.eslintrc

{
  "parser": "babel-eslint",
  "plugins": ["node", "flowtype", "flowtype-errors"],
  "extends": ["eslint:recommended", "plugin:node/recommended"],
  "parserOptions": {
    "sourceType": "module",
    "allowImportExportEverywhere": false,
    "codeFrame": false
  },
  "rules": {
    "node/exports-style": ["error", "module.exports"],
    "node/no-unsupported-features": "off",
    "no-console": "off",
    "flowtype-errors/show-errors": 1,
    "flowtype/boolean-style": [1, "bool"],
    "flowtype/delimiter-dangle": [1, "never"],
    "flowtype/generic-spacing": [1, "never"],
    "flowtype/no-dupe-keys": 2,
    "flowtype/no-primitive-constructor-types": 1,
    "flowtype/no-types-missing-file-annotation": 2,
    "flowtype/no-weak-types": [2, {
      "any": false,
      "Object": false,
      "Function": true
    }],
    "flowtype/object-type-delimiter": [1, "comma"],
    "flowtype/require-parameter-type": [1, {"excludeArrowFunctions": true, "excludeParameterMatch": "^_.+"}],
    "flowtype/require-return-type": [1, "always", {"excludeArrowFunctions": true}],
    "flowtype/require-valid-file-annotation": [2, "always", {"annotationStyle": "line"}],
    "flowtype/require-variable-type": [1, {"excludeVariableTypes": {
      "var": true,
      "let": true,
      "const": false
    }}],
    "flowtype/semi": [2, "always"],
    "flowtype/space-after-type-colon": [2, "always"],
    "flowtype/space-before-generic-bracket": [2, "never"],
    "flowtype/space-before-type-colon": [2, "never"],
    "flowtype/type-id-match": [
      2,
      "^([A-Z][a-z0-9]*)+Type$"
    ],
    "flowtype/union-intersection-spacing": [2, "always"],
    "flowtype/use-flow-type": 1,
    "flowtype/valid-syntax": 1
  },
  "settings": {
    "flowtype": {
      "onlyFilesWithFlowAnnotation": true
    }
  }
}