fix: fix jiti usage for tsconfig paths

[schiller-manuel]

closes #7275

Summary by CodeRabbit

• New Features

  • Virtual route config loading now honors TypeScript tsconfig path aliases, improving import resolution for route modules.

• Tests

  • Added test fixtures and automated checks covering virtual route configurations with tsconfig path alias support.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Run ID: ce00b901-0b1d-4d6c-949a-b8f51bcde99a

📥 Commits

Reviewing files that changed from the base of the PR and between 0c618ce and b0dd8c5.

📒 Files selected for processing (1)

• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes.ts

✅ Files skipped from review due to trivial changes (1)

• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes.ts

---

📝 Walkthrough

Walkthrough

Router generator now enables TypeScript tsconfig path alias resolution when loading virtual route configuration files. The core change adds tsconfigPaths: true to Jiti options. A test suite validates the feature with an aliased subtree and nested route hierarchy using a @/* alias.

Changes

TypeScript tsconfig Path Resolution

Layer / File(s)	Summary
Jiti Configuration packages/router-generator/src/filesystem/virtual/loadConfigFile.ts	loadConfigFile instantiates Jiti with tsconfigPaths: true and interopDefault: false to resolve TypeScript path aliases.
Test Configuration packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/tsconfig.json, packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/tsr.config.json	Fixture tsconfig defines @/* → ./aliased/*; tsr.config.json points the generator at the test routes directory, generated output, and virtual config module.
Aliased Virtual Routes packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/aliased/virtual-routes.ts	New module exported via the @/* alias providing helloSubtree as a physical route.
Route File Hierarchy packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/*, .../db/*, .../subtree/*	Multiple file-route definitions added: root, index, layout, pages (/$lang/), dashboard, invoices, invoice detail, and nested subtree routes used by the test.
Route Tree Orchestration packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes.ts	Composes file routes and the aliased helloSubtree into the exported route tree with proper nesting.
Generated Route Tree packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routeTree.snapshot.ts	Snapshot of expected generator output: route constants with id/path/getParentRoute, typed route mapping interfaces, and module augmentation for TanStack React Router.
Release Notes .changeset/quiet-rivers-serve.md	Changeset documents a patch release for @tanstack/router-generator enabling tsconfig path alias resolution.

🎯 2 (Simple) | ⏱️ ~12 minutes

🐰 With aliases now resolved, our config files dance free,

Path mappings spring to life in harmony,
No more module-not-found to make us weep,
The router's routes run nested and deep! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'fix: fix jiti usage for tsconfig paths' clearly and specifically summarizes the main change - fixing jiti configuration to properly handle TypeScript path aliases in tsconfig.
Linked Issues check	✅ Passed	The PR addresses issue #7275 by enabling TypeScript path alias resolution in the Jiti loader. Changes to loadConfigFile.ts add 'tsconfigPaths: true' configuration, directly fixing the reported 'Cannot find module' error when importing with path aliases.
Out of Scope Changes check	✅ Passed	All changes are in-scope: the core fix modifies loadConfigFile.ts to support tsconfig paths, and new test files comprehensively validate the fix with path aliases configured in tsconfig.json.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch copilot/fix-jiti-usage

---

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View your CI Pipeline Execution ↗ for commit 0c618ce

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---

☁️ Nx Cloud last updated this comment at 2026-05-11 19:03:17 UTC

[github-actions]

🚀 Changeset Version Preview

6 package(s) bumped directly, 18 bumped as dependents.

🟨 Minor bumps

Package	Version	Reason
@tanstack/start-client-core	1.168.2 → 1.169.0	Changeset

🟩 Patch bumps

Package	Version	Reason
@tanstack/router-core	1.169.2 → 1.169.3	Changeset
@tanstack/router-generator	1.166.42 → 1.166.43	Changeset
@tanstack/start-fn-stubs	1.161.6 → 1.161.7	Changeset
@tanstack/start-plugin-core	1.169.20 → 1.169.21	Changeset
@tanstack/start-server-core	1.167.30 → 1.167.31	Changeset
@tanstack/react-router	1.169.2 → 1.169.3	Dependent
@tanstack/react-start	1.167.65 → 1.167.66	Dependent
@tanstack/react-start-client	1.166.48 → 1.166.49	Dependent
@tanstack/react-start-rsc	0.0.44 → 0.0.45	Dependent
@tanstack/react-start-server	1.166.52 → 1.166.53	Dependent
@tanstack/router-cli	1.166.43 → 1.166.44	Dependent
@tanstack/router-plugin	1.167.35 → 1.167.36	Dependent
@tanstack/router-vite-plugin	1.166.50 → 1.166.51	Dependent
@tanstack/solid-router	1.169.2 → 1.169.3	Dependent
@tanstack/solid-start	1.167.62 → 1.167.63	Dependent
@tanstack/solid-start-client	1.166.47 → 1.166.48	Dependent
@tanstack/solid-start-server	1.166.51 → 1.166.52	Dependent
@tanstack/start-static-server-functions	1.166.41 → 1.166.42	Dependent
@tanstack/start-storage-context	1.166.35 → 1.166.36	Dependent
@tanstack/vue-router	1.169.2 → 1.169.3	Dependent
@tanstack/vue-start	1.167.58 → 1.167.59	Dependent
@tanstack/vue-start-client	1.166.43 → 1.166.44	Dependent
@tanstack/vue-start-server	1.166.47 → 1.166.48	Dependent

