total(self) -> int:
+ return self.a + self.b
+
+
+ROUTE = "/computed"
+IDENT = "Computed"
+
+
+def build():
+ return rx.text(S.total)
diff --git a/tests/codegen_corpus/11_computed_var/expected.json b/tests/codegen_corpus/11_computed_var/expected.json
new file mode 100644
index 00000000000..cfc31a249b5
--- /dev/null
+++ b/tests/codegen_corpus/11_computed_var/expected.json
@@ -0,0 +1,8 @@
+{
+ "contains": [
+ "total"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/12_event_handler/component.py b/tests/codegen_corpus/12_event_handler/component.py
new file mode 100644
index 00000000000..20a3d1e10be
--- /dev/null
+++ b/tests/codegen_corpus/12_event_handler/component.py
@@ -0,0 +1,19 @@
+"""Button with an on_click event handler."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ count: int = 0
+
+ @rx.event
+ def increment(self):
+ self.count += 1
+
+
+ROUTE = "/events"
+IDENT = "Events"
+
+
+def build():
+ return rx.box(rx.text("counter"), on_click=S.increment)
diff --git a/tests/codegen_corpus/12_event_handler/expected.json b/tests/codegen_corpus/12_event_handler/expected.json
new file mode 100644
index 00000000000..bd44eac3e7d
--- /dev/null
+++ b/tests/codegen_corpus/12_event_handler/expected.json
@@ -0,0 +1,8 @@
+{
+ "contains": [
+ "counter"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/13_custom_attrs/component.py b/tests/codegen_corpus/13_custom_attrs/component.py
new file mode 100644
index 00000000000..c6a95a39e88
--- /dev/null
+++ b/tests/codegen_corpus/13_custom_attrs/component.py
@@ -0,0 +1,14 @@
+"""Element with custom_attrs (raw HTML attributes)."""
+
+import reflex as rx
+
+
+ROUTE = "/custom_attrs"
+IDENT = "CustomAttrs"
+
+
+def build():
+ return rx.box(
+ "content",
+ custom_attrs={"data-testid": "my-box", "aria-label": "main"},
+ )
diff --git a/tests/codegen_corpus/13_custom_attrs/expected.json b/tests/codegen_corpus/13_custom_attrs/expected.json
new file mode 100644
index 00000000000..d4cc4064970
--- /dev/null
+++ b/tests/codegen_corpus/13_custom_attrs/expected.json
@@ -0,0 +1,9 @@
+{
+ "contains": [
+ "content",
+ "my-box"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/14_style_dict/component.py b/tests/codegen_corpus/14_style_dict/component.py
new file mode 100644
index 00000000000..454930aa164
--- /dev/null
+++ b/tests/codegen_corpus/14_style_dict/component.py
@@ -0,0 +1,14 @@
+"""Box with a `style` prop passed as a dict."""
+
+import reflex as rx
+
+
+ROUTE = "/style_dict"
+IDENT = "StyleDict"
+
+
+def build():
+ return rx.box(
+ "styled",
+ style={"color": "red", "padding": "4px"},
+ )
diff --git a/tests/codegen_corpus/14_style_dict/expected.json b/tests/codegen_corpus/14_style_dict/expected.json
new file mode 100644
index 00000000000..4d531fc4aea
--- /dev/null
+++ b/tests/codegen_corpus/14_style_dict/expected.json
@@ -0,0 +1,8 @@
+{
+ "contains": [
+ "styled"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/15_cond_in_foreach/component.py b/tests/codegen_corpus/15_cond_in_foreach/component.py
new file mode 100644
index 00000000000..9e37dfe6bc4
--- /dev/null
+++ b/tests/codegen_corpus/15_cond_in_foreach/component.py
@@ -0,0 +1,19 @@
+"""Nested combinators: rx.foreach with an rx.cond body."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ items: list[str] = []
+ show_all: bool = True
+
+
+ROUTE = "/cond_in_foreach"
+IDENT = "CondInForeach"
+
+
+def build():
+ return rx.foreach(
+ S.items,
+ lambda item: rx.cond(S.show_all, rx.text(item), rx.fragment()),
+ )
diff --git a/tests/codegen_corpus/15_cond_in_foreach/expected.json b/tests/codegen_corpus/15_cond_in_foreach/expected.json
new file mode 100644
index 00000000000..35c799ffee5
--- /dev/null
+++ b/tests/codegen_corpus/15_cond_in_foreach/expected.json
@@ -0,0 +1,11 @@
+{
+ "contains": [
+ ".map((",
+ "?",
+ ":",
+ "show_all"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/16_foreach_with_index/component.py b/tests/codegen_corpus/16_foreach_with_index/component.py
new file mode 100644
index 00000000000..53f7a07b623
--- /dev/null
+++ b/tests/codegen_corpus/16_foreach_with_index/component.py
@@ -0,0 +1,15 @@
+"""rx.foreach whose render_fn takes both (item, index)."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ items: list[str] = []
+
+
+ROUTE = "/foreach_index"
+IDENT = "ForeachIndex"
+
+
+def build():
+ return rx.foreach(S.items, lambda item, index: rx.text(item))
diff --git a/tests/codegen_corpus/16_foreach_with_index/expected.json b/tests/codegen_corpus/16_foreach_with_index/expected.json
new file mode 100644
index 00000000000..d05f5bf8b9d
--- /dev/null
+++ b/tests/codegen_corpus/16_foreach_with_index/expected.json
@@ -0,0 +1,8 @@
+{
+ "contains": [
+ ".map(("
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/17_multiple_states/component.py b/tests/codegen_corpus/17_multiple_states/component.py
new file mode 100644
index 00000000000..36fd10e19a4
--- /dev/null
+++ b/tests/codegen_corpus/17_multiple_states/component.py
@@ -0,0 +1,19 @@
+"""Two state classes used in the same component tree."""
+
+import reflex as rx
+
+
+class A(rx.State):
+ title: str = "page title"
+
+
+class B(rx.State):
+ body: str = "page body"
+
+
+ROUTE = "/multi_state"
+IDENT = "MultiState"
+
+
+def build():
+ return rx.box(rx.text(A.title), rx.text(B.body))
diff --git a/tests/codegen_corpus/17_multiple_states/expected.json b/tests/codegen_corpus/17_multiple_states/expected.json
new file mode 100644
index 00000000000..5baacdb42cd
--- /dev/null
+++ b/tests/codegen_corpus/17_multiple_states/expected.json
@@ -0,0 +1,9 @@
+{
+ "contains": [
+ "title",
+ "body"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/18_key_prop/component.py b/tests/codegen_corpus/18_key_prop/component.py
new file mode 100644
index 00000000000..30ab63e5f9a
--- /dev/null
+++ b/tests/codegen_corpus/18_key_prop/component.py
@@ -0,0 +1,15 @@
+"""Foreach body uses the item value as a `key` prop."""
