feat(wasm): bundler build() minimal export + JS bridge round-trip 검증 (#1885 Phase 2 PR 6-2c-1)#1941
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…1885 PR 6-2c-1) Phase 2 핵심 — JS host ↔ WASM bundler 의 zts_fs callback round-trip 동작 검증. 실제 bundler.bundle() 호출은 PR 6-2c-2. 변경: - packages/wasm/src/wasm_bundler_entry.zig: * c_allocator (wasi-musl malloc, thread-safe) — Zig 0.15 wasm_allocator 가 multi-threaded 미지원 * main() stub — wasi-musl libc 가 main 심볼 강제 * alloc/dealloc export — JS 측 메모리 관리 * build(entry_path_ptr, len) export — fs.readFile 통과 echo (zts_fs 통과) - build.zig: wasm-bundler 에 linkLibC 추가 - packages/wasm/index.ts: * createWasiImports 확장 — wasi-musl 의존 fn 풀 stub (args/environ/proc_exit/ fd_*/path_*/sched_yield/poll_oneoff) * BundlerExports 갱신 (build/alloc/dealloc), bundlerMemory 별도 보관 (import_memory 라 instance.exports.memory undefined) * initBundler 가 SharedArrayBuffer 기반 WebAssembly.Memory 생성 + env.memory import * build() API — entry path → packed result decode - packages/wasm/index.test.ts: 통합 테스트 4개 (bundlerVersion/build/null) 검증: - zts-bundler.wasm = 5.5 KB - bun test 38 통과 (transpile 29 + VFS 5 + Bundler 4) - JS bridge round-trip: VFS.set → build("/foo.ts") → zts_fs.readFile callback → wasm → packed result → JS decode 다음: - PR 6-2c-2: wasm_bundler_entry build() 가 bundler.Bundler.init + bundle() 진짜 호출 - 호환성 검증 — Thread.Pool, fs.zig 의존, 기타 bundler 코드 wasm-musl link Refs #1885 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Bundler (minimal) test 가 zig-out/bin/zts-bundler.wasm 의존 — CI workflow 가 wasm-bundler 빌드 안 해서 ENOENT. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
/simplify 검토 — wasi-musl libc 의 fd_prestat_get / path_* 가 0 (success) 반환 시 gibberish 메모리 read 시도 → panic. EBADF 가 안전한 fallback. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Smoke Test Results (CI)Smoke Test Results
Size Comparison (ZTS vs esbuild)
Average ratio: 0.82x | Smaller: 131 | Similar(±10%): 1 | Larger: 4
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Summary
Phase 2 핵심 — JS host ↔ WASM bundler 의 `zts_fs` callback round-trip 동작 검증. 실제 `bundler.bundle()` 호출은 PR 6-2c-2.
핵심 검증:
```
VFS.set("/foo.ts", "...")
→ build("/foo.ts")
→ wasm bundler_entry.build()
→ fs.readFile (Zig)
→ zts_fs.readFile callback (JS)
→ VFS.get → packed result
→ wasm → JS decode
→ { code: "..." }
```
변경
`packages/wasm/src/wasm_bundler_entry.zig`
`build.zig`
`packages/wasm/index.ts`
`packages/wasm/index.test.ts`
검증
디자인 노트
wasi-musl 의존 이유: Zig 0.15 의 `wasm_allocator` (page_allocator 도 동일) 가 multi-threaded wasm 미지원. `wasm32-wasi-musl` + `linkLibC` 로 thread-safe `malloc` 사용.
WASI shim: bundler 가 wasi-musl libc 의존 → wasi_snapshot_preview1 의 다수 fn 호출. JS 측 stub (대부분 `return 0`) 으로 link 통과. bundler 가 실제 OS 의존 호출 안 한다는 가정.
SharedArrayBuffer: `shared_memory=true` + `import_memory=true` → JS 측이 `WebAssembly.Memory({ shared: true })` 생성, `env.memory` 로 import.
다음 단계
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