Expo FirebaseCore
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Deprecated: This module will no longer be available in SDK 48. Learn how to migrate to React Native Firebase.

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

You do not have to install this library directly in your project to use Firebase. It is used as a peer dependency for the expo-firebase-analytics module when used with React Native Firebase.

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.

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
}

`FirebaseCore.DEFAULT_WEB_APP_OPTIONS`

Type: FirebaseOptions | void

The default Firebase options as defined in web.config.firebase in app.json.

Types

`FirebaseOptions`

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.