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perf: release a module source's redundant buffer after hashing - #22294

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perf/release-module-source-buffer
Sep 24, 2026
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perf/release-module-source-buffer

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@alexander-akait

@alexander-akait alexander-akait commented Sep 24, 2026 •

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Summary

Hashing a module's source reads its bytes, so a string-backed source comes out of _initBuildHash holding its content twice — once as the string the parser read, once as the buffer the hash consumed — and keeps both for the rest of the build. On a 1033-module build that is 2.71 MB of buffers retained for nothing, and it scales with project source. This releases the copy once the hash is taken, through the clearCache webpack already uses in SourceMapDevToolPlugin. It is gated to sources carrying no map: a map-carrying source keeps the buffer and drops the string, which the generator then rebuilds, so clearing it unconditionally made that case 2.7 MB worse.

What kind of change does this PR introduce?

perf

Did you add tests for your changes?

Yes — test/unitCases/ModuleSourceRelease.unittest.js drives a real build and asserts both arms at finishModules; it fails without the lib/ change.

Does this PR introduce a breaking change?

No. clearCache drops a derived copy only, so every module build hash, every emitted byte and the compilation hash are byte-identical.

If relevant, what needs to be documented once your changes are merged or what have you already documented?

n/a

Use of AI

AI was used to find the site, write the change and measure it. The numbers are counted, not timed: module sources holding both forms go 1029 → 0 and retained buffers 2.71 MB → 0 on a three.js + lodash-es build, with arrayBuffers 14.19 → 11.27 MB; the devtool: "source-map" arm is unchanged, over three runs each. Peak RSS moved inside the run-to-run spread, so no timing claim is made.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SATR3eY1u1eFNvdcuz5Tgu


Generated by Claude Code

Summary by CodeRabbit

  • Bug Fixes
    • Reduced memory retained during builds by releasing redundant source data after it has been hashed. This can lower build memory usage without changing the source content returned by modules.
    • Source map behavior remains unchanged.

Hashing a module's source reads its bytes, so a string-backed source
comes out of the build hash holding its content twice: once as the
string the parser read and once as the buffer the hash consumed. On a
1033-module build that is 2.71 MB of buffers retained for nothing.

Release the copy once the hash is taken, where the source carries no
map — a map-carrying source keeps the buffer and drops the string, which
the generator then rebuilds, so it is left alone.
@changeset-bot

changeset-bot Bot commented Sep 24, 2026

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🦋 Changeset detected

Latest commit: 0e3958f

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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coderabbitai Bot commented Sep 24, 2026 •

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Review in Change Stack →

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📝 Walkthrough

Walkthrough

NormalModule conditionally clears the cached source string after updating the build hash when source maps are not used. Unit tests check the cache contents and source text with source maps disabled and enabled.

Changes

Module source release

Layer / File(s) Summary
Conditional source cache clearing
lib/module/NormalModule.js, test/unitCases/ModuleSourceRelease.unittest.js, .changeset/043-module-source-release.md
NormalModule clears the cached source string after hashing when source maps are not used and clearCache is available. Tests check the cache contents and source text with source maps disabled and enabled. The changeset declares a patch release.

Suggested labels: area: build-perf

Priority: ⬇️ Low

Change: Refactor

Merge Risk: ⚪ Minimal · up to 0e395

No merge-blocking issue was identified; the asset-bytes path retains only the buffer it needs.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name Status Explanation Resolution
Title check ❓ Inconclusive The title uses valid Conventional Commit syntax and accurately describes the performance change. The branch prefix is not provided, so the required match between the commit type and branch prefix cann… Provide the branch name or branch prefix to verify that perf matches it.
✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Full details: Title check

Explanation

The title uses valid Conventional Commit syntax and accurately describes the performance change. The branch prefix is not provided, so the required match between the commit type and branch prefix cannot be verified.

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🔧 ESLint

If the error stems from missing dependencies, add them to the package.json file. For unrecoverable errors (e.g., due to private dependencies), disable the tool in the CodeRabbit configuration.

lib/module/NormalModule.js

ESLint failed to execute (timeout).

test/unitCases/ModuleSourceRelease.unittest.js

ESLint skipped: the matched ESLint configuration already failed (timeout).


