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perf(@angular/build): avoid web worker channel overhead in library parallel compilation - #34422
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alan-agius4 merged 2 commits intoOct 22, 2026
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This pull request optimizes parallel compilation by making the web worker channel optional, which avoids setting it up for library builds. It also replaces UUID generation with an incrementing numeric ID for stylesheet transformation requests to improve performance, and adds a new test suite to verify these changes. There are no review comments, so I have no feedback to provide.
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…rallel compilation Skip creating and transferring `webWorkerChannel` (`MessageChannel`) and `webWorkerSignal` (`SharedArrayBuffer`) in `ParallelCompilation.initialize()` when `buildType === 'library'`, as library builds do not bundle web workers via `processWebWorker` and previously left ports open until the next build if `emitAffectedFiles()` was skipped due to stylesheet errors. Also replace `crypto.randomUUID()` per component stylesheet request in `parallel-worker.ts` with an incrementing numeric request counter.
…rary parallel compilation
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Skip creating and transferring
webWorkerChannel(MessageChannel) andwebWorkerSignal(SharedArrayBuffer) inParallelCompilation.initialize()whenbuildType === 'library', as library builds do not bundle web workers viaprocessWebWorkerand previously left ports open until the next build ifemitAffectedFiles()was skipped due to stylesheet errors. Also replacecrypto.randomUUID()per component stylesheet request inparallel-worker.tswith an incrementing numeric request counter.Benchmark
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