feat(auth): expose OAuth credential tokens in user credential result

[sagnik2001]

Related issues

Fixes #8316

Release Summary

Include OAuth credential token data on Auth UserCredential results.

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

Ran:

yarn tests:jest packages/auth/__tests__/auth.test.ts
yarn tsc:compile
yarn tsc:compile:consumer
yarn lint:js
yarn lint:ios:check
yarn reference:api
yarn compare:types
git diff --check

Also checked Android formatting for the touched Java file:

JAVA_HOME=/opt/homebrew/opt/openjdk PATH=/opt/homebrew/opt/openjdk/bin:$PATH ./node_modules/.bin/google-java-format --set-exit-if-changed --dry-run packages/auth/android/src/main/java/io/invertase/firebase/auth/ReactNativeFirebaseAuthModule.java

No e2e test was added because this change is covered at the bridge serialization/type level and a full OIDC runtime test requires provider configuration.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Firebase Auth module by ensuring that OAuth credential tokens, such as access tokens and ID tokens, are correctly passed from native platforms (Android and iOS) and the web implementation to the JavaScript layer. This change addresses a long-standing gap in the UserCredential result, enabling developers to access provider-specific tokens after successful authentication.

Highlights

• OAuth Credential Support: Added support for including OAuth credential tokens (accessToken, idToken, secret) in the Auth UserCredential result across Android, iOS, and Web platforms.
• TypeScript Definitions: Updated TypeScript type definitions to include the new OAuthCredential interface and updated the UserCredential interface to expose this information.
• Testing: Added unit tests in packages/auth/tests/auth.test.ts to verify that native auth results correctly serialize and include OAuth credential data.

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[gemini-code-assist]

Code Review

This pull request implements OAuth credential support in the UserCredential object for Android, iOS, and Web, enabling access to provider tokens and secrets. It includes updated TypeScript definitions, native mapping logic, and new tests. Reviewer feedback suggests using SharedUtils.mapPutValue on Android for cleaner code and applying consistent null handling for the provider ID on iOS to ensure safety across the React Native bridge.