extension Notification.Name {
    static let urlSessionTaskDidStart = Notification.Name("didStartURLSessionTask")
    static let urlSessionTaskDidComplete = Notification.Name("didStartURLSessionTask")
}

extension Notification {
    static func makeURLSessionTaskNotification(_ urlSessionTask: URLSessionTask?,
                                               urlSession: URLSession?,
                                               forName name: Notification.Name) -> Notification {
        guard let urlSessionTask = urlSessionTask else { fatalError("URLSessionTask was empty.") }
        return Notification(name: name, object: urlSession, userInfo: [URLSessionTask.urlSessionTaskKey: urlSessionTask])
    }
}

extension URLSessionTask {
    static let urlSessionTaskKey = "URLSessionTask.urlSessionTaskKey"
}