.eslintrc.js

const OFF = 0;
const WARNING = 1;
const ERROR = 2;

module.exports = {
  parser: 'babel-eslint',

  extends: './node_modules/fbjs-scripts/eslint/.eslintrc.js',

  plugins: [
    'react',
    'react-internal',
  ],

  ecmaFeatures: {
    modules: false
  },

  // We're stricter than the default config, mostly. We'll override a few rules
  // and then enable some React specific ones.
  rules: {
    'accessor-pairs': OFF,
    'brace-style': [ERROR, '1tbs'],
    'comma-dangle': [ERROR, 'always-multiline'],
    'consistent-return': ERROR,
    'dot-location': [ERROR, 'property'],
    'dot-notation': ERROR,
    'eol-last': ERROR,
    'eqeqeq': [ERROR, 'allow-null'],
    'indent': [ERROR, 2, {SwitchCase: 1}],
    'jsx-quotes': [ERROR, 'prefer-double'],
    'no-bitwise': OFF,
    'no-inner-declarations': [ERROR, 'functions'],
    'no-multi-spaces': ERROR,
    'no-restricted-syntax': [ERROR, 'WithStatement'],
    'no-shadow': ERROR,
    'no-unused-expressions': ERROR,
    'no-unused-vars': [ERROR, {args: 'none'}],
    'quotes': [ERROR, 'single', 'avoid-escape'],
    'space-after-keywords': ERROR,
    'space-before-blocks': ERROR,
    'space-before-function-paren': [ERROR, {anonymous: 'never', named: 'never'}],
    'space-before-keywords': ERROR,
    'strict': [ERROR, 'global'],

    // React & JSX
    // Our transforms set this automatically
    'react/display-name': OFF,
    'react/jsx-boolean-value': [ERROR, 'always'],
    'react/jsx-no-undef': ERROR,
    // We don't care to do this
    'react/jsx-sort-prop-types': OFF,
    'react/jsx-sort-props': OFF,
    'react/jsx-uses-react': ERROR,
    'react/jsx-uses-vars': ERROR,
    // It's easier to test some things this way
    'react/no-did-mount-set-state': OFF,
    'react/no-did-update-set-state': OFF,
    // We define multiple components in test files
    'react/no-multi-comp': OFF,
    'react/no-unknown-property': OFF,
    // This isn't useful in our test code
    'react/prop-types': OFF,
    'react/react-in-jsx-scope': ERROR,
    'react/self-closing-comp': ERROR,
    // We don't care to do this
    'react/sort-comp': OFF,
    'react/wrap-multilines': [ERROR, {declaration: false, assignment: false}],

    // CUSTOM RULES
    // the second argument of warning/invariant should be a literal string
    'react-internal/warning-and-invariant-args': ERROR,
  }
};