clear method
      
void
clear()
      
     
    
Removes all subscriptions
Implementation
void clear() {
  final subscriptionIds = List<String>.from(_subscriptions.keys);
  for (final id in subscriptionIds) {
    removeSubscription(id);
  }
}Removes all subscriptions
void clear() {
  final subscriptionIds = List<String>.from(_subscriptions.keys);
  for (final id in subscriptionIds) {
    removeSubscription(id);
  }
}