bindNotifier method
Implementation
void bindNotifier(BtNotifier<T> notifier) {
if (!_subscriptions.containsKey(notifier)) {
BtSubscription<T> sub = notifier.listen((data) {
// call the method the _stream listened ever
_stream.update(data);
});
(_subscriptions[notifier] ??= <BtSubscription<T>>[]).add(sub);
}
}