.eslintrc.json

{
  "root": true,
  "extends": "airbnb/base",
  "parser": "babel-eslint",
  "plugins": [
    "flow-vars",
    "flowtype"
  ],
  "env": {
    "es6": true,
    "node": true,
    "mocha": true
  },
  "globals": {
    "expect": false,
    "assert": false
  },
  "rules": {
    "quotes": [2, "single"],
    "curly": 2,
    "semi": [2, "always"],
    "flow-vars/define-flow-type": 2,
    "flow-vars/use-flow-type": 2,
    "flowtype/require-parameter-type": 2,
    "flowtype/require-return-type": [
      2,
      "always",
      { "annotateUndefined": "always" }
    ],
    "flowtype/space-after-type-colon": [
      2,
      "always"
    ],
    "flowtype/space-before-type-colon": [
      2,
      "never"
    ],
    "flowtype/type-id-match": [
      2,
      "^([A-Z][a-z0-9]+)+Type$"
    ]
  },
  "settings": {
    "flowtype": {
      "onlyFilesWithFlowAnnotation": false
    }
  }
}