.eslintrc.json

{
    "env": {
        "browser": true,
        "commonjs": true,
        "es6": true,
        "node": true
    },
    "parser": "babel-eslint",
    "parserOptions": {
        "ecmaFeatures": {
            "modules": true
        },
        "ecmaVersion": 7,
        "sourceType": "module"
    },
    "rules": {
        "space-before-function-paren": [
            "error",
            {
                "anonymous": "always",
                "named": "always",
                "asyncArrow": "always"
            }
        ],
        "max-len": ["error", 80, 4],
        "no-trailing-spaces": "error",
        "no-const-assign": "warn",
        "no-this-before-super": "warn",
        "no-unreachable": "warn",
        "no-unused-vars": "off",
        "constructor-super": "warn",
        "valid-typeof": "warn",
        "brace-style": [
            "error",
            "1tbs",
            {
                "allowSingleLine": true
            }
        ]
    }
}