无法连接到开发服务器

Question

版本细节：

 react-native : 0.21.0   
 npm: '3.3.6',   
 node: '5.0.0'
 watchman : 4.4.0

当我试图在iOS模拟器中运行我的应用程序时，转换正在挂起..

[2:53:33 PM] <START> transform transforming [========================================] 100% 508/509

我在模拟器中看到红色错误屏幕，消息为Could not connect to development server..

修改：

    [5:15:30 PM] transforming [=======] 100% 507/509transforming:  /projects/mobile-examples/index.ios.js
    transforming [========================================] 100% 508/509
    transforming [========================================] 100% 509/509
    [5:35:42 PM] <END>   transform (1402427ms)
    it took 20 min to transform 

看起来像变换问题，任何想法为什么花了这么多时间？

EDIT2：

将我的节点和npm降级到4.0.0和2.x，变压器现在更快了:)