Proof
No visual proof cases have been published for this package yet. The registry summary below describes what the compat layer implements.expo-hardware-buttons
native-seam only — upstream Expo module export and event types run from the bundle; HardwareButtons reports volume buttons present, no camera button, and accepts camera-button attach/detach55%
API coverageWorking (4)
getCapabilitiesAsyncattachCameraButtondetachCameraButtonlistener subscription shape
Missing
no hardware button event stream from the host OS