chore: upgrade ESLint 8→9 with flat config migration

- eslint 8.57.1 to 9.39.4 - @typescript-eslint/eslint-plugin 7.18.0 to 8.59.4 - @typescript-eslint/parser 7.18.0 to 8.59.4 - globals 11.12.0 to 17.6.0 - @eslint/eslintrc and @eslint/js added for FlatCompat - Replace .eslintrc.cjs + .eslintignore with eslint.config.mjs - Use flat configs for react, react-hooks, typescript-eslint directly - FlatCompat only for airbnb-base (no flat config support yet) - Fix no-unused-vars override from airbnb and react/display-name: off Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-22 13:13:30 -04:00
parent b3e7901008
commit d6ae29f8f3
5 changed files with 591 additions and 629 deletions
@@ -0,0 +1,99 @@
+import { FlatCompat } from '@eslint/eslintrc';
+import js from '@eslint/js';
+import tsPlugin from '@typescript-eslint/eslint-plugin';
+import tsParser from '@typescript-eslint/parser';
+import reactPlugin from 'eslint-plugin-react';
+import reactHooksPlugin from 'eslint-plugin-react-hooks';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import globals from 'globals';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+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 [
+  { ignores: ['node_modules/**', 'dist/**', 'experiment/**'] },
+  js.configs.recommended,
+  tsPlugin.configs['flat/eslint-recommended'],
+  ...tsPlugin.configs['flat/recommended'],
+  reactPlugin.configs.flat.recommended,
+  reactHooksPlugin.configs.flat['recommended'],
+  // airbnb-base via FlatCompat (JS/import rules; no React plugin, no getFilename issue)
+  ...compat.extends('airbnb-base'),
+  eslintConfigPrettier,
+  {
+    languageOptions: {
+      parser: tsParser,
+      globals: {
+        ...globals.browser,
+        ...globals.es2021,
+        JSX: 'readonly',
+      },
+      parserOptions: {
+        ecmaFeatures: { jsx: true },
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+      },
+    },
+    settings: {
+      react: {
+        version: '18.2.0',
+      },
+    },
+    rules: {
+      'linebreak-style': 0,
+      'no-unused-vars': 'off', // handled by @typescript-eslint/no-unused-vars
+      'no-underscore-dangle': 0,
+      'no-shadow': 'off',
+
+      'import/prefer-default-export': 'off',
+      'import/extensions': 'off',
+      'import/no-unresolved': 'off',
+      'import/no-extraneous-dependencies': [
+        'error',
+        {
+          devDependencies: true,
+        },
+      ],
+
+      'react/no-unstable-nested-components': ['error', { allowAsProps: true }],
+      'react/jsx-filename-extension': [
+        'error',
+        {
+          extensions: ['.tsx', '.jsx'],
+        },
+      ],
+
+      'react/display-name': 'off',
+      'react/require-default-props': 'off',
+      'react/jsx-props-no-spreading': 'off',
+      'react-hooks/rules-of-hooks': 'error',
+      'react-hooks/exhaustive-deps': 'error',
+      // React Compiler rules added in react-hooks v7 — disabled until React Compiler is adopted
+      'react-hooks/react-compiler': 'off',
+      'react-hooks/incompatible-library': 'off',
+      'react-hooks/refs': 'off',
+      'react-hooks/set-state-in-effect': 'off',
+      'react-hooks/set-state-in-render': 'off',
+      'react-hooks/immutability': 'off',
+      'react-hooks/purity': 'off',
+      'react-hooks/use-memo': 'off',
+
+      '@typescript-eslint/no-unused-vars': 'error',
+      '@typescript-eslint/no-shadow': 'error',
+    },
+  },
+  {
+    files: ['**/*.ts'],
+    rules: {
+      'no-undef': 'off',
+    },
+  },
+];