Migrate to ESLint 9

.prettierrc.json

@@ -0,0 +1,5 @@
+{
+  "singleQuote": true,
+  "bracketSpacing": false,
+  "trailingComma": "none"
+}

CHANGELOG.md

@@ -1,112 +1,141 @@
 # CHANGELOG
 
+## 8.0.0
+
+### Features
+
+- ESLint 9 compatibility.
+- Upgraded all plugins.
+- Add `noImplicitOverride` to TypeScript config (recommended by Matt Pocock).
+- [`eslint-import-resolver-typescript`](https://www.npmjs.com/package/eslint-import-resolver-typescript) is now used for TypeScript files to configure `eslint-plugin-import` correctly. This now correctly takes into consideration [`paths`](https://www.typescriptlang.org/tsconfig#paths) from `tsconfig.json` when determining ordering of imports.
+- New rules from [`eslint-plugin-unicorn`](https://www.npmjs.com/package/eslint-plugin-unicorn):
+  - `unicorn/prefer-array-index-of`
+  - `unicorn/prefer-optional-catch-binding`
+  - `unicorn/no-useless-spread`
+- New rules from [`@typescript-eslint`](https://www.npmjs.com/package/@typescript-eslint):
+  - `@typescript-eslint/prefer-optional-chain`
+  - `@typescript-eslint/no-unnecessary-condition`
+- New rules from [`eslint-plugin-import`](https://www.npmjs.com/package/eslint-plugin-import):
+  - `import/no-useless-path-segments`
+- Apply TypeScript-specific rules also to `.mts`, `.mtsx`, `.cts` and `.ctsx` files.
+- Add [`eslint-plugin-unused-imports`](https://www.npmjs.com/package/eslint-plugin-unused-imports) to remove unused imports during autofix.
+- Add vitest rules.
+
+### Breaking changes
+
+- ESLint 9 is now required (see updated README)
+- The ESLint config is intended to be consumed via ESM (e.g. by using `eslint.config.mjs`)
+- Prettier no longer runs via an integrated rule since this is [discouraged](https://prettier.io/docs/en/integrating-with-linters#notes). Instead, a supplemental Prettier config is now provided (see updated README). To enable prettier checking on CI, you might want to consider adding `prettier --check` to your CI pipeline.
+- The `valid-jsdoc` rule has been removed since it was removed from ESLint core and is only available via an additional plugin. If you'd like to keep this rule, add [`eslint-plugin-jsdoc`](https://www.npmjs.com/package/eslint-plugin-jsdoc) to your project.
+- Globals for Cypress are no longer provided out of the box, but should be added explicitly by projects (see [predefined global variables](https://eslint.org/docs/latest/use/configure/language-options#predefined-global-variables)).
+
 ## 7.0.0
 
 ### Features
 
- - Enable `react/function-component-definition` to have auto fix for using functions of React components (fixes #75)
- - Enable `react/no-unstable-nested-components` (fixes #77)
- - Enable `{checksVoidReturn: {attributes: false}}` for `@typescript-eslint/no-misused-promises` (fixes #86)
- - Enable `@typescript-eslint/ban-ts-comment` (fixes #89)
- - Upgrade available major versions of dependencies (`@typescript-eslint/eslint-plugin`)
- - Add `molindo/tailwind`
+- Enable `react/function-component-definition` to have auto fix for using functions of React components (fixes #75)
+- Enable `react/no-unstable-nested-components` (fixes #77)
+- Enable `{checksVoidReturn: {attributes: false}}` for `@typescript-eslint/no-misused-promises` (fixes #86)
+- Enable `@typescript-eslint/ban-ts-comment` (fixes #89)
+- Upgrade available major versions of dependencies (`@typescript-eslint/eslint-plugin`)
+- Add `molindo/tailwind`
 
