.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
    node: true,
  },
  extends: [
    'eslint:recommended',
    'plugin:react/recommended',
    'plugin:jest/recommended',
    'plugin:jest/style',
    'airbnb',
  ],
  globals: {
    Atomics: 'readonly',
    SharedArrayBuffer: 'readonly',
  },
  parser: 'babel-eslint',
  parserOptions: {
    ecmaFeatures: {
      jsx: true,
    },
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  plugins: ['import', 'react', 'react-hooks'],
  rules: {
    'import/extensions': [
      'error',
      'ignorePackages',
      {
        js: 'never',
        jsx: 'never',
        ts: 'never',
        tsx: 'never',
      },
    ],
    'import/no-extraneous-dependencies': [
      'error',
      { devDependencies: ['**/setupTests.*', '**/*.test.*'] },
    ],
    'react/jsx-filename-extension': [
      'warn',
      {
        extensions: ['.js', '.jsx', '.ts', '.tsx'],
      },
    ],
    'react-hooks/rules-of-hooks': 'error',
    'react-hooks/exhaustive-deps': 'warn',
  },
  ignorePatterns: ['build/', 'coverage/', 'node_modules/'],
  settings: {
    'spaced-comment': ['error', 'always', { markers: ['/'] }],
    'import/resolver': {
      node: {
        extensions: ['.js', '.jsx', '.ts', '.tsx'],
        paths: ['src'],
      },
    },
  },
  overrides: [
    //
    // JavaScript
    //
    {
      files: ['*.js', '**/*.js', '*.jsx', '**/*.jsx'],
      extends: ['plugin:prettier/recommended', 'prettier/react'],
    },
    //
    // TypeScript
    //
    {
      files: ['*.ts', '**/*.ts', '*.tsx', '**/*.tsx'],
      parser: '@typescript-eslint/parser',
      extends: [
        'plugin:@typescript-eslint/eslint-recommended',
        'plugin:@typescript-eslint/recommended',
        // 'plugin:@typescript-eslint/recommended-requiring-type-checking',
        'plugin:prettier/recommended',
        'prettier/react',
        'prettier/@typescript-eslint',
      ],
    },
  ],
};