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MAINT: Bump eslint from 9.39.1 to 10.4.1 in /frontend#1850

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MAINT: Bump eslint from 9.39.1 to 10.4.1 in /frontend#1850
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@dependabot dependabot Bot commented on behalf of github May 29, 2026

Note

Augmented by maintainer (commit 93e58d1). Dependabot's original PR only bumped eslint, but ESLint 10 removed the FlatESLint API which broke @typescript-eslint/utils@8.46.4 with:

TypeError: Class extends value undefined is not a constructor or null
    at .../@typescript-eslint/utils/dist/ts-eslint/eslint/FlatESLint.js:12:49

The following companion changes were added so the lint gate passes:

Package Old New Reason
@typescript-eslint/eslint-plugin 8.46.4 8.60.0 First stable line with eslint ^10.0.0 in peer range
@typescript-eslint/parser 8.46.4 8.60.0 Same
@eslint/js 9.39.1 10.0.1 Match the new ESLint major

Also fixes a single no-useless-assignment violation in frontend/src/utils/messageMapper.ts (newly reported by @eslint/js@10's recommended config: the initial '' on base64Value was overwritten in every branch).

eslint-plugin-react-hooks was intentionally not bumped past 5.2.0 — its v7 release adds a set-state-in-effect rule that flags 13 pre-existing call sites, which is a real refactor unrelated to this dependency bump. The 5.2.0 plugin works fine against ESLint 10 in practice despite its outdated peer range.

Local verification: npm run lint, npm run type-check, and npm test (614 tests) all pass.


Bumps eslint from 9.39.1 to 10.4.1.

Release notes

Sourced from eslint's releases.

v10.4.1

Bug Fixes

  • e557467 fix: update @eslint/plugin-kit version to 0.7.2 (#20930) (Francesco Trotta)
  • d4ce898 fix: propagate failures from delegated commands (#20917) (Minh Vu)
  • f4f3507 fix: prefer-arrow-callback invalid autofix with newline after async (#20916) (kuldeep kumar)
  • c5bc78b fix: false positive for reference in finally block (#20655) (Tanuj Kanti)
  • 27538c0 fix: add missing CodePath and CodePathSegment types (#20853) (Pixel998)

Documentation

  • 61b0add docs: remove deprecated rule from related rules of max-params (#20921) (Tanuj Kanti)
  • 305d5b9 docs: remove deprecated rules from related rules section (#20911) (Tanuj Kanti)
  • 49b0202 docs: fix display: none of ad (#20901) (Tanuj Kanti)
  • 9067f94 docs: switch build to Node.js 24 (#20893) (Milos Djermanovic)
  • c91b041 docs: Update README (GitHub Actions Bot)
  • e349265 docs: clarify semver strings in rule deprecation objects (#20885) (Milos Djermanovic)

Chores

  • b0e466b test: add data property to invalid tests cases for rules (#20924) (Tanuj Kanti)
  • f78838b test: add CodePath type coverage (#20904) (Pixel998)
  • 1daa4bd chore: update eslint-plugin-eslint-comments test data to latest commit (#20922) (Francesco Trotta)
  • 002942c ci: declare contents:read on update-readme workflow (#20919) (Arpit Jain)
  • 64bca24 chore: update ecosystem plugins (#20912) (ESLint Bot)
  • 6d7c832 chore: ignore fflate updates in renovate (#20908) (Pixel998)
  • b2c8638 ci: bump pnpm/action-setup from 6.0.7 to 6.0.8 (#20889) (dependabot[bot])
  • a9b8d7f chore: increase maxBuffer for ecosystem tests (#20881) (sethamus)
  • b702ead chore: update ecosystem update PR settings (#20884) (Pixel998)
  • 507f60e chore: update ecosystem plugins (#20882) (ESLint Bot)
  • 92f5c5b test: add unit test for message-count (#20878) (kuldeep kumar)
  • df32108 chore: add @​eslint/markdown and typescript-eslint ecosystem tests (#20837) (sethamus)
  • 327f91d chore: use includeIgnoreFile internally (#20876) (Kirk Waiblinger)
  • f0dc4bd chore: pin fflate@0.8.2 (#20877) (Milos Djermanovic)
  • 0f4bd25 ci: run Discord alert for ecosystem test failures (#20873) (Copilot)

v10.4.0

Features

  • 1a45ec5 feat: check sequence expressions in for-direction (#20701) (kuldeep kumar)
  • 450040b feat: add includeIgnoreFile() to eslint/config (#20735) (Kirk Waiblinger)

Bug Fixes

  • 544c0c3 fix: escape code path DOT labels in debug output (#20866) (Pixel998)
  • 6799431 fix: update dependency @​eslint/config-helpers to ^0.6.0 (#20850) (renovate[bot])
  • f078fef fix: handle non-array deprecated rule replacements (#20825) (xbinaryx)

Documentation

  • 7e52a71 docs: add mention of @eslint-react/eslint-plugin (#20869) (Pavel)
  • db3468b docs: tweak wording around ambiguous CJS-vs-ESM config (#20865) (Kirk Waiblinger)
  • 9084664 docs: Update README (GitHub Actions Bot)
  • 9cc7387 docs: Update README (GitHub Actions Bot)
  • 3d7b548 docs: Update README (GitHub Actions Bot)
  • 191ec3c docs: Update README (GitHub Actions Bot)

... (truncated)

Commits
  • 4a3d15a 10.4.1
  • 43e7e2b Build: changelog update for 10.4.1
  • e557467 fix: update @eslint/plugin-kit version to 0.7.2 (#20930)
  • b0e466b test: add data property to invalid tests cases for rules (#20924)
  • d4ce898 fix: propagate failures from delegated commands (#20917)
  • f4f3507 fix: prefer-arrow-callback invalid autofix with newline after async (#20916)
  • f78838b test: add CodePath type coverage (#20904)
  • 61b0add docs: remove deprecated rule from related rules of max-params (#20921)
  • 1daa4bd chore: update eslint-plugin-eslint-comments test data to latest commit (#20...
  • 002942c ci: declare contents:read on update-readme workflow (#20919)
  • Additional commits viewable in compare view

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Bumps [eslint](https://github.com/eslint/eslint) from 9.39.1 to 10.4.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Commits](eslint/eslint@v9.39.1...v10.4.1)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 10.4.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file javascript Pull requests that update javascript code labels May 29, 2026
romanlutz and others added 3 commits May 29, 2026 20:56
…lity

ESLint 10 removed FlatESLint from its public API, which breaks @typescript-eslint/utils <8.57. Bump @typescript-eslint/eslint-plugin and parser to 8.60.0 (first stable line that lists eslint ^10.0.0 as a supported peer) and @eslint/js to 10.0.1 to match the new eslint major.

Also fix a no-useless-assignment violation newly reported by @eslint/js@10's recommended config in messageMapper.ts (the initial '' on base64Value was overwritten in every branch).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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made some updates to make this work

@romanlutz romanlutz enabled auto-merge May 30, 2026 21:19
@romanlutz romanlutz added this pull request to the merge queue May 30, 2026
@github-merge-queue github-merge-queue Bot removed this pull request from the merge queue due to a conflict with the base branch May 30, 2026
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