Proxy internal state API

proxyInternalStateAPI.js

Proxy.ForwardingHandler.prototype = {
  create: function(target) {return {target: target}},
  getPrototypeOf: function (proxy, state) {
    return Object.getPrototypeOf(state.target);
  }
  // all other traps take state argument
};

// ... //

var target = {}, h = new Proxy.ForwardingHandler, P = Proxy.Constructor(h), p = P(target);

// changing one trap
h.set = function(...args){
  console.log("New set trap in forwarding proxy. Property name: " + args[1]);
  Proxy.ForwardingHandler.set.apply(this, args);
};

// ... //

p.ProxiesAreAwesome = 42;
// logs: "New set trap in forwarding proxy. Property name: ProxiesAreAwesome"
target.ProxiesAreAwesome; // 42. Forwarding went well too