proxy.js

var Toto = function() {
};

Toto.prototype.test = function() {
};

var wrappedClass = new Proxy(Toto, {
  get : function(o, method_name) {
    console.log(o, method_name);
    return function() {
      console.log('Alright');
    }
  }
});

wrappedClass.yes();