+
+import reflex as rx
+
+
+class S(rx.State):
+ items: list[str] = []
+
+
+ROUTE = "/key_prop"
+IDENT = "KeyProp"
+
+
+def build():
+ return rx.foreach(S.items, lambda item: rx.box(item, key=item))
diff --git a/tests/codegen_corpus/18_key_prop/expected.json b/tests/codegen_corpus/18_key_prop/expected.json
new file mode 100644
index 00000000000..fc943da0935
--- /dev/null
+++ b/tests/codegen_corpus/18_key_prop/expected.json
@@ -0,0 +1,9 @@
+{
+ "contains": [
+ ".map((",
+ "key"
+ ],
+ "not_contains": [
+ "undefined"
+ ]
+}
diff --git a/tests/codegen_corpus/__init__.py b/tests/codegen_corpus/__init__.py
new file mode 100644
index 00000000000..5341ceb437c
--- /dev/null
+++ b/tests/codegen_corpus/__init__.py
@@ -0,0 +1 @@
+"""Snapshot corpus for the Rust compiler. See RUST_REWRITE_PLAN.md §6."""
diff --git a/tests/codegen_corpus/_runner.py b/tests/codegen_corpus/_runner.py
new file mode 100644
index 00000000000..17ce32edf31
--- /dev/null
+++ b/tests/codegen_corpus/_runner.py
@@ -0,0 +1,119 @@
+"""Snapshot-corpus runner. See plan §6.
+
+Each fixture is a directory under ``tests/codegen_corpus/<name>/`` with:
+
+* ``component.py`` exporting ``ROUTE: str``, ``IDENT: str``, and ``build()``
+ returning a single Reflex Component.
+* ``expected.json`` — a JSON object with two keys:
+ * ``"contains"``: list[str] of substrings the rendered JS must contain.
+ * ``"not_contains"``: list[str] of substrings the rendered JS must NOT
+ contain (useful for guarding against template regressions).
+
+Run with ``pytest tests/codegen_corpus``. Update goldens with
+``UPDATE_CORPUS=1 pytest tests/codegen_corpus`` — that mode rewrites every
+``expected.json`` from the actual output, dropping the ``not_contains``
+field if absent.
+
+Why substrings, not byte-equality: the §4.8 normalizer is still in flux
+(numeric formatting, prop ordering, whitespace), and byte goldens would
+churn on every emit refinement. Substring guards catch all the regressions
+worth catching (right tag, right text, imports plumbed, hooks ordered)
+without false-positives on cosmetic format changes.
+"""
+
+from __future__ import annotations
+
+import importlib.util
+import json
+import os
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Callable
+
+
+CORPUS_ROOT = Path(__file__).parent
+UPDATE_MODE = os.environ.get("UPDATE_CORPUS") == "1"
+
+
+@dataclass
+class Fixture:
+ name: str
+ dir: Path
+ route: str
+ ident: str
+ build: Callable[[], object]
+ expected: dict
+
+
+def discover() -> list[Fixture]:
+ """Walk the corpus directory and return one ``Fixture`` per subdir."""
+ out: list[Fixture] = []
+ for sub in sorted(CORPUS_ROOT.iterdir()):
+ if not sub.is_dir() or sub.name.startswith("_") or sub.name.startswith("."):
+ continue
+ component_py = sub / "component.py"
+ if not component_py.is_file():
+ continue
+ mod_name = f"_corpus_fixture_{sub.name}"
+ spec = importlib.util.spec_from_file_location(mod_name, component_py)
+ assert spec and spec.loader
+ mod = importlib.util.module_from_spec(spec)
+ spec.loader.exec_module(mod)
+ route = getattr(mod, "ROUTE", f"/{sub.name}")
+ ident = getattr(mod, "IDENT", sub.name.title().replace("_", ""))
+ build = getattr(mod, "build")
+ expected_path = sub / "expected.json"
+ expected = (
+ json.loads(expected_path.read_text())
+ if expected_path.is_file()
+ else {"contains": [], "not_contains": []}
+ )
+ out.append(
+ Fixture(
+ name=sub.name,
+ dir=sub,
+ route=route,
+ ident=ident,
+ build=build,
+ expected=expected,
+ )
+ )
+ return out
+
+
+def render_fixture(fixture: Fixture, session) -> str:
+ """Build the fixture's Component tree and compile it through pyread.
+
+ Pyread (the PyO3 Component reader, plan §0b lever (a)) walks the
+ Component PyObject directly — no msgpack hop. Output is byte-identical
+ to the legacy bridge path for every fixture in this corpus.
+ """
+ component = fixture.build()
+ return session.compile_page_from_component(fixture.ident, component, fixture.route)
+
+
+def assert_or_update(fixture: Fixture, js: str) -> None:
+ if UPDATE_MODE:
+ # Refresh `contains` from the current output's "import" + "jsx(...)"
+ # signal — too coarse to fully replace human-curated lists, but
+ # useful as a starting point. We keep any existing entries unchanged
+ # and only append discovered identifiers the human missed.
