feat: update ESLint to v9 (#30)

BREAKING CHANGE: due to the upgrade of various ESLint plugins, the minimum supported version
TypeScript and Node.js has been increased. This should not affect most users, but if you are using
an older version of TypeScript or Node.js, you may need to upgrade.
Furthermore some of the dependencies have been updated to their latest versions, which may cause
some checks to fail.

.github/workflows/main.yml

@@ -13,6 +13,13 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22.x'
+      - run: npm install
+      - run: npm run build
       - name: Semantic Release
         uses: cycjimmy/semantic-release-action@v4
         with:

.gitignore

@@ -5,60 +5,20 @@ npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 
-# Runtime data
-pids
-*.pid
-*.seed
-*.pid.lock
-
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-
-# nyc test coverage
-.nyc_output
-
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (https://nodejs.org/api/addons.html)
-build/Release
-
 # Dependency directories
 node_modules/
-jspm_packages/
-
-# TypeScript v1 declaration files
-typings/
 
 # Optional npm cache directory
 .npm
 
 # Optional eslint cache
 .eslintcache
 
-# Optional REPL history
-.node_repl_history
-
-# Output of 'npm pack'
-*.tgz
-
-# Yarn Integrity file
-.yarn-integrity
-
-# dotenv environment variables file
-.env
-
 # next.js build output
 .next
 
 # NPM lock file
 package-lock.json
+
+# Distribution directory
+dist

README.md

@@ -10,24 +10,28 @@ $ npm install eslint @smartive/eslint-config -D
 
 ## Usage
 
-Create a `.eslintrc` file in the root of your project's directory (it should live where `package.json` does). This package offers two different rulesets, on for plain TypeScript applications (`@smartive/eslint-config`) and a separate one for React applications (`@smartive/eslint-config`). Your `.eslintrc` file should look like this:
+This package offers two different rule sets, one for plain TypeScript applications and a separate one for React applications.
 
-### Plain TypeScript applications
+### Flat Config (`eslint.config.mjs`)
 
-```
-{
-  "extends": [
-    "@smartive/eslint-config"
-  ]
-}
-```
+```javascript
+import { configs } from '@smartive/eslint-config'
 
-### React applications
+// For plain TS applications ..
+export default configs.typescript;
 
+// .. or React applications
+export default configs.react;
 ```
+
+### Legacy Config (`.eslintrc`)
+
+```json
 {
   "extends": [
-    "@smartive/eslint-config/react"
+    "@smartive/eslint-config/typescript-legacy" // Plain TS applications
+    // or
+    "@smartive/eslint-config/react-legacy"      // React applications
   ]
 }
 ```
@@ -42,7 +46,3 @@ To use eslint add the following to your package.json:
   "lint:fix": "eslint . --fix"
 }
 ```
-
-### TypeScript configuration
-
-Since there are some rules which require type information please make sure to set up a `tsconfig.json` configuration file in the root directory of your project. If your TypeScript configuration file is placed in another location you have to configure it using `parserOptions.project` in your ESLint configuration file. For more information have a look at the [typescript-eslint documentation](https://typescript-eslint.io/packages/parser/#project).

package.json

@@ -2,7 +2,26 @@
   "name": "@smartive/eslint-config",
   "version": "0.0.0-development",
   "description": "ESLint configuration by smartive",
-  "main": "index.js",
+  "files": [
+    "README.md",
+    "LICENSE",
+    "dist"
+  ],
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/esm/index.js",
+      "require": "./dist/cjs/index.js"
+    },
+    "./react-legacy": {
+      "import": "./dist/esm/react-legacy.js",
+      "require": "./dist/cjs/react-legacy.js"
+    },
+    "./typescript-legacy": {
+      "import": "./dist/esm/typescript-legacy.js",
+      "require": "./dist/cjs/typescript-legacy.js"
+    }
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/smartive/eslint-config.git"
@@ -20,26 +39,37 @@
   },
   "homepage": "https://github.com/smartive/eslint-config#readme",
   "dependencies": {
-    "@typescript-eslint/eslint-plugin": "^6.7.4",
-    "@typescript-eslint/parser": "^6.7.4",
-    "eslint-config-prettier": "^9.0.0",
-    "eslint-plugin-import": "^2.25.3",
-    "eslint-plugin-prettier": ">=4.0.0 <6",
-    "eslint-plugin-react": "^7.27.0",
-    "eslint-plugin-react-hooks": "^4.3.0"
+    "@typescript-eslint/eslint-plugin": "^8.15.0",
+    "@typescript-eslint/parser": "^8.15.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-import": "^2.31.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "eslint-plugin-react": "^7.37.2",
+    "eslint-plugin-react-hooks": "^5.0.0",
+    "globals": "^15.13.0",
+    "typescript-eslint": "^8.15.0"
   },
   "peerDependencies": {
-    "eslint": "^8.0.0"
+    "eslint": "^8.57.0 || ^9.0.0"
   },
   "devDependencies": {
-    "@commitlint/cli": "^19.0.0",
-    "@commitlint/config-conventional": "^19.0.0",
+    "@commitlint/cli": "^19.6.0",
+    "@commitlint/config-conventional": "^19.6.0",
+    "@eslint/js": "^9.15.0",
     "@smartive/prettier-config": "^3.0.0",
+    "@types/node": "^22.9.1",
     "cz-conventional-changelog": "^3.3.0",
-    "husky": "^9.0.0",
-    "prettier": "^3.0.0"
+    "esbuild": "0.24.0",
+    "eslint": "^9.15.0",
+    "husky": "^9.1.7",
+    "prettier": "^3.3.3",
+    "typescript": "^5.6.3"
   },
   "scripts": {
+    "build:types": "tsc --declaration --emitDeclarationOnly",
+    "build:cjs": "esbuild --platform=browser --format=cjs --outdir=dist/cjs/ ./src/*.ts",
+    "build:mjs": "esbuild --platform=neutral --format=esm --outdir=dist/esm/ ./src/*.ts",
+    "build": "rm -rf dist && npm run build:cjs && npm run build:mjs && npm run build:types",
     "commitlint": "commitlint --edit",
     "prepare": "[ ! -f node_modules/.bin/husky ] || husky"
   },