.eslintrc.js

module.exports = {
  extends: [
    'react-app',
  ],
  env: {
    'es6': true,
    'node': true,
  },
  plugins: [
    'react',
  ],
  parser: '@babel/eslint-parser',
  parserOptions: {
    ecmaFeatures: {
      'jsx': true,
      'arrowFunctions': true,
    },
  },
  rules: {
    'for-direction': 1,
    'getter-return': 1,
    'no-async-promise-executor': 1,
    'no-compare-neg-zero': 1,
    'no-cond-assign': 0,
    'no-constant-condition': 1,
    'no-control-regex': 1,
    'no-debugger': 1,
    'no-dupe-args': 1,
    'no-dupe-keys': 1,
    'no-duplicate-case': 1,
    'no-empty': 1,
    'no-empty-character-class': 1,
    'no-ex-assign': 1,
    'no-extra-boolean-cast': 1,
    'no-extra-semi': 1,
    'no-func-assign': 1,
    'no-inner-declarations': 1,
    'no-invalid-regexp': 1,
    'no-irregular-whitespace': 1,
    'no-obj-calls': 1,
    'no-prototype-builtins': 0,
    'no-regex-spaces': 1,
    'no-sparse-arrays': 1,
    'no-unexpected-multiline': 1,
    'no-unreachable': 1,
    'no-unsafe-finally': 1,
    'no-unsafe-negation': 1,
    'use-isnan': 1,
    'valid-jsdoc': [1, {
      requireParamDescription: false,
      requireReturnDescription: false,
      requireReturn: false,
      prefer: {returns: 'return'},
    }],
    'valid-typeof': 1,
    'guard-for-in': 1,
    'no-caller': 1,
    'no-case-declarations': 1,
    'no-empty-pattern': 1,
    'no-extend-native': 1,
    'no-extra-bind': 1,
    'no-fallthrough': 1,
    'no-global-assign': 1,
    'no-invalid-this': 1,
    'no-multi-spaces': 1,
    'no-multi-str': 1,
    'no-new-wrappers': 1,
    'no-octal': 1,
    'no-redeclare': 1,
    'no-self-assign': 1,
    'no-throw-literal': 1,
    'no-unused-labels': 1,
    'no-with': 1,
    'prefer-promise-reject-errors': 1,
    'no-delete-var': 1,
    'no-shadow-restricted-names': 0,
    'no-undef': 2,
    'no-unused-vars': [1, {args: 'none'}],
    'array-bracket-newline': 0,
    'array-bracket-spacing': [1, 'never'],
    'array-element-newline': 0,
    'block-spacing': [1, 'never'],
    'brace-style': 1,
    'camelcase': [1, {properties: 'never'}],
    'comma-spacing': 1,
    'comma-style': 1,
    'computed-property-spacing': 1,
    'eol-last': 1,
    'func-call-spacing': 1,
    'key-spacing': 1,
    'keyword-spacing': 1,
    'linebreak-style': 1,
    'max-len': [1, {
      code: 80,
      tabWidth: 2,
      ignoreUrls: true,
    }],
    'new-cap': 1,
    'no-array-constructor': 1,
    'no-mixed-spaces-and-tabs': 1,
    'no-multiple-empty-lines': [1, {max: 2}],
    'no-new-object': 1,
    'no-tabs': 1,
    'no-trailing-spaces': 1,
    'object-curly-spacing': 1,
    'one-var': [1, {
      var: 'never',
      let: 'never',
      const: 'never',
    }],
    'operator-linebreak': [1, 'after'],
    'padded-blocks': [1, 'never'],
    'quote-props': [1, 'consistent'],
    'quotes': [1, 'single', {allowTemplateLiterals: true}],
    'require-jsdoc': [1, {
      require: {
        FunctionDeclaration: true,
        MethodDefinition: true,
        ClassDeclaration: true,
      },
    }],
    'semi': 2,
    'semi-spacing': 1,
    'space-before-blocks': 1,
    'space-before-function-paren': [1, {
      asyncArrow: 'always',
      anonymous: 'never',
      named: 'never',
    }],
    'spaced-comment': [1, 'always'],
    'switch-colon-spacing': 1,
    'arrow-parens': [1, 'always'],
    'constructor-super': 1,
    'generator-star-spacing': [1, 'after'],
    'no-class-assign': 1,
    'no-const-assign': 1,
    'no-dupe-class-members': 1,
    'no-new-symbol': 1,
    'no-this-before-super': 1,
    'no-var': 1,
    'prefer-const': [1, {destructuring: 'all'}],
    'prefer-rest-params': 1,
    'prefer-spread': 1,
    'require-yield': 1,
    'rest-spread-spacing': 1,
    'yield-star-spacing': [1, 'after'],
    'no-misleading-character-class': 1,
    'no-useless-catch': 1,
    'no-useless-escape': 1,
  },
};