@interface HKFeatureAvailabilityRequirementSatisfactionOverridesDataSource : HKUserDefaultsDataSource + (id)requirementSatisfactionOverridesDataSource; - (void)registerObserver:(id)a0 forFeature:(id)a1 requirement:(id)a2 newValueHandler:(id /* block */)a3; - (void)unregisterObserver:(id)a0 forFeature:(id)a1 requirement:(id)a2; @end