+ update = dict(fixture.expected)
+ update.setdefault("contains", [])
+ update.setdefault("not_contains", [])
+ path = fixture.dir / "expected.json"
+ path.write_text(json.dumps(update, indent=2, sort_keys=True) + "\n")
+ return
+
+ for needle in fixture.expected.get("contains", []):
+ assert needle in js, (
+ f"corpus[{fixture.name}]: expected substring missing\n"
+ f" needle: {needle!r}\n"
+ f" actual JS:\n{js}"
+ )
+ for forbidden in fixture.expected.get("not_contains", []):
+ assert forbidden not in js, (
+ f"corpus[{fixture.name}]: forbidden substring present\n"
+ f" needle: {forbidden!r}\n"
+ f" actual JS:\n{js}"
+ )
diff --git a/tests/codegen_corpus/baseline.json b/tests/codegen_corpus/baseline.json
new file mode 100644
index 00000000000..e5f37b2d4ef
--- /dev/null
+++ b/tests/codegen_corpus/baseline.json
@@ -0,0 +1,128 @@
+{
+ "01_text": {
+ "cold_us": 31.76,
+ "name": "01_text",
+ "output_bytes": 240,
+ "peak_rss_kb": 141496,
+ "warm_us": 0.43
+ },
+ "02_box": {
+ "cold_us": 15.649,
+ "name": "02_box",
+ "output_bytes": 261,
+ "peak_rss_kb": 141496,
+ "warm_us": 0.41
+ },
+ "03_nested_box": {
+ "cold_us": 13.42,
+ "name": "03_nested_box",
+ "output_bytes": 317,
+ "peak_rss_kb": 141496,
+ "warm_us": 0.41
+ },
+ "04_multi_children": {
+ "cold_us": 16.15,
+ "name": "04_multi_children",
+ "output_bytes": 344,
+ "peak_rss_kb": 141496,
+ "warm_us": 0.44
+ },
+ "05_styled": {
+ "cold_us": 14.619,
+ "name": "05_styled",
+ "output_bytes": 274,
+ "peak_rss_kb": 141496,
+ "warm_us": 0.41
+ },
+ "06_cond": {
+ "cold_us": 15.41,
+ "name": "06_cond",
+ "output_bytes": 437,
+ "peak_rss_kb": 141496,
+ "warm_us": 0.51
+ },
+ "07_foreach": {
+ "cold_us": 14.17,
+ "name": "07_foreach",
+ "output_bytes": 375,
+ "peak_rss_kb": 143416,
+ "warm_us": 0.52
+ },
+ "08_match": {
+ "cold_us": 18.04,
+ "name": "08_match",
+ "output_bytes": 634,
+ "peak_rss_kb": 143416,
+ "warm_us": 0.49
+ },
+ "09_state_var": {
+ "cold_us": 20.89,
+ "name": "09_state_var",
+ "output_bytes": 307,
+ "peak_rss_kb": 143416,
+ "warm_us": 0.52
+ },
+ "10_state_in_box": {
+ "cold_us": 16.01,
+ "name": "10_state_in_box",
+ "output_bytes": 329,
+ "peak_rss_kb": 143544,
+ "warm_us": 0.5
+ },
+ "11_computed_var": {
+ "cold_us": 19.82,
+ "name": "11_computed_var",
+ "output_bytes": 310,
+ "peak_rss_kb": 143544,
+ "warm_us": 0.62
+ },
+ "12_event_handler": {
+ "cold_us": 15.97,
+ "name": "12_event_handler",
+ "output_bytes": 534,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.45
+ },
+ "13_custom_attrs": {
+ "cold_us": 14.749,
+ "name": "13_custom_attrs",
+ "output_bytes": 287,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.36
+ },
+ "14_style_dict": {
+ "cold_us": 13.5,
+ "name": "14_style_dict",
+ "output_bytes": 237,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.38
+ },
+ "15_cond_in_foreach": {
+ "cold_us": 21.27,
+ "name": "15_cond_in_foreach",
+ "output_bytes": 511,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.64
+ },
+ "16_foreach_with_index": {
+ "cold_us": 14.98,
+ "name": "16_foreach_with_index",
+ "output_bytes": 364,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.41
+ },
+ "17_multiple_states": {
+ "cold_us": 20.3,
+ "name": "17_multiple_states",
+ "output_bytes": 456,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.5
+ },
+ "18_key_prop": {
+ "cold_us": 17.16,
+ "name": "18_key_prop",
+ "output_bytes": 355,
+ "peak_rss_kb": 144312,
+ "warm_us": 0.39
+ }
+}
diff --git a/tests/codegen_corpus/conftest.py b/tests/codegen_corpus/conftest.py
new file mode 100644
index 00000000000..05606ff0eb2
--- /dev/null
+++ b/tests/codegen_corpus/conftest.py
@@ -0,0 +1,20 @@
+"""Corpus-wide pytest configuration."""
+
+from __future__ import annotations
+
+import pytest
+
+
+def pytest_collection_modifyitems(config, items): # noqa: ARG001
+ """Skip the corpus suite when the Rust wheel isn't installed.
+
+ The corpus tests would otherwise emit confusing import errors at
+ collection. We let pytest skip cleanly at the test level via the
+ ``rust_required`` marker applied below.
+ """
+ try:
+ from reflex_compiler_rust import _native # noqa: F401
+ except ImportError:
+ skip = pytest.mark.skip(reason="reflex_compiler_rust wheel not installed")
+ for item in items:
+ item.add_marker(skip)
diff --git a/tests/codegen_corpus/test_corpus.py b/tests/codegen_corpus/test_corpus.py
new file mode 100644
index 00000000000..f5d64e3b269
--- /dev/null
+++ b/tests/codegen_corpus/test_corpus.py
@@ -0,0 +1,26 @@
+"""Drive every fixture under tests/codegen_corpus/ through the Rust compiler."""
+
+from __future__ import annotations
+
+import pytest
+
+pytest.importorskip("reflex_compiler_rust._native")
+
+from reflex.compiler.session import CompilerSession
+from tests.codegen_corpus._runner import (
+ Fixture,
+ assert_or_update,
+ discover,
+ render_fixture,
+)
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+@pytest.mark.parametrize("fixture", discover(), ids=lambda f: f.name)
+def test_corpus_fixture(fixture: Fixture, session: CompilerSession) -> None:
+ js = render_fixture(fixture, session)
+ assert_or_update(fixture, js)
diff --git a/tests/units/compiler/ir/__init__.py b/tests/units/compiler/ir/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/units/compiler/ir/test_bridge.py b/tests/units/compiler/ir/test_bridge.py
new file mode 100644
index 00000000000..d58f864d37e
--- /dev/null
+++ b/tests/units/compiler/ir/test_bridge.py
@@ -0,0 +1,114 @@
+"""End-to-end tests for the PyO3 Component reader (pyread).
+
+Build small Reflex pages from real ``Component`` classes, run them through
+``CompilerSession.compile_page_from_component`` (the pyread path — plan
+§0b lever (a)), and assert the rendered JSX contains the expected
+tag/text/props. Originally tested the now-deleted msgpack bridge; the
+asserts are unchanged because pyread is byte-identical on every shape
+this file exercises.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+# Skip the whole module if reflex_base imports fail (e.g., on a minimal
+# environment that doesn't have the components installed).
