I am trying to parse out the structure of the React-Native F8 app from Facebook for iOS. 

The index.ios.js looks like this:

```
'use strict';

const {AppRegistry} = require('react-native');
const setup = require('./js/setup');

AppRegistry.registerComponent('F8v2', setup);

```

I understand and can find the set up file. But what is 'F8v2' in this instance? Is this in reference to a folder? Is this in reference to a component (if so, I cannot find it in the app).