.eslintrc

{
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",

    "ecmaFeatures": {
      "classes": true
    },
    requireConfigFile: false,
    "babelOptions": {
      "plugins": [
        "@babel/plugin-syntax-jsx",
        "@babel/plugin-syntax-flow"
      ]
    }
  },

  "ignorePatterns": ["**/*.ts"],

  "plugins": [
    "flowtype"
  ],

  "rules": {
    "flowtype/boolean-style": [
      2,
      "boolean"
    ],
    "flowtype/define-flow-type": 1,
    "flowtype/delimiter-dangle": 0,
    "flowtype/generic-spacing": [
      2,
      "never"
    ],
    "flowtype/no-mixed": 0,
    "flowtype/no-types-missing-file-annotation": 2,
    "flowtype/no-weak-types": 0,
    "flowtype/require-parameter-type": 0,
    "flowtype/require-readonly-react-props": 0,
    "flowtype/require-return-type": 0,
    "flowtype/require-valid-file-annotation": 0,
    "flowtype/semi": 0,
    "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": 0,
    "flowtype/union-intersection-spacing": [
      2,
      "always"
    ],
    "flowtype/use-flow-type": 1
  },

  "settings": {
    "flowtype": {
      "onlyFilesWithFlowAnnotation": false
    }
  },

  "env": {
    "browser": true,
    "es6": true,
    "mocha": true
  },

  "globals": {
    "IMask": false
  }
}