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perf: validate CleanPlugin and DotenvPlugin options with a precompiled check - #22758

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alexander-akait merged 2 commits into
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perf/clean-dotenv-precompiled-check
Oct 18, 2026
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alexander-akait merged 2 commits into
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perf/clean-dotenv-precompiled-check

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@alexander-akait

@alexander-akait alexander-akait commented Oct 18, 2026 •

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Summary

CleanPlugin and DotenvPlugin were the only plugins in lib/ that still called compiler.validate without a precompiled check. Without one, valid options compile their schema with ajv on every start.

They now follow the same pattern as the asset and CSS options:

  • schemas/plugins/output/CleanOptions.json and schemas/plugins/define/DotenvPluginOptions.json are $refs to the WebpackOptions.json definitions. They're published with @publishes tags in declarations/WebpackOptions.ts.
  • tooling/precompile-schemas.js compiles them to .check.js.
  • Each plugin passes its check as the 4th argument of compiler.validate. Invalid options still get the full schema validation, with the same error messages.

Measurements

Running the plugin's validate hook in a fresh Node 22 process, median of 7:

Before After
CleanPlugin({ dry: true }) 19.9 ms 1.5 ms
DotenvPlugin({ prefix: ["APP_"] }) 14.1 ms 1.8 ms

Tests

  • A parity script compared each check with full schema validation on valid and invalid values. They agree on every value except [] for CleanOptions. The check rejects it, which is correct for type: "object", and webpack then falls back to full validation. In no case does the check accept something the schema rejects.
  • Invalid options still throw Invalid options object. Clean Plugin… and …Dotenv Plugin… as before.
  • The clean and dotenv config cases pass (99), and so do ESLint, Prettier, the changeset validation and tsc -p tsconfig.types.json.

Generated by Claude Code

Summary by CodeRabbit

  • Performance
    • Clean and Dotenv plugin options continue to be validated, with less work required during startup. This may improve startup performance while preserving configuration checks.

…d check

Both plugins were the only ones in lib/ still calling compiler.validate
without a check, so valid options compiled their schema with ajv on every
start. The schemas are published from their WebpackOptions definitions
and compiled by tooling/precompile-schemas.js like the others.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QYPkbvwyRWt2SHgXDoYRdo
@changeset-bot

changeset-bot Bot commented Oct 18, 2026 •

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🦋 Changeset detected

Latest commit: 609989c

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 Oct 18, 2026 •

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Review in Change Stack →

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration
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📥 Commits

Reviewing files that changed from the base of the PR and between f5901e6 and 609989c.

📒 Files selected for processing: 3
  • test/configCases/clean/plugin-instance/index.js
  • test/configCases/clean/plugin-instance/webpack.config.js
  • test/configCases/plugins/dotenv-plugin/webpack.config.js

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review.

📝 Walkthrough

CleanPlugin and DotenvPlugin pass their options to schema checkers during validation. Their option schemas reference definitions in WebpackOptions.json. Configuration cases instantiate both plugins. A patch changeset describes the precompiled checks.

Changes: Plugin option validation

Layer / File(s) Summary
Schema references and plugin validation
schemas/plugins/output/CleanOptions.json, schemas/plugins/define/DotenvPluginOptions.json, lib/output/CleanPlugin.js, lib/define/DotenvPlugin.js, .changeset/300-clean-dotenv-options-check.md
The option schemas reference definitions in WebpackOptions.json. CleanPlugin and DotenvPlugin pass their options to the corresponding checkers during validation. The changeset describes these checks as precompiled.
Plugin instance configuration cases
test/configCases/clean/plugin-instance/*, test/configCases/plugins/dotenv-plugin/webpack.config.js
Configuration cases instantiate CleanPlugin with dry: true and a /keep/ pattern, and DotenvPlugin with the WEBPACK_ prefix. The CleanPlugin test callback is empty.

Suggested labels: area: config, area: types, area: build-perf

Priority: ➖ Normal

Change: Refactor

Merge Risk: ⚪ Minimal · up to 60998

The added plugin-instance case exercises option validation, and no specific behavior regression is established as a merge blocker.

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 with the allowed type perf and clearly describes the main change. The branch prefix is not provided, so the required type-prefix match cannot b… Provide the branch name or confirm that its prefix is perf. Then verify that the title type matches that prefix.
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 with the allowed type perf and clearly describes the main change. The branch prefix is not provided, so the required type-prefix match cannot be verified.