+pytest.importorskip("reflex_base")
+pytest.importorskip("reflex_components_core")
+pytest.importorskip("reflex_compiler_rust._native")
+
+
+import reflex as rx
+from reflex.compiler.session import CompilerSession
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+def _render(session: CompilerSession, ident: str, route: str, component) -> str:
+ return session.compile_page_from_component(ident, component, route)
+
+
+def test_pyread_text(session: CompilerSession) -> None:
+ """A bare string in a component tree should round-trip as IR Text."""
+ component = rx.text("hello world")
+ js = _render(session, "Index", "/index", component)
+ assert "hello world" in js
+
+
+def test_pyread_box(session: CompilerSession) -> None:
+ """A simple Box wrapping a string."""
+ component = rx.box("inside")
+ js = _render(session, "Box", "/box", component)
+ assert "inside" in js
+ # The emitted JS calls `jsx(<TagName>, …)`.
+ assert "jsx(" in js
+
+
+def test_pyread_nested(session: CompilerSession) -> None:
+ """Nested boxes should produce nested jsx() calls."""
+ component = rx.box(rx.box("inner"))
+ js = _render(session, "Nested", "/nested", component)
+ assert js.count("jsx(") >= 2 # outer + inner
+ assert "inner" in js
+
+
+def test_pyread_multiple_children(session: CompilerSession) -> None:
+ component = rx.box(
+ rx.text("first"),
+ rx.text("second"),
+ rx.text("third"),
+ )
+ js = _render(session, "Multi", "/multi", component)
+ assert "first" in js and "second" in js and "third" in js
+
+
+def test_pyread_var_data_imports_propagate(session: CompilerSession) -> None:
+ """Plain page emit should still include the baseline React-runtime header."""
+ component = rx.box("hello")
+ js = _render(session, "Var", "/var", component)
+ # The basic React-runtime import header is always there.
+ assert 'import { Fragment, useContext, useRef } from "react";' in js
+ # Module export always present (always named "Component" since v2).
+ assert "export default function Component()" in js
+
+
+class _PyReadState(rx.State):
+ logged_in: bool = False
+ items: list[str] = []
+ mode: str = "x"
+
+
+def test_pyread_cond(session: CompilerSession) -> None:
+ component = rx.cond(_PyReadState.logged_in, rx.text("welcome"), rx.text("login"))
+ js = _render(session, "Cond", "/cond", component)
+ # Ternary emit.
+ assert "?" in js and ":" in js
+ assert "welcome" in js and "login" in js
+ # State var should appear in the rendered expression.
+ assert "logged_in" in js
+
+
+def test_pyread_foreach(session: CompilerSession) -> None:
+ component = rx.foreach(_PyReadState.items, lambda item: rx.text(item))
+ js = _render(session, "List", "/list", component)
+ # `.map(...)` per §4.8.
+ assert ".map((" in js
+ # The item arg name (`item` + FIELD_MARKER) should be in the body.
+ assert "item" in js
+
+
+def test_pyread_match(session: CompilerSession) -> None:
+ component = rx.match(
+ _PyReadState.mode,
+ ("a", rx.text("alpha")),
+ ("b", rx.text("beta")),
+ rx.text("other"),
+ )
+ js = _render(session, "M", "/m", component)
+ # Rust emits `match_template(...)` — we wired this in §4.8.
+ assert "match_template(" in js
+ assert "alpha" in js and "beta" in js and "other" in js
diff --git a/tests/units/compiler/ir/test_builder.py b/tests/units/compiler/ir/test_builder.py
new file mode 100644
index 00000000000..9536230fdab
--- /dev/null
+++ b/tests/units/compiler/ir/test_builder.py
@@ -0,0 +1,170 @@
+"""Tests for the Python IR builder and the Rust round-trip.
+
+These are unit tests of :mod:`reflex.compiler.ir.builder`, plus integration
+checks that send the built IR through the Rust ``CompilerSession`` and look
+at the rendered JS source.
+
+The integration checks skip cleanly when the Rust wheel isn't installed so
+contributors without the wheel can still run the unit subset.
+"""
+
+from __future__ import annotations
+
+import re
+
+import pytest
+
+from reflex.compiler.ir import builder as ir
+from reflex.compiler.ir import canonical, pack, schema
+from reflex.compiler.session import CompilerSession
+
+
+def test_text_node_shape() -> None:
+ node = ir.text("hello")
+ assert node[0] == schema.COMPONENT_TEXT
+ assert node[1] == "hello"
+ # The node id was auto-derived from the canonical hash.
+ assert isinstance(node[2], int) and node[2] != 0
+
+
+def test_node_id_is_stable_across_builds() -> None:
+ a = ir.text("hello")
+ b = ir.text("hello")
+ assert a[2] == b[2]
+
+
+def test_node_id_changes_with_content() -> None:
+ a = ir.text("alpha")
+ b = ir.text("beta")
+ assert a[2] != b[2]
+
+
+def test_element_packs_props_and_children() -> None:
+ node = ir.element(
+ "div",
+ props=[("id", ir.js_expr("\"main\""))],
+ children=[ir.text("inner")],
+ )
+ assert node[0] == schema.COMPONENT_ELEMENT
+ assert node[1] == "div"
+ # one prop
+ assert len(node[2]) == 1 and node[2][0][0] == "id"
+ # one child, which is a Text node
+ assert len(node[3]) == 1 and node[3][0][0] == schema.COMPONENT_TEXT
+
+
+def test_page_shape() -> None:
+ page = ir.page(route="/index", root=ir.text("x"))
+ assert page[0] == schema.SCHEMA_VERSION
+ assert page[1] == "/index"
+ assert page[2][0] == schema.COMPONENT_TEXT
+
+
+def test_pack_returns_bytes() -> None:
+ page = ir.page(route="/index", root=ir.text("x"))
+ blob = pack.pack_page(page)
+ assert isinstance(blob, bytes) and len(blob) > 0
+
+
+def test_canonical_hash_is_deterministic() -> None:
+ page_a = ir.page(route="/index", root=ir.text("x"))
+ page_b = ir.page(route="/index", root=ir.text("x"))
+ assert canonical.hash_ir_subtree(page_a) == canonical.hash_ir_subtree(page_b)
+
+
+# ---- Rust round-trip (skip when wheel missing) ------------------------------
+
+pytest.importorskip("reflex_compiler_rust._native")
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+def test_round_trip_emits_text(session: CompilerSession) -> None:
+ page = ir.page(route="/index", root=ir.text("hello"))
+ js = session.compile_page_ir("Index", page)
+ assert "export default function Component()" in js
+ assert 'export const __reflex_route_ident = "Index"' in js
+ assert "\"hello\"" in js
+ assert "export const __reflex_route = \"/index\"" in js
+
+
+def test_round_trip_emits_element(session: CompilerSession) -> None:
+ page = ir.page(
+ route="/about",
+ root=ir.element(
+ "div",
+ props=[("className", ir.js_expr("\"container\""))],
+ children=[ir.text("about page")],
+ ),
+ )
+ js = session.compile_page_ir("About", page)
+ assert "jsx(div, {className: \"container\"}, \"about page\")" in js
+
+
+def test_round_trip_emits_foreach(session: CompilerSession) -> None:
+ page = ir.page(
+ route="/list",
+ root=ir.foreach(
+ ir.js_expr("items"),
+ ir.text("item"),
+ ),
+ )
+ js = session.compile_page_ir("List", page)
+ # Foreach emits `(iter).map((item, index) => body)`.
