[joker-777]

React Native 0.88 removed RCTCxxBridge (and its declaration in RCTBridge+Private.h), so JSIInstaller.h/.mm and WMDatabaseBridge.m no longer compile. AGP 9 (Expo SDK 54+) stops generating BuildConfig for library modules and ships its own Kotlin support, which fails when a module also applies kotlin-android.

iOS

• installWatermelonJSI takes a plain RCTBridge * and declares the -runtime selector in a category. Both the legacy RCTCxxBridge and the bridgeless RCTBridgeProxy respond to it, so JSI installs on the bridge and in bridgeless mode alike. No behaviour change on React Native < 0.88.

Android

• buildFeatures { buildConfig true }: the Java sources read BuildConfig.DEBUG.
• The module has had no Kotlin sources since the Java rewrite, so the kotlin-android plugin, its classpath entry and the stdlib dependency are removed. This is the same conflict fix(android): skip explicit Kotlin plugin when AGP registers the kotlin extension Nozbe/WatermelonDB#1974 guards against; removing the plugin removes the cause.

Tested

• The iOS change is the patch Kenhub has shipped in production builds on Expo SDK 58 / React Native 0.88.1 (new architecture, jsi: false, and the installer path compiles and runs with jsi: true as well).
• The buildConfig line is what we previously injected from an Expo config plugin for the same builds.
• yarn ci:check suites for the touched JS areas pass; this PR changes no JavaScript.

Fixes Nozbe#1969, fixes Nozbe#1974 (same root cause), related to Nozbe#1769.

Also opened upstream as Nozbe#1978.

[Copilot]

🟢 Approval recommended

No active review issues remain for the React Native 0.88 and Android Gradle Plugin 9 compatibility updates.

No open issues 🎉

What changed in this PR

Updates WatermelonDB’s native integration for React Native 0.88 and Android Gradle Plugin 9 compatibility.

Changes:

• Replaces iOS installer references to RCTCxxBridge with RCTBridge and declares the runtime selector for legacy bridges and bridgeless proxies.
• Explicitly enables Android BuildConfig generation and removes the unused Kotlin plugin, dependency, and version property.
• Documents the compatibility fixes in the unreleased changelog.

File	Description
native/​ios/​WatermelonDB/​objc/​WMDatabaseBridge.m	Passes RCTBridge to the JSI installer without the removed bridge type cast.
native/​ios/​WatermelonDB/​JSIInstaller.mm	Updates the installer type and declares the runtime selector.
native/​ios/​WatermelonDB/​JSIInstaller.h	Uses the public bridge header and updates the installer signature.
native/​android/​gradle.properties	Removes the unused Kotlin version property.
native/​android/​build.gradle	Enables BuildConfig and removes Kotlin build configuration.
CHANGELOG-Unreleased.md	Records the iOS and Android compatibility fixes.

_{Review effort: Balanced}

[joker-777]

Superseded by #9, the same commit rebuilt on the current kenhub (only the changelog conflicted). The branch stays as the head of the upstream PR Nozbe#1978.