Dart APIunself_appAnalyticRouteObservernameExtractor nameExtractor property Null safety ScreenNameExtractor nameExtractor final Implementation final ScreenNameExtractor nameExtractor; unself_app unself_app AnalyticRouteObserver nameExtractor property AnalyticRouteObserver class Constructors AnalyticRouteObserver Properties analytic hashCode nameExtractor navigator routeFilter runtimeType Methods debugObservingRoute didPop didPush didRemove didReplace didStartUserGesture didStopUserGesture noSuchMethod subscribe toString unsubscribe Operators operator == Static methods defaultNameExtractor defaultRouteFilter