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fix(cache): count a module's references when restoring its mem cache - #22749

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alexander-akait merged 2 commits into
webpack:mainfrom
aryanraj45:fix/cache-unaffected-references
Oct 18, 2026
Merged

alexander-akait merged 2 commits into
webpack:mainfrom
aryanraj45:fix/cache-unaffected-references

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@aryanraj45

@aryanraj45 aryanraj45 commented Oct 17, 2026 •

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Summary

Found by the rebuild fuzzer. With cacheUnaffected, a module that wasn't rebuilt counts as unaffected when every connection it still has points where it did. A connection that is gone because its target was deleted is never compared, so the module keeps its old memoized exports and code. This stores how many references were recorded and compares that too. A connection that appears needs nothing, because restoring a missing target already rebuilds its importer.

// mid.js, then target.js is deleted
export * from "./target.js";
export const own = 1;

┌────────────────────────────────────────────────┬───────────────────────────────────────────────────────────────────────────────────────────────┐
│ development, cacheUnaffected, after the delete │                                            output                                             │
├────────────────────────────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ main                                           │ __webpack_require__.d(__webpack_exports__, { … a … }), still exporting the deleted module's a │
├────────────────────────────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ this PR / fresh build                          │ /* empty/unused harmony star reexport */                                                      │
└────────────────────────────────────────────────┴───────────────────────────────────────────────────────────────────────────────────────────────┘

export { a as r } from keeps r the same way, and exports.r = require().a keeps a stale content hash. Imports, require(), import() and new URL() were already correct.

What kind of change does this PR introduce?

fix

Did you add tests for your changes?

Yes: test/watchCases/cache/unaffected-deleted-reexport-target deletes and restores the target of export { a as r } from and export * from, and checks the exports the module defines before it throws. It fails on main and with the count check removed, in WatchTestCases and WatchCacheUnaffectedTestCases.

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?

n/a

Use of AI

I used and directed Claude Code to find the bug with a rebuild fuzzer, write the fix and the test, break the fix on purpose, and check coverage. I reviewed every change myself.

Summary by CodeRabbit

  • Bug Fixes
    • Rebuilds now correctly detect when a re-exported module has been deleted, preventing stale cached results and ensuring missing-module errors are reported.
  • Tests
    • Added coverage for deleted re-export targets across named and star exports, with memory and filesystem caching.

With `cacheUnaffected`, a module counted as unaffected when every connection it still had pointed where it did, so a connection gone because its target was deleted went unnoticed and the module kept its re-exports. Store how many references were recorded and compare that too.
@changeset-bot

changeset-bot Bot commented Oct 17, 2026 •

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🦋 Changeset detected

Latest commit: 9d766ea

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

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Reported by Types Coverage #1648 for 9d766ea, computed by this pull request's own code.

Types Coverage

Coverage after merging fix/cache-unaffected-references into main will be
99.24%
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@coderabbitai

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Review in Change Stack →

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration
  • Configuration used: Repository: webpack/webpack/.coderabbit.yaml
  • Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between 36f36bc and 9d766ea.

📒 Files selected for processing: 13
  • .changeset/060-cache-unaffected-deleted-target.md
  • lib/Compilation.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/0/deep.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/0/index.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/0/named.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/0/star.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/0/target.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/0/top.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/1/errors.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/1/target.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/2/target.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/test.config.js
  • test/watchCases/cache/unaffected-deleted-reexport-target/webpack.config.js

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📝 Walkthrough

The change records reference counts for cached maps and checks those counts during comparison. A watch case tests named, star, and chained re-exports when a target module is deleted and restored, with memory and filesystem caching enabled.

Changes: Cache invalidation

Layer / File(s) Summary
Track stored references
lib/Compilation.js, .changeset/060-cache-unaffected-deleted-target.md
computeReferences records the number of stored connections. compareReferences now requires the matched-reference count to equal that recorded count.
Test deleted and restored targets
test/watchCases/cache/unaffected-deleted-reexport-target/*
The watch case covers named, star, and chained re-exports. It checks the export keys across target deletion and restoration with memory and filesystem caching.

