.eslintrc.json

{
    "extends": "standard",
    "plugins": [
        "standard",
        "promise",
        "extra-rules"
    ],
    "parserOptions": {
        "ecmaVersion": 2017
    },
    "globals": {
        "$": true
    },
    "env": {
        "browser": true,
        "node": true
    },
    "rules": {
        "quotes": ["error", "single"],
        "prefer-arrow-callback": [ "error", { "allowNamedFunctions": true } ],
        "consistent-return": 2,
        "no-var"           : 2,
        "new-cap"          : 0,
        "indent"           : 0,
        "no-else-return"   : 1,
        "semi"             : [1, "always"],
        "space-unary-ops"  : 2,
        "no-undef": 1,
        "no-unused-vars": 1,
        "extra-rules/no-commented-out-code": "warn",
        "keyword-spacing": [
            "error", { 
                "before": false, "after": false, "overrides": {
                "const": { 
                    "after": true
                },
                "return": { 
                    "after": true
                },
                "case": { 
                    "after": true
                }
            }
        }],
        "space-before-function-paren": 0,
        "space-before-blocks": ["error", "never"],
        "camelcase": 0,
        "handle-callback-err": ["error", "none"],
        "object-curly-spacing": ["error", "always"]
    }
}