.eslintrc.json

{
  "root": true,
  "parserOptions": {
    "ecmaVersion": 2017
  },
  "env": {
    "browser": true,
    "es6": true,
    "webextensions": true
  },
  "extends": [
    "eslint:recommended",
    "prettier"
  ],
  "rules": {
    "no-console": 0,
    "no-unused-vars": [
          "error",
      { "vars": "all", "args": "none", "ignoreRestSiblings": false }
    ],
    "no-undef": ["error"],
    "no-proto": ["error"],
    //        "prefer-arrow-callback": ["warn"],  TODO: refactor to use arrow functions
    //        "no-var": ["error"],  TODO: refactor to use let and const
    "prefer-spread": ["warn"],
//    "semi": ["error", "always"],
    "padded-blocks": ["off", { "blocks": "never" }],
//    "indent": ["error", 2],
    "one-var": ["off", "never"],
    "spaced-comment": ["off", "always"]
//    "space-before-function-paren": [
//      "error",
//      {
//        "anonymous": "always",
//        "named": "never",
//        "asyncArrow": "always"
//      }
//    ]
  }
}