URLSession+BackportAsync.swift

public struct Backport<Portee> {
    let portee: Portee
}

public extension URLSession {
    var backport: Backport<URLSession> {
        Backport(portee: self)
    }
}

public extension Backport where Portee == URLSession {
    @available(iOS, deprecated: 15.0, message: "This backport is no longer needed since iOS 15. Use data(from:) directly.")
    func data(from url: URL) async throws -> (Data, URLResponse) {
        try await withCheckedThrowingContinuation { continuation in
            portee.dataTask(with: url) { data, response, error in
                if let data = data, let response = response {
                    continuation.resume(returning: (data, response))
                } else {
                    continuation.resume(throwing: error ?? URLError(.badServerResponse))
                }
            }
            .resume()
        }
    }
}