Formatting and linting

eslint.config.js

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+import js from '@eslint/js';
+import globals from 'globals';
+import reactPlugin from 'eslint-plugin-react';
+import reactHooksPlugin from 'eslint-plugin-react-hooks';
+import reactRefreshPlugin from 'eslint-plugin-react-refresh';
+
+export default [
+  {
+    ignores: [
+      '**/node_modules/**',
+      '**/dist/**',
+      '**/.vite/**',
+      '**/coverage/**',
+      '**/*.min.*',
+    ],
+  },
+
+  // Base JS rules
+  js.configs.recommended,
+  {
+    rules: {
+      'no-empty': ['error', { allowEmptyCatch: true }],
+      'no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+        },
+      ],
+    },
+  },
+
+  // Node (server/build) files
+  {
+    files: ['**/*.js', '**/*.mjs'],
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      globals: {
+        ...globals.node,
+      },
+    },
+    rules: {
+      // This repo uses `console.log` for boot logs.
+      'no-console': 'off',
+    },
+  },
+
+  // Browser + React files
+  {
+    files: ['src/**/*.{js,jsx}'],
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      parserOptions: {
+        ecmaFeatures: { jsx: true },
+      },
+      globals: {
+        ...globals.browser,
+      },
+    },
+    plugins: {
+      react: reactPlugin,
+      'react-hooks': reactHooksPlugin,
+      'react-refresh': reactRefreshPlugin,
+    },
+    settings: {
+      react: { version: 'detect' },
+    },
+    rules: {
+      ...reactPlugin.configs.recommended.rules,
+      ...reactHooksPlugin.configs.recommended.rules,
+      'react/react-in-jsx-scope': 'off',
+      'react/prop-types': 'off',
+      'react-refresh/only-export-components': [
+        'warn',
+        { allowConstantExport: true },
+      ],
+    },
+  },
+];
+