.eslintrc

{
    "extends": "eslint:recommended",
    "parserOptions": {
      "sourceType": "module"
    },
    "parser": "babel-eslint",
    "plugins": [
      "flowtype",
      "flow-vars"
    ],
    "env": {
      "es6": true,
      "node": true,
      "mocha": true
    },
    "globals": {
      "Class": false
    },
    "rules": {
      "indent": ["error", "tab"],
      "semi": ["error", "always"],
      "space-before-function-paren": ["error", "always"],
      "space-before-blocks": ["error", "always"],
      "quotes": ["error", "double", {"allowTemplateLiterals": true}],
      "keyword-spacing": ["error", {"before": true, "after": true}],
      "eqeqeq": ["error", "always"],
      "prefer-const": ["error"],
      "strict": ["error"],
      "flowtype/require-parameter-type": "error",
      "flowtype/require-return-type": ["error", "always", {annotateUndefined: "always"}],
      "flowtype/space-after-type-colon": ["error", "always"],
      "flow-vars/define-flow-type": 1,
      "flow-vars/use-flow-type": 1
    },
    "settings": {
      "flowtype": {
        "onlyFilesWithFlowAnnotation": true
      }
    }
}