Is it possible to transform an argument of type QuerySnapshot<Object?> into an argument of type AsyncSnapshot<QuerySnapshot<Map<String, dynamic>>>?

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Yes, it is possible to transform an argument of type QuerySnapshot<Object?> into an argument of type AsyncSnapshot<QuerySnapshot<Map<String, dynamic>>>.

You can create a StreamBuilder or FutureBuilder widget that takes an argument of type QuerySnapshot<Object?> and returns an AsyncSnapshot<QuerySnapshot<Map<String, dynamic>>> by mapping the QuerySnapshot<Object?> to QuerySnapshot<Map<String, dynamic>>.

Here's an example of how to do it:

StreamBuilder<QuerySnapshot<Object?>>(
  stream: Firestore.instance.collection('users').snapshots(),
  builder: (context, snapshot) {
    if (!snapshot.hasData) {
      return Center(child: CircularProgressIndicator());
    }
    return SomeWidget(
      snapshot: AsyncSnapshot<QuerySnapshot<Map<String, dynamic>>>(
          ConnectionState.active,
          snapshot: snapshot.data!.map((doc) =>
              QueryDocumentSnapshot<Map<String, dynamic>>.fromMap(doc.data() as Map<String, dynamic>))
              as QuerySnapshot<Map<String, dynamic>>
          ),
      ),
    );
  },
);

In the above example, the StreamBuilder takes an argument of type QuerySnapshot<Object?> and returns an AsyncSnapshot<QuerySnapshot<Map<String, dynamic>>> by mapping each document in the snapshot to a QueryDocumentSnapshot<Map<String, dynamic>>.