chore: upgrade ESLint toolchain v9 → v10 (breaking change) #171
Description
Overview
Upgrade the full ESLint toolchain to their next major versions. All these packages must be upgraded together as they have tight peer dependencies:
| Package | Current | Target |
|---|---|---|
eslint |
^9.18.0 |
^10.x |
@eslint/js |
^9.18.0 |
^10.x |
@eslint/compat |
^1.2.5 |
^2.x |
eslint-config-eslint |
^11.0.0 |
^13.x |
eslint-plugin-svelte |
^2.36.0 |
^3.x |
svelte-eslint-parser |
^0.43.0 |
^1.x |
typescript-eslint |
^8.20.0 |
^8.56.x (minor) |
@typescript-eslint/eslint-plugin |
^8.20.0 |
^8.56.x (minor) |
@typescript-eslint/parser |
^8.20.0 |
^8.56.x (minor) |
eslint-config-prettier |
^10.0.1 |
^10.x (minor) |
eslint-plugin-prettier |
^5.2.2 |
^5.x (minor) |
globals |
^15.14.0 |
^17.x |
Breaking Changes
- ESLint v10 requires Node.js 20+
eslint-plugin-sveltev3 may have new rule names/config formatsvelte-eslint-parserv1 — major API changesglobalsv17 — some globals may be renamed/removed
Required Work
1. Update all packages together
npm install eslint@^10 @eslint/js@^10 @eslint/compat@^2 eslint-config-eslint@^13 eslint-plugin-svelte@^3 svelte-eslint-parser@^1 globals@^172. Update eslint.config.js
Review and update the flat config file for any breaking API changes.
3. Testing Checklist
-
npm run lintpasses with no errors - All existing lint rules still apply correctly
- Svelte files are linted correctly
- TypeScript files are linted correctly
- No unexpected rule regressions
Resources
Priority
Low — ESLint v9 is still actively supported.
Part of
Epic: Major dependency upgrades tracking issue