 ### Fixes
 
- - Detect `**/*.{e2e,cy}.{js,jsx,ts,tsx}` as test files (fixes #67)
- - Change `import/no-extraneous-dependencies` rule configuration to allow dev dependencies in all files since it has too many false positives otherwise (fixes #71)
- - Add `cy` and `Cypress` globals when `cypress` config is used (fixes #79)
- - Disable `no-use-before-define` for TypeScript files (fixes #91)
+- Detect `**/*.{e2e,cy}.{js,jsx,ts,tsx}` as test files (fixes #67)
+- Change `import/no-extraneous-dependencies` rule configuration to allow dev dependencies in all files since it has too many false positives otherwise (fixes #71)
+- Add `cy` and `Cypress` globals when `cypress` config is used (fixes #79)
+- Disable `no-use-before-define` for TypeScript files (fixes #91)
 
 ### Breaking changes
 
- - Require `eslint@^8.45`
- - `eslint-config-molindo/setupPlugins` has been removed, since it's no longer necessary (fixes #59)
- - Removed `typescript` from dependencies (consumers should install this)
- - CSS modules-related rules were moved to `molindo/css-modules`
- - Upstream breaking changes
-    1. [`@typescript-eslint/eslint-plugin` & `@typescript-eslint/eslint-plugin`](https://github.com/typescript-eslint/typescript-eslint/blob/main/CHANGELOG.md#breaking-changes)
-    2. [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest/blob/main/CHANGELOG.md#2700-2022-08-28)
-    3. [`prettier`](https://prettier.io/blog/2023/07/05/3.0.0.html)
-    4. [`eslint-plugin-prettier`](https://github.com/prettier/eslint-plugin-prettier/blob/master/CHANGELOG.md#500)
-    5. [`eslint-plugin-unicorn`](https://github.com/sindresorhus/eslint-plugin-unicorn/releases) (upgraded from v41 to v48)
+- Require `eslint@^8.45`
+- `eslint-config-molindo/setupPlugins` has been removed, since it's no longer necessary (fixes #59)
+- Removed `typescript` from dependencies (consumers should install this)
+- CSS modules-related rules were moved to `molindo/css-modules`
+- Upstream breaking changes
+  1. [`@typescript-eslint/eslint-plugin` & `@typescript-eslint/eslint-plugin`](https://github.com/typescript-eslint/typescript-eslint/blob/main/CHANGELOG.md#breaking-changes)
+  2. [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest/blob/main/CHANGELOG.md#2700-2022-08-28)
+  3. [`prettier`](https://prettier.io/blog/2023/07/05/3.0.0.html)
+  4. [`eslint-plugin-prettier`](https://github.com/prettier/eslint-plugin-prettier/blob/master/CHANGELOG.md#500)
+  5. [`eslint-plugin-unicorn`](https://github.com/sindresorhus/eslint-plugin-unicorn/releases) (upgraded from v41 to v48)
 
 ## 6.0.1
 
 ### Fixes
 
- - Add locale for `react/jsx-sort-props` ([#94](https://github.com/molindo/eslint-config-molindo/pull/94) by [@googol7](https://github.com/googol7))
+- Add locale for `react/jsx-sort-props` ([#94](https://github.com/molindo/eslint-config-molindo/pull/94) by [@googol7](https://github.com/googol7))
 
 ## 6.0.0
 
 ### Features
 
- - Upgrade to TypeScript 4
+- Upgrade to TypeScript 4
 
 ### Fixes
 
- - Disable TypeScript rules which cause false positives.
- - Disallow `describe.only`.
+- Disable TypeScript rules which cause false positives.
+- Disallow `describe.only`.
 
 ### Breaking changes
 
- - Requires ESLint 8
+- Requires ESLint 8
 
 ## 5.1.1
 
 ### Fixes
 
- - Add `allowFunctions` to `react/jsx-no-bind` rule.
+- Add `allowFunctions` to `react/jsx-no-bind` rule.
 
