feat(firestore): add support for onSnapshotsInSync

Description

Currently the firebase-js-sdk has an onSnapshotsInSync API and react-native-firebase does not

This PR (when complete) will close that feature gap)

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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@mikehardy, it's a feature. onSnapshotsInSync is not supported in RNFB, both in the JS and natively. This PR is not complete.

Ah, thanks. I updated the description to match in case I take a peek again

Hello 👋, this PR has been opened for more than 2 months with no activity on it.

If you think this is a mistake please comment and ping a maintainer to get this merged ASAP! Thanks for contributing!

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 9, 2025 0:10am

@MichaelVerdon - I've updated so it works on android. Setup a test app for onSnapshotInSync.

You will need to update the path to point towards it here: https://github.com/invertase/react-native-firebase/blob/feat-add-onSnapshotsInSync-support/tests/test-app/index.js#L6

To run the example test app, run these scripts: https://github.com/invertase/react-native-firebase/blob/feat-add-onSnapshotsInSync-support/package.json#L56-L58

Remember to have the emulator or simulator running depending on if you're running android or iOS.