How to hookup Sparkle in SwiftUI

ExampleApp.swift

@main
struct PastApp: App { // https://zeezide.de/en/products/past/

  var body: some Scene {

    DocumentGroup(viewing: PastDocument.self) { file in
      ContentView(document: file.$document)
    }
    .commands {
      TextFormattingCommands()
      AboutCommands()
      SparkleCommands() // Just drop it in here
    }
  }
}

SparkleCommands.swift

//
//  SparkleCommands.swift
//  Past for iChat
//
//  Created by Helge Heß on 08.04.21.
//

import SwiftUI

#if SPARKLE && canImport(Sparkle)
  import Sparkle

  /**
   * Update menu, if Sparkle is used.
   */
  struct SparkleCommands: Commands {
    
    init() {
      DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1)) {
        SparkleCommands.setupUpdater()
      }
    }
    
    var body: some Commands {
      CommandGroup(after: .appInfo) {
        Button("Check for Updates …") {
          SparkleCommands.updater?.checkForUpdates()
        }
      }
    }

    fileprivate static var updater : SPUUpdater?
    
    private final class SparkleDelegate:
      NSObject, SPUUpdaterDelegate, SPUStandardUserDriverDelegate {}
    private static let delegate = SparkleDelegate()

    private static func setupUpdater() {
      guard SparkleCommands.updater == nil else { return }
      let updateDriver = SPUStandardUserDriver(hostBundle: .main,
                                               delegate: delegate)
      let updater = SPUUpdater(hostBundle: .main, applicationBundle: .main,
                               userDriver: updateDriver, delegate: delegate)
      updater.automaticallyChecksForUpdates = true
      updater.updateCheckInterval = 24 * 60 * 60 // every day
      SparkleCommands.updater = updater
      
      do {