 ## 5.1.0
 
 ### Features
 
- - Add `jest` config
- - Add `cypress` config
- - Add `no-useless-rename`
- - Add `spaced-comment`
+- Add `jest` config
+- Add `cypress` config
+- Add `no-useless-rename`
+- Add `spaced-comment`
 
 ### Fixes
 
- - Avoid errors in JavaScript files in TypeScript projects
- - Disable `react/react-in-jsx-scope`
+- Avoid errors in JavaScript files in TypeScript projects
+- Disable `react/react-in-jsx-scope`
 
 ## 5.0.2
 
 ### Fixes
 
- - Compatibility with ESLint 7.23.0
+- Compatibility with ESLint 7.23.0
 
 ## 5.0.0
 
 ### Features
 
- - TypeScript support.
- - Remove peer dependencies in favour of actual dependencies.
- - Add automatic version detection for React.
- - Allow more recent versions of dependencies.
- - Warn about [confusing browser globals](https://www.npmjs.com/package/confusing-browser-globals) when accessing them without `window`.
- - Sort desctructured keys when using the React config (useful for destructured props to match the prop type definition).
- - Add useful rules from [eslint-plugin-unicorn](https://github.com/sindresorhus/eslint-plugin-unicorn): `unicorn/explicit-length-check`, `unicorn/import-index`, `unicorn/no-abusive-eslint-disable`
- - Imports are alphabetized (within individual groups: dependencies, internal, local, etc.).
- - Validate that array methods like `map` and `filter` return something.
- - Improve React component method sorting if you're using classes.
- - Add `react/button-has-type`.
+- TypeScript support.
+- Remove peer dependencies in favour of actual dependencies.
+- Add automatic version detection for React.
+- Allow more recent versions of dependencies.
+- Warn about [confusing browser globals](https://www.npmjs.com/package/confusing-browser-globals) when accessing them without `window`.
+- Sort desctructured keys when using the React config (useful for destructured props to match the prop type definition).
+- Add useful rules from [eslint-plugin-unicorn](https://github.com/sindresorhus/eslint-plugin-unicorn): `unicorn/explicit-length-check`, `unicorn/import-index`, `unicorn/no-abusive-eslint-disable`
+- Imports are alphabetized (within individual groups: dependencies, internal, local, etc.).
+- Validate that array methods like `map` and `filter` return something.
+- Improve React component method sorting if you're using classes.
+- Add `react/button-has-type`.
 
 ### Fixes
 
- - Removed `no-lonely-if` since there are valid cases for this pattern.
- - Keep `trailingComma: 'none'` for newer prettier versions.
- - Keep auto fix behaviour of `react-hooks/exhaustive-deps` in more recent versions.
- - Replace `jsx-a11y/label-has-for` with `jsx-a11y/label-has-associated-control`.
- - Allow for/of statements as there are valid use cases.
+- Removed `no-lonely-if` since there are valid cases for this pattern.
+- Keep `trailingComma: 'none'` for newer prettier versions.
+- Keep auto fix behaviour of `react-hooks/exhaustive-deps` in more recent versions.
+- Replace `jsx-a11y/label-has-for` with `jsx-a11y/label-has-associated-control`.
+- Allow for/of statements as there are valid use cases.
 
 ### Breaking changes
 
- - The base JavaScript config `molindo` has been renamed to `molindo/javascript`.
- - The base JavaScript config is no longer included in the React config. Use `"extends": ["molindo/javascript", "molindo/react"]` to use both.
- - Require a minimum version of Node.js 10.
- - Use `eslint@^7.0.0`.
- - A declaration style is now enforced for functions. Since there's no auto fix, it's probably the best option to override this rule in existing code bases which use a different style extensively.
- - This config now installs the relevant plugins automatically. However you have to use the JavaScript version of the ESLint config (`.eslintrc.js`) and add `require('eslint-config-molindo/setupPlugins')` there. Alternatively you can still install all necessary plugins yourself.
+- The base JavaScript config `molindo` has been renamed to `molindo/javascript`.
+- The base JavaScript config is no longer included in the React config. Use `"extends": ["molindo/javascript", "molindo/react"]` to use both.
+- Require a minimum version of Node.js 10.
+- Use `eslint@^7.0.0`.
+- A declaration style is now enforced for functions. Since there's no auto fix, it's probably the best option to override this rule in existing code bases which use a different style extensively.
+- This config now installs the relevant plugins automatically. However you have to use the JavaScript version of the ESLint config (`.eslintrc.js`) and add `require('eslint-config-molindo/setupPlugins')` there. Alternatively you can still install all necessary plugins yourself.

