.eslintrc.js

module.exports = {
  env: {
    es6: true,
    browser: true
  },
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: './tsconfig.json',
    sourceType: 'module',
    ecmaFeatures: {
      jsx: true
    },
    warnOnUnsupportedTypeScriptVersion: true
  },
  settings: {
    react: {
      version: 'detect',
    },
  },
  plugins: [
    '@typescript-eslint',
    'import',
    'react',
    'react-hooks',
    'jest',
    'prettier'
  ],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:jest/recommended',
    'plugin:prettier/recommended',
    'prettier/@typescript-eslint',
  ],
  rules: {
    // http://eslint.org/docs/rules/
    'array-callback-return': 'warn',
    'default-case': ['warn', { commentPattern: '^no default$' }],
    'dot-location': ['warn', 'property'],
    'eqeqeq': ['error', 'smart'],
    'getter-return': 'error',
    'jsx-quotes': ['error', 'prefer-double'],
    'max-len': [
      'error',
      {
        code: 120,
        tabWidth: 4,
        ignoreComments: true,
        ignoreUrls: true
      }
    ],
    'new-parens': 'warn',
    'no-array-constructor': 'off', // ts
    'no-caller': 'error',
    'no-empty-function': 'off', // ts
    'no-eval': 'error',
    'no-extend-native': 'error',
    'no-extra-bind': 'error',
    'no-extra-label': 'error',
    'no-extra-parens': 'off', // ts
    'no-implied-eval': 'error',
    'no-iterator': 'error',
    'no-label-var': 'error',
    'no-labels': ['error', { allowLoop: true, allowSwitch: false }],
    'no-lone-blocks': 'error',
    'no-loop-func': 'error',
    'no-mixed-operators': [
      'error',
      {
        groups: [
          ['&', '|', '^', '~', '<<', '>>', '>>>'],
          ['==', '!=', '===', '!==', '>', '>=', '<', '<='],
          ['&&', '||'],
          ['in', 'instanceof'],
        ],
        allowSamePrecedence: false,
      },
    ],
    'no-multi-str': 'error',
    'no-native-reassign': 'error',
    'no-negated-in-lhs': 'error',
    'no-new-func': 'error',
    'no-new-object': 'error',
    'no-new-symbol': 'error',
    'no-new-wrappers': 'error',
    'no-obj-calls': 'error',
    'no-octal-escape': 'error',
    'no-restricted-properties': [
      'error',
      {
        object: 'require',
        property: 'ensure',
        message:
          'Please use import() instead',
      }
    ],
    'no-restricted-syntax': ['error', 'WithStatement'],
    'no-script-url': 'error',
    'no-self-assign': 'error',
    'no-self-compare': 'error',
    'no-sequences': 'error',
    'no-template-curly-in-string': 'error',
    'no-throw-literal': 'error',
    'no-restricted-globals': 'error',
    'no-unused-expressions': [
      'error',
      {
        allowShortCircuit: true,
        allowTernary: true,
        allowTaggedTemplates: true,
      },
    ],
    'no-unused-vars': 'off', // ts
    'no-useless-computed-key': 'error',
    'no-useless-concat': 'error',
    'no-useless-escape': 'error',
    'no-useless-rename': [
      'error',
      {
        ignoreDestructuring: false,
        ignoreImport: false,
        ignoreExport: false,
      },
    ],
    'no-with': 'error',
    'no-whitespace-before-property': 'error',
    'padding-line-between-statements': [
      'warn',
      { blankLine: 'always', prev: '*', next: 'return' },
      { blankLine: 'always', prev: ['const', 'let', 'var'], next: '*' },
      { blankLine: 'any', prev: ['const', 'let', 'var'], next: ['const', 'let', 'var'] }
    ],
    'radix': ['error'],
    'require-await': 'off', // ts
    'require-yield': 'warn',
    'rest-spread-spacing': ['warn', 'never'],
    'strict': ['warn', 'never'],
    'unicode-bom': ['warn', 'never'],
    'use-isnan': 'warn',
    'valid-typeof': 'warn',