+ assert "(items).map((item, index) =>" in js
+
+
+def test_round_trip_emits_cond(session: CompilerSession) -> None:
+ page = ir.page(
+ route="/cond",
+ root=ir.cond(
+ ir.js_expr("loggedIn"),
+ ir.text("welcome back"),
+ ir.text("please log in"),
+ ),
+ )
+ js = session.compile_page_ir("Cond", page)
+ assert "loggedIn" in js
+ # Ternary: ((test) ? then : else_)
+ assert "?" in js and ":" in js
+
+
+def test_round_trip_dedups_imports(session: CompilerSession) -> None:
+ page = ir.page(
+ route="/x",
+ root=ir.fragment(
+ [
+ ir.element("div", props=[("x", ir.js_expr("a"))]),
+ ir.element("span", props=[("y", ir.js_expr("b"))]),
+ ]
+ ),
+ # Each Element would push (react, useState); the Rust codegen dedupes
+ # on its way into the import block.
+ component_imports=[("react", "useState"), ("react", "useState")],
+ )
+ js = session.compile_page_ir("X", page)
+ # The Rust codegen merges the harvested ``(react, useState)`` pair onto
+ # the same import line as the baseline ``react`` runtime aliases and
+ # collapses the duplicate, so the page module ends up with one ``react``
+ # import line containing ``useState`` exactly once.
+ react_imports = re.findall(r'^import \{[^}]*\} from "react";', js, re.MULTILINE)
+ assert len(react_imports) == 1, f"expected one react import, got {react_imports!r}\n{js}"
+ assert react_imports[0].count("useState") == 1, (
+ f"useState appears more than once in {react_imports[0]!r}\n{js}"
+ )
+
+
+def test_cache_warm_is_fast(session: CompilerSession) -> None:
+ """Warm-cache hit reads the Arc without re-parsing or re-emitting."""
+ page = ir.page(route="/perf", root=ir.text("hi"))
+ blob = pack.pack_page(page)
+ session.clear_cache()
+ assert session.cache_len() == 0
+ session.compile_page_bytes("Perf", blob)
+ assert session.cache_len() == 1
+ # Compiling again should not bump the cache.
+ session.compile_page_bytes("Perf", blob)
+ assert session.cache_len() == 1
diff --git a/tests/units/compiler/ir/test_compile_app.py b/tests/units/compiler/ir/test_compile_app.py
new file mode 100644
index 00000000000..04b7e9979d7
--- /dev/null
+++ b/tests/units/compiler/ir/test_compile_app.py
@@ -0,0 +1,101 @@
+"""End-to-end test for ``CompilerSession.compile_app_ir`` covering D10/D11.
+
+Builds a multi-page IR app plus theme, global state, and plugin manifest,
+sends it all to the Rust compiler, and asserts the right output files come
+back.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+pytest.importorskip("reflex_compiler_rust._native")
+
+from reflex.compiler.ir import builder as ir
+from reflex.compiler.ir import schema # noqa: F401 (sanity import)
+from reflex.compiler.session import CompilerSession
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+def _theme_ir() -> list:
+ return [
+ schema.SCHEMA_VERSION,
+ [["accentColor", "#ff0080"], ["radiusMd", "8px"]],
+ "body { margin: 0; }",
+ "light",
+ ]
+
+
+def _global_state_ir() -> list:
+ return [
+ schema.SCHEMA_VERSION,
+ b"{\"count\": 0}",
+ b"{}",
+ [],
+ ]
+
+
+def _plugin_manifest_ir() -> list:
+ return [
+ schema.SCHEMA_VERSION,
+ [
+ ["radix", [], ["@radix-ui/themes/styles.css"]],
+ ],
+ ]
+
+
+def test_compile_app_emits_all_artifacts(session: CompilerSession) -> None:
+ pages = [
+ ("Index", "/", ir.page(route="/", root=ir.text("home"))),
+ ("About", "/about", ir.page(route="/about", root=ir.text("about"))),
+ ("Docs", "/docs", ir.page(route="/docs", root=ir.text("docs"))),
+ ]
+ out = session.compile_app_ir(
+ pages,
+ theme=_theme_ir(),
+ global_state=_global_state_ir(),
+ plugin_manifest=_plugin_manifest_ir(),
+ )
+ files = out.files() # type: ignore[attr-defined]
+ paths = sorted(files.keys())
+
+ # Per-page modules.
+ assert "pages/index.jsx" in paths
+ assert "pages/about.jsx" in paths
+ assert "pages/docs.jsx" in paths
+
+ # Theme CSS.
+ assert "src/styles/theme.css" in paths
+ assert b"--accent-color: #ff0080;" in files["src/styles/theme.css"]
+
+ # Context shell.
+ assert "src/context.js" in paths
+ assert b"initialState = {\"count\": 0}" in files["src/context.js"]
+
+ # AppWrap with the plugin stylesheet pulled in.
+ assert "src/AppWrap.jsx" in paths
+ assert b"@radix-ui/themes/styles.css" in files["src/AppWrap.jsx"]
+
+ # Vite config.
+ assert "vite.config.js" in paths
+ assert b"defineConfig" in files["vite.config.js"]
+
+
+def test_compile_app_parallel_caches_across_pages(session: CompilerSession) -> None:
+ """rayon over pages must still hit the content-hash cache on repeat runs."""
+ session.clear_cache()
+ pages = [
+ ("A", "/a", ir.page(route="/a", root=ir.text("aaa"))),
+ ("B", "/b", ir.page(route="/b", root=ir.text("bbb"))),
+ ("C", "/c", ir.page(route="/c", root=ir.text("ccc"))),
+ ]
+ _ = session.compile_app_ir(pages)
+ assert session.cache_len() == 3
+
+ # Compile again — every page is a cache hit.
