react-native-firebase/docs/core/app.md

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# App - firebase.app(): FirebaseApp
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RNFirebase supports both initializing apps natively and also via js code over the RN bridge.
Apps initialized natively are available immediately at app runtime, there is no need to call `initializeApp` for them.
For example, to access the default app initialized via the `Google-Services` `plist` or `json` file:
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```js
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import firebase from 'react-native-firebase';
const defaultApp = firebase.app();
defaultApp.database().ref('foobar').once('value', (snapshot) => {
// snapshot from default app
});
// get the default app name/options that were initialized natively
console.log("name", defaultApp.name);
console.log("apiKey", defaultApp.options.apiKey);
console.log("applicationId", defaultApp.options.applicationId);
console.log("databaseUrl", defaultApp.options.databaseUrl);
console.log("messagingSenderId", defaultApp.options.messagingSenderId);
console.log("projectId", defaultApp.options.projectId);
console.log("storageBucket", defaultApp.options.projectId);
```
<!-- TODO api ref docs: -->
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<!-- - name: String -->
<!-- - options: Object -->
<!-- - delete(): Promise -->
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