fix(css): rewrite root-relative dev CSS sourcemap sources (fixes #23195) - #23281
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santhiprakash wants to merge 3 commits into
Open
fix(css): rewrite root-relative dev CSS sourcemap sources (fixes #23195)#23281santhiprakash wants to merge 3 commits into
santhiprakash wants to merge 3 commits into
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- Problem: lightningcss URL-served CSS maps kept project-root-relative `sources` entries; transformRequest only rebased absolute paths. - Fix: resolve non-absolute sources against the module dir or project root, then emit paths relative to the served CSS file URL. - Verification: pnpm run test-serve sources-resolution.spec (2 passed).
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Problem
With
css.devSourcemap: true, URL-served CSS sourcemaps can keep project-root-relativesourcesentries (Shape 3 in #23195).transformRequestonly rebased absolute paths to be relative to the served module, so browsers resolve those entries against the CSS URL incorrectly and devtools fail to load the underlying files.Triage
main(2026-08-17): bug still present inpackages/vite/src/node/server/transformRequest.ts.main, not a duplicate approach.Fix
When rewriting sourcemap
sources, resolve non-absolute paths against the module directory or project root (whichever keeps the path inside the project), then emit paths relative to the served CSS file URL.Verification
pnpm run build pnpm exec vitest run -c vitest.config.e2e.ts \ playground/css-sourcemap/__tests__/sources-resolution.spec.ts \ playground/css-sourcemap/__tests__/lightningcss/sources-resolution.spec.tsResult: 2 files, 2 tests passed.
Risks
Low — scoped to dev sourcemap path rewriting in
transformRequest; no build output changes.fixes #23195