chore: Allow type-safety for subcollections

[fivecar]

Description

Root collections currently allow strong typing:

const allYourBase = firestore()
  .collection<SetUsUp>("are-belong")
  .get();

But subcollections cannot be typed:

const allYourBase = firestore()
  .collection<SetUsUp>("are-belong")
  .doc("8675309")
  .collection<TheBomb>("to-us")  // This is not accepted by index.d.ts
  .get();

This PR attempts to make that possible.

Release Summary

Support strong typing for subcollections

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

Installed local version in my project, and verified that Typescript accepts a subcollection type.

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 26, 2025 10:23pm