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fix: guard HarmonyAcceptDependency against unresolved module ids#21302

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alexander-akait merged 2 commits into
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fix/harmony-accept-hmr-weak-map-key
Jun 29, 2026
Merged

fix: guard HarmonyAcceptDependency against unresolved module ids#21302
alexander-akait merged 2 commits into
mainfrom
fix/harmony-accept-hmr-weak-map-key

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@xiaoxiaojx

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Summary
Fixes #21300

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

Use of AI
part

Skip unresolved harmony imports when matching HMR accept dependencies,
fixing a WeakMap crash during CSS module HMR codegen (#21300).
@changeset-bot

changeset-bot Bot commented Jun 29, 2026

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🦋 Changeset detected

Latest commit: b2d5451

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

@github-actions

github-actions Bot commented Jun 29, 2026

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This PR is packaged and the instant preview is available (0abec4d).

Install it locally:

  • npm
npm i -D webpack@https://pkg.pr.new/webpack@0abec4d
  • yarn
yarn add -D webpack@https://pkg.pr.new/webpack@0abec4d
  • pnpm
pnpm add -D webpack@https://pkg.pr.new/webpack@0abec4d

@codecov

codecov Bot commented Jun 29, 2026

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.85%. Comparing base (cf9c04e) to head (b2d5451).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main   #21302      +/-   ##
==========================================
- Coverage   92.87%   92.85%   -0.03%     
==========================================
  Files         594      594              
  Lines       64996    65214     +218     
  Branches    18164    18144      -20     
==========================================
+ Hits        60368    60554     +186     
- Misses       4628     4660      +32     
Flag Coverage Δ
css-parsing 28.60% <0.00%> (-0.02%) ⬇️
html5lib 31.13% <0.00%> (+0.05%) ⬆️
integration 88.87% <100.00%> (-0.14%) ⬇️
test262 45.57% <0.00%> (-0.01%) ⬇️
unit 43.07% <0.00%> (+0.07%) ⬆️

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

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📢 Have feedback on the report? Share it here.

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@alexander-akait

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Let’s fix tests

@codspeed-hq

codspeed-hq Bot commented Jun 29, 2026

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Merging this PR will not alter performance

⚠️ 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
❌ 2 regressed benchmarks
✅ 141 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Memory benchmark "wasm-modules-async", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 190.7 KB 330 KB -42.21%
Memory benchmark "asset-modules-bytes", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 246.1 KB 320.1 KB -23.13%
Memory benchmark "many-modules-esm", scenario '{"name":"mode-development","mode":"development"}' 1.9 MB 1.1 MB +69.29%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.


Comparing fix/harmony-accept-hmr-weak-map-key (b2d5451) with main (606712d)

Open in CodSpeed

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Types Coverage

Coverage after merging fix/harmony-accept-hmr-weak-map-key into main will be
99.36%
Coverage Report
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@alexander-akait alexander-akait merged commit 0abec4d into main Jun 29, 2026
62 of 63 checks passed
@alexander-akait alexander-akait deleted the fix/harmony-accept-hmr-weak-map-key branch June 29, 2026 18:57
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Successfully merging this pull request may close these issues.

5.108: Invalid value used as weak map key during HMR codegen for CSS modules (style-loader + css-loader)

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