错误：无法将类型'（Data ?, URLResponse ?, Error？）-> Void'的值转换为预期的参数类型'（Data ?, URLResponse ?, Error？）-> Void'

Question

我遇到错误“ 错误：无法将类型'（Data ?, URLResponse ?, Error？）-> Void'的值转换为预期的参数类型'（Data ?, URLResponse ?, Error？）->写入URLSessionProtocol扩展名时无效'”

protocol URLSessionProtocol {
    typealias DataTaskResult = (Data?, URLResponse?, Error?) -> ()
    func dataTask(request: URLRequest, completionHandler: @escaping DataTaskResult) -> URLSessionDataTask
}

extension URLSession: URLSessionProtocol {
    func dataTask(request: URLRequest, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask {
        return dataTask(with: request, completionHandler: completionHandler)
    }
}

下面是调用dataTask的类，

final class URLSessionProvider: ProviderProtocol {

    private var session: URLSessionProtocol

    init(session: URLSessionProtocol = URLSession.shared) {
        self.session = session
    }

    func request(service: ServiceProtocol, completion: @escaping (NetworkResponse) -> ()) {
        let request = URLRequest(service: service)

        let task = session.dataTask(request: request, completionHandler: { [weak self] data, response, error in
            let httpResponse = response as? HTTPURLResponse
            self?.handleDataResponse(data: data, response: httpResponse, error: error, completion: completion)
        })
        task.resume()
    }

    private func handleDataResponse(data: Data?, response: HTTPURLResponse?, error: Error?, completion: (NetworkResponse) -> ()) {
        guard error == nil else {
            return completion(.failure(.unknown))
        }
        guard let response = response else {
            return completion(.failure(.noJSONData))
        }

        switch response.statusCode {
        case 200...299:
            guard let data = data else { return completion(.failure(.unknown)) }
            completion(.success(data: data))
        default:
            completion(.failure(.unknown))
        }
    }

}

感谢所有输入来解决问题