.eslintrc.json

{
    "extends": "google",
    "env": {
        "node": true,
        "es6": true
      },
    "ecmaFeatures": {
        "arrowFunctions": true,
        "blockBindings": true,
        "classes": true,
        "defaultParameters": true,
        "destructuring": true,
        "forOf": true,
        "generators": true,
        "modules": true,
        "objectLiteralComputedProperties": true,
        "objectLiteralDuplicateProperties": true,
        "objectLiteralShorthandMethods": true,
        "objectLiteralShorthandProperties": true,
        "regexUFlag": true,
        "regexYFlag": true,
        "restParams": true,
        "spread": true,
        "superInFunctions": true,
        "templateStrings": true,
        "unicodeCodePointEscapes": true,
        "globalReturn": true
    },
    "parserOptions": {
        "ecmaVersion": 2017
    }
}