         // Gets called when the download progress is updated.
     }
 }
+#endif

    _ = request
}

#if os(iOS)
import UIKit

private func checkPerformance02() {
    final class ImageView: UIView {
        private var task: ImageTask?

        prefetcher.startPrefetching(with: urls)
    }
}

// MARK: - ImagePipeline (Extension)

