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[docs][core] default app additions

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Salakar 2017-10-05 03:03:49 +01:00
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docs/core/config-default-app.md
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<!-- TODO -->
### Default Firebase App
After following the iOS & Android install guides and correctly setting up your google services plist/json files; the default app is automatically initialized and available for use in react-native-firebase.
There's no need to call `initializeApp(opt)` in your JS code for the default app, import RNFirebase and use the default app straight away:
```javascript
import firebase from 'react-native-firebase';
console.log(firebase.database().app.name); // '[DEFAULT]'
```
!> Calling `initializeApp()` for the default app will throw an 'app already initialized' error in a later release.
### Enable Database Persistence