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[docs] update usage

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Salakar 2017-08-26 06:04:17 +01:00
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After creating a Firebase project and installing the library, we can use it in our project by importing the library in our JavaScript:
```javascript
import RNFirebase from 'react-native-firebase'
import firebase from 'react-native-firebase';
```
We need to tell the Firebase library we want to _configure_ the project. RNFirebase provides a way to configure both the native and the JavaScript side of the project at the same time with a single command:
As the default app is pre-initialized natively there is no need to call `initializeApp` for the default app instance. Just import and go:
```javascript
const firebase = RNFirebase.initializeApp({
// config options
import firebase from 'react-native-firebase';
firebase.auth().signInAnonymously()
.then((user) => {
console.log(user.isAnonymous);
});
```
## Configuration Options
### Configure Default App Instance
| option | type | Default Value | Description |
|----------------|----------|-------------------------|----------------------------------------|
| debug | bool | false | When set to true, RNFirebase will log messages to the console and fire `debug` events we can listen to in `js` |
| persistence | bool | false | When set to true, database persistence will be enabled. |
| errorOnMissingPlayServices | bool | true | (Android only) When set to true, will throw an error if Google Play Services isn't installed. |
| promptOnMissingPlayServices | bool | true | (Android only) When set to true, will prompt the user to install Google Play Services if it isn't installed. This takes precedence over `errorOnMissingPlayServices`.|
<!-- TODO document elsewhere and place a 'See X link' here-->
For instance:
### Configuring RNFirebase
```javascript
import RNFirebase from 'react-native-firebase';
<!-- TODO document elsewhere and place a 'See X link' here-->
const configurationOptions = {
debug: true
};
const firebase = RNFirebase.initializeApp(configurationOptions);
export default firebase;
```