Firebase document decoding to Swift Object

Firebase+Tools.swift

func resolveFirebaseObject<T: Codable>(_ snapshot: DocumentSnapshot) -> T? {
        guard snapshot.exists else {return nil}
        if let data = try?  JSONSerialization.data(withJSONObject: snapshot.data(), options: []) {
            do {
                return try self.decoder.decode(T.self, from: data)
            } catch {
                print("Decoding error: \(error)")
            }
        }
        return nil
    }