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test(vitest): run pool workers with the WASM runtime flags (#1779) - #2046
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A vitest pool worker is the one launch path that never received `--liftoff-only`, so the suite compiled tree-sitter grammars on the turboshaft tier. Once ~640 extraction tests have warmed a grammar function up, its background tier-up job (Turboshaft LoopUnrollingPhase, symbolized from the native stack) exhausts a compiler Zone and aborts the worker: `Fatal process out of memory: Zone`, which vitest reports only as "Worker exited unexpectedly" with the file's remaining tests unrun. Pass WASM_RUNTIME_FLAGS through poolOptions.forks.execArgv, so the test process matches the bundled launcher, the CLI re-exec and refresh-launcher. V8 flags are process-global, so parse worker threads are covered too. Linux x64, Node 24.15, `__tests__/extraction.test.ts` (655 tests): without the flag 3 of 4 runs died at the same test (639 passed); with it 2 of 2 passed, in 19–24s instead of 34–41s. Neither `--no-wasm-loop-unrolling` nor `--no-wasm-dynamic-tiering` prevents it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> (cherry picked from commit 565ec81)
This was referenced Sep 27, 2026
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Carries @danusha2345's #1883 onto current
main(their commits, authorship preserved; the CHANGELOG entry is collected separately to avoid conflicts between the fix PRs).Validation
mainand passes on this branch.npx tsc --noEmitis clean.Fixes #1779
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