fix(@angular/build): aggregate parallel worker performance timings on the main thread#33429
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… the main thread Rather than having the parallel worker thread print its cumulative durations separately to the console (which causes console spam and disjointed/incomplete final logs), we serialize and return the worker's durations to the main thread upon completing the diagnostics task. The main thread then merges them into the global cumulative durations map, producing a single, complete, and perfectly aggregated performance report at the end of the build.
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This pull request introduces profiling duration tracking for parallel compilation by gathering cumulative durations from the worker thread during the diagnose task and merging them back on the main thread. Feedback suggests extending this tracking to include the initialize and emit tasks to prevent losing their profiling data, and refactoring mergeCumulativeDurations to accept undefined to simplify caller-side checks.
clydin
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Jun 23, 2026
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Rather than having the parallel worker thread print its cumulative durations separately to the console (which causes console spam and disjointed/incomplete final logs), we serialize and return the worker's durations to the main thread upon completing the diagnostics task. The main thread then merges them into the global cumulative durations map, producing a single, complete, and perfectly aggregated performance report at the end of the build.