.eslintrc.json

{
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 8,
    "sourceType": "module"
  },
  "rules": {
    "no-const-assign": "warn",
    "no-this-before-super": "warn",
    "no-undef": "warn",
    "no-unreachable": "warn",
    "no-unused-vars": "warn",
    "constructor-super": "warn",
    "valid-typeof": "warn",
    "semi": [
      "warn",
      "never"
    ],
    "quotes": [
      "warn",
      "single"
    ],
    "arrow-parens": 0,
    "generator-star-spacing": 0,
    "space-before-function-paren": 0
  }
}