refactor(remote-config)!: migrate to TypeScript

[russellwheatley]

Description

Breaking Changes

• breaking: the primary modular remote-config types now use Firebase JS SDK names: LogLevel, FetchStatus, Value, and RemoteConfigSettings. types/remote-config.ts#L21-L37

• breaking: RemoteConfig.settings is now typed as RemoteConfigSettings, which uses fetchTimeoutMillis rather than the older RNFB-style fetchTimeMillis on the modular surface. types/remote-config.ts#L34-L37 types/remote-config.ts#L55-L63

• breaking: modular getAll() and getValue() now return SDK-aligned types: Record<string, Value> and Value. modular.ts#L91-L123

• breaking: modular setLogLevel() now matches the Firebase JS SDK signature and returns void. modular.ts#L126-L133

• breaking: the legacy modular helper exports fetchTimeMillis(), settings(), and lastFetchStatus() have been removed from @react-native-firebase/remote-config. Modular callers should read remoteConfig.fetchTimeMillis, remoteConfig.settings, and remoteConfig.lastFetchStatus from the RemoteConfig instance instead. types/remote-config.ts#L55-L63

• breaking: modular fetch() has been removed. Modular callers should use fetchConfig(remoteConfig) instead; the RNFB-only modular expirationDurationSeconds helper is no longer part of the public modular API. modular.ts#L81-L86

• breaking: modular setConfigSettings() and setDefaults() have been removed. Modular callers should use remoteConfig.settings = ... and remoteConfig.defaultConfig = ... on the RemoteConfig instance instead. types/remote-config.ts#L55-L63

• breaking: modular onConfigUpdated() has been removed. Modular callers should use onConfigUpdate(remoteConfig, observer) instead. modular.ts#L165-L174 types/remote-config.ts#L39-L49

• breaking: deprecated RemoteConfigValue.value and .source getters have been removed. Callers should use asString() and getSource() instead. 69ffd4c

• breaking - Remove LastFetchStatus, ValueSource, ConfigSettings, ConfigDefaults, ConfigValue, ConfigValues, LastFetchStatusType, and RemoteConfigLogLevel from modular exports f22f19b

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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Project	Deployment	Actions	Updated (UTC)
react-native-firebase	Error		Apr 17, 2026 11:12am

[gemini-code-assist]

Code Review

This pull request refactors the Remote Config package to use TypeScript and aligns its structure with the modular API of the Firebase JS SDK. Key changes include the introduction of comprehensive type definitions for internal, namespaced, and modular APIs, the implementation of modular API functions, and the adoption of react-native-builder-bob for the build process. Feedback was provided regarding the reset method implementation on iOS, suggesting a cleaner way to resolve the promise.