Proof

@react-native-firebase/app

upstream @react-native-firebase/app JS runs unchanged against a synthetic RNFBAppModule native app record
95%
API coverage
No visual proof cases have been published for this package yet. The registry summary below describes what the compat layer implements.
Working (7)
initializeAppgetAppgetAppsapp/apps default export shapedeletenative app registry constantspreferences/event listener native methods
Missing (2)
firebase.json and Info.plist configuration waterfall (FIREBASE_RAW_JSON/jsonGetAll/metaGetAll)UserDefaults global-domain keys in preferencesGetAll; native app options arrive through the bundle Firebase metadata