the grossest thing i've written in a long time

gistfile1.js

/**
  * Adds aliases to any Object so that they can be used more semantically in code
  *
  * @method Phaser.Utils#propertyAlias
  * @param {propetyName} obj - The object to add an alias to
  * @param {string} [propertyName] - the current property name to alias
  * @param {string} [aliasName] - the alias
  * @static
  * @example
  * Phaser.Utils.propertyAlias(Phaser.Point.prototype, 'x', 'width');
  * Phaser.Utils.propertyAlias(Phaser.Point.prototype, 'y', 'height');
  * var dimensions = new Phaser.Point(10,20);
  * console.log(dimensions.width, dimensions.height); // 10 20;
  */

  Phaser.Utils.propertyAlias = function(obj, propertyName, aliasName) {
      if(obj[aliasName]) {
        throw new Error('object already has a property named', aliasName);
      } else {
        Object.defineProperty(obj, aliasName, {
          get: function() {
            return this[propertyName];
          },
          set: function(val) {
            this[propertyName] = val;
          }
        });
      }
  };