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Previously, the `recommended` config used the legacy ESLint format (plugins as an array of strings). This causes errors when used with ESLint v9's `defineConfig()` helper. This was following [eslint's own docs](https://eslint.org/docs/latest/extend/plugins#backwards-compatibility-for-legacy-configs): > With this approach, both configuration systems recognize "recommended". The old config system uses the recommended key while the current config system uses the flat/recommended key. The defineConfig() helper first looks at the recommended key, and if that is not in the correct format, it looks for the flat/recommended key. This allows you an upgrade path if you’d later like to rename flat/recommended to recommended when you no longer need to support the old config system. However, [`isLegacyConfig()`](https://github.com/eslint/rewrite/blob/main/packages/config-helpers/src/define-config.js#L73-L81) (also see [`eslintrcKeys`](https://github.com/eslint/rewrite/blob/main/packages/config-helpers/src/define-config.js#L24-L35)) function doesn't check for the `plugins` key, so our config was incorrectly treated as flat config despite being in legacy format. This PR fixes the issue, along with a few other fixes combined: 1. Convert `recommended` to flat config format 2. Separate basic rules (exhaustive-deps, rules-of-hooks) from compiler rules 3. Add `recommended-latest-legacy` config for non-flat config users who want all recommended rules (including compiler rules) 4. Adding more types for the exported config Our shipped presets in 6.x.x will essentially be: - `recommended-legacy`: legacy (non-flat), with basic rules only - `recommended-latest-legacy`: legacy (non-flat), all rules (basic + compiler) - `flat/recommended`: flat, basic rules only (now the same as recommended, but to avoid making a breaking change we'll just keep it around in 6.x.x) - `recommended-latest`: flat, all rules (basic + compiler) - `recommended`: flat, basic rules only In the next breaking release 7.x.x, we will collapse down the presets into three: - `recommended-legacy`: all recommended rules - `recommended`: all recommended rules - `recommended-experimental`: all recommended rules + new bleeding edge experimental rules Closes #34679 --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34700). * #34703 * __->__ #34700
ESLint v8 Fixture
This fixture allows us to test e2e functionality for eslint-plugin-react-hooks with eslint version 8.
Run the following to test.
cd fixtures/eslint-v8
yarn
yarn build
yarn lint