Resolution

Provide the branch name or confirm that its prefix is perf. Then verify that the title type matches that prefix.

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

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@coderabbitai coderabbitai Bot added area: config Options, defaults, validation (lib/config, schemas/) area: types types.d.ts, JSDoc annotations, hand-maintained declarations needs: tests Fix or PR exists but lacks the required tests labels Oct 18, 2026
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This PR is packaged and the instant preview is available (32aca11).

Install it locally:

  • npm
npm i -D webpack@https://pkg.pr.new/webpack@32aca11
  • yarn
yarn add -D webpack@https://pkg.pr.new/webpack@32aca11
  • pnpm
pnpm add -D webpack@https://pkg.pr.new/webpack@32aca11

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Types Coverage

Coverage after merging perf/clean-dotenv-precompiled-check into main will be
99.24%
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Generated code size

Comparing base (e1c10dc) to head (609989c). Merging this pull request adds 2 new asset(s).

What moved Tests Assets Gzip Raw Test edit
Changed, test untouched 0 0 — — —
Changed, test edited 0 0 — — —
New 2 2 ⚪ added +785 B ⚪ added +1.56 KiB —
Deleted 0 0 — — —
Unchanged — 8988 — — —

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 that both runs emit changed size — everything below is new or deleted.

2 asset(s) this pull request adds
Asset Raw Gzip (9) Brotli (11) Zstd (19)
⚪ added plugins/dotenv-plugin plugin-instance/bundle7.js 1.51 KiB 714 B 558 B 719 B
⚪ added clean/plugin-instance bundle0.js 51 B 71 B 48 B 60 B

No runtime gained or lost a runtime module.

Built test/configCases with the defaults a user gets: 2256 test(s), 8990 asset(s), 101 emitted nothing.

@codspeed

codspeed Bot commented Oct 18, 2026 •

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Merging this PR will regress 1 benchmark

⚠️ 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 28 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

⚡ 4 improved benchmarks
❌ 1 regressed benchmark
✅ 401 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 284.4 KB -46.95%
⚡ Memory unit benchmark "html-printer-document-unit", minify (composed subtrees) 666.2 KB 279.1 KB ×2.4
⚡ Memory unit benchmark "js-parser-unit", sourceType 'module' 1,125 KB 635.8 KB +76.93%
⚡ Memory benchmark "asset-modules-bytes", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 236.8 KB 189.4 KB +25.04%
⚡ Memory unit benchmark "css-printer-tailwind-unit", walk (deep nesting) 3.6 KB 2.9 KB +21.81%

Tip

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


Comparing perf/clean-dotenv-precompiled-check (609989c) with main (e1c10dc)

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. ↩

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codecov Bot commented Oct 18, 2026 •

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.49%. Comparing base (e1c10dc) to head (609989c).

Additional details and impacted files
@@           Coverage Diff           @@
##             main   #22758   +/-   ##
=======================================
  Coverage   96.48%   96.49%           
=======================================
  Files         778      778           
  Lines      137320   137322    +2     
  Branches    46550    46550           
=======================================
+ Hits       132488   132503   +15     
+ Misses       4832     4819   -13     
Flag Coverage Δ
css-parsing 24.76% <ø> (ø)
html5lib 26.55% <ø> (ø)
integration 81.30% <100.00%> (+0.01%) ⬆️
minify-corpora 90.86% <ø> (ø)
syntax-equivalence 76.57% <ø> (ø)
test262 55.78% <ø> (ø)
test262-parser 79.42% <ø> (ø)
unit 76.52% <ø> (-0.01%) ⬇️
xmlconf 27.52% <ø> (ø)

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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`output.clean` and `dotenv` apply their plugins after the validate hook
has fired, so only a plugin instance in `plugins` validates its own
options. No case did that, which left the precompiled checks uncovered.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QYPkbvwyRWt2SHgXDoYRdo
@coderabbitai coderabbitai Bot added area: build-perf Build time and memory of webpack itself and removed needs: tests Fix or PR exists but lacks the required tests labels Oct 18, 2026
@alexander-akait
alexander-akait merged commit 32aca11 into main Oct 18, 2026
69 checks passed
@alexander-akait
alexander-akait deleted the perf/clean-dotenv-precompiled-check branch October 18, 2026 20:53
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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