全局变量未显示在webpack中

Question

当我使用webpack时，我的全局变量无效。知道为什么吗？

var s = {
  name : 'Goku',
  fn : function(){
    return this.fn2.bind(window)();
  },
  fn2 : function(){
    return this.x;
  }

};

var x = 45;
console.log(s.name);
console.log(s.fn());  should say 45 since it's rebinded. getting undefined