JSFiddle - React, Tailwind, and code Playground

HTML

<script>
    function getOwnPropertyDescriptors(object) {
    var keys = Object.getOwnPropertyNames(object),
        returnObj = {};

    keys.forEach(getPropertyDescriptor);

    return returnObj;

    function getPropertyDescriptor(key) {
        var pd = Object.getOwnPropertyDescriptor(object, key);
        returnObj[key] = pd;
    }
}
Object.getOwnPropertyDescriptors = getOwnPropertyDescriptors;

</script>


<script>
function dup(o) {
    return Object.create(
        Object.getPrototypeOf(o),
        Object.getOwnPropertyDescriptors(o)
    );
}

</script>

JavaScript

var Animal, Cat, cat, cat2, dup;
var __hasProp = Object.prototype.hasOwnProperty, __extends = function(child, parent) {
  for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; }
  function ctor() { this.constructor = child; }
  ctor.prototype = parent.prototype;
  child.prototype = new ctor;
  child.__super__ = parent.prototype;
  return child;
};
Animal = (function() {
  function Animal() {}
  Animal.sleep = function() {
    return console.log('sleep');
  };
  Animal.prototype.wake = function() {
    return console.log('wake');
  };
  return Animal;
})();

Cat = (function() {
  __extends(Cat, Animal);
  function Cat() {
    Cat.__super__.constructor.apply(this, arguments);
    console.log('create');
  }
  Cat.prototype.attack = function() {
    return console.log('attack');
  };
  return Cat;
})();

cat = new Cat();
cat.constructor.sleep();
cat.wake();
cat.attack();

cat2 = dup(cat);
cat2.constructor.sleep();
cat2.wake();
cat2.attack();