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This PR is packaged and the instant preview is available (55d6530).

Install it locally:

  • npm
npm i -D webpack@https://pkg.pr.new/webpack@55d6530
  • yarn
yarn add -D webpack@https://pkg.pr.new/webpack@55d6530
  • pnpm
pnpm add -D webpack@https://pkg.pr.new/webpack@55d6530

@coderabbitai coderabbitai Bot added the area: build-perf Build time and memory of webpack itself label Sep 24, 2026
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Types Coverage

Coverage after merging perf/release-module-source-buffer into main will be
98.29%
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Generated code size

Comparing base (951d0c6) to head (0e3958f). Merging this pull request will not change the code webpack generates.

What moved Tests Assets Gzip Raw Test edit
Changed, test untouched 0 0 — — —
Changed, test edited 0 0 — — —
New 0 0 — — —
Deleted 0 0 — — —
Unchanged — 8201 — — —

Read Changed, test untouched first: the test is byte-identical on both sides, so webpack generated the difference. Changed, test edited moved partly because the test did — Test edit is how many bytes the test gained, and a bundle that grew by less is not a regression. New and Deleted are whole files, not deltas, so adding tests cannot bury a real change. Gzip decides, because that is what users download; raw is the tiebreak, and brotli and zstd are per asset below.

No asset changed size.

No runtime gained or lost a runtime module.

Built test/configCases with the defaults a user gets: 2269 test(s), 8201 asset(s), 96 emitted nothing.

@codecov

codecov Bot commented Sep 24, 2026 •

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.61%. Comparing base (951d0c6) to head (0e3958f).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main   #22294   +/-   ##
=======================================
  Coverage   95.60%   95.61%           
=======================================
  Files         761      761           
  Lines      105454   105460    +6     
  Branches    32555    32559    +4     
=======================================
+ Hits       100823   100832    +9     
+ Misses       4631     4628    -3     
Flag Coverage Δ
css-parsing 24.70% <100.00%> (+<0.01%) ⬆️
html5lib 27.36% <100.00%> (+<0.01%) ⬆️
integration 84.20% <100.00%> (+<0.01%) ⬆️
syntax-equivalence 78.70% <ø> (ø)
test262 45.02% <100.00%> (+<0.01%) ⬆️
unit 75.30% <100.00%> (+<0.01%) ⬆️

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@codspeed

codspeed Bot commented Sep 24, 2026

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Merging this PR will regress 1 benchmark

⚠️ 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

⚡ 3 improved benchmarks
❌ 1 regressed benchmark
✅ 396 untouched benchmarks
⏩ 6 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Memory unit benchmark "js-parser-unit", source 'lodash-es' 108.7 KB 271.1 KB -59.92%
⚡ Memory benchmark "many-chunks-commonjs", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 467 KB 184.5 KB ×2.5
⚡ Memory benchmark "concatenate-modules", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 2.6 MB 1.3 MB ×2.1
⚡ Memory benchmark "three-long", scenario '{"name":"mode-production","mode":"production"}' 10.8 MB 8.9 MB +21.31%

Tip

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


Comparing perf/release-module-source-buffer (0e3958f) with main (a924765)2

Open in CodSpeed

Footnotes

  1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

  2. No successful run was found on main (951d0c6) during the generation of this report, so a924765 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

@alexander-akait
alexander-akait merged commit 55d6530 into main Sep 24, 2026
69 checks passed
@alexander-akait
alexander-akait deleted the perf/release-module-source-buffer branch September 24, 2026 15:03
markharding pushed a commit to futo-org/Harbor that referenced this pull request Oct 20, 2026
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [webpack](https://github.com/webpack/webpack) | [`5.111.1` → `5.112.0`](https://renovatebot.com/diffs/npm/webpack/5.111.1/5.112.0) | ![age](https://developer.mend.io/api/mc/badges/age/npm/webpack/5.112.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/webpack/5.111.1/5.112.0?slim=true) |

---

> ⚠️ **Warning**
>
> Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/99) for more information.

