feat(auth): add support for fullName when using Sign in with Apple

[andrewdollard]

Description

Adds the ability to set the user's full name when using Sign In With Apple.

When signing in with Apple using e.g. react-native-apple-authentication, Apple provides a fullName value which must be displayed in the app; furthermore, Apple provides this data only on initial sign-up and not on subsequent sign-ins.

firebase-ios-sdk supports setting that value when signing in via Firebase with an Apple credential; however, react-native-firebase does not currently provide a way to pass the fullName value to the underlying Firebase native code. As a result, using Sign In With Apple requires storing the user's name data in the app instead of in Firebase as with other social auth providers.

This PR adds a signInWithAppleCredential method to the auth module, which passes the fullName value to appleCredentialWithIDToken in the Firebase iOS SDK so it can be forwarded to Firebase on sign-up.

Notes:

• AppleAuthProvider.credential is extended to take an optional fullName parameter
• signInWithAppleCredential accepts a credential with or without the fullName property
• The behavior of the existing signInWithCredential method is unchanged

This feature is iOS only; AFAICT this functionality is already handled by the Firebase Android SDK (docs).

Related issues

Fixes #7603

Release Summary

Adds ability to set fullName when using Sign In With Apple

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

I wasn't able to add e2e tests as the Firebase emulator doesn't support social auth, but I am running it in my own app:

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2025 5:34pm

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