.eslintrc.json

{
  "parser": "babel-eslint",
  "env": {
    "es6": true,
    "mocha": true
  },
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "sourceType": "module"
  },
  "globals": {
    "HTMLImageElement": true
  },
  "extends": [
    "eslint:recommended"
  ],
  "plugins": [
    "react",
    "flowtype"
  ],
  "rules": {
    "flowtype/define-flow-type": 1,
    "flowtype/use-flow-type": 1,
    "react/jsx-uses-vars": 1,
    "react/jsx-uses-react": 1,
    "comma-dangle": [
      "error",
      "always-multiline"
    ],
    "indent": [
      "error",
      2
    ],
    "key-spacing": [
      "error",
      { "mode": "strict", "beforeColon": false, "afterColon": true }
    ],
    "keyword-spacing": [
      "error",
      { "before": true, "after": true }
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "error",
      "single"
    ],
    "semi": [
      "error",
      "always"
    ],
    "space-before-blocks": [
      "error",
      "always"
    ]
  }
}