Describe your environment

• Operating System version: React Native 0.59
• Browser version: iOS, Android
• Firebase SDK version: 6.1.0
• Firebase Product: auth

Describe the problem

When using Firebase on React Native, it uses AsyncStorage from react-native under the hood to store the authentication session across app restarts. Starting from RN0.59 AsyncStorage is deprecated from react-native and moved into its own package react-native-async-storage.

Steps to reproduce:

Add Firebase to React Native app and observe how at the startup there's a warning:

[warn][tid:com.facebook.react.JavaScript] Warning: Async Storage has been extracted from react-native core and will be removed in a future release. It can now be installed and imported from '@react-native-community/async-storage' instead of 'react-native'. See https://github.com/react-native-community/react-native-async-storage

Relevant Code: