feat(coverage-istanbul): transform coverage using source map#821
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Pull request overview
This PR adds source map transformation support to the Istanbul coverage provider, enabling coverage reports to display results mapped back to the original TypeScript source files instead of the compiled JavaScript. The implementation uses istanbul-lib-source-maps to parse and apply source maps.
Key changes:
- Added
istanbul-lib-source-mapsdependency and its type definitions - Implemented source map URL extraction from compiled JavaScript files using regex patterns
- Created a caching mechanism to avoid redundant file reads for source map URLs
- Integrated source map transformation into the coverage report generation pipeline
Reviewed changes
Copilot reviewed 14 out of 15 changed files in this pull request and generated 8 comments.
Show a summary per file
| File | Description |
|---|---|
| pnpm-lock.yaml | Added istanbul-lib-source-maps v5.0.6 and @types/istanbul-lib-source-maps v4.0.4 dependencies |
| packages/coverage-istanbul/package.json | Updated dependencies list with new source map libraries (alphabetically sorted) |
| packages/coverage-istanbul/src/utils.ts | Implemented getSourceMappingURL, registerSourceMapURL, and transformCoverage functions for source map handling |
| packages/coverage-istanbul/src/provider.ts | Integrated source map URL registration and coverage transformation into the provider workflow |
| e2e/test-coverage/sourcemap.test.ts | Added E2E test validating source map transformation from compiled JS back to original TS |
| e2e/test-coverage/fixtures/test/sourcemapMapping.test.ts | Test fixture importing and testing compiled JavaScript with source maps |
| e2e/test-coverage/fixtures/src/sourcemap.ts | Source TypeScript file for testing source map transformation |
| e2e/test-coverage/fixtures/rstest.sourcemap.config.ts | Configuration file for source map E2E test |
| e2e/test-coverage/fixtures/rstest.*.config.ts | Excluded new source map test from other coverage test configurations |
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9aoy
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Jan 8, 2026
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Summary
This PR extracts
sourceMapUrlfrom js files and usesistanbul-lib-source-mapsto map coverage back to the original source code.Related Links
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