ES6 Utility Class: Create a new element and attach it to another one

utility.js

export const Utility = {
    createElement: function(tagName = 'DIV', className, appendTo) {
        let element = document.createElement(tagName);
        element.className = className;
        if(typeof appendTo !== 'undefined'){
           appendTo.appendChild(element);
        }
        return element;
    }
};