---

### Release Notes

<details>
<summary>webpack/webpack (webpack)</summary>

### [`v5.112.0`](https://github.com/webpack/webpack/blob/HEAD/CHANGELOG.md#51120)

[Compare Source](webpack/webpack@v5.111.1...v5.112.0)

##### Minor Changes

- Apply `plugins` set on a multi-configuration array to the `MultiCompiler`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22702](webpack/webpack#22702))

- Add `optimization.minimize.css.dropOverriddenDeclarations`, dropping a declaration a later one overrides where no target is named. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22175](webpack/webpack#22175))

- Export more plugins under their scope, move eleven loose exports under theirs, deprecate the old, and expose `template.DependencyTemplate`, `module.NullFactory` and `util.makeSerializable`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22261](webpack/webpack#22261))

- Let `util.makeSerializable` take several requests, current one first. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22340](webpack/webpack#22340))

- Emit the source map `scopes` field, so a debugger resolves imported ESM bindings by name. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;21999](webpack/webpack#21999))

- Add `library.entryExports: "all"` to expose the exports of every entry module. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22235](webpack/webpack#22235))

- Recognize a required `const` binding assigned to `exports` as a re-export. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22276](webpack/webpack#22276))

- Accept glob patterns in more path, module and file filter options. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22422](webpack/webpack#22422))

- Bundle a run of inline `<script>` tags into one chunk the page can inline. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22188](webpack/webpack#22188))

- Add `module.parser.javascript.topLevelThis` for classic-script `this` semantics. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22193](webpack/webpack#22193))

- Add `module.parser.html.chunkName` and a `webpackChunkName` comment for tags. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22200](webpack/webpack#22200))

- Add `include`/`exclude` version and request filters to shared modules. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22297](webpack/webpack#22297))

- Keep module side-effect information in ESM output as PURE annotations. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;21789](webpack/webpack#21789))

- Add `optimization.splitChunks.dedupDepth` to discover chunk intersections. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22240](webpack/webpack#22240))

- Add `optimization.minimizeOptions.json`, on by default with `futureDefaults`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22286](webpack/webpack#22286))

- Add `SSRManifestPlugin` and fix server-rendered CSS collection and adoption. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;21913](webpack/webpack#21913))

- Add an `ignore` hook to `output.copy` and keep unfollowed `from` symlinks. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22216](webpack/webpack#22216))

- Add `optimization.minimize.css.convertApproximateColors`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22157](webpack/webpack#22157))

- Add XML parsing and SVG/XML minification with data URLs and attribute sorting. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22269](webpack/webpack#22269))

- Extract CSS/HTML license comments like JS and safely shorten CSS gradients. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22408](webpack/webpack#22408))

- Resolve an async `DefinePlugin.runtimeValue` over an async `beforeParse` hook. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22210](webpack/webpack#22210))

- Add CSS `customMedia`/`customSelectors` minimize options; resolve chained names. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22360](webpack/webpack#22360))

- Rename the `Harmony*` names to `ESM*` and deprecate the old spellings. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22283](webpack/webpack#22283))

- Reduce `css.syntax`/`html.syntax` to `parser`, `printer`, `SourceProcessor` with one node path. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22233](webpack/webpack#22233))

- Add a JavaScript `SyntaxTree` read like the CSS one, and `toEstreeObject`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22608](webpack/webpack#22608))

- Fix minified code that threw, and add `pure_conversions` and `pure_heritage`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22473](webpack/webpack#22473))

- Shorten more CSS values and selectors, fold longhands, order declarations and gather layer blocks. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22442](webpack/webpack#22442))

- Add `optimization.minimize.css.charset`; `false` drops `@charset` for UTF-8 CSS. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22632](webpack/webpack#22632))

##### Patch Changes

- Join rules a gathered `@layer` leaves adjacent, and an at-rule with a later one (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22204](webpack/webpack#22204))
  stating the same condition; read what a condition declares.