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commit: b0dd8c5

[github-actions]

Bundle Size Benchmarks

• Commit: b1c061aff918
• Measured at: 2026-05-11T19:01:05.994Z
• Baseline source: history:b1c061aff918
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Initial gzip	Raw	Brotli	Trend
react-router.minimal	87.29 KiB	0 B (0.00%)	87.15 KiB	274.07 KiB	75.85 KiB	▁▁▁▁▁▁▁▁▁██
react-router.full	90.82 KiB	0 B (0.00%)	90.68 KiB	285.58 KiB	78.89 KiB	▁▁▁▁▁▁▁▁▁██
solid-router.minimal	35.51 KiB	0 B (0.00%)	35.39 KiB	106.36 KiB	31.97 KiB	▁▁▁▁▁▁▁▁▁██
solid-router.full	40.23 KiB	0 B (0.00%)	40.10 KiB	120.58 KiB	36.14 KiB	▁▁▁▁▁▁▁▁▁██
vue-router.minimal	53.29 KiB	0 B (0.00%)	53.15 KiB	151.51 KiB	47.85 KiB	▁▁▁▁▁▁▁▁▁██
vue-router.full	58.41 KiB	0 B (0.00%)	58.28 KiB	167.69 KiB	52.39 KiB	▁▁▁▁▁▁▁▁▁██
react-start.minimal	101.97 KiB	0 B (0.00%)	101.83 KiB	322.51 KiB	88.17 KiB	▁▁▁▁▁▁▁▁▃██
react-start.full	105.41 KiB	0 B (0.00%)	105.27 KiB	332.84 KiB	91.19 KiB	▁▁▁▁▁▁▁▁▄██
react-start.rsbuild.minimal	99.60 KiB	0 B (0.00%)	99.43 KiB	316.97 KiB	85.64 KiB	▁▁▁▁▁▁▁▁▄██
react-start.rsbuild.full	102.89 KiB	0 B (0.00%)	102.72 KiB	327.41 KiB	88.45 KiB	▁▁▁▁▁▁▁▁▃██
solid-start.minimal	49.61 KiB	0 B (0.00%)	49.48 KiB	152.48 KiB	43.78 KiB	▁▁▁▁▁▁▁▁▄██
solid-start.full	55.40 KiB	0 B (0.00%)	55.27 KiB	169.39 KiB	48.72 KiB	▁▁▁▁▁▁▁▁▄██

Current gzip tracks all emitted client JS chunks. Initial gzip tracks only the entry/import graph. Trend sparkline is historical current gzip ending with this PR measurement; lower is better.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In
`@packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes.ts`:
- Line 1: Remove the top-line "// `@ts-nocheck`" from the TypeScript fixture so
the file is fully type-checked; then fix any resulting type errors in this file
(check imports from "@tanstack/virtual-file-routes" and usages of tsconfig path
aliases) by adding proper type annotations or correcting import paths/usages so
the file compiles under the repo's strict TypeScript settings and passes the
repo typecheck.

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---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3d691dfe-5521-46c8-8a9a-b16bea9368a6

📥 Commits

Reviewing files that changed from the base of the PR and between b1c061a and 0c618ce.

📒 Files selected for processing (19)

• .changeset/quiet-rivers-serve.md
• packages/router-generator/src/filesystem/virtual/loadConfigFile.ts
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/aliased/virtual-routes.ts
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routeTree.snapshot.ts
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes.ts
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/db/dashboard-index.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/db/dashboard-invoices.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/db/dashboard.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/db/invoice-detail.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/db/invoices-index.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/index.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/layout.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/pages.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/root.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/subtree/foo/$id.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/subtree/foo/index.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/routes/subtree/index.tsx
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/tsconfig.json
• packages/router-generator/tests/generator/virtual-config-file-tsconfig-paths/tsr.config.json

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[codspeed-hq]

Merging this PR will not alter performance

✅ 5 untouched benchmarks
⏩ 1 skipped benchmark¹

---

_{Comparing copilot/fix-jiti-usage (b0dd8c5) with main (b1c061a)}

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