chore: mark eslint peer dependency as optional

[dotnize]

see #6706

This is to consider other linters like Oxlint that can consume ESLint plugins directly, so ESLint doesn't have to be installed for these projects.

Would it be worth mentioning Oxlint as an additional supported linter in the docs?

UPDATE: see #6706 (reply in thread)

Summary by CodeRabbit

• Chores
  • Updated package configuration to mark ESLint as an optional peer dependency, allowing greater flexibility for users who may not require it.

[coderabbitai]

📝 Walkthrough

Walkthrough

The eslint peer dependency in the eslint-plugin-router package is marked as optional by adding a peerDependenciesMeta configuration block, allowing users to install the plugin without requiring eslint as a mandatory peer dependency.

Changes

Cohort / File(s)	Summary
Package Configuration packages/eslint-plugin-router/package.json	Added peerDependenciesMeta.eslint.optional set to true, marking eslint as an optional peer dependency while maintaining the existing peerDependencies entry.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A bunny's note on optional deps,
ESLint now wears freedom's step!
No longer bound by strict demands,
The plugin dances, free and unplanned,
A flexible friend for all the lands! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: mark eslint peer dependency as optional' accurately describes the main change: adding peerDependenciesMeta.eslint.optional to package.json.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit 3ce14d8

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	53s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	6s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-02-20 00:37:11 UTC

[pkg-pr-new]

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commit: 3ce14d8

[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

packages/eslint-plugin-router/package.json (1)

55-56: ⚠️ Potential issue | 🟠 Major

Transitive eslint peer dependency via @typescript-eslint/utils may still block ESLint-free installs

Marking the direct eslint peer dep as optional silences the warning at this package's level, but @typescript-eslint/utils@^8 (a hard dependency on line 55) itself declares eslint as a required peer dependency. The peer dependency chain is:

`@tanstack/eslint-plugin-router`
  └─ `@typescript-eslint/utils`@^8  (dependencies)
       └─ eslint  ← peer dependency (required, not optional)

@typescript-eslint/utils@8.23.0 declares eslint@^8.57.0 || ^9.0.0 as a peer dependency. This peer dependency is not optional.

In strict-mode pnpm (which this monorepo uses), the unsatisfied peer dependency from @typescript-eslint/utils will still generate warnings or install failures for consumers that don't have eslint installed. Making the direct peer dependency optional won't suppress those warnings or relax the requirement imposed by the transitive dependency.

Confirm that the target Oxlint integration installs cleanly without eslint before merging.

[dotnize]

#6706 (reply in thread)