.eslintrc.json

{
    "root": true,
    "parserOptions": {
        "ecmaVersion": 2017
    },
    "env": {
        "browser": true,
        "es6": true,
        "webextensions": true
    },
    "extends": [
        "eslint:recommended"
    ],
    "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", 4],
        "one-var": ["off", "never"],
        "spaced-comment": ["off", "always"],
        "space-before-function-paren": ["error", {
            "anonymous": "always",
            "named": "never",
            "asyncArrow": "always"
        }]
    }
}