    // eslint-plugin-import
    'import/first': 'error',
    'import/newline-after-import': 'error',
    'import/no-absolute-path': 'error',
    'import/no-amd': 'error',
    'import/no-default-export': 'error',
    'import/no-extraneous-dependencies': [
      'error',
      {
        devDependencies: true,
        peerDependencies: true,
        optionalDependencies: false,
      },
    ],
    'import/no-mutable-exports': 'error',
    'import/no-named-default': 'error',
    'import/no-self-import': 'error',

    // typescript-eslint
    '@typescript-eslint/await-thenable': 'error',
    '@typescript-eslint/consistent-type-definitions': 'off',
    '@typescript-eslint/indent': 'off',
    '@typescript-eslint/interface-name-prefix': 'off',
    '@typescript-eslint/member-ordering': 'warn',
    '@typescript-eslint/no-array-constructor': 'error',
    '@typescript-eslint/no-empty-function': 'error',
    '@typescript-eslint/no-empty-interface': [
      'error',
      {
        allowSingleExtends: true
      }
    ],
    '@typescript-eslint/no-floating-promises': 'error',
    '@typescript-eslint/no-for-in-array': 'error',
    '@typescript-eslint/no-misused-new': 'error',
    '@typescript-eslint/no-this-alias': 'error',
    '@typescript-eslint/no-unused-vars': [
      'warn',
      {
        argsIgnorePattern: '^_'
      }
    ],
    '@typescript-eslint/no-use-before-define': 'error',
    '@typescript-eslint/no-useless-constructor': 'error',
    '@typescript-eslint/prefer-for-of': 'warn',
    '@typescript-eslint/prefer-includes': 'warn',
    '@typescript-eslint/prefer-readonly': 'warn',
    '@typescript-eslint/prefer-regexp-exec': 'warn',
    '@typescript-eslint/prefer-string-starts-ends-with': 'warn',
    '@typescript-eslint/promise-function-async': 'off',
    '@typescript-eslint/require-array-sort-compare': 'error',
    '@typescript-eslint/require-await': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    // '@typescript-eslint/strict-boolean-expressions': 'error',
    '@typescript-eslint/type-annotation-spacing': 'error',

    // eslint-plugin-react
    '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': 'warn',
    'react/jsx-no-undef': 'error',
    'react/jsx-pascal-case': [
      'warn',
      {
        allowAllCaps: true,
        ignore: [],
      },
    ],
    'react/jsx-uses-react': 'warn',
    'react/jsx-uses-vars': 'warn',
    'react/no-danger-with-children': 'warn',
    // Disabled because of undesirable warnings
    // See https://github.com/facebook/create-react-app/issues/5204 for
    // blockers until its re-enabled
    'react/no-deprecated': 'off',
    'react/no-direct-mutation-state': 'warn',
    'react/no-is-mounted': 'warn',
    'react/no-typos': 'error',
    'react/react-in-jsx-scope': 'error',
    'react/require-render-return': 'error',
    'react/style-prop-object': 'warn',

    // eslint-plugin-react-hooks
    'react-hooks/rules-of-hooks': 'error',
    'react-hooks/exhaustive-deps': 'warn'
  },
  overrides: [
    {
      files: [
        'src/**/*.test.ts?(x)'
      ],
      env: {
        jest: true,
        'jest/globals': true,
      },
      rules: {
        '@typescript-eslint/no-explicit-any': 'off',
        'jest/no-disabled-tests': 'warn',
        'jest/no-focused-tests': 'error',
        'jest/no-alias-methods': 'error',
        'jest/no-identical-title': 'error',
        'jest/no-jasmine-globals': 'error',
        'jest/no-jest-import': 'error',
        'jest/no-test-prefixes': 'error',
        'jest/no-test-callback': 'error',
        'jest/no-test-return-statement': 'error',
        'jest/prefer-to-have-length': 'warn',
        'jest/prefer-spy-on': 'error',
        'jest/valid-expect': 'error',
      }
    },
    {
      files: [
        'src/icons/**/*.*'
      ],
      rules: {
        'max-len': 'off'
      },
    },
  ],
};