MusicService.emit() broken in bridgeless mode (New Architecture) — all native-to-JS events silently dropped

[bil9148]

Describe the Bug

MusicService.emit() and emitList() hardcode the legacy reactNativeHost.reactInstanceManager.currentReactContext chain to send events to JS. In bridgeless mode (RN 0.76+, New Architecture), currentReactContext returns null because the real context lives in ReactHost, not ReactInstanceManager. The ?. safe-call chain silently no-ops, so every event from the native service to JS is dropped — playback state, track changes, remote media controls, progress, metadata, errors.

Audio plays fine and the notification appears (ExoPlayer runs natively), but no JS event handler ever fires. Notification play/pause/seek/next/previous all do nothing. No crash, no log, no warning.

Likely the same underlying cause as #2543.

Steps To Reproduce

1. Create a project with newArchEnabled: true (default for new Expo projects since SDK 51)
2. Set up RNTP with a PlaybackService that registers Event.RemotePlay, Event.RemotePause, etc.
3. Play a track
4. Tap any notification control — nothing happens

Root Cause

MusicService.kt lines 743-757:

@MainThread
private fun emit(event: String, data: Bundle? = null) {
    reactNativeHost.reactInstanceManager.currentReactContext
        ?.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter::class.java)
        ?.emit(event, data?.let { Arguments.fromBundle(it) })
}

MusicService extends HeadlessJsTaskService, which already provides a reactContext property that branches correctly between bridged and bridgeless:

// HeadlessJsTaskService (RN core)
protected val reactContext: ReactContext?
    get() {
      if (ReactNativeNewArchitectureFeatureFlags.enableBridgelessArchitecture()) {
        return checkNotNull(reactHost) { ... }.currentReactContext
      } else {
        return reactNativeHost.reactInstanceManager.currentReactContext
      }
    }

RNTP bypasses this and hardcodes the legacy path.

Fix

Use the inherited reactContext instead of the hardcoded chain in both emit() and emitList():

@MainThread
private fun emit(event: String, data: Bundle? = null) {
    reactContext
        ?.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter::class.java)
        ?.emit(event, data?.let { Arguments.fromBundle(it) })
}

@MainThread
private fun emitList(event: String, data: List<Bundle> = emptyList()) {
    val payload = Arguments.createArray()
    data.forEach { payload.pushMap(Arguments.fromBundle(it)) }

    reactContext
        ?.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter::class.java)
        ?.emit(event, payload)
}

Two lines changed. Tested and working.

Environment Info

• react-native-track-player: 4.1.2
• react-native: 0.81.5
• Expo SDK: 54
• newArchEnabled: true (bridgeless mode)
• Android 15, physical device

Replicable on Example App?

Haven't tested the example app, but any app with newArchEnabled: true should hit this — the code path is unconditional.

How I can Help

Happy to open a PR with this fix if you want.

[lovegaoshi]

i dont think u r looking at main. main's emit is already what ur proposing.