EsLint v9 (#154)

* Upgrade ESLint and related configurations to version 9

- Update ESLint to version 9.19.0
- Migrate ESLint configurations to flat config format
- Remove deprecated ESLint config files
- Update package dependencies and configurations
- Simplify ESLint setup across packages
- Remove unnecessary ESLint config blocks from package.json files
- Improved CI caching with Turborepo tasks
- Removed duplicate styles

tooling/eslint/base.js

@@ -1,63 +1,92 @@
-/** @type {import("eslint").Linter.Config} */
-const config = {
-  extends: [
-    'turbo',
-    'eslint:recommended',
-    'plugin:@typescript-eslint/recommended-type-checked',
-    'plugin:@typescript-eslint/stylistic-type-checked',
-    'prettier',
-  ],
-  env: {
-    es2022: true,
-    node: true,
-  },
-  parser: '@typescript-eslint/parser',
-  parserOptions: {
-    project: true,
-  },
-  plugins: ['@typescript-eslint', 'import'],
-  rules: {
-    'turbo/no-undeclared-env-vars': 'off',
-    '@typescript-eslint/array-type': 'off',
-    '@typescript-eslint/no-unsafe-assignment': 'off',
-    '@typescript-eslint/no-unsafe-argument': 'off',
-    '@typescript-eslint/consistent-type-definitions': 'off',
-    '@typescript-eslint/no-unsafe-member-access': 'off',
-    '@typescript-eslint/non-nullable-type-assertion-style': 'off',
-    '@typescript-eslint/only-throw-error': 'off',
-    '@typescript-eslint/prefer-nullish-coalescing': 'off',
-    '@typescript-eslint/no-unused-vars': [
-      'error',
-      { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
-    ],
-    '@typescript-eslint/no-misused-promises': [
-      2,
-      { checksVoidReturn: { attributes: false } },
-    ],
-    'no-restricted-imports': [
-      'error',
-      {
-        paths: [
-          {
-            name: 'react-i18next',
-            importNames: ['Trans'],
-            message: 'Please use `@kit/ui/trans` instead',
-          },
-        ],
-      },
-    ],
-  },
-  ignorePatterns: [
-    '**/.eslintrc.cjs',
-    '**/*.config.js',
-    '**/*.config.cjs',
-    '**/node_modules',
-    'database.types.ts',
-    '.next',
-    'dist',
-    'pnpm-lock.yaml',
-  ],
-  reportUnusedDisableDirectives: true,
-};
+import eslint from '@eslint/js';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import eslintReact from 'eslint-plugin-react';
+import reactPlugin from 'eslint-plugin-react';
+import hooksPlugin from 'eslint-plugin-react-hooks';
+import tsEsLint from 'typescript-eslint';
 
-module.exports = config;
+import nextConfig from './nextjs.js';
+
+export default tsEsLint.config(
+  eslint.configs.recommended,
+  tsEsLint.configs.recommended,
+  eslintReact.configs.flat.recommended,
+  {
+    languageOptions: {
+      parserOptions: {
+        ecmaVersion: 2022,
+        sourceType: 'module',
+        ecmaFeatures: {
+          jsx: true,
+          modules: true,
+        },
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+  },
+  {
+    plugins: {
+      'react-hooks': hooksPlugin,
+    },
+    rules: hooksPlugin.configs.recommended.rules,
+  },
+  {
+    files: ['**/*.{ts,tsx}'],
+    ...reactPlugin.configs.flat['jsx-runtime'],
+    ...reactPlugin.configs.flat.recommended,
+  },
+  nextConfig,
+  eslintConfigPrettier,
+  {
+    rules: {
+      'react/react-in-jsx-scope': 'off',
+      'import/no-anonymous-default-export': 'off',
+      'turbo/no-undeclared-env-vars': 'off',
+      '@typescript-eslint/array-type': 'off',
+      '@typescript-eslint/no-unsafe-assignment': 'off',
+      '@typescript-eslint/no-unsafe-argument': 'off',
+      '@typescript-eslint/consistent-type-definitions': 'off',
+      '@typescript-eslint/no-unsafe-member-access': 'off',
+      '@typescript-eslint/non-nullable-type-assertion-style': 'off',
+      '@typescript-eslint/only-throw-error': 'off',
+      '@typescript-eslint/prefer-nullish-coalescing': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
+      ],
+      '@typescript-eslint/no-misused-promises': [
+        2,
+        { checksVoidReturn: { attributes: false } },
+      ],
+      'no-restricted-imports': [
+        'error',
+        {
+          paths: [
+            {
+              name: 'react-i18next',
+              importNames: ['Trans'],
+              message: 'Please use `@kit/ui/trans` instead',
+            },
+          ],
+        },
+      ],
+    },
+  },
+  {
+    ignores: [
+      '**/node_modules',
+      '**/database.types.ts',
+      '.next',
+      'dist',
+      'pnpm-lock.yaml',
+    ],
+  },
+);