Proof

@react-native-firebase/crashlytics

upstream @react-native-firebase/crashlytics JS runs unchanged against the NativeRNFBTurboCrashlytics (v26) and RNFBCrashlyticsModule native seam; collection reports disabled in a development bundle, as an iOS debug build does without crashlytics_debug_enabled
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 (12)
default callable exportgetCrashlyticsmodular helperscrashlogrecordErrorsetAttributesetAttributessetUserIdcollection enablementunsent report helpersdidCrashOnPreviousExecution
Missing (3)
native crash capturereport persistenceupload to Firebase Crashlytics; firebase.json and Info.plist configuration precedence is missing because RNFBApp does not receive those inputs; collection flags currently read persisted preferences and defaults