- Read escaped CSS names and functions as spelled, and minify them unescaped. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22262](webpack/webpack#22262))

- Minify JavaScript, CSS and HTML assets whose names carry a `#fragment`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22277](webpack/webpack#22277))

- Require `minimizer-webpack-plugin` 5.12, so inline scripts in HTML minify again. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22296](webpack/webpack#22296))

- Minify the attributes of an HTML tag without rewriting the template in it. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22166](webpack/webpack#22166))

- Order joined at-rule selector lists and gather a repeated large `@layer` block. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22224](webpack/webpack#22224))

- Preserve case-sensitive template identifiers when minifying HTML tag attributes. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22177](webpack/webpack#22177))

- Match Acorn's strict directives, Unicode identifiers and expression validation. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22185](webpack/webpack#22185))

- Skip concatenating modules when `optimization.providedExports` is disabled. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22410](webpack/webpack#22410))

- Join rules a nesting lowering or duplicate drop left for a second pass. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22268](webpack/webpack#22268))

- Write U+00A0 in a minified HTML attribute as the character, not `&nbsp;`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22208](webpack/webpack#22208))

- Escape a foreign `<script>` or `<style>` body, which is character data. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22233](webpack/webpack#22233))

- Name the runtime module whose generation fails while hashing. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22203](webpack/webpack#22203))

- Rebuild a module in watch when its missing unused dependencies swap. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22693](webpack/webpack#22693))

- Rebuild in watch mode when a file is deleted while a build is running. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22650](webpack/webpack#22650))

- Take out the declaration a lowered shorthand writes over, which its source spelling made look like a fallback. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22270](webpack/webpack#22270))

- Read a foreign `<script>` or `<style>` body as character data, not as raw text. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22258](webpack/webpack#22258))

- Keep an inline `<style>` body as written when rebuilding a page webpack emitted. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22265](webpack/webpack#22265))

- Fix minified HTML for `style` spellings, CSS quotes, `<noscript>` and a BOM. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22370](webpack/webpack#22370))

- Record a build dependency required through a spread on Bun. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22230](webpack/webpack#22230))

- Write a nested selector opening on a combinator against its parent the way the printer writes one. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22271](webpack/webpack#22271))

- Fix missing async stylesheets with a shared runtime. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22659](webpack/webpack#22659))

- Support deferred imports introduced by hot updates. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22668](webpack/webpack#22668))

- Fix trailing commas in `require.resolve()` and `require.resolveWeak()` calls. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22658](webpack/webpack#22658))

- Keep regular expressions, functions and plugins distinct in resolver caches. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22667](webpack/webpack#22667))

- Order the list a lowered nested selector lands in on what is written, not on what was. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22287](webpack/webpack#22287))

- Hoist a vendor-prefixed nested rule for a target that reads no nesting. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22308](webpack/webpack#22308))

- Name a hoisted nested rule in the dark-scheme copy it writes. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22318](webpack/webpack#22318))

- Minify data: URL payloads in HTML attributes and `new URL`, and web manifests. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22300](webpack/webpack#22300))

- fold a fallback's colors over the author's arguments, and print with (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22314](webpack/webpack#22314))
  `recurseBlocks: false` rather than throwing

- Read a regular expression repeating a capture group name in linear time. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22187](webpack/webpack#22187))

- Make lazy barrels defer import declarations and keep no deferral across compilations. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22359](webpack/webpack#22359))

- Invalidate unaffected caches when connection activity or async status changes. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22431](webpack/webpack#22431))

- Order concatenated re-exports deterministically when their source order ties. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22697](webpack/webpack#22697))

- Regenerate a module's exports when a require() cycle forms or breaks around it. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22644](webpack/webpack#22644))

- Recompute re-exports, code and warnings when a module goes missing or returns. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22432](webpack/webpack#22432))

- Preserve loader resolution dependencies across cached rebuilds. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22430](webpack/webpack#22430))

- Read unwatched changes afresh and wait for restarted watch compilers to finish. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22646](webpack/webpack#22646))

- Parse loader output for `.wasm` as JavaScript when async wasm is auto-enabled. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22556](webpack/webpack#22556))

- Remove modules an async chunk inherits from a named parent chunk grown later. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22555](webpack/webpack#22555))

- Fix JavaScript minifier crashes, altered behavior, lost comments, unparsable output and null source map sources, including parameter aliases, ESTree trees and preserved names, and stop it writing into the caller's parse options. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22352](webpack/webpack#22352))

- Preserve the source phase of dynamic WebAssembly import contexts. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22604](webpack/webpack#22604))

- Await every async entry before resolving an ESM library import. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22617](webpack/webpack#22617))

