feat: use flat config format in typescript

.nvmrc

@@ -1 +1 @@
-v22
+v24

README.md

@@ -13,56 +13,41 @@ npm i -D @terrestris/eslint-config-typescript
 Can be omitted for already existing dependencies, also usually the latest version will be installed when omitting the version when running `bun/npm i -D <package>`.
 
 ```bash
-npm i -D eslint@^9
-npm i -D @typescript-eslint/eslint-plugin@^8
-npm i -D @stylistic/eslint-plugin@^4
-npm i -D typescript@^5
+npm i -D eslint@^10
+npm i -D typescript-eslint@^8
+npm i -D @stylistic/eslint-plugin@beta
+npm i -D typescript@^6
 ```
 
 Alternatively using bun:
 
 ```bash
 bun i -D eslint
-bun i -D @typescript-eslint/eslint-plugin
+bun i -D typescript-eslint
 bun i -D @stylistic/eslint-plugin
 bun i -D typescript
 ```
 
-3. Use config in your `eslintrc.js`
+3. Use config in your `eslint.config.ts` (Flat Config)
 
 ```javascript
-module.exports = {
-  extends: '@terrestris/eslint-config-typescript'
-};
+const terrestrisConfig = require('@terrestris/eslint-config-typescript');
+
+module.exports = [
+  ...terrestrisConfig,
+  // your own overrides...
+];
 ```
 
-4. Using eslint v9
-
-First of all, make sure you use a recent node version!
-
-After that, you can use a simple config like this to use this with eslint v9:
-
-```js
-import tsParser from '@typescript-eslint/parser';
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-import js from '@eslint/js';
-import { FlatCompat } from '@eslint/eslintrc';
-
-const filename = fileURLToPath(import.meta.url);
-const dirname = path.dirname(filename);
-const compat = new FlatCompat({
-  baseDirectory: dirname,
-  recommendedConfig: js.configs.recommended,
-  allConfig: js.configs.all
-});
-
-export default [...compat.extends('@terrestris/eslint-config-typescript-react'), {
-  files: ['**/*.ts', '**/*.tsx'],
-  languageOptions: {
-    parser: tsParser,
-  },
-}];
+Or using ESM (`eslint.config.mjs`):
+
+```javascript
+import terrestrisConfig from '@terrestris/eslint-config-typescript';
+
+export default [
+  ...terrestrisConfig,
+  // your own overrides...
+];
 ```
 
 ## Release

eslint.config.ts

@@ -0,0 +1,112 @@
+import tsEslint from 'typescript-eslint';
+import stylistic from '@stylistic/eslint-plugin';
+
+const customRules = {
+  'quote-props': ['warn', 'as-needed'],
+  'keyword-spacing': 'error',
+  '@stylistic/indent': ['warn', 2, { SwitchCase: 1 }],
+  '@stylistic/member-delimiter-style': [
+    'warn',
+    {
+      multiline: {
+        delimiter: 'semi',
+        requireLast: true
+      },
+      singleline: {
+        delimiter: 'semi',
+        requireLast: false
+      }
+    }
+  ],
+  '@stylistic/quotes': ['warn', 'single'],
+  '@stylistic/semi': ['warn', 'always'],
+  '@stylistic/type-annotation-spacing': 'warn',
+  '@typescript-eslint/member-ordering': 'warn',
+  '@typescript-eslint/no-explicit-any': 'off',
+  '@typescript-eslint/switch-exhaustiveness-check': 'error',
+  '@typescript-eslint/naming-convention': [
+    'warn',
+    {
+      selector: 'variable',
+      format: ['camelCase', 'UPPER_CASE', 'PascalCase']
+    },
+    {
+      selector: 'interface',
+      format: ['PascalCase'],
+      custom: {
+        regex: '^I[A-Z]',
+        match: false
+      }
+    }
+  ],
+  'camelcase': 'warn',
+  'comma-dangle': 'off',
+  'curly': 'warn',
+  'dot-notation': 'warn',
+  'eol-last': 'warn',
+  'eqeqeq': ['warn', 'smart'],
+  'guard-for-in': 'warn',
+  'id-denylist': [
+    'warn',
+    'any',
+    'Number',
+    'number',
+    'String',
+    'string',
+    'Boolean',
+    'boolean',
+    'Undefined',
+    'undefined'
+  ],
+  'id-match': 'warn',
+  'max-len': ['warn', { code: 120 }],
+  'no-bitwise': 'warn',
+  'no-caller': 'warn',
+  'no-console': 'warn',
+  'no-debugger': 'warn',
+  'no-empty': 'warn',
+  'no-eval': 'warn',
+  'no-fallthrough': 'warn',
+  'no-multiple-empty-lines': 'warn',
+  'no-new-wrappers': 'warn',
+  'no-redeclare': 'warn',
+  'no-shadow': ['warn', { hoist: 'all' }],
+  'no-trailing-spaces': 'warn',
+  'no-underscore-dangle': ['error', { allowAfterThis: true }],
+  'no-unused-expressions': 'warn',
+  'no-unused-labels': 'warn',
+  'radix': 'warn',
+  'spaced-comment': 'warn'
+};
+
+export default [
+  {
+    files: ['**/*.ts', '**/*.tsx'],
+    languageOptions: {
+      parser: tsEslint.parser,
+      parserOptions: {
+        projectService: true
+      },
+      sourceType: 'module'
+    },
+    plugins: {
+      '@typescript-eslint': tsEslint.plugin,
+      '@stylistic': stylistic
+    },
+    rules: customRules
+  },
+  {
+    files: ['**/*.js', '**/*.jsx'],
+    plugins: {
+      '@stylistic': stylistic
+    },
+    rules: {
+      ...customRules,
+      // Disable typescript-specific rules for JS files
+      '@typescript-eslint/switch-exhaustiveness-check': 'off',
+      '@typescript-eslint/naming-convention': 'off',
+      '@typescript-eslint/member-ordering': 'off',
+      '@typescript-eslint/no-explicit-any': 'off'
+    }
+  }
+];