.eslintrc.js

/* @flow */

module.exports = {
  'parser': '@babel/eslint-parser',
  'env': {
    'browser': true,
    'jest': true,
    'node': true,
    'es6': true
  },
  'extends': ['eslint:recommended', 'plugin:react/recommended'],
  'parserOptions': {
    'ecmaFeatures': {
      'experimentalObjectRestSpread': true,
      'jsx': true
    },
    'sourceType': 'module'
  },
  'plugins': [
    'react', 'flowtype'
  ],
  'settings': {
    'react': {
      'version': '16.6',
      'flowVersion': '0.85'
    }
  },
  'rules': {
    'flowtype/define-flow-type': 1,
    'flowtype/require-valid-file-annotation': ['error', 'always'],

    'react/no-unescaped-entities': ['off'],

    'no-unused-vars': ['error', { 'args': 'none' }],

    'indent': ['error', 2],
    'linebreak-style': ['error', 'unix'],
    'quotes': ['error', 'single', 'avoid-escape'],
    'semi': ['error', 'always'],
    'no-var': ['error'],
    'brace-style': ['error'],
    'array-bracket-spacing': ['error', 'never'],
    'block-spacing': ['error', 'always'],
    'no-spaced-func': ['error'],
    'no-whitespace-before-property': ['error'],
    'space-before-blocks': ['error', 'always'],
    'keyword-spacing': ['error']
  }
};