- Keep unknown `import.meta` properties per module, alike for aliases and direct use. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22618](webpack/webpack#22618))

- Return WebAssembly modules directly from eager and weak source imports. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22606](webpack/webpack#22606))

- Handle missing ESM hot update manifests in Node.js without failing HMR checks. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22613](webpack/webpack#22613))

- Speed up JavaScript parsing: comment lookup, the tokenizer and the grammar. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22179](webpack/webpack#22179))

- Name a core module external by its key whichever spelling the code uses. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22565](webpack/webpack#22565))

- Prefix and drop 2009 flexbox names, keeping them where a box lays out by them. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22320](webpack/webpack#22320))

- Keep `initial` where Gecko or WebKit reads the property's keyword apart. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22176](webpack/webpack#22176))

- Fold `calc()` as lightningcss does, keeping it where a bare value is refused. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22205](webpack/webpack#22205))

- Keep a `color-mix()` whose hue rests on a gray's conversion residue. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22198](webpack/webpack#22198))

- Keep a shorthand's initial keyword where it parts two keywords of another slot. (by [@&#8203;dependabot](https://github.com/apps/dependabot) in [#&#8203;22518](webpack/webpack#22518))

- Group `lib/` and `lib/dependencies/` sources into directories. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22118](webpack/webpack#22118))

- Treat a browserslist target given at a bare major version (e.g. `safari 10`) as `<major>.0` when a feature's first supported version is a `[major, minor]` pair, so it is no longer reported as unsupported. (by [@&#8203;Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#&#8203;22280](webpack/webpack#22280))

- Keep the last HMR update with `output.clean`; stop rechecking removed files. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22339](webpack/webpack#22339))

- Read and print a CSS backslash as the spec does, and a NUL as U+FFFD. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22201](webpack/webpack#22201))

- Make minified CSS and HTML stable on a second pass, even for truncated input. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22290](webpack/webpack#22290))

- Minify a merged `<style>` run as one sheet, closing each where its input ended. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22302](webpack/webpack#22302))

- Minify JavaScript with webpack's printer under `futureDefaults`, `terser` otherwise. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22217](webpack/webpack#22217))

- Preserve `wrappedContextRegExp` flags when rebuilding context request matchers. (by [@&#8203;Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#&#8203;22303](webpack/webpack#22303))

- Minify CSS `@supports`, `@import` and `@custom-media` conditions, and exponent numbers. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22347](webpack/webpack#22347))

- Fold unitless `hsl()`/`hwb()` channels, and only where the separators are valid. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22242](webpack/webpack#22242))

- Split `@value` imports on the `from` keyword, not a substring in the path. (by [@&#8203;Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#&#8203;22306](webpack/webpack#22306))

- Destructure a dotted `DefinePlugin` key whose value is falsy or a runtimeValue. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22215](webpack/webpack#22215))

- Make `Stats.hasErrors()` read errors through the `processErrors` hook (via `getErrors()`), matching `hasWarnings()`, so a plugin that filters errors out of the hook is no longer contradicted by `hasErrors()`. (by [@&#8203;Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#&#8203;22281](webpack/webpack#22281))

- Allow wrapping an external concatenated module, now asked of the module itself, and re-exporting a JSON or asset `default` as a namespace object. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22226](webpack/webpack#22226))

- Match `urlHints` rules written with `and`, `or`, `not` and `glob` conditions; profile hook map taps, such as resolver and parser hooks, in `ProfilingPlugin`; report `import.meta` option errors inside `require.ensure` callbacks, not crash; and replace `any`, `object` and `Function` with precise types in the type definitions. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22681](webpack/webpack#22681))

- Reduce CSS and HTML build time and memory allocation. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22135](webpack/webpack#22135))

- Reuse free names instead of re-parsing modules for the entry IIFE rename. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22206](webpack/webpack#22206))

- Release each module's ast once scope-analysed, and encode each export path once. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22241](webpack/webpack#22241))

- Export a module library entry's default expression as its own binding, and keep (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22227](webpack/webpack#22227))
  the export helpers where the entry is not inlined.

