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fix(@angular/build): enforce library compilerOptions and skip app-only target warning - #34437
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alan-agius4 merged 6 commits intoOct 20, 2026
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….tsbuildinfo emit Ensure library compilations explicitly set `noEmit: false`, `emitDeclarationOnly: false`, and `emitDecoratorMetadata: false` in `transformCompilerOptions` so that configurations extending a root `tsconfig.json` with `noEmit` or `emitDeclarationOnly` still emit both JavaScript and declaration files. Additionally, skip the application-specific `target < ES2022` Browserslist warning and `useDefineForClassFields = false` fallback when compiling libraries, and avoid serializing and writing on-disk `.tsbuildinfo` files during library builds since library outputs are emitted into in-memory maps on cold builds and watch rebuilds reuse the in-memory `BuilderProgram` directly.
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This pull request updates the compiler options transformation logic for Angular libraries. Specifically, it ensures that when building a library, options such as noEmit, emitDeclarationOnly, and emitDecoratorMetadata are explicitly overridden to false to ensure proper generation of both JavaScript and declaration files. Additionally, it skips the application-only target warning for libraries. Unit and behavior tests have been added to verify these behaviors. I have no feedback to provide as there are no review comments.
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Ensure library compilations explicitly set
noEmit: falseandemitDeclarationOnly: falseintransformCompilerOptionsso that configurations extending a roottsconfig.jsonwithnoEmitoremitDeclarationOnlystill emit both JavaScript and declaration files.Additionally, apply library
compilerOptionsoverrides before thetarget < ES2022check so the application-specific Browserslist warning anduseDefineForClassFields = falsefallback are skipped when compiling libraries.