convert a Stream<QuerySnapshot<Map<String, dynamic>>> to a List?

this is a piece of my code. i want to fecth all users except the current-user from the firestore collections. but i got this error(The argument type 'QueryDocumentSnapshot<Object?>' can't be assigned to the parameter type 'Map<String, dynamic>'). Here it's underline in red: querySnapshot.docs[i].data()

 Future <List<kako.User>> fetchAllUsers(User currentUser) async{
 List<kako.User> userList =  List<kako.User>.generate(20, (index)=>kako.User());
    QuerySnapshot querySnapshot =await fireStore.collection("users").get();
       for (var i = 0; i < querySnapshot.docs.length ; i++) {
           if(querySnapshot.docs[i].id != currentUser.uid){
           userList.add(kako.User.fromMap(querySnapshot.docs[i].data()));
         }
    }
return userList;

}