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fix: CSS @import should inherit parent's exportType over parser config#20838

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alexander-akait merged 2 commits intomainfrom
test/export-type-style-text-mixed-import
Apr 14, 2026
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fix: CSS @import should inherit parent's exportType over parser config#20838
alexander-akait merged 2 commits intomainfrom
test/export-type-style-text-mixed-import

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Summary
fix: CSS @import should inherit parent's exportType over parser config

What kind of change does this PR introduce?
fix

Did you add tests for your changes?
Yes

Does this PR introduce a breaking change?
No

If relevant, what needs to be documented once your changes are merged or what have you already documented?
Nothing

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changeset-bot Bot commented Apr 14, 2026

🦋 Changeset detected

Latest commit: f27d468

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
Name Type
webpack Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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github-actions Bot commented Apr 14, 2026

This PR is packaged and the instant preview is available (1ef747c).

Install it locally:

  • npm
npm i -D webpack@https://pkg.pr.new/webpack@1ef747c
  • yarn
yarn add -D webpack@https://pkg.pr.new/webpack@1ef747c
  • pnpm
pnpm add -D webpack@https://pkg.pr.new/webpack@1ef747c

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codecov Bot commented Apr 14, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.43%. Comparing base (8c7700b) to head (f27d468).
⚠️ Report is 3 commits behind head on main.

❌ Your changes status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files
@@            Coverage Diff             @@
##             main   #20838      +/-   ##
==========================================
- Coverage   91.44%   91.43%   -0.01%     
==========================================
  Files         562      562              
  Lines       55438    55438              
  Branches    14636    14636              
==========================================
- Hits        50695    50691       -4     
- Misses       4743     4747       +4     
Flag Coverage Δ
integration 90.39% <100.00%> (-0.01%) ⬇️
test262 45.94% <0.00%> (+<0.01%) ⬆️
unit 36.25% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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},
plugins: [
new webpack.DefinePlugin({
"process.env.BROWSER": JSON.stringify(true)
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Do we need this?

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No need—I’ll delete it

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Looks good

@xiaoxiaojx xiaoxiaojx force-pushed the test/export-type-style-text-mixed-import branch from 7993485 to b5bab26 Compare April 14, 2026 13:39
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codspeed-hq Bot commented Apr 14, 2026

Merging this PR will degrade performance by 32.19%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
❌ 1 regressed benchmark
✅ 142 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Memory benchmark "future-defaults", scenario '{"name":"mode-production","mode":"production"}' 9.7 MB 7.7 MB +26.32%
Memory benchmark "asset-modules-source", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 264.3 KB 389.7 KB -32.19%

Comparing test/export-type-style-text-mixed-import (f27d468) with main (8c7700b)

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Thanks, will rebase and merge after #20831, so don't worry

xiaoxiaojx and others added 2 commits April 14, 2026 17:00
When a CSS file is @imported by another CSS file, the child module's
exportType should be determined by the parent's exportType first,
falling back to the child's own parser config. Previously the child's
parser config took precedence, which meant a file configured as "text"
would not create a style tag even when @imported by a "style" parent.
@alexander-akait alexander-akait force-pushed the test/export-type-style-text-mixed-import branch from b5bab26 to f27d468 Compare April 14, 2026 14:11
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Types Coverage

Coverage after merging test/export-type-style-text-mixed-import into main will be
98.93%
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@alexander-akait alexander-akait merged commit 1ef747c into main Apr 14, 2026
53 of 57 checks passed
@alexander-akait alexander-akait deleted the test/export-type-style-text-mixed-import branch April 14, 2026 15:59
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