FirebaseCore

expo-firebase-core provides access to the Firebase configuration and performs initialisation of the native Firebase App.

Platform Compatibility

Android Device	Android Emulator	iOS Device	iOS Simulator	Web

Installation

Terminal

→ npx expo install expo-firebase-core

If you're installing this in a bare React Native app, you should also follow these additional installation instructions.

Configuration

To use this package, Firebase needs to be configured for your app. Please follow this guide on how to configure native Firebase.

No explicit calls to expo-firebase-core are required to initialize Firebase. This library will auto-initialize the Firebase app when a valid configuration exists.

Native Firebase packages

At the moment, only Firebase Analytics is supported natively. We are working on bringing more native Firebase packages to Expo, stay tuned :)

expo-firebase-analytics

API

import * as FirebaseCore from 'expo-firebase-core';

Constants

`FirebaseCore.DEFAULT_APP_NAME`

Type: string | void

Name of the default Firebase app (e.g. [DEFAULT]).

In Expo Go, a Firebase App is created for each project that is loaded, and a unique name for each project is returned.

`FirebaseCore.DEFAULT_APP_OPTIONS`

Type: FirebaseOptions | void

Firebase options with which the default app was initialized. If no Google services configuration was provided, undefined is returned.

Depending on the platform, the options are read from the following files and app.json keys.

Platform	File	App.json key
iOS	`GoogleService-Info.plist`	`ios.googleServicesFile`
Android	`google-services.json`	`android.googleServicesFile`
Web	-	`web.config.firebase`

Example

console.log(FirebaseCore.DEFAULT_APP_OPTIONS);
{
  appId: "1:1082251606918:ios:a2800bc715889446e24a07",
  apiKey: "AIzaXXXXXXXX-xxxxxxxxxxxxxxxxxxx",
  clientId: "000000000000-0000000000000.apps.googleusercontent.com",
  trackingId: 12345567890,
  databaseURL: "https://myexpoapp777.firebaseio.com",
  storageBucket:  "myexpoapp777.appspot.com",
  projectId: "myexpoapp777",
  messagingSenderId:  123454321
}

Name	Type	Description
apiKey (optional)	`string`	Firebase API key.
appId (optional)	`string`	Unique identifier of the Firebase app.
authDomain (optional)	`string`	-
databaseURL (optional)	`string`	Firebase database URL.
measurementId (optional)	`string`	-
messagingSenderId (optional)	`string`	-
projectId (optional)	`string`	Unique identifier of the Firebase project.
storageBucket (optional)	`string`	Google Cloud Storage bucket name.
trackingId (optional)	`string`	Tracking identifier for Google Analytics.