README.md

@@ -6,54 +6,103 @@
 2. Make reading code easier by providing consistent code style.
 3. Make writing code faster by leveraging auto fix wherever possible.
 
-## Usage
+## Getting started
 
-1. `yarn add eslint eslint-config-molindo --dev`
-2. Setup your project config in `.eslintrc.js`:
+1. `yarn add eslint eslint-config-molindo prettier --dev`
+2. Setup your project config in `eslint.config.mjs`:
 
 ```js
-module.exports = {
-  // Add configs based on your needs
-  extends: [
-    'molindo/typescript', // Or `molindo/javascript`
-
-    'molindo/react', // Optional
-    'molindo/css-modules', // Optional
-    'molindo/tailwind', // Optional
-    'molindo/jest', // Optional
-    'molindo/cypress' // Optional
-  ]
-}
+// @ts-check
+
+import {getPresets} from 'eslint-config-molindo';
+
+export default [
+  ...(await getPresets(
+    // Base config
+    'typescript', // or 'javascript'
+
+    // Optional extensions
+    'react',
+    'cssModules',
+    'tailwind',
+    'jest',
+    'cypress',
+    'vitest'
+  )),
+
+  {
+    // Your custom config
+  }
+];
 ```
 
-3. If you use TypeScript, add `"extends": "eslint-config-molindo/tsconfig.json"` to your `tsconfig.json`.
-4. Happy linting!
+3. If you require [globals](https://eslint.org/docs/latest/use/configure/language-options#predefined-global-variables), like browser APIs on `window`, you can add them to your config:
+
+```js
+// eslint.config.mjs
+import globals from 'globals';
+
+export default [
+  // ...
+  {
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      }
+    }
+  }
+];
+```
+
+4. To set up Prettier, add to your `package.json`:
+
+```json
+"prettier": "eslint-config-molindo/.prettierrc.json"
+```
+
+5. If you use TypeScript, add to your `tsconfig.json`:
+
+```json
+"extends": "eslint-config-molindo/tsconfig.json"
+```
+
+Happy linting!
 
 ## Further configuration
 
-### Environment
+### CI integration
 
-Set the [`env` in `.eslintrc`](https://eslint.org/docs/user-guide/configuring#specifying-environments) as necessary so ESLint doesn't report missing globals.
-
-E.g.:
+To validate your code in a CI pipeline, add the following to your `package.json`:
 
 ```json
-{
-  "browser": true,
-  "node": true,
-  "es6": true,
-  "jest": true
+"scripts": {
+  "lint": "eslint src && prettier src --check"
 }
 ```
 
-### Editor integration
+### VSCode integration
 
-It's strongly recommended to use an eslint integration for your editor of choice (e. g. [`dbaeumer.vscode-eslint`](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) for [VSCode](https://code.visualstudio.com/) so you see warnings and errors while writing code. Also the setting to auto fix errors on save should be turned on, so purely stylistic errors such as the ones reported by `prettier` are fixed automatically.
+The following two extensions are recommended:
 
-If your linter plugin checks your code as you type (before you save) it can be helpful to silence stylistic errors to reduce noise and let the formatting happen on save.
+1. [`dbaeumer.vscode-eslint`](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint)
+2. [`esbenp.prettier-vscode`](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode)
+
+To auto-fix errors from ESLint as well as Prettier on save, you can use the following configuration:
+
+```js
+// settings.json (VSCode)
+{
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": "always"
+  },
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "editor.formatOnSave": true
+}
+```
 
 ## Versioning
 
- - Patch releases are for improved documentation, fixing a rule to stop reporting false positives and internal code changes.
- - Minor releases are for changes to rules that can automatically be fixed.
- - Major releases happen when rules are changed that can't be fixed automatically.
+- Patch releases are for improved documentation, fixing a rule to stop reporting false positives and internal code changes.
+- Minor releases are for changes to rules that can automatically be fixed.
+- Major releases happen when rules are changed that can't be fixed automatically.