AngularFire: get the isNewUser flag;

I need to get hold of the 'additionalUserInfo.isNewUser'.

import { User, getAdditionalUserInfo, getAuth, user, UserCredential } from '@angular/fire/auth';

afAuth = getAuth();

user$: Observable<User | null> = user(this.afAuth);

userSubscription = this.user$
.pipe(
switchMap(firebaseUser => {

if (!firebaseUser) return of(null);

return from(firebaseUser.getIdTokenResult())
.pipe(
map(idTokenResult => {
// ... map claims from token to user object;
return userWithClaims;
}),

//TODO: I need the 'additionalUserInfo.isNewUser' here
);
}),
...


AngularFire provides the 'UserCredential' interface and the 'getAdditionalUserInfo' method,
but I don't know where to get the 'userCredential' object from.

getAdditionalUserInfo(userCredential: UserCredential) { ... }


I wasn't able to find anything helpful in the "Convenience observables" section.

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