pnpm run lint still runs ESLint 8.57.1, which npm now reports as unsupported on every install (WARN deprecated eslint@8.57.1: This version is no longer supported). The config is .eslintrc plus .eslintignore, and ESLint 9 removed both in favour of eslint.config.js.
That is why the Dependabot bump cannot land — #1302 fails CI with:
Oops! Something went wrong! :(
ESLint: 9.8.0
ESLint couldn't find an eslint.config.(js|mjs|cjs) file.
Why this is worth doing beyond the one stuck pull request
Staying on ESLint 8 silently freezes the plugins around it, because Dependabot can only offer versions whose peer ranges resolve:
eslint-plugin-unicorn is stuck at 56.0.1 while 72.0.0 is current. Recent releases peer eslint >=10.4, so no upgrade can even be proposed while ESLint is 8. This is not visible as a stale pull request — Dependabot simply stays silent.eslint-plugin-react@7.37.5 is already the latest release and peers ^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9.7. So ESLint 9 is the realistic target here; ESLint 10 stays out of reach until that plugin supports it.
Scope
Replace .eslintrc and .eslintignore with a single eslint.config.js, porting the existing extends, plugins, parser, env, rules and settings.
The shareable configs currently extended all ship flat-config variants at the versions already installed, so nothing needs upgrading first to start:
| extends |
flat equivalent available |
eslint:recommended |
@eslint/js → js.configs.recommended |
plugin:jest/recommended |
configs['flat/recommended'] |
plugin:unicorn/recommended |
configs['flat/recommended'] |
plugin:react/recommended |
configs.flat.recommended |
plugin:@typescript-eslint/recommended |
configs['flat/recommended'] |
plugin:prettier/recommended |
eslint-plugin-prettier/recommended |
@eslint/js is currently only present transitively and would need promoting to a direct devDependency.
env: {node, browser, es6} becomes languageOptions.globals, and the seven .eslintignore entries (examples/, dist/, node_modules/, coverage/, npm/, docs/, integration/) become an ignores block.
Done when
pnpm run lintstill runs ESLint 8.57.1, which npm now reports as unsupported on every install (WARN deprecated eslint@8.57.1: This version is no longer supported). The config is.eslintrcplus.eslintignore, and ESLint 9 removed both in favour ofeslint.config.js.That is why the Dependabot bump cannot land — #1302 fails CI with:
Why this is worth doing beyond the one stuck pull request
Staying on ESLint 8 silently freezes the plugins around it, because Dependabot can only offer versions whose peer ranges resolve:
eslint-plugin-unicornis stuck at 56.0.1 while 72.0.0 is current. Recent releases peereslint >=10.4, so no upgrade can even be proposed while ESLint is 8. This is not visible as a stale pull request — Dependabot simply stays silent.eslint-plugin-react@7.37.5is already the latest release and peers^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9.7. So ESLint 9 is the realistic target here; ESLint 10 stays out of reach until that plugin supports it.Scope
Replace
.eslintrcand.eslintignorewith a singleeslint.config.js, porting the existingextends,plugins,parser,env,rulesandsettings.The shareable configs currently extended all ship flat-config variants at the versions already installed, so nothing needs upgrading first to start:
eslint:recommended@eslint/js→js.configs.recommendedplugin:jest/recommendedconfigs['flat/recommended']plugin:unicorn/recommendedconfigs['flat/recommended']plugin:react/recommendedconfigs.flat.recommendedplugin:@typescript-eslint/recommendedconfigs['flat/recommended']plugin:prettier/recommendedeslint-plugin-prettier/recommended@eslint/jsis currently only present transitively and would need promoting to a direct devDependency.env: {node, browser, es6}becomeslanguageOptions.globals, and the seven.eslintignoreentries (examples/,dist/,node_modules/,coverage/,npm/,docs/,integration/) become anignoresblock.Done when
.eslintrcand.eslintignoreare gone, replaced byeslint.config.js.pnpm run lintandpnpm testpass on ESLint 9 with no new warnings, and the rule set is unchanged — the same violations are reported before and after.ignorerule for ESLint majors in.github/dependabot.ymlis removed (added in chore(ci): group every Dependabot update into one weekly pull request #1323 to stop the unmergeable bump blocking the weekly grouped update).