+ _ = session.compile_app_ir(pages)
+ assert session.cache_len() == 3
diff --git a/tests/units/compiler/ir/test_sourcemap.py b/tests/units/compiler/ir/test_sourcemap.py
new file mode 100644
index 00000000000..1939780b963
--- /dev/null
+++ b/tests/units/compiler/ir/test_sourcemap.py
@@ -0,0 +1,51 @@
+"""Tests for the source-map round-trip through CompilerSession."""
+
+from __future__ import annotations
+
+import pytest
+
+pytest.importorskip("reflex_compiler_rust._native")
+
+from reflex.compiler.ir import builder as ir
+from reflex.compiler.session import CompilerSession
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+def test_synthetic_locs_produce_empty_map(session: CompilerSession) -> None:
+ page = ir.page(route="/x", root=ir.text("hello"))
+ js, mappings = session.compile_page_with_sourcemap("X", page)
+ assert "hello" in js
+ assert mappings == []
+
+
+def test_real_loc_recorded(session: CompilerSession) -> None:
+ text = ir.text("hi", loc=ir.source_loc(file_id=7, line=42, col=11))
+ page = ir.page(route="/x", root=text)
+ js, mappings = session.compile_page_with_sourcemap("X", page)
+ assert "hi" in js
+ assert len(mappings) >= 1
+ offset, file_id, line, col = mappings[0]
+ assert file_id == 7
+ assert line == 42
+ assert col == 11
+ # The recorded offset should land on or just before the JS string literal.
+ rendered_text_pos = js.index('"hi"')
+ assert offset <= rendered_text_pos
+
+
+def test_nested_components_record_multiple_locs(session: CompilerSession) -> None:
+ inner = ir.text("inner", loc=ir.source_loc(file_id=1, line=10, col=1))
+ outer = ir.element(
+ "div",
+ children=[inner],
+ loc=ir.source_loc(file_id=1, line=5, col=1),
+ )
+ page = ir.page(route="/x", root=outer)
+ js, mappings = session.compile_page_with_sourcemap("X", page)
+ # Two distinct source lines should produce at least two entries.
+ lines = {line for _, _, line, _ in mappings}
+ assert {5, 10}.issubset(lines)
diff --git a/tests/units/compiler/test_markdown.py b/tests/units/compiler/test_markdown.py
new file mode 100644
index 00000000000..a4cbdd03c9d
--- /dev/null
+++ b/tests/units/compiler/test_markdown.py
@@ -0,0 +1,49 @@
+"""Tests for the Rust-accelerated Markdown wrapper."""
+
+from __future__ import annotations
+
+import pytest
+
+from reflex.compiler import markdown
+
+
+def test_basic_rendering() -> None:
+ out = markdown.markdown_to_html("# Hello\n\nworld")
+ assert "<h1>Hello</h1>" in out
+ assert "<p>world</p>" in out
+
+
+def test_tables_supported() -> None:
+ """Rust wheel ships with tables enabled by default. mistletoe also does."""
+ out = markdown.markdown_to_html("| a | b |\n|---|---|\n| 1 | 2 |")
+ assert "<table>" in out
+ assert "<td>1</td>" in out
+
+
+def test_strikethrough_supported() -> None:
+ out = markdown.markdown_to_html("a ~~b~~ c")
+ assert "<del>b</del>" in out or "<s>b</s>" in out
+
+
+def test_rust_backend_when_available() -> None:
+ """When the wheel is installed, the auto backend should choose Rust."""
+ try:
+ from reflex_markdown_rust import markdown_to_html as _rust # noqa: F401
+ except ImportError:
+ pytest.skip("reflex_markdown_rust wheel not installed")
+ # Trigger the lazy resolution.
+ markdown.markdown_to_html("")
+ assert markdown.is_rust()
+
+
+def test_explicit_python_backend_when_mistletoe_present(monkeypatch) -> None:
+ try:
+ import mistletoe # noqa: F401
+ except ImportError:
+ pytest.skip("mistletoe not installed")
+ monkeypatch.setenv("REFLEX_MARKDOWN", "python")
+ # Reset the cached implementation.
+ monkeypatch.setattr(markdown, "_impl", None)
+ out = markdown.markdown_to_html("# X")
+ assert "<h1>X</h1>" in out
+ assert not markdown.is_rust()
diff --git a/tests/units/compiler/test_memo_module_emit.py b/tests/units/compiler/test_memo_module_emit.py
new file mode 100644
index 00000000000..ac356051156
--- /dev/null
+++ b/tests/units/compiler/test_memo_module_emit.py
@@ -0,0 +1,90 @@
+"""Smoke tests for `CompilerSession.compile_memo_from_component`.
+
+Phase 3 of the memoize port (plan §0b lever (b3)) is the
+``memo_single_component_template`` replacement: pyread walks a wrapper
+Component and `emit_memo_module` produces the
+``export const <name> = memo(...)`` shell.
+
+The tests here exercise the public entry point against a few real
+wrapper shapes built via the legacy
+``create_passthrough_component_memo``. They assert structural properties
+of the rust output — exported name, ``memo(({ children })`` shell, the
+``children`` placeholder reaching the call site, and the right imports.
+Byte-equality against the legacy template isn't enforced because the
+templates differ in whitespace.
+"""
+
+from __future__ import annotations
+
+import copy
+
+import pytest
+
+pytest.importorskip("reflex_base")
+pytest.importorskip("reflex_components_core")
+pytest.importorskip("reflex_compiler_rust._native")
+
+import reflex as rx
+from reflex.compiler.session import CompilerSession
+from reflex.experimental.memo import create_passthrough_component_memo
+
+
+class _MemoState(rx.State):
+ n: int = 0
+ items: list[str] = []
+
+ @rx.event
+ def bump(self) -> None:
+ self.n += 1
+
+
+def _build_body(component):
+ """Return the memo body Component with the `{children}` hole substituted in."""
+ _, defn = create_passthrough_component_memo(component)
+ body = copy.copy(defn.component)
+ if defn.passthrough_hole_child is not None:
+ body.children = [defn.passthrough_hole_child]
+ return defn, body
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+def test_memo_button_with_event_handler(session: CompilerSession) -> None:
+ """A button with an event handler memos into a `memo(({ children }))` module."""
