.eslintrc.js

const restrictedGlobals = ['addEventListener'];

const options = {
  root: true,
  parser: 'babel-eslint',
  plugins: ['prettier', 'import', 'jsx-a11y', 'react'],
  extends: ['plugin:prettier/recommended'],
  globals: {
    React: true,
    document: true,
    window: true,
    localStorage: true,
    fetch: true,
  },
  env: {
    browser: true,
    commonjs: true,
    es2021: true,
    node: true,
  },

  parserOptions: {
    ecmaVersion: 11,
    sourceType: 'module',
    ecmaFeatures: {
      jsx: true,
    },
  },

  settings: {
    react: {
      createClass: 'createReactClass',
      pragma: 'React',
      version: 'detect',
      flowVersion: '0.53',
    },
  },

  rules: {
    'prettier/prettier': [
      'error',
      {
        singleQuote: true,
        printWidth: 120,
        arrowParens: 'always',
        semi: true,
        trailingComma: 'all',
        bracketSpacing: true,
        jsxBracketSameLine: false,
        endOfLine: 'auto',
      },
    ],
    'array-callback-return': 'warn',
    'comma-dangle': 0,
    'default-case': ['warn', { commentPattern: '^no default$' }],
    'dot-location': ['warn', 'property'],
    'max-len': [1, 120, 2, { ignoreComments: true }],
    'new-parens': 'warn',
    'no-array-constructor': 'warn',
    'no-caller': 'warn',
    'no-cond-assign': ['warn', 'always'],
    'no-const-assign': 'warn',
    'no-control-regex': 'warn',
    'no-delete-var': 'warn',
    'no-dupe-args': 'warn',
    'no-dupe-class-members': 'warn',
    'no-dupe-keys': 'warn',
    'no-duplicate-case': 'warn',
    'no-empty-character-class': 'warn',
    'no-empty-pattern': 'warn',
    'no-eval': 'warn',
    'no-ex-assign': 'warn',
    'no-extend-native': 'warn',
    'no-extra-bind': 'warn',
    'no-extra-label': 'warn',
    'no-fallthrough': 'warn',
    'no-func-assign': 'warn',
    'no-implied-eval': 'warn',
    'no-invalid-regexp': 'warn',
    'no-iterator': 'warn',
    'no-label-var': 'warn',
    'no-labels': ['warn', { allowLoop: true, allowSwitch: false }],
    'no-lone-blocks': 'warn',
    'no-loop-func': 'warn',
    'no-mixed-operators': [
      'warn',
      {
        groups: [
          ['&', '|', '^', '~', '<<', '>>', '>>>'],
          ['==', '!=', '===', '!==', '>', '>=', '<', '<='],
          ['&&', '||'],
          ['in', 'instanceof'],
        ],
        allowSamePrecedence: false,
      },
    ],
    'no-multi-str': 'warn',
    'no-native-reassign': 'warn',
    'no-negated-in-lhs': 'warn',
    'no-new-func': 'warn',
    'no-new-object': 'warn',
    'no-new-symbol': 'warn',
    'no-new-wrappers': 'warn',
    'no-obj-calls': 'warn',
    'no-octal': 'warn',
    'no-octal-escape': 'warn',
    'no-redeclare': 'warn',
    'no-regex-spaces': 'warn',
    'no-restricted-syntax': ['warn', 'WithStatement'],
    'no-script-url': 'warn',
    'no-self-assign': 'warn',
    'no-self-compare': 'warn',
    'no-sequences': 'warn',
    'no-shadow-restricted-names': 'warn',
    'no-sparse-arrays': 'warn',
    'no-template-curly-in-string': 'warn',
    'no-this-before-super': 'warn',
    'no-throw-literal': 'warn',
    'no-undef': 'warn',
    'no-restricted-globals': ['error'].concat(restrictedGlobals),
    'no-unexpected-multiline': 'warn',
    'no-unreachable': 'warn',
    'no-unused-expressions': [
      'warn',
      {
        allowShortCircuit: true,
        allowTernary: true,
        allowTaggedTemplates: true,
      },
    ],
    'no-unused-labels': 'warn',
    'no-unused-vars': [
      'warn',
      {
        args: 'none',
        ignoreRestSiblings: true,
      },
    ],
    'no-use-before-define': [
      'warn',
      {
        functions: false,
        classes: false,
        variables: false,
      },
    ],
    'no-useless-computed-key': 'warn',
    'no-useless-concat': 'warn',
    'no-useless-constructor': 'warn',
    'no-useless-escape': 'warn',
    'no-useless-rename': [
      'warn',
      {
        ignoreDestructuring: false,
        ignoreImport: false,
        ignoreExport: false,
      },
    ],
    'no-with': 'warn',
    'no-whitespace-before-property': 'warn',
    'prefer-const': 'warn',
    radix: 'warn',
    'require-yield': 'warn',
    'rest-spread-spacing': ['warn', 'never'],
    strict: ['warn', 'never'],
    'unicode-bom': ['warn', 'never'],
    'use-isnan': 'warn',
    'valid-typeof': 'warn',
    'no-restricted-properties': [
      'error',
      {
        object: 'System',
        property: 'import',
        message: `Please use import() instead. More info:
          https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/
          template/README.md#code-splitting`,
      },
    ],

