navigatorObservers property
The list of observers for the Navigator created for this app.
This list must be replaced by a list of newly-created observers if the
navigatorKey
is changed.
The Navigator is only built if routes are provided (either via home,
routes, onGenerateRoute, or onUnknownRoute); if they are not,
navigatorObservers must be the empty list and builder
must not be null.
Implementation
final List<NavigatorObserver> navigatorObservers;