Suggested reviewers: alexander-akait

Priority: ➖ Normal

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 9d766

This fix makes cacheUnaffected rebuild a module when one of its re-export targets is deleted. No merge-blocking risk was found.

Pre-merge checks: Passed 3 · Inconclusive 1

Failed Failed checks: 1 inconclusive

Check name Status Explanation Resolution
Title check Inconclusive The title uses the required conventional-commit format, uses the allowed type fix, and accurately describes the cache reference-counting change. The branch name is not provided, so the required type… Provide the branch name or confirm that its prefix is fix. If confirmed, this check passes.
Passed 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 the required conventional-commit format, uses the allowed type fix, and accurately describes the cache reference-counting change. The branch name is not provided, so the required type-to-branch-prefix match cannot be verified.

Resolution

Provide the branch name or confirm that its prefix is fix. If confirmed, this check passes.

  • Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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Reported by Code Size #4986 for 9d766ea, computed by this pull request's own code.

Generated code size

Comparing base (36f36bc) to head (9d766ea). 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 — 8971 — — —

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 — a new asset was created, not grown, so it reads gray (⚪ added) — and 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: 2250 test(s), 8971 asset(s), 100 emitted nothing.

@codspeed

codspeed Bot commented Oct 18, 2026

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Merging this PR will degrade performance by 23.74%

⚠️ 108 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

ℹ️ 29 benchmarks have no flame graph

The flamegraph could not be generated because too much time was spent in runtime internals, making the visualization not useful for performance analysis.

⚠️ 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

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 403 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 "html-parser-document-unit", process (no visitors) 150.8 KB 638 KB -76.36%
⚡ Memory benchmark "devtool-eval-source-map", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 292 KB 188.8 KB +54.67%
⚡ Memory benchmark "import-meta-glob", scenario '{"name":"mode-production","mode":"production"}' 1,139.8 KB 939.6 KB +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 aryanraj45:fix/cache-unaffected-references (9d766ea) with main (36f36bc)

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. ↩

@alexander-akait
alexander-akait merged commit e07791a into webpack:main Oct 18, 2026
65 checks passed
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This PR is packaged and the instant preview is available (e07791a).

Install it locally:

  • npm
npm i -D webpack@https://pkg.pr.new/webpack@e07791a
  • yarn
yarn add -D webpack@https://pkg.pr.new/webpack@e07791a
  • pnpm
pnpm add -D webpack@https://pkg.pr.new/webpack@e07791a

markharding pushed a commit to futo-org/Harbor that referenced this pull request Oct 27, 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) | [`5.112.0` → `5.112.2`](https://renovatebot.com/diffs/npm/webpack/5.112.0/5.112.2) | ![age](https://developer.mend.io/api/mc/badges/age/npm/webpack/5.112.2?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/webpack/5.112.0/5.112.2?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>

### [`v5.112.2`](https://github.com/webpack/webpack/blob/HEAD/CHANGELOG.md#51122)

[Compare Source](webpack/webpack@v5.112.1...v5.112.2)

##### Patch Changes

- Reduce repeated scans when concatenating imported modules. (by [@&#8203;xiaoxiaojx](https://github.com/xiaoxiaojx) in [#&#8203;22865](webpack/webpack#22865))

- Avoid allocating CSS module sets for single-group chunks. (by [@&#8203;xiaoxiaojx](https://github.com/xiaoxiaojx) in [#&#8203;22866](webpack/webpack#22866))

- Return the value of every module type loaded with `importModule()`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22869](webpack/webpack#22869))

### [`v5.112.1`](https://github.com/webpack/webpack/blob/HEAD/CHANGELOG.md#51121)

[Compare Source](webpack/webpack@v5.112.0...v5.112.1)

##### Patch Changes

- Rebuild a lazy barrel in watch when what it defers changes, and keep the imports and re-exports it still runs. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22699](webpack/webpack#22699))

- Rebuild under `cacheUnaffected` a module whose re-export target goes or returns. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22749](webpack/webpack#22749))

- Fix "Self-reference dependency has unused export name" for CommonJS namespace re-exports. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22791](webpack/webpack#22791))

