.eslintrc.json

{
    "env": {
        "browser": true,
        "commonjs": true,
        "es6": true,
        "webextensions": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "sourceType": "module",
        "ecmaVersion": 8
    },
    "rules": {
        "indent": ["error", 4],
        "linebreak-style": ["error", "unix"],
        "quotes": ["error", "double", {"allowTemplateLiterals": true}],
        "semi": ["error", "always"],
        "brace-style": ["error", "1tbs", {"allowSingleLine": true}],
        "comma-style": "error",
        "comma-dangle": ["error", "only-multiline"],
        "curly": ["error", "multi-line"],
        "camelcase": "warn",
        "eqeqeq": "error",
        "dot-notation": "error",
        "no-unused-vars": 1,
        "no-spaced-func": "error",
        "space-before-blocks": "error",
        "space-before-function-paren": ["error", {"anonymous": "always", "named": "never"}],
        "space-in-parens": "error",
        "space-infix-ops": "error",
        "space-unary-ops": "error",
        "keyword-spacing": "error",
        "block-spacing": "error",
        "key-spacing": "error",
        "comma-spacing": "error",
        "no-trailing-spaces": "error",
        "eol-last": "error",
        "no-var": "error"
    }
}