在返回 FirebaseFirestore QuerySnapshot 时使用 async* 和 yield* 有什么区别吗

Question

Is there any difference between the first case and the second case?

1.

Stream<QuerySnapshot> streamUsersOne() async* {
  yield* FirebaseFirestore.instance.collection('users').snapshots();
}

2.

Stream<QuerySnapshot> streamUsersTwo() {
  return FirebaseFirestore.instance.collection('users').snapshots();
}

Answer 1

This first one(async* and yield) is used when you are creating your own Stream and it has no need to use it here because the snapshots method has already return type of Stream. you can watch this clip to learn more about how to create a stream.