FirebaseFirestore Query Snapshot listener to Result conversion wrapper.

Query+Result.swift

import FirebaseFirestore

@available(swift 5.0)
public extension Query {
    func addSnapshotListener(
        includeMetadataChanges: Bool = false,
        listener: @escaping (Result<QuerySnapshot, Error>) -> ()
    ) -> some ListenerRegistration {
        addSnapshotListener(includeMetadataChanges: includeMetadataChanges) { snapshot, error in
            if let error {
                listener(.failure(error))
            } else {
                listener(.success(snapshot!))
            }
        }
    }
}