.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
    jest: true,
  },
  extends: [
    'plugin:react/recommended',
    'plugin:@typescript-eslint/recommended',
    // 'prettier/@typescript-eslint',
    // 'plugin:prettier/recommended',
    'airbnb',
    'plugin:import/errors',
    'plugin:import/warnings',
    'plugin:import/typescript',
  ],

  globals: {
    Atomics: 'readonly',
    SharedArrayBuffer: 'readonly',
  },
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaFeatures: {
      jsx: true,
    },
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  plugins: ['react', '@typescript-eslint', 'prettier'],
  rules: {
    'import/extensions': [
      'error',
      'ignorePackages',
      {
        js: 'never',
        jsx: 'never',
        ts: 'never',
        tsx: 'never',
        mjs: 'never',
      },
    ],
    'react/jsx-filename-extension': [2, { extensions: ['.js', '.jsx', '.ts', '.tsx'] }],
    'react/jsx-props-no-spreading': 'off',
    'import/prefer-default-export': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    'no-console': 'off',
    'arrow-parens': 'off',
    'react/no-array-index-key': 'off',
    'object-curly-newline': 'off',
    'implicit-arrow-linebreak': 'off',
  },
  overrides: [
    {
      files: ['**/*.test.ts'],
      env: {
        jest: true, // now **/*.test.js files' env has both es6 *and* jest
      },
      // Can't extend in overrides: https://github.com/eslint/eslint/issues/8813
      // "extends": ["plugin:jest/recommended"]
      plugins: ['jest'],
      rules: {
        'jest/no-disabled-tests': 'warn',
        'jest/no-focused-tests': 'error',
        'jest/no-identical-title': 'error',
        'jest/prefer-to-have-length': 'warn',
        'jest/valid-expect': 'error',
      },
    },
  ],
  settings: {
    react: {
      version: 'detect', // Tells eslint-plugin-react to automatically detect the version of React to use
    },
  },
};