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chore: update webpack-dev-server to v6 and test against v5 and v6 by bjohansebas · Pull Request #4834 · webpack/webpack-cli · GitHub

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chore: update webpack-dev-server to v6 and test against v5 and v6 - #4834

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alexander-akait merged 2 commits into
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chore/webpack-dev-server-6
Aug 27, 2026
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chore: update webpack-dev-server to v6 and test against v5 and v6#4834
alexander-akait merged 2 commits into
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chore/webpack-dev-server-6

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bjohansebas commented Aug 22, 2026

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Summary

Updates the webpack-dev-server dev dependency to v6 and makes the test suite cover both v5 and v6, which are the versions the webpack-cli peer range allows (^5.0.0 || ^6.0.0).

  • Snapshots for dev-server 6 are added next to the existing v5 ones. The snapshot resolver already supports this through the .snap.devServer<major>.webpack<major> extension, so no tooling change was needed. The only difference in the output is the help text for --server-type, since v6 drops spdy from the possible values.
  • CI runs the matrix against dev-server-version: [5, latest], installing v5 with npm install ... --no-save --ignore-scripts for that job, following the same approach as chore: use plugin support #4791.
  • webpack-dev-server v6 is ESM and exposes the server as its default export, while v5 exports it directly, so tsc failed with "This expression is not constructable". The CLI now resolves the constructor type from the default export when there is one, which type-checks against both versions. Runtime behavior is unchanged: the package was already loaded through (await import(pkg)).default.

What kind of change does this PR introduce?

chore, plus a types fix in webpack-cli.

Did you add tests for your changes?

No new tests, the existing test/help and test/serve suites now run against both dev-server versions with their own snapshots.

Does this PR introduce a breaking change?

No. The peer range already allowed v6, and the type change only affects how the constructor type is resolved.

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

SERVE-OPTIONS-v6.md will be generated by the scheduled "Update documentation" workflow, which derives the filename from the installed dev-server major.

Use of AI

Yes. I used Claude Code (Opus) to carry out the upgrade under my direction: the dependency bump, the type fix, the CI matrix and the snapshots. I verified the build and ran test/help against the new snapshots locally, and reviewed the final diff.

changeset-bot Bot commented Aug 22, 2026 •
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🦋 Changeset detected

Latest commit: 748cbee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
Name Type
webpack-cli 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

socket-security Bot commented Aug 22, 2026 •
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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security		 Vulnerability Quality Maintenance License
webpack-dev-server@​5.2.5 ⏵ 6.0.0 +1 +3 +2

View full report

github-actions Bot commented Aug 22, 2026 •
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This PR is packaged and the instant preview is available (3664b9d).

Install it locally:

  • npm
npm i -D webpack-cli@https://pkg.pr.new/webpack-cli@3664b9d
  • yarn
yarn add -D webpack-cli@https://pkg.pr.new/webpack-cli@3664b9d
  • pnpm
pnpm add -D webpack-cli@https://pkg.pr.new/webpack-cli@3664b9d

codecov Bot commented Aug 22, 2026 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.32%. Comparing base (ce1a219) to head (748cbee).

Additional details and impacted files 

@@           Coverage Diff           @@
##             main    #4834   +/-   ##
=======================================
  Coverage   93.32%   93.32%           
=======================================
  Files          14       14           
  Lines        5466     5472    +6     
  Branches      793      793           
=======================================
+ Hits         5101     5107    +6     
  Misses        363      363           
  Partials        2        2
Files with missing lines Coverage Δ
packages/webpack-cli/src/webpack-cli.ts 96.75% <100.00%> (+<0.01%) ⬆️

Continue to review full report in Codecov by Harness.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ce1a219...748cbee. Read the comment docs.

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chore: update webpack-dev-server to v6 and test against v5 and v6
946aeb0 
Bump the dev dependency to `webpack-dev-server@6` and add snapshots for it,
which the snapshot resolver already supports through the
`.snap.devServer<major>.webpack<major>` extension. CI now runs the test matrix
against both v5 and v6, installing v5 with npm for that job.

`webpack-dev-server` v6 is ESM and exposes the server as its `default` export,
while v5 exports it directly, so the CLI now resolves the constructor type from
the default export when there is one. Runtime behavior is unchanged, the package
was already loaded through `(await import(pkg)).default`.
bjohansebas force-pushed the chore/webpack-dev-server-6 branch from 6cf3728 to 946aeb0 Compare August 22, 2026 21:16

evenstensberg commented Aug 26, 2026

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@bjohansebas could you rebase against main, so we can see the node v26 workflows in this pr?

alexander-akait merged commit 3664b9d into main Aug 27, 2026
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alexander-akait deleted the chore/webpack-dev-server-6 branch August 27, 2026 12:04
github-actions Bot mentioned this pull request Aug 28, 2026
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claude Bot mentioned this pull request Sep 1, 2026
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alexander-akait alexander-akait approved these changes
evenstensberg evenstensberg approved these changes
avivkeller avivkeller approved these changes

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