Constructor Function Proxies

Constructor.js

/**
 * A convenience method to create a proper Constructor Function
 * implemented as a function proxy
 */
Proxy.createConstructor = function(handler, callTrap) {
  var proto = new Object();
  var ctor = Proxy.createFunction(
    handler,
    callTrap,
    function() {
      var instance = Object.create(proto);
      var result = // callTrap.apply(instance, arguments);
        Function.prototype.apply.call(callTrap, instance, arguments);
      if (Object(result) === result) {
        return result;
      } else {
        return instance;
      }
    });
  Object.defineProperty(proto, "constructor", {
    value: ctor,
    writable: true,
    enumerable: false,
    configurable: true });
  Object.defineProperty(ctor, "prototype", {
    value: proto,
    writable: true,
    enumerable: false,
    configurable: false });
  Object.defineProperty(ctor, "length", {
    value: callTrap.length,
    writable: false,
    enumerable: false,
    configurable: false });
  return ctor;
}