Future not waiting to resolve before next then Flutter Dart - flutter

Question

I'm trying to return a list of values.
Assessing by using Late
late List userLikes = userListLikes.getUsersLikes();
My Code:
class GetUserLikes {
final FirebaseFirestore _firestore = FirebaseFirestore.instance;
final user = FirebaseAuth.instance.currentUser!;
List getUsersLikes() {
try {
print('start');
final docRef = _firestore.collection("user_details").doc(user.uid);
docRef.get().then((DocumentSnapshot doc) async {
final data = doc.data() as Map<String, dynamic>;
print("data[user_likes]");
print(data['user_likes']);
print('end');
return await data['user_likes']; // → not awaiting
},
onError: (e) => print("Error getting document: $e"),
);
} catch (err) {
print('There was an error');
}
return ['Nothing Returned'];
}
}
The function is not completing and returns before the await has finished which is not the array I need.
start
[Nothing Returned] (Returns without completing)
data[user_likes]
[967, 769, 887, 820, 860, 833, 857, 1017] → The Array I want returned
end

Answer 1

As someone downvoted this answer here is the full working code:
This get an Array field from a Firestone database and then returns a list dynamic.
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
class GetUserLikes {
final FirebaseFirestore _firestore = FirebaseFirestore.instance;
final user = FirebaseAuth.instance.currentUser!;
Future<List> getUsersLikes() async {
// Get the list of user likes from the Firestone Database and then
// return the list so it will only show the users likes on the profile page.
try {
final docRef = _firestore.collection("user_details").doc(user.uid);
DocumentSnapshot doc = await docRef.get(); // Await
final data = doc.data() as Map<String, dynamic>;
return data['user_likes'];
} catch (err) {
print('There was an error');
}
return ['Nothing Returned'];
}
Future<List> getLikes() async {
// Takes the Future<List> and turns it into a List<dynamic>
Future<List> userLikes = getUsersLikes();
List list = await userLikes;
return list; // Returns List<dynamic>
}
}
Then on the receiving Future builder it will have to be awaited.
GetUserLikes userLikesList = GetUserLikes();
List userLikes = await userLikesList.getLikes();