Firebase createUser and signIn gives warnings in console - react-native

Question

I was building a login cum signup screen in react-native where it takes email and password from the user and tries to signin using the firebase call

firebase.auth().signInWithEmailAndPassword(email, password)

and if it fails to login then I create a new account for the user using the call

firebase.auth().createUserWithEmailAndPassword(email, password)

When I run the app on emulator and try to sign in it works fine but I get a yellow box warning saying

Deprecated firebase.User.prototype.signInWithEmailAndPassword in favor of firebase.User.prototype.signInAndRetrieveDataWithEmailAndPassword

I get a similar type of error for the createUser method. What difference will it make if I replace my methods with the ones suggested by the warnings?

Also I get a warning for the firebase initialization call which is firebase.initializeApp(config); saying

Deprecation: Calling 'InitializeApp()' for apps that are already initialised natively is unnecessary, use 'firebase.app()' instead to access the already initialized default app instance.

But when I actually change the initialization call to firebase.app(config) it throws me an error

TypeError: undefined is not a function.

For now, I have completely disabled the yellow box. Please let me know if there is any other workaround for this.

Answer 1

Please update to the latest firebase SDK version. Some of the sign-in method will be deprecated eventually. The warning is to let you switch to new APIs before it's deprecated so it won't break your app when we deprecated them.