revert: hold back output.environment.topLevelAwait for the patch release - #21881
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The pending release is a patch, so #21867's feature half is disabled: the new `output.environment.topLevelAwait` option and the startup `await` of an async ESM entry that it gates. The option is what made the changeset minor, and the await cannot be emitted safely without it. The lib code is commented out in place with a marker so it can be reapplied after the release; the schema entry is removed instead, JSON carrying no comments, and the generated files are restored to what the generator emitted for that schema. `ModuleLibraryPlugin` still awaits a module library's entry, as it did before #21867, and the five test262 top-level-await rejection cases go back to `knownBugs`. The rest of #21867 — the `import()` options checks, the circular-reexport severity and the namespace-import assignment error — is unchanged.
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| webpack | Patch |
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This PR is packaged and the instant preview is available (1e2941b). Install it locally:
npm i -D webpack@https://pkg.pr.new/webpack@1e2941b
yarn add -D webpack@https://pkg.pr.new/webpack@1e2941b
pnpm add -D webpack@https://pkg.pr.new/webpack@1e2941b |
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Included review availability: Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe change removes top-level await target and schema support, restores synchronous ESM entry startup, updates conformance and environment snapshots, skips affected test262 cases, and changes the webpack changeset to a patch release. ChangesESM correctness rollback
Suggested labels: Merge Risk: ⚪ Minimal · up to This PR holds back an unreleased configuration option and its associated startup behavior for the patch release, restoring the prior released behavior. No actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 3 | ❌ 1❌ Failed checks (1 inconclusive)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #21881 +/- ##
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+ Coverage 95.08% 95.09% +0.01%
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Files 702 702
Lines 90718 90696 -22
Branches 27381 27366 -15
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- Hits 86255 86247 -8
+ Misses 4463 4449 -14
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Generated code sizeComparing
2 asset(s) changed size
2 asset(s) this pull request no longer emits
No runtime that both runs build changed which runtime modules it carries. 2 runtime(s) this pull request adds or no longer builds
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Inline comments:
In @.changeset/010-esm-correctness.md:
- Line 5: Shorten the changeset summary sentence to 80 characters or fewer while
preserving its meaning, and retain the required imperative form with a trailing
period.
In `@lib/config/target.js`:
- Around line 272-274: Shorten deferred-implementation comments to no more than
two short lines: in lib/config/target.js ranges 272-274, 335-336, 388-389,
447-449, 499-501, and 531-532, replace each disabled target-property block with
one reapplication note; in lib/config/browserslistTargetHandler.js range
431-450, remove the commented Browserslist table and retain a short note; in
lib/config/defaults.js range 1750-1756, remove the commented default block and
retain a short note; in test/test262.spectest.js range 1028-1031, reduce the
rationale to two short lines or fewer.
In `@lib/RuntimeTemplate.js`:
- Around line 572-575: Remove the commented-out supportsTopLevelAwait
implementation in lib/RuntimeTemplate.js:572-575 and replace it with at most a
two-line tracking comment. Remove the disabled entry-await setup in
lib/javascript/JavascriptModulesPlugin.js:1683-1705, the disabled per-entry
await logic at :1832-1845, and the disabled post-startup await logic at
:1893-1901; preserve active behavior and leave implementation history to issue
or commit records.
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declarations/WebpackOptions.d.tsis excluded by!declarations/**schemas/WebpackOptions.check.jsis excluded by!schemas/**/*.check.jstest/__snapshots__/Cli.basictest.js.snapis excluded by!**/*.snap,!test/**/__snapshots__/**test/__snapshots__/target-browserslist.unittest.js.snapis excluded by!**/*.snap,!test/**/__snapshots__/**types.d.tsis excluded by!types.d.ts
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.changeset/010-esm-correctness.mdlib/RuntimeTemplate.jslib/config/browserslistTargetHandler.jslib/config/defaults.jslib/config/target.jslib/javascript/JavascriptModulesPlugin.jsschemas/WebpackOptions.jsontest/Defaults.unittest.jstest/EcmaConformance.unittest.jstest/configCases/ecmaVersion/browserslist-config-env-extends/webpack.config.jstest/configCases/ecmaVersion/browserslist-config-env/webpack.config.jstest/configCases/ecmaVersion/browserslist-config-extends/webpack.config.jstest/configCases/ecmaVersion/browserslist-config/webpack.config.jstest/configCases/ecmaVersion/browserslist-env/webpack.config.jstest/configCases/ecmaVersion/browserslist-extends/webpack.config.jstest/configCases/ecmaVersion/browserslist-query-with-config-file/webpack.config.jstest/configCases/ecmaVersion/browserslist-query/webpack.config.jstest/configCases/ecmaVersion/browserslist/webpack.config.jstest/configCases/module/async-entry-await-multiple/first.jstest/configCases/module/async-entry-await-multiple/index.jstest/configCases/module/async-entry-await-multiple/test.filter.jstest/configCases/module/async-entry-await-multiple/webpack.config.jstest/configCases/module/async-entry-await/index.jstest/configCases/module/async-entry-await/test.filter.jstest/configCases/module/async-entry-await/webpack.config.jstest/helpers/ecmaConformance.jstest/test262.spectest.js
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- test/configCases/module/async-entry-await-multiple/webpack.config.js
- test/configCases/module/async-entry-await/index.js
- test/configCases/ecmaVersion/browserslist-query-with-config-file/webpack.config.js
- test/configCases/ecmaVersion/browserslist-extends/webpack.config.js
- test/configCases/ecmaVersion/browserslist/webpack.config.js
- test/configCases/ecmaVersion/browserslist-env/webpack.config.js
- test/configCases/module/async-entry-await-multiple/first.js
- test/configCases/ecmaVersion/browserslist-config-env-extends/webpack.config.js
- test/configCases/module/async-entry-await/test.filter.js
- test/configCases/module/async-entry-await-multiple/test.filter.js
- test/configCases/ecmaVersion/browserslist-config-env/webpack.config.js
- test/configCases/ecmaVersion/browserslist-query/webpack.config.js
- test/configCases/ecmaVersion/browserslist-config-extends/webpack.config.js
- test/configCases/module/async-entry-await/webpack.config.js
- test/configCases/ecmaVersion/browserslist-config/webpack.config.js
- test/configCases/module/async-entry-await-multiple/index.js
- schemas/WebpackOptions.json
- test/Defaults.unittest.js
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Merging this PR will degrade performance by 21.11%
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Commented-out blocks broke the repository's limit of two short lines per comment in lib/ and test/. Keep one note where the absence needs explaining — the missing environment default, and the entry that is no longer awaited — and leave the implementation to the commit history: reverting this pull request restores it.
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Sep 3, 2026
…ase (#21915) * revert: restore output.environment.topLevelAwait after the patch release Reverts #21881, which held back the feature half of #21867 so 5.110.3 could ship as a patch. That release is out, so the option and the startup `await` of an async ESM entry come back, together with their config cases, snapshots and conformance classifier, and the five test262 top-level-await rejection cases leave `knownBugs` again. The changeset the hold-back edited was consumed by 5.110.3, so this adds a new minor one instead. `added: 5.111.0` still matches: main is 5.110.3 with one patch changeset pending, and this minor takes the next release to 5.111.0. `schemas/WebpackOptions.check.js` is minified onto one line, so git could not merge it against #21886's schema change. It was rebuilt by applying the generator's own four insertions for this option to main's validator, then checked against the option and its neighbours. * test(module): make the multi-entry await case discriminate Both async entries resolved on a zero-delay timer, so the earlier one had already settled by the time the later one did: awaiting only the last entry passed the case. Slow the first entry down so it fails. Also shorten the comment above canAwaitEntry to the two lines lib/ allows.
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Summary
The next release should be a patch, but #21867 shipped a
minorchangeset because it added theoutput.environment.topLevelAwaitoption. This holds back that option and the startupawaitof an async ESM entry that it gates — they are one unit, since theawaitmay only be emitted where the target can parse it — and flips the changeset topatch. Thelib/code is commented out in place with a marker so it can be reapplied after the release; the schema entry is removed instead, as JSON carries no comments, and the generated files are restored to what the generator emits for that schema.ModuleLibraryPluginstill awaits a module library's entry, exactly as it did before #21867. Refs #21867.What kind of change does this PR introduce?
revert
Did you add tests for your changes?
No — this removes tests along with the feature: the two
test/configCases/module/async-entry-await*cases are dropped, thetopLevelAwaitentries are reverted out oftest/Defaults.unittest.js,test/EcmaConformance.unittest.js,test/helpers/ecmaConformance.js, theecmaVersion/browserslist*inline snapshots and theCli/target-browserslistsnapshots, and the fivemodule-code/top-level-await/*rejection cases go back intoknownBugsintest/test262.spectest.js.Does this PR introduce a breaking change?
No —
output.environment.topLevelAwaithas not been released, so no configuration in the wild can reference it.If relevant, what needs to be documented once your changes are merged or what have you already documented?
n/a — the option is not documented yet; it should be documented when this is reapplied in the next minor.
Use of AI
Yes. Claude Code was used to identify which parts of #21867 caused the
minorbump, to comment out the correspondinglib/code and revert the affected tests and generated files, and to draft this description. The result was reviewed against the original commit hunk by hunk. Note thatyarn installcould not run in that environment (thetoolingdevDependency is fetched fromcodeload.github.com, which was blocked), so lint and the test suites were not run locally — CI is the first full run.Generated by Claude Code
Summary by CodeRabbit
Bug Fixes
import().Compatibility
awaitenvironment detection and asynchronous entry handling.topLevelAwaitenvironment option from configuration and generated metadata.Tests
awaitrejection scenarios from conformance testing.