[heft-typescript@next] Add "useTranspilerWorker" option #4120
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dmichon-msft
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iclanton,
octogonz,
apostolisms and
D4N14L
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iclanton
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May 18, 2023
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Summary
Adds a new option in
typescript.json,useTranspilerWorker, that iftrue, and the tsconfig hasisolatedModules: true, will split transpilation into a worker thread and run it in parallel with the type checker.Details
If opted in and the tsconfig is compatible, will start a worker thread and hand it the list of changed source files and the emit options. Multi-emit then occurs only in the worker, since declaration files are only emitted for the primary module kind.
How it was tested
Local runs on projects in various configurations. Still needs more testing against large projects with
isolatedModules: trueto determine if the performance is significantly improved.Verified in both watch and non-watch mode.
Verified using project references.
Impacted documentation
Documentation for
typescript.json.