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refactor(@angular/build): support library compilation in AngularCompilation - #34174
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alan-agius4 merged 2 commits intoSep 28, 2026
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This pull request introduces support for compiling Angular libraries by adding a buildType parameter ('application' or 'library') across the compilation pipeline and adjusting compiler options and emit behavior accordingly. The feedback highlights an issue in parallel-worker.ts where the returned compilerOptions object is missing the newly added declarationMap property, which would prevent the main thread from receiving the correct configuration during parallel compilation.
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Adds library compilation support (
buildType: 'application' | 'library') toAngularCompilation,TypeScriptCompilation,AotCompilation, andtransformCompilerOptions:declarationMap,compilationMode, andpathsoverrides inCompilerOptionOverrides.declaration,importHelpers,Bundlermodule resolution, externalsourceMap, and TypeScript transpilation) whenbuildType === 'library'.SourceFile(.js,.d.ts,.d.ts.map) inAotCompilation.emitAffectedFiles()and skip application-only transformers (replaceBootstrap,webWorkerTransform,lazyRoutesTransformer) during library emission.