Update extension_navigation.dart

@@ -1055,6 +1055,19 @@ you can only use widgets and widget functions here''';
     return _key;
     return _key;
   }
   }
   
   
+   /// Casts the stored router delegate to a desired type
+  TDelegate? delegate<TDelegate extends RouterDelegate<TPage>, TPage>() =>
+      _routerDelegate as TDelegate?;
+
+  static RouterDelegate? _routerDelegate;
+
+  // ignore: use_setters_to_change_properties
+  void setDefaultDelegate(RouterDelegate? delegate) {
+    _routerDelegate = delegate;
+  }
+
+  GetDelegate? getDelegate() => delegate<GetDelegate, GetNavConfig>();
+
   /// give current arguments
   /// give current arguments
   dynamic get arguments => routing.args;
   dynamic get arguments => routing.args;