offNamedUntil<T>  abstract method 
Implementation
Future<T?>? offNamedUntil<T>(
  String page, {
  bool Function(FlowerPage route)? predicate,
  dynamic arguments,
  int? id,
  Map<String, String>? parameters,
});Future<T?>? offNamedUntil<T>(
  String page, {
  bool Function(FlowerPage route)? predicate,
  dynamic arguments,
  int? id,
  Map<String, String>? parameters,
});