import firebase from 'react-native-firebase';

const defaultApp = firebase.app();

defaultApp.auth().signInAnonymously().then((user) => {
  console.log('defaultApp user ->', user.toJSON());
});

// as you can see there's no need to call initializeApp for apps that have been
// initialized natively via google-services plist/json files, all natively initialized apps
// are available immediately at app run time, even if you natively initialized more apps.

// for backwards compatibility you can still call `initializeApp` for the default app - it just internally ignores initialization.

import firebase from 'react-native-firebase';

// get the default app name/options that were initialized natively
console.log("name", firebase.app().name);
console.log("apiKey", firebase.app().options.apiKey);
console.log("applicationId", firebase.app().options.appId);
console.log("databaseUrl", firebase.app().options.databaseURL);
console.log("messagingSenderId", firebase.app().options.messagingSenderId);
console.log("projectId", firebase.app().options.projectId);
console.log("storageBucket", firebase.app().options.storageBucket);

import firebase from 'react-native-firebase';

const yourAppConfig = {
  clientId: 'x',
  appId: 'x',
  apiKey: 'x',
  databaseURL: 'x',
  storageBucket: 'x',
  messagingSenderId: 'x',
  projectId: 'x',
};

const anotherApp = firebase.initializeApp(yourAppConfig, 'anotherApp');

// dynamically created apps aren't available immediately due to the
// the way the react native environment works, therefore you must
// wait for an `onReady` state before calling any modules/methods
// otherwise you will most likely run into `app not initialized` exceptions
anotherApp.onReady().then((app) => {
   // --- ready ---
   // use `app` or `anotherApp` to access modules and methods
   // or you can also do:
   firebase.app('anotherApp').auth().signInAnonymously().then((user) => {
       console.log('defaultApp user ->', user.toJSON());
   });
});

import firebase from 'react-native-firebase';

const defaultApp = firebase.app();

defaultApp.auth().signInAnonymously().then((user) => {
  console.log('defaultApp user ->', user.toJSON());
});

// as you can see there's no need to call initializeApp for apps that have been
// initialized natively via google-services plist/json files, all natively initialized apps
// are available immediately at app run time, even if you natively initialized more apps.

// for backwards compatibility you can still call `initializeApp` for the default app - it just internally ignores initialization.

import firebase from 'react-native-firebase';

// get the default app name/options that were initialized natively
console.log("name", firebase.app().name);
console.log("apiKey", firebase.app().options.apiKey);
console.log("applicationId", firebase.app().options.appId);
console.log("databaseUrl", firebase.app().options.databaseURL);
console.log("messagingSenderId", firebase.app().options.messagingSenderId);
console.log("projectId", firebase.app().options.projectId);
console.log("storageBucket", firebase.app().options.storageBucket);

import firebase from 'react-native-firebase';

const yourAppConfig = {
  clientId: 'x',
  appId: 'x',
  apiKey: 'x',
  databaseURL: 'x',
  storageBucket: 'x',
  messagingSenderId: 'x',
  projectId: 'x',
};

const anotherApp = firebase.initializeApp(yourAppConfig, 'anotherApp');

// dynamically created apps aren't available immediately due to the
// the way the react native environment works, therefore you must
// wait for an `onReady` state before calling any modules/methods
// otherwise you will most likely run into `app not initialized` exceptions
anotherApp.onReady().then((app) => {
   // --- ready ---
   // use `app` or `anotherApp` to access modules and methods
   // or you can also do:
   firebase.app('anotherApp').auth().signInAnonymously().then((user) => {
       console.log('defaultApp user ->', user.toJSON());
   });
});