Initial commit

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

Package.swift

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+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "AsyncBackports",
+    platforms: [        
+        .macOS(.v12),
+        .iOS(.v15),
+        .watchOS(.v8),
+        .tvOS(.v15),
+    ],
+    products: [
+        .library(name: "AsyncBackports", targets: ["AsyncBackports"]),
+    ],
+    targets: [
+        .target(name: "AsyncBackports", dependencies: []),
+    ]
+)

README.md

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+# AsyncBackports
+
+A description of this package.

Sources/AsyncBackports/Backport.swift

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+public struct Backport<Original> {
+    let original: Original
+}
+

Sources/AsyncBackports/URLSession+Backport.swift

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+import Foundation
+
+public extension URLSession {
+    var backport: Backport<URLSession> { .init(original: self) }
+}
+
+public extension Backport where Original: URLSession {
+
+    /// Convenience method to load data using an URLRequest, creates and resumes an URLSessionDataTask internally.
+    ///
+    /// - Parameter request: The URLRequest for which to load data.
+    /// - Parameter delegate: Task-specific delegate.
+    /// - Returns: Data and response.
+    @available(macOS, deprecated: 12.0, message: "No need for .backport any more")
+    @available(iOS, deprecated: 15.0, message: "No need for .backport any more")
+    @available(tvOS, deprecated: 15.0, message: "No need for .backport any more")
+    @available(watchOS, deprecated: 8.0, message: "No need for .backport any more")
+    func data(for request: URLRequest, delegate: URLSessionTaskDelegate? = nil) async throws -> (Data, URLResponse) {
+        return try await original.data(for: request, delegate: delegate)
+    }
+
+    /// Convenience method to load data using an URL, creates and resumes an URLSessionDataTask internally.
+    ///
+    /// - Parameter url: The URL for which to load data.
+    /// - Parameter delegate: Task-specific delegate.
+    /// - Returns: Data and response.
+    @available(macOS, deprecated: 12.0, message: "No need for .backport any more")
+    @available(iOS, deprecated: 15.0, message: "No need for .backport any more")
+    @available(tvOS, deprecated: 15.0, message: "No need for .backport any more")
+    @available(watchOS, deprecated: 8.0, message: "No need for .backport any more")
+    func data(from url: URL, delegate: URLSessionTaskDelegate? = nil) async throws -> (Data, URLResponse) {
+        return try await original.data(from: url, delegate: delegate)
+    }
+}