    // https://github.com/benmosher/eslint-plugin-import/tree/master/docs/rules
    'import/first': 'error',
    'import/no-amd': 'error',
    'import/no-webpack-loader-syntax': 'error',
    'import/no-extraneous-dependencies': ['error', { devDependencies: true }],
    // Notify about files that aren't used in the project, to make it work in vscode - edit your settings and override
    // the value there with "eslint.options": { "rules": { "import/no-unused-modules": 0 }}
    // read the issue : https://github.com/microsoft/vscode-eslint/issues/717
    // 'import/no-unused-modules': [1, { unusedExports: true }],

    // https://github.com/yannickcr/eslint-plugin-react/tree/master/docs/rules
    'react/jsx-no-comment-textnodes': 'warn',
    'react/jsx-no-duplicate-props': ['warn', { ignoreCase: true }],
    'react/jsx-no-target-blank': 'warn',
    'react/jsx-no-undef': ['error', { allowGlobals: true }],
    'react/jsx-pascal-case': [
      'warn',
      {
        allowAllCaps: true,
        ignore: [],
      },
    ],
    'react/jsx-uses-react': 'warn',
    'react/jsx-uses-vars': 'warn',
    'react/no-danger-with-children': 'warn',
    'react/no-deprecated': 'warn',
    'react/no-direct-mutation-state': 'warn',
    'react/no-is-mounted': 'warn',
    'react/react-in-jsx-scope': 'error',
    'react/require-render-return': 'error',
    'react/style-prop-object': 'warn',
    'react/jsx-first-prop-new-line': [2, 'multiline'],
    // https://github.com/evcohen/eslint-plugin-jsx-a11y/tree/master/docs/rules
    'jsx-a11y/accessible-emoji': 'warn',
    'jsx-a11y/alt-text': 'warn',
    'jsx-a11y/anchor-has-content': 0,
    'jsx-a11y/aria-activedescendant-has-tabindex': 'warn',
    'jsx-a11y/aria-props': 'warn',
    'jsx-a11y/aria-proptypes': 'warn',
    'jsx-a11y/aria-role': 'warn',
    'jsx-a11y/aria-unsupported-elements': 'warn',
    'jsx-a11y/heading-has-content': 'warn',
    // This is throwing a wild error
    // 'jsx-a11y/href-no-hash': 'warn',
    'jsx-a11y/iframe-has-title': 'warn',
    'jsx-a11y/img-redundant-alt': 'warn',
    'jsx-a11y/label-has-for': 0,
    'jsx-a11y/no-access-key': 'warn',
    'jsx-a11y/no-distracting-elements': 'warn',
    'jsx-a11y/no-redundant-roles': 'warn',
    'jsx-a11y/role-has-required-aria-props': 'warn',
    'jsx-a11y/role-supports-aria-props': 'warn',
    'jsx-a11y/scope': 'warn',
  },
};

module.exports = options;