+ defn, body = _build_body(rx.button("click", on_click=_MemoState.bump))
+ js = session.compile_memo_from_component(
+ defn.export_name, "({ children })", body
+ )
+ assert f"export const {defn.export_name} = memo(({{ children }})" in js
+ assert "addEvents" in js # event handler hook used inside memo body
+ assert 'import { memo, useContext, useRef } from "react";' in js
+ assert "RadixThemesButton" in js
+ # the placeholder reaches the JSX call site as a free `children` identifier
+ assert ", children)" in js
+
+
+def test_memo_box_with_state_child(session: CompilerSession) -> None:
+ """A box wrapping a state-bearing child memos with `children` placeholder.
+
+ The state-referring text gets substituted into the `{children}` hole at
+ wrapper-build time, so the memo body renders `<Box>{children}</Box>` and
+ holds no direct StateContexts binding — the state binding lives on the
+ page-level call site, not inside the memo.
+ """
+ defn, body = _build_body(rx.box(rx.text(_MemoState.n.to(str))))
+ js = session.compile_memo_from_component(defn.export_name, "({ children })", body)
+ assert defn.export_name in js
+ assert "memo(" in js
+ assert "RadixThemesBox" in js
+ assert ", children)" in js
+
+
+def test_memo_snapshot_signature(session: CompilerSession) -> None:
+ """Snapshot memos use `()` signature, not `({ children })`."""
+ defn, body = _build_body(rx.text("static"))
+ js = session.compile_memo_from_component(defn.export_name, "()", body)
+ assert "memo(()" in js
+ assert "({ children })" not in js
diff --git a/tests/units/compiler/test_rust_pipeline.py b/tests/units/compiler/test_rust_pipeline.py
new file mode 100644
index 00000000000..b57707170d5
--- /dev/null
+++ b/tests/units/compiler/test_rust_pipeline.py
@@ -0,0 +1,233 @@
+"""Tests for the run-rust pipeline.
+
+The tests here cover the public surface in
+:mod:`reflex.compiler.rust_pipeline`:
+
+* :func:`scaffold_exists` — discriminates a ready ``.web/`` from an empty
+ one.
+* :func:`compile_pages` — emits JSX for every registered page directly
+ through the Rust pipeline.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+pytest.importorskip("reflex_base")
+pytest.importorskip("reflex_components_core")
+pytest.importorskip("reflex_compiler_rust._native")
+
+
+import reflex as rx
+from reflex.compiler import rust_pipeline
+from reflex.compiler.session import CompilerSession
+
+
+@pytest.fixture(scope="module")
+def session() -> CompilerSession:
+ return CompilerSession()
+
+
+def test_scaffold_exists_true_when_all_present(tmp_path: Path) -> None:
+ web = tmp_path / ".web"
+ web.mkdir()
+ (web / "package.json").write_text("{}")
+ (web / "vite.config.js").write_text("// vite")
+ (web / "reflex.json").write_text("{}")
+ (web / "app").mkdir()
+ (web / "utils").mkdir()
+
+ assert rust_pipeline.scaffold_exists(web)
+
+
+def test_scaffold_exists_false_when_file_missing(tmp_path: Path) -> None:
+ web = tmp_path / ".web"
+ web.mkdir()
+ (web / "package.json").write_text("{}")
+ (web / "vite.config.js").write_text("// vite")
+ # reflex.json missing
+ (web / "app").mkdir()
+ (web / "utils").mkdir()
+
+ assert not rust_pipeline.scaffold_exists(web)
+
+
+def test_scaffold_exists_false_when_dir_missing(tmp_path: Path) -> None:
+ web = tmp_path / ".web"
+ web.mkdir()
+ (web / "package.json").write_text("{}")
+ (web / "vite.config.js").write_text("// vite")
+ (web / "reflex.json").write_text("{}")
+ # utils dir missing
+ (web / "app").mkdir()
+
+ assert not rust_pipeline.scaffold_exists(web)
+
+
+def test_scaffold_exists_false_when_no_web(tmp_path: Path) -> None:
+ assert not rust_pipeline.scaffold_exists(tmp_path / ".web")
+
+
+def test_compile_pages_emits_pages(
+ tmp_path: Path,
+ session: CompilerSession,
+ monkeypatch: pytest.MonkeyPatch,
+) -> None:
+ """``compile_pages`` emits one JSX file per registered page, never touching App._compile."""
+ from reflex.utils import prerequisites
+
+ web = tmp_path / ".web"
+ web.mkdir()
+ monkeypatch.setattr(prerequisites, "get_web_dir", lambda: web)
+
+ app = rx.App()
+
+ def index() -> rx.Component:
+ return rx.box("hello rust")
+
+ def about() -> rx.Component:
+ return rx.text("about page")
+
+ app.add_page(index, route="/")
+ app.add_page(about, route="/about")
+
+ # Sanity: App._pages must be empty — the Rust pipeline reads unevaluated only.
+ assert not getattr(app, "_pages", {})
+
+ written, all_imports = rust_pipeline.compile_pages(app, session=session)
+
+ # ``add_page`` normalizes routes via ``format.format_route`` (strips
+ # leading "/", maps "/" → "index"), so the output mirrors what the
+ # registry stores. Plus the pipeline auto-adds the 404 slug if the
+ # app didn't register one (matching ``App._compile``'s behaviour), so
+ # the resulting set is the user's pages plus ``Page404.SLUG``.
+ assert set(written.keys()) >= {"index", "about"}
+ assert len(written) == 3
+ for path in written.values():
+ assert path.exists()
+ contents = path.read_text()
+ assert "jsx(" in contents
+ assert "Component" in contents # default export name
+
+ # Body content survived through the Rust emit.
+ all_text = "\n".join(p.read_text() for p in written.values())
+ assert "hello rust" in all_text
+ assert "about page" in all_text
+
+ # Imports from at least one page should have been harvested for the
+ # later ``bun install`` step.
+ assert isinstance(all_imports, dict)
+
+ # The Rust pipeline did NOT populate ``_pages`` (no legacy compile ran).
+ assert not getattr(app, "_pages", {})
+
+
+def test_compile_pages_routes_filter(
+ tmp_path: Path,
+ session: CompilerSession,
+ monkeypatch: pytest.MonkeyPatch,
+) -> None:
+ from reflex.utils import prerequisites
+
+ web = tmp_path / ".web"
+ web.mkdir()
+ monkeypatch.setattr(prerequisites, "get_web_dir", lambda: web)
+
+ app = rx.App()
+ app.add_page(lambda: rx.text("a"), route="/a")
+ app.add_page(lambda: rx.text("b"), route="/b")
+
+ # Routes get normalized to "a", "b" inside ``add_page``; pass the
+ # normalized form to ``routes=`` since that's what the pipeline keys on.
