Keep non-annotation comments when the processor has no plugins - #2150
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clearAnnotation() has two implementations. The AST one removes only a comment whose text starts with `# sourceMappingURL=`, and PreviousMap#loadAnnotation finds annotations by the same marker. The string one, which is the only path NoWorkResult can take, searched for `/*#` and removed every comment that began with it. So postcss().process(css) silently deleted `/*#region */` and `/*#endregion */` folding markers, and any other comment starting with `#`, while the same CSS through a processor with one no-op plugin kept them. It happens with `map` unset too, because NoWorkResult calls clearAnnotation() unconditionally. Searching for the whole `/*# sourceMappingURL=` marker lines the string path up with the other two and keeps the plain string scan.
📝 WalkthroughWalkthrough
ChangesSource-map annotation fix
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🟡 Moderate · up to CSS containing spaced source-map annotations can retain stale 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@lib/map-generator.js`:
- Line 78: Update the source-map annotation matching logic near the annotation
literal in map-generator.js to accept optional horizontal whitespace between /*
and the exact # sourceMappingURL= marker, while preserving existing unspaced
matching behavior. Add a regression case in map.test.ts verifying the spaced
annotation is removed from result.css consistently with the AST path.
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lib/map-generator.jstest/map.test.ts
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With no plugins,
process()deletes every comment beginning with/*#— including the/*#region *///*#endregion */folding markers editors use.This happens with
mapunset too:NoWorkResultalways callsclearAnnotation().clearAnnotation()has two implementations. The AST one removes only comments whose text starts with# sourceMappingURL=, andPreviousMap#loadAnnotationfinds annotations by that marker. The string one — the only pathNoWorkResulttakes — searched for/*#alone.Searching for the whole
/*# sourceMappingURL=marker keeps the plain string scan, so 497daef's move off RegExp stands. The old RegExp had the same gap, anchored to end of line.Two tests added. Reverting
lib/map-generator.jsfails both. A narrower fix keeping the/*#needle and stopping at the first non-annotation still fails the second, where the stray comment follows the annotation.pnpm testgreen: 701/701 unit (699 before), types, size, integration, lint (one pre-existing warning invisitor.test.ts).Unchanged and disclosed: the string path still leaves
/* # sourceMappingURL=… */(space after/*) and appends a second annotation, where the AST path clears it.Drafted with Claude Opus 5 (
claude-opus-5); every claim was executed.Summary by CodeRabbit
Bug Fixes
Tests