.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
    node: true
  },
  globals: {
    __PATH_PREFIX__: true
  },
  extends: ['react-app', 'eslint:recommended'],
  parserOptions: {
    requireConfigFile: false,
    ecmaFeatures: {
      jsx: true
    },
    ecmaVersion: 12,
    sourceType: 'module'
  },
  settings: {
    //Default settings from https://github.com/yannickcr/eslint-plugin-react#configuration
    react: {
      createClass: 'createReactClass', // Regex for Component Factory to use,
      // default to "createReactClass"
      pragma: 'React', // Pragma to use, default to "React"
      fragment: 'Fragment', // Fragment to use (may be a property of <pragma>), default to "Fragment"
      version: 'detect', // React version. "detect" automatically picks the version you have installed.
      // You can also use `16.0`, `16.3`, etc, if you want to override the detected value.
      // default to latest and warns if missing
      // It will default to "detect" in the future
      flowVersion: '0.53' // Flow version
    },
    propWrapperFunctions: [
      // The names of any function used to wrap propTypes, e.g. `forbidExtraProps`. If this isn't set, any propTypes wrapped in a function will be skipped.
      'forbidExtraProps',
      {property: 'freeze', object: 'Object'},
      {property: 'myFavoriteWrapper'}
    ],
    componentWrapperFunctions: [
      // The name of any function used to wrap components, e.g. Mobx `observer` function. If this isn't set, components wrapped by these functions will be skipped.
      'observer', // `property`
      {property: 'styled'}, // `object` is optional
      {property: 'observer', object: 'Mobx'},
      {property: 'observer', object: '<pragma>'} // sets `object` to whatever value `settings.react.pragma` is set to
    ],
    linkComponents: [
      // Components used as alternatives to <a> for linking, eg. <Link to={ url } />
      'Hyperlink',
      {name: 'Link', linkAttribute: 'to'}
    ]
  },
  plugins: ['@babel', 'react'],
  rules: {
    'react/prop-types': 'off',
    'react/display-name': 'off',
    'no-unused-vars': 'warn',
    'no-console': 'error'
  },
  overrides: [
    {
      files: [
        '.eslintrc.js',
        'gatsby-config.js',
        'gatsby-node.js',
        'scripts/*.js',
        'src/build-utils.js'
      ],
      env: {
        node: true
      }
    }
  ]
};