- Fix `exportType: "style"` CSS modules throwing outside the runtime chunk. (by [@&#8203;lazerg](https://github.com/lazerg) in [#&#8203;22833](webpack/webpack#22833))

- Fix crash when a CSS module with `exportType: "style"` imports an ignored stylesheet. (by [@&#8203;codeXsidd](https://github.com/codeXsidd) in [#&#8203;22846](webpack/webpack#22846))

- Keep empty process environment variables that `.env` files don't define in `DotenvPlugin`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22794](webpack/webpack#22794))

- Rehash an ESM entry chunk when a chunk it imports by file name changes. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22804](webpack/webpack#22804))

- Handle a NUL inside an HTML CDATA section the way the parsing spec does. (by [@&#8203;dependabot](https://github.com/apps/dependabot) in [#&#8203;22811](webpack/webpack#22811))

- Keep module exports live across chunks, runtimes, HMR and eval, sparing globals. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22733](webpack/webpack#22733))

- Await asynchronous modules that `ProvidePlugin` injects into ES modules. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22728](webpack/webpack#22728))

- Keep a resolve that ends after the compiler closed from throwing. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22795](webpack/webpack#22795))

- Preserve string names passed to SharedWorker constructors. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22770](webpack/webpack#22770))

- Preserve string contents when extracting source map comments. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22768](webpack/webpack#22768))

- Scope strict-mode, async and generator block function declarations to their block. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22800](webpack/webpack#22800))

- Preserve raw dotenv values when reusing cached environment files. (by [@&#8203;Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#&#8203;22787](webpack/webpack#22787))

- Preserve assigned or patched built-ins, conversions and pattern targets. (by [@&#8203;aryanraj45](https://github.com/aryanraj45) in [#&#8203;22761](webpack/webpack#22761))

- Keep globals a `globalThis` write replaces, and `slice` on a patched array. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22862](webpack/webpack#22862))

- Skip HTML script tags for shared chunks that emit no JavaScript. (by [@&#8203;bjohansebas](https://github.com/bjohansebas) in [#&#8203;22779](webpack/webpack#22779))

- Keep the digits Firefox lays out a minified CSS percentage with. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22718](webpack/webpack#22718))

- Reject a second `srcset` descriptor after a `0x` density descriptor. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22741](webpack/webpack#22741))

- Minify JavaScript faster, folding string methods on constants and `x -= 1`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22823](webpack/webpack#22823))

- Shorten minified JavaScript, and keep it running like its source. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22717](webpack/webpack#22717))

- Drop more unused functions, arguments, calls, global reads and variable copies when minifying JavaScript. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22789](webpack/webpack#22789))

- Minify JavaScript smaller where swc does, and fold a function's `length` right. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22826](webpack/webpack#22826))

- Reduce JavaScript output size where oxc or swc produce smaller output. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22829](webpack/webpack#22829))

- Update watchpack to 2.6.3 and rebuild on a `node_modules` created mid-build. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22743](webpack/webpack#22743))

- Support `concatenateModules` with `cacheUnaffected`. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22746](webpack/webpack#22746))

- Update schema-utils to 4.8.1. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22774](webpack/webpack#22774))

- Keep CSS fallbacks, vendor overrides, `oklch()` hues and HTML elements. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22753](webpack/webpack#22753))

- Validate `CleanPlugin` and `DotenvPlugin` options with a precompiled check, so valid options no longer compile their schema at startup. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22758](webpack/webpack#22758))

- Speed up startup and CSS minification, sharing the compile cache with workers. (by [@&#8203;xiaoxiaojx](https://github.com/xiaoxiaojx) in [#&#8203;22706](webpack/webpack#22706))

- Use precise, generic types for modules, parsers, generators, stats and loaders. (by [@&#8203;alexander-akait](https://github.com/alexander-akait) in [#&#8203;22731](webpack/webpack#22731))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - "before 9am on tuesday"
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xNzUuMSIsInVwZGF0ZWRJblZlciI6IjQ0LjE3NS4xIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiLCJyZW5vdmF0ZSJdfQ==-->

Reviewed-on: https://code.futo.org/harbor/harbor/pulls/2035
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