ESLint vs Biome Comparison

// eslint.config.js (ESLint 9 flat config)
import js from '@eslint/js';
import typescript from '@typescript-eslint/eslint-plugin';
import tsParser from '@typescript-eslint/parser';
import reactHooks from 'eslint-plugin-react-hooks';

export default [
  js.configs.recommended,
  {
    files: ['**/*.{ts,tsx}'],
    languageOptions: {
      parser: tsParser,
      parserOptions: { project: './tsconfig.json' }
    },
    plugins: {
      '@typescript-eslint': typescript,
      'react-hooks': reactHooks
    },
    rules: {
      '@typescript-eslint/no-explicit-any': 'error',
      '@typescript-eslint/no-unused-vars': 'error',
      'react-hooks/rules-of-hooks': 'error',
      'react-hooks/exhaustive-deps': 'warn'
    }
  }
];

// biome.json — lint + format configuration
{
  "$schema": "https://biomejs.dev/schemas/1.8.0/schema.json",
  "organizeImports": { "enabled": true },
  "linter": {
    "enabled": true,
    "rules": {
      "recommended": true,
      "correctness": { "noUnusedVariables": "error" },
      "suspicious": { "noExplicitAny": "error" },
      "style": { "useConst": "warn" }
    }
  },
  "formatter": {
    "enabled": true,
    "indentStyle": "space",
    "indentWidth": 2,
    "lineWidth": 100
  },
  "javascript": {
    "formatter": { "quoteStyle": "single", "trailingCommas": "es5" }
  }
}