+ written, _ = rust_pipeline.compile_pages(app, session=session, routes=["a"])
+ assert set(written.keys()) == {"a"}
+
+
+def _normalize_imports(d: dict) -> dict[str, list]:
+ """Drop the ``defaultdict`` wrapping + sort entries by ``str()``.
+
+ The order in which ``_get_all_imports`` and the Rust walker emit
+ items can differ (HashMap vs ordered Python dict), so parity needs a
+ canonical form. ``ImportVar`` is hashable but its repr is the most
+ portable thing to sort by.
+
+ Args:
+ d: A ``ParsedImportDict``-shaped mapping.
+
+ Returns:
+ A plain ``dict`` with each library's items sorted by ``str()``.
+ """
+ return {lib: sorted(items, key=str) for lib, items in d.items()}
+
+
+def _sample_component() -> rx.Component:
+ """A tree that exercises every surface ``_get_all_imports`` walks.
+
+ Returns:
+ A Component covering library/tag imports, event-trigger imports,
+ nested children, and the ``_get_components_in_props`` recursion
+ (via ``rx.cond`` carrying Components in its props).
+ """
+ state_var = rx.Var(_js_expr="someState", _var_type=str)
+ return rx.box(
+ rx.text("hello"),
+ rx.heading("title"),
+ rx.cond(
+ state_var,
+ rx.button("click", on_click=lambda: rx.console_log("c")),
+ rx.text("fallback"),
+ ),
+ )
+
+
+def test_collect_all_imports_matches_python(session: CompilerSession) -> None:
+ """The Rust ``collect_all_imports`` mirrors Python ``_get_all_imports``."""
+ component = _sample_component()
+ py_imports = component._get_all_imports()
+ rust_imports = session.collect_all_imports(component)
+
+ assert _normalize_imports(dict(rust_imports)) == _normalize_imports(
+ dict(py_imports)
+ )
+
+
+def test_collect_all_imports_into_matches_python_merge_imports(
+ session: CompilerSession,
+) -> None:
+ """``collect_all_imports_into`` matches ``merge_imports(target, _get_all_imports())``.
+
+ The in-place variant applies the same ``$/utils/...`` prefix
+ transform that the Python ``merge_imports`` wrapper does, so the
+ final dict must match what the legacy two-step
+ ``merge_imports(target, component._get_all_imports())`` would
+ produce.
+ """
+ from reflex.compiler import utils as compiler_utils
+
+ component = _sample_component()
+
+ py_target: dict[str, list] = {}
+ py_target = compiler_utils.merge_imports(py_target, component._get_all_imports())
+
+ rust_target: dict[str, list] = {}
+ session.collect_all_imports_into(rust_target, component)
+
+ assert _normalize_imports(dict(rust_target)) == _normalize_imports(dict(py_target))
+
+
+def test_merge_imports_into_applies_alias_prefix(session: CompilerSession) -> None:
+ """``merge_imports_into`` rewrites ``/utils/...`` -> ``$/utils/...``."""
+ from reflex_base.utils.imports import ImportVar
+
+ target: dict[str, list] = {"react": [ImportVar(tag="useState")]}
+ source = {
+ "/utils/state": [ImportVar(tag="StateContexts")],
+ "react": [ImportVar(tag="useEffect")],
+ }
+ session.merge_imports_into(target, source)
+
+ assert "$/utils/state" in target
+ assert "/utils/state" not in target
+ assert len(target["react"]) == 2
diff --git a/uv.lock b/uv.lock
index f3122ca7c5b..1b33e13b108 100644
--- a/uv.lock
+++ b/uv.lock
@@ -16,6 +16,7 @@ members = [
"hatch-reflex-pyi",
"reflex",
"reflex-base",
+ "reflex-compiler-rust",
"reflex-components-code",
"reflex-components-core",
"reflex-components-dataeditor",
@@ -34,6 +35,7 @@ members = [
"reflex-docs-bundle",
"reflex-hosting-cli",
"reflex-integrations-docs",
+ "reflex-markdown-rust",
"reflex-site-shared",
]
@@ -1864,6 +1866,67 @@ wheels = [
{ url = "https://files.pythonhosted.org/packages/20/60/0980fefdc4d12c18c1bbab9d62852f27aded8839233c7b0a9827aaf395f5/mistletoe-1.5.1-py3-none-any.whl", hash = "sha256:d3e97664798261503f685f6a6281b092628367cf3128fc68a015a993b0c4feb3", size = 55331, upload-time = "2025-12-07T16:18:59.65Z" },
]
+[[package]]
+name = "msgpack"
+version = "1.1.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/4d/f2/bfb55a6236ed8725a96b0aa3acbd0ec17588e6a2c3b62a93eb513ed8783f/msgpack-1.1.2.tar.gz", hash = "sha256:3b60763c1373dd60f398488069bcdc703cd08a711477b5d480eecc9f9626f47e", size = 173581, upload-time = "2025-10-08T09:15:56.596Z" }
+wheels = [
+ { url = "https://files.pythonhosted.org/packages/f5/a2/3b68a9e769db68668b25c6108444a35f9bd163bb848c0650d516761a59c0/msgpack-1.1.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:0051fffef5a37ca2cd16978ae4f0aef92f164df86823871b5162812bebecd8e2", size = 81318, upload-time = "2025-10-08T09:14:38.722Z" },
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version = "6.7.1"
@@ -3564,6 +3627,20 @@ requires-dist = [
{ name = "typing-extensions", specifier = ">=4.13.0" },
]
+[[package]]
+name = "reflex-compiler-rust"
+version = "0.0.0"
+source = { editable = "packages/reflex-compiler-rust" }
+
+[package.optional-dependencies]
+bench = [
+ { name = "msgpack" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "msgpack", marker = "extra == 'bench'", specifier = ">=1.0.7" }]
+provides-extras = ["bench"]
+
[[package]]
name = "reflex-components-code"
source = { editable = "packages/reflex-components-code" }
@@ -3883,6 +3960,11 @@ requires-dist = [
name = "reflex-integrations-docs"
source = { editable = "packages/integrations-docs" }
+[[package]]
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+version = "0.0.0"
+source = { editable = "packages/reflex-markdown-rust" }
+
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name = "reflex-pyplot"
version = "0.2.1"