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fix(dotenv): preserve cached values before expansion - #22787

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alexander-akait merged 1 commit into
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Eshiv-Pandey:fix/dotenv-cache-expansion
Oct 19, 2026
Merged

alexander-akait merged 1 commit into
webpack:mainfrom
Eshiv-Pandey:fix/dotenv-cache-expansion

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@Eshiv-Pandey

@Eshiv-Pandey Eshiv-Pandey commented Oct 19, 2026 •

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Summary

Dotenv expansion mutates cached values, so rebuilds corrupt escaped dollars and retain old environment overrides. Expand a copy to keep the raw file values.

With an unchanged .env and the ambient base changing from first to second:

Second build Before After
Escaped $WEBPACK_DOTENV_CACHE_BASE second $WEBPACK_DOTENV_CACHE_BASE
${WEBPACK_DOTENV_CACHE_BASE}/api first/api second/api

What kind of change does this PR introduce?

fix

Did you add tests for your changes?

Yes. test/watchCases/plugins/dotenv-cached-expansion covers escaping and changed or removed overrides. It fails before the fix and passes afterward.

Local validation: all 11 lint stages, changeset validation and 106 focused tests passed. The earlier full run did not finish and last reported 21 test262 failures whose causes remain unverified. Full validation is left to CI.

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?

Added a patch changeset.

Use of AI

AI assistance was used to diagnose the cache mutation, draft the fix.

Summary by CodeRabbit

  • Bug Fixes
    • Corrected dotenv variable expansion when cached environment files are reused. Expanded values now reflect current environment overrides, escaped references remain literal, and removing an override restores the value from the environment file.

Signed-off-by: Eshiv-Pandey <194340770+Eshiv-Pandey@users.noreply.github.com>
@changeset-bot

changeset-bot Bot commented Oct 19, 2026

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🦋 Changeset detected

Latest commit: 8b4d9bc

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

@coderabbitai

coderabbitai Bot commented Oct 19, 2026 •

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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
  • Plan: Advanced
  • Run ID: 35e6c05e-0110-4bf0-9281-07714e032d84
📥 Commits

Reviewing files that changed from the base of the PR and between f9705a6 and 8b4d9bc.

📒 Files selected for processing: 8
  • .changeset/070-dotenv-cached-expansion.md
  • lib/define/DotenvPlugin.js
  • test/watchCases/plugins/dotenv-cached-expansion/0/.env
  • test/watchCases/plugins/dotenv-cached-expansion/0/index.js
  • test/watchCases/plugins/dotenv-cached-expansion/0/step.js
  • test/watchCases/plugins/dotenv-cached-expansion/1/step.js
  • test/watchCases/plugins/dotenv-cached-expansion/2/step.js
  • test/watchCases/plugins/dotenv-cached-expansion/webpack.config.js

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review.

📝 Walkthrough

The dotenv plugin now copies parsed environment values before expansion. A new watch case checks escaped references, expanded URLs, environment overrides, and fallback values across watch steps.

Changes: Dotenv cached expansion

Layer / File(s) Summary
Preserve parsed dotenv values
lib/define/DotenvPlugin.js, .changeset/070-dotenv-cached-expansion.md
_getEnv copies parsed values into a null-prototype object before expansion. The changeset records this as a patch update.
Verify expansion across watch steps
test/watchCases/plugins/dotenv-cached-expansion/*
The watch case changes or removes the base environment variable across steps. Assertions check expanded URLs, literal escaped references, and fallback values.

Suggested labels: area: watch

Suggested reviewers: alexander-akait

Priority: ⬇️ Low

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 8b4d9

The change is intended to preserve dotenv values across watch rebuilds, with focused regression coverage described in the supplied context. No actionable merge risk is established; normal CI validation remains appropriate.

Pre-merge checks: Passed 3 · Inconclusive 1

Failed Failed checks: 1 inconclusive

Check name Status Explanation Resolution
Title check Inconclusive The title uses valid Conventional Commit syntax, includes the allowed type fix, and accurately describes the dotenv cache fix. The branch prefix is not provided, so the required type-to-branch-prefi… Provide the branch name or confirm that its prefix is fix. If the prefix differs, update the title type to match it.
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 valid Conventional Commit syntax, includes the allowed type fix, and accurately describes the dotenv cache fix. The branch prefix 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 the prefix differs, update the title type to match it.

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

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@coderabbitai coderabbitai Bot added the area: watch Watching, HMR, lazy compilation (lib/hmr, hot/) label Oct 19, 2026
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Reported by Types Coverage #1751 for 8b4d9bc, computed by this pull request's own code.

Types Coverage

Coverage after merging fix/dotenv-cache-expansion into main will be
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Reported by Code Size #5117 for 8b4d9bc, computed by this pull request's own code.

Generated code size

Comparing base (f9705a6) to head (8b4d9bc). 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 — 9030 — — —

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: 2260 test(s), 9030 asset(s), 101 emitted nothing.

@codspeed

codspeed Bot commented Oct 19, 2026

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Merging this PR will degrade performance by 57.4%

⚠️ 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 regressed benchmarks
✅ 409 untouched benchmarks
⏩ 212 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Memory benchmark "html-many-chunks", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' 142.5 KB 761.3 KB -81.28%
❌ Memory unit benchmark "html-printer-document-unit", minify (document) 194.6 KB 326.6 KB -40.42%
❌ WallTime unit benchmark "css-printer-tailwind-unit", walk (dropped empty blocks) 23.2 ms 33.5 ms -30.68%

Tip

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


Comparing Eshiv-Pandey:fix/dotenv-cache-expansion (8b4d9bc) with main (f9705a6)

Open in CodSpeed

Footnotes

  1. 212 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 9ed3b7b into webpack:main Oct 19, 2026
64 of 65 checks passed
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This PR is packaged and the instant preview is available (9ed3b7b).

Install it locally:

  • npm
npm i -D webpack@https://pkg.pr.new/webpack@9ed3b7b
  • yarn
yarn add -D webpack@https://pkg.pr.new/webpack@9ed3b7b
  • pnpm
pnpm add -D webpack@https://pkg.pr.new/webpack@9ed3b7b

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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