refactor(@angular/build): defer sourcemap remapping in javascript transformer worker - #33795
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alan-agius4 merged 1 commit intoAug 6, 2026
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This pull request refactors sourcemap handling in the Angular build tools by deferring and chaining remapping. Instead of remapping input sourcemaps directly within the OXC linker and transform steps, they now return decoded sourcemaps. The javascript-transformer-worker accumulates these maps and performs a single chained remapping at the end. Feedback on these changes suggests utilizing the pre-loaded input map from the coverage instrumentation step to prevent omitting coverage sourcemaps, and adding a corresponding unit test to verify this behavior.
…nsformer worker Refactor the JavaScript transformer worker to collect intermediate decoded source maps in memory across pipeline passes and execute sourcemap remapping only once at the end of transformation. In addition, cache the oxc-transform module at module scope to avoid allocating dynamic import promises for every transformed file, and update oxc-linker and oxc-transform to directly return raw DecodedSourceMap objects without internal input sourcemap loading or intermediate remapping.
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Refactor the JavaScript transformer worker to collect intermediate decoded source maps in memory across pipeline passes and execute sourcemap remapping only once at the end of transformation. In addition, cache the oxc-transform module at module scope to avoid allocating dynamic import promises for every transformed file, and update oxc-linker and oxc-transform to directly return raw DecodedSourceMap objects without internal input sourcemap loading or intermediate remapping.