`module.exports` isn't avaiable in the sandbox (sorry :/). you'll need to something like this
```javascript
// copies.index.js
di.copies = {};

// copies.pushmessage.js
di.copies.pushmessage = function($) {
  ...
};
```

You could also just do something like this to make your own `$` in this module, but its up to you if you prefer the current approach:
```javascript
var $ = new vumigo.translate.LazyTranslator();
```