nespaint/app/js/common/Utils.js

const utils = {
  isElement:function(el){
    // Code based on...
    // https://stackoverflow.com/questions/384286/javascript-isdom-how-do-you-check-if-a-javascript-object-is-a-dom-object
    try {
      // Using W3 DOM2 (works for FF, Opera and Chrome)
      return obj instanceof HTMLElement;
    } catch(e) {
      // Browsers not supporting W3 DOM2 don't have HTMLElement and
      // an exception is thrown and we end up here. Testing some
      // properties that all elements have (works on IE7)
      return (typeof obj==="object") && 
        (obj.nodeType===1) && 
        (typeof obj.style === "object") &&
        (typeof obj.ownerDocument ==="object");
      }
  },

  debounce:function(func, delay){
    var timeout = null;
    return function(){
      var context = this;
      var args = arguments;
      clearTimeout(timeout);
      timeout = setTimeout(function(){
        func.apply(context, args);
      }, delay);
    };
  }
};


Object.freeze(utils);
export default utils;