firebase/auth updateProfil reset

[boringContributor]

I implemented an application with basic firebase auth operations (email, password).

I allow the user to upload a profile picture to firebase storage and link this with the firebase auth user data as I don't want to store it in firestore.

Now comes the problem. When I want to implement a functionality to allow the user to remove its profile picture, I can't "reset" the user auth data. Basically what I want to do is:

  await updateProfile(auth.currentUser, { photoURL: null })

to "reset" the photoURL to its initial state. Neither null nor undefined nor empty "" string is working. I checked the implementation and Im curious why undefined is not allowed here?
What would be an approach here?

firebase-js-sdk/packages/auth/src/core/user/account_info.ts

Line 45 in acc5810

if (displayName === undefined && photoUrl === undefined) {

Payload looks like this

while the response is this