Extending the Revealing Module Pattern – Why is this a bad idea?(invalid-arg.github.io)

  /** @private */
  MyClass.prototype.foo_ = function() {}

  var PseudoClass = function(_args){
      // guarantee that "this" is what we expect
      if( this === window ){ // use global for non-browser    implementations
         return new PseudoClass(_args);
      }
      // private variables are local
      var private = function() {;
             this.value = 2; 
          };
      // public variables are on prototype 
      this.constructor.prototype.value = 1; // I'd prolly use a local var and a getter for this
      this.constructor.prototype.public = function(){
          private.call(this); // force scope for private methods
      };
      // testing access (only added when necessary)
      this.constructor.prototype.privateMembers = {
          "private":function(){ private.call(this) }
      };
    };