index.js

module.exports = {
  env: {
    browser: true,
    commonjs: true,
    es6: true,
    jest: true,
    node: true,
  },
  extends: ['prettier'],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaFeatures: {
      jsx: true,
    },
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  plugins: [
    '@typescript-eslint',
    'import',
    'jest',
    'jsx-a11y',
    'react',
    'react-hooks',
    'testing-library',
  ],
  root: true,
  settings: {
    react: {
      version: 'detect',
    },
  },
  // Rules
  rules: {
    // Disable these Eslint specific rules because TypeScript covers them.
    'default-case': 'off',
    'no-array-constructor': 'off',
    'no-dupe-class-members': 'off',
    'no-redeclare': 'off',
    'no-undef': 'off',
    'no-unused-expressions': 'off',
    'no-unused-vars': 'off',
    'no-use-before-define': 'off',
    'no-useless-constructor': 'off',
    // TypeScript
    '@typescript-eslint/ban-ts-ignore': 'off',
    '@typescript-eslint/consistent-type-assertions': 'warn',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/no-array-constructor': 'warn',
    '@typescript-eslint/no-explicit-any': 'warn',
    '@typescript-eslint/no-redeclare': 'warn',
    '@typescript-eslint/no-unused-expressions': [
      'error',
      {
        allowShortCircuit: true,
        allowTernary: true,
        allowTaggedTemplates: true,
      },
    ],
    '@typescript-eslint/no-unused-vars': [
      'warn',
      {
        args: 'none',
        ignoreRestSiblings: true,
      },
    ],
    '@typescript-eslint/no-useless-constructor': 'warn',
    '@typescript-eslint/no-use-before-define': [
      'warn',
      {
        functions: false,
        classes: false,
        variables: false,
        typedefs: false,
      },
    ],
    // Import rules
    'import/first': 'error',
    'import/no-amd': 'error',
    'import/no-anonymous-default-export': 'warn',
    'import/no-webpack-loader-syntax': 'error',
    // React rules
    'react/forbid-foreign-prop-types': ['warn', { allowInPropTypes: true }],
    'react/jsx-no-comment-textnodes': 'warn',
    'react/jsx-no-duplicate-props': 'warn',
    'react/jsx-no-target-blank': 'error',
    'react/jsx-no-undef': 'error',
    'react/jsx-pascal-case': [
      'warn',
      {
        allowAllCaps: true,
        ignore: [],
      },
    ],
    'react/no-danger-with-children': 'error',
    'react/no-direct-mutation-state': 'error',
    'react/no-is-mounted': 'warn',
    'react/no-typos': 'error',
    'react/require-render-return': 'error',
    'react/style-prop-object': 'error',
    'react/jsx-uses-vars': 'warn',
    'react/jsx-uses-react': 'warn',
    'react/prop-types': 'off',
    'react/react-in-jsx-scope': 'off',
    // React hook rules
    'react-hooks/exhaustive-deps': 'error',
    'react-hooks/rules-of-hooks': 'error',
    // jsx-a11y rules
    'jsx-a11y/alt-text': 'error',
    'jsx-a11y/anchor-has-content': 'error',
    'jsx-a11y/anchor-is-valid': [
      'error',
      {
        aspects: ['noHref', 'invalidHref'],
      },
    ],
    'jsx-a11y/aria-activedescendant-has-tabindex': 'warn',
    'jsx-a11y/aria-props': 'warn',
    'jsx-a11y/aria-proptypes': 'warn',
    'jsx-a11y/aria-role': ['warn', { ignoreNonDOM: true }],
    'jsx-a11y/aria-unsupported-elements': 'warn',
    'jsx-a11y/heading-has-content': 'warn',
    'jsx-a11y/iframe-has-title': 'warn',
    'jsx-a11y/img-redundant-alt': 'warn',
    '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',
    // Jest rules
    'jest/no-conditional-expect': 'error',
    'jest/no-identical-title': 'error',
    'jest/no-interpolation-in-snapshots': 'error',
    'jest/no-jasmine-globals': 'error',
    'jest/no-jest-import': 'error',
    'jest/no-mocks-import': 'error',
    'jest/valid-describe-callback': 'error',
    'jest/valid-expect': 'error',
    'jest/valid-expect-in-promise': 'error',
    'jest/valid-title': 'warn',
    // Testing-Library rules
    'testing-library/await-async-query': 'error',
    'testing-library/await-async-utils': 'error',
    'testing-library/no-await-sync-query': 'warn',
    'testing-library/no-dom-import': ['error', 'react'],
    'testing-library/no-wait-for-empty-callback': 'error',
    'testing-library/no-wait-for-snapshot': 'error',
    // Other rules
    'array-callback-return': 'warn',
    eqeqeq: ['warn', 'smart'],
    'no-caller': 'warn',
    'no-cond-assign': ['warn', 'except-parens'],
    'no-const-assign': 'warn',
    'no-control-regex': 'warn',
    'no-delete-var': 'warn',
    'no-dupe-args': '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-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-unreachable': 'warn',
    'no-unused-labels': 'warn',
    'no-useless-computed-key': 'warn',
    'no-useless-concat': 'warn',
    'no-useless-escape': 'warn',
    'no-useless-rename': [
      'warn',
      {
        ignoreDestructuring: false,
        ignoreImport: false,
        ignoreExport: false,
      },
    ],
    'require-yield': 'warn',
    strict: ['warn', 'never'],
    'use-isnan': 'warn',
    'valid-typeof': 'warn',
    'no-restricted-properties': [
      'error',
      {
        object: 'require',
        property: 'ensure',
        message:
          'Please use import() instead. More info: https://facebook.github.io/create-react-app/docs/code-splitting',
      },
      {
        object: 'System',
        property: 'import',
        message:
          'Please use import() instead. More info: https://facebook.github.io/create-react-app/docs/code-splitting',
      },
    ],
    'getter-return': 'warn',
  },
}