refactor(installations)!: migrate to TypeScript

[russellwheatley]

Updated to main and re-pushed to verify things still work since we're not using a merge queue here

release notes will come from the commit, so here's the draft of the commit message pulled from the description:

---

BREAKING CHANGE: installations modular types now match firebase-js-sdk

Please see https://rnfirebase.io/migrating-to-v25 for help migrating if needed.

react-native-firebase has a goal to be a drop-in replacement for firebase-js-sdk, with native extensions and performance. It has always worked that way at the javascript level but the typescript types have been divergent.

We are fixing that as we refactor to typescript. Please bear with us as we get closer to our goal of react-native-firebase matching firebase-js-sdk both in functionality where possible, but also in exact typescript typing.

Specifics for Installations:

• changed modular getInstallations() to return the firebase-js-sdk-style Installations type, which only exposes app; TypeScript consumers should use the modular helpers getId(installations), getToken(installations), and deleteInstallations(installations) instead of calling .getId(), .getToken(), or .delete() on the returned instance.
• changed modular deleteInstallations(installations) so the installations argument is required in the TypeScript surface, matching firebase-js-sdk. Code that previously relied on the old optional typing should pass getInstallations() explicitly.
• preserved the namespaced API surface: installations(), firebase.installations(), firebase.app().installations(), and FirebaseInstallationsTypes.Module remain available for compatibility, with deprecation annotations added.
• added explicit modular public types including Installations, IdChangeCallbackFn, and IdChangeUnsubscribeFn.

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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[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 completes the migration of the installations package to TypeScript. It updates the build configuration to use modern standards, improves type definitions, and refactors the internal module structure to align with the project's modular API strategy while ensuring existing consumers remain supported.

Highlights

• TypeScript Migration: Migrated the installations package to TypeScript, improving type safety and developer experience.
• Build System Update: Integrated react-native-builder-bob for improved build processes and package exports.
• API Refactoring: Refactored the internal structure to better support modular and namespaced APIs, while maintaining backward compatibility.

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[gemini-code-assist]

Code Review

This pull request transitions the Firebase Installations package to a modular architecture, adding modular API functions and updating the build process with react-native-builder-bob. It also includes comprehensive type definitions and consistency check configurations. Feedback focuses on simplifying the implementation of getInstallations and getToken by utilizing optional chaining and boolean conversion to eliminate redundant conditional logic.