.eslintrc.json

{
  "extends": "google",
  // http://eslint.org/docs/rules/
  "rules": {
    "max-len": [2, 100, {
      "ignoreComments": true,
      "ignoreUrls": true,
      "tabWidth": 2
    }],
    "no-implicit-coercion": [2, {
      "boolean": false,
      "number": true,
      "string": true
    }],
    "no-unused-expressions": [2, {
      "allowShortCircuit": true,
      "allowTernary": false
    }],
    "no-unused-vars": [2, {
      "vars": "all",
      "args": "after-used",
      "argsIgnorePattern": "(^reject$|^_$)",
      "varsIgnorePattern": "(^_$)"
    }],
    "quotes": [2, "single"],
    "require-jsdoc": 0,
    "valid-jsdoc": 0,
    "prefer-arrow-callback": 1,
    "no-var": 1
  },
  // http://eslint.org/docs/user-guide/configuring#specifying-environments
  "env": {
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 2017
  }
}