perf(@angular/build): avoid loading compiler-cli and typescript in JS transform worker - #34189
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… transform worker Previously, `OxcLinker` imported `ConsoleLogger` and `LogLevel` directly from `@angular/compiler-cli`. Even though `@angular/compiler-cli/linker` is an isolated, lightweight runtime (depending only on `semver` and `convert-source-map`), resolving the main `@angular/compiler-cli` entry point (`bundles/index.js`) eagerly evaluated the full `ngtsc` compiler toolchain and required the 10 MB `typescript.js` bundle at the top level. As a result, every worker isolate in the JavaScript transformer pool unnecessarily loaded TypeScript and 50+ compiler modules upon bootstrap, incurring ~150 ms of startup CPU latency and allocating ~12 MB of heap per worker thread.
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This pull request replaces the runtime dependency on ConsoleLogger and LogLevel from @angular/compiler-cli with a custom defaultLogger implementation. A review comment suggests improving defaultLogger by ensuring its logging methods respect the configured log level and implementing the debug method properly.
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Sep 28, 2026
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Previously,
OxcLinkerimportedConsoleLoggerandLogLeveldirectly from@angular/compiler-cli. Even though@angular/compiler-cli/linkeris an isolated, lightweight runtime (depending only onsemverandconvert-source-map), resolving the main@angular/compiler-clientry point (bundles/index.js) eagerly evaluated the fullngtsccompiler toolchain and required the 10 MBtypescript.jsbundle at the top level.As a result, every worker isolate in the JavaScript transformer pool unnecessarily loaded TypeScript and 50+ compiler modules upon bootstrap, incurring ~150 ms of startup CPU latency and allocating ~12 MB of heap per worker thread.