- Give a wrapped concatenated body the same function header as a module factory. (by [@&#8203;hai-x](https://github.com/hai-x) in [#&#8203;22254](webpack/webpack#22254))

- Skip reading every asset when no content hash is named. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22256](webpack/webpack#22256))

- Cut graph, cached set, lazy barrel and ESM import memory and allocations. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22289](webpack/webpack#22289))

- Stop a module source from being held as both a string and a buffer. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22294](webpack/webpack#22294))

- Read the browserslist data and options schema only when a build needs them. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22324](webpack/webpack#22324))

- Release the eval devtool's cached module sources after wrapping them. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22358](webpack/webpack#22358))

- Release the rendered module sources after emitting the chunks. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22365](webpack/webpack#22365))

- Cut the peak memory and time of minifying through webpack's printer. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22368](webpack/webpack#22368))

- Shrink minified JS: unwrap IIFEs, fold calls, drop dead code, split arrays. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22393](webpack/webpack#22393))

- Cut JavaScript minifier time and memory; keep token positions in large inputs. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22329](webpack/webpack#22329))

- Keep the `calc()` around a `steps()` count `jump-none` would reject bare. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22168](webpack/webpack#22168))

- Split the CSS syntax module into a parser file and a printer file. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22222](webpack/webpack#22222))

- Update enhanced-resolve to 5.26.0. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22358](webpack/webpack#22358))

- Update watchpack to 2.6.1. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22670](webpack/webpack#22670))

- Split the HTML syntax module into a parser file and a printer file. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22223](webpack/webpack#22223))

- Rename classes in `lib/` so each says what it does and no two share a name. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22361](webpack/webpack#22361))

- Keep the remote fallback index aligned with registered container externals when an `internal ` external precedes a real one. (by [@&#8203;Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#&#8203;22362](webpack/webpack#22362))

- Stop a minified inlined chunk leaving a doubled `;` in its `<script>`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22370](webpack/webpack#22370))

- Stop `mergeDistantRules` mangling rules or reordering `all`, and merge more. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22370](webpack/webpack#22370))

- Minify by parsing with webpack's own parser rather than terser's. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22397](webpack/webpack#22397))

- Read JavaScript with webpack's parser alone when minifying, refusing early errors. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22397](webpack/webpack#22397))

- Parse an `assert(...)` call after an import with no semicolon, and a regular expression after `yield` in a generator method. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22406](webpack/webpack#22406))

- Keep the private names a direct `eval` reads when mangling. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22412](webpack/webpack#22412))

- Keep a class dropped for its effects where they read a private name it declares. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22421](webpack/webpack#22421))

- Parenthesize the right side of a private `in`, a `yield`, `await`, private `in` or optional chain tagging a template, and a `let` or `async` starting a statement or loop head, where the minifier printed code that no longer parsed or read otherwise. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22437](webpack/webpack#22437))

- Keep a name a parameter list or catch parameter reads from resolving to what the function body or catch block declares, which the minifier renamed or dropped as unused. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22439](webpack/webpack#22439))

- Scope and export a CSS Modules `@value` the same way whether local or imported. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22443](webpack/webpack#22443))

- Keep CSS `border: none` and gradient fallbacks for units a target cannot read. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22567](webpack/webpack#22567))

- Keep minified CSS safe for older browsers; drop dead fallbacks and overrides. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22696](webpack/webpack#22696))

- Keep CSS rules apart from a neighbor whose selector no browser parses. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22634](webpack/webpack#22634))

- Keep an `:nth-*()` argument with a space after its sign as written. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22700](webpack/webpack#22700))

- Keep minified CSS readable by browsers the compat data does not cover. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22701](webpack/webpack#22701))

- Keep a module its chunk still needs after `compilation.rebuildModule()`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22705](webpack/webpack#22705))

- Keep a CSS rule nested under a selector opening on a combinator when lowering. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22707](webpack/webpack#22707))

- Use module paths for webpack's built-in minimizers so parallel minification can load them directly in workers instead of serializing their function sources. (by [@&#8203;xiaoxiaojx](https://github.com/xiaoxiaojx) in [#&#8203;22309](webpack/webpack#22309))

- Keep stats from an earlier build readable after a later build no longer has one of their modules. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22695](webpack/webpack#22695))

</details>

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Reviewed-on: https://code.futo.org/harbor/harbor/pulls/1941
Reviewed-by: Mark Harding <[email protected]>
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