.eslintrc.json

{
    "env": {
        "commonjs": true,
        "es6": true,
        "node": true
    },
    "parserOptions": {
        "ecmaVersion": 2017,
        "sourceType": "script"
    },
    "rules": {
        "array-bracket-spacing": [ "error", "always" ],
        "block-spacing": "error",
        "constructor-super": "warn",
        "indent": [ "error", 4, {
            "SwitchCase": 1
        } ],
        "no-const-assign": "error",
        "no-extra-semi": [ "error" ],
        "no-multiple-empty-lines": [ "error", {
            "max": 1,
            "maxEOF": 1
        } ],
        "no-this-before-super": "error",
        "no-undef": "error",
        "no-unreachable": "warn",
        "no-unused-vars": "warn",
        "no-use-before-define": [
            "error",
            {
                "functions": false
            }
        ],
        "prefer-const": "error",
        "quotes": [ "warn", "single" ],
        "semi": "error",
        "space-in-parens": [ "error", "always" ],
        "space-infix-ops": [ "error", {
            "int32Hint": false
        } ],
        "valid-typeof": "warn"
    }
}