feat(firebase-ai): create ai package, vertexai wraps around it

[russellwheatley]

Description

• Moved the bulk of code to new ai package. Kept relevant types in vertexai package and deprecated them.
• Updated implementation (where possible) to match firebase-js-sdk.
• Updated mocks to match latest implementation on vertexai-sdk-test-data repo which now segments responses from vertexai and googleai.
• I did attempt to symlink ai into vertexai but nested symlinks within directories were not being packaged in dist/ so opted to make ai package a dependency which I think is a better way of doing it.
• Created an ai example app for illustration and tested latest vertexai and ai implementations which surfaced a couple of subtle bugs that have been resolved.

Important

• We need to do the same attribution as we did for vertexai for this pull request.
• Double check what needs to be in the CHANGELOG for this release.

Related issues

Release Summary

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

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 10, 2025 0:05am