.eslintrc.js

/** @type {import('eslint').Linter.Config} */
module.exports = {
  extends: ['eslint:recommended', 'plugin:react/recommended', 'prettier'],
  plugins: ['react', 'prettier'],
  env: {
    browser: true,
    es2021: true,
    node: true,
  },
  parserOptions: {
    ecmaFeatures: {
      jsx: true,
    },
    ecmaVersion: 'latest',
    sourceType: 'module',
  },
  rules: {
    'prettier/prettier': 'error',
  },
  overrides: [
    {
      files: '**/*.+(ts|tsx)',
      parser: '@typescript-eslint/parser',
      parserOptions: {
        project: './tsconfig.json',
      },
      plugins: ['react', 'prettier', '@typescript-eslint/eslint-plugin'],
      extends: [
        'eslint:recommended',
        'plugin:react/recommended',
        'plugin:@typescript-eslint/recommended',
        'prettier',
      ],
      rules: {
        '@typescript-eslint/no-unused-vars': [
          'warn',
          {
            varsIgnorePattern: '^_',
          },
        ],
      },
    },
  ],
  settings: {
    react: {
      createClass: 'createReactClass', // Regex for Component Factory to use,
      // default to "createReactClass"
      pragma: 'React', // Pragma to use, default to "React"
      fragment: 'Fragment', // Fragment to use (may be a property of <pragma>), default to "Fragment"
      version: 'detect', // React version. "detect" automatically picks the version you have installed.
      // You can also use `16.0`, `16.3`, etc, if you want to override the detected value.
      // It will default to "latest" and warn if missing, and to "detect" in the future
      flowVersion: '0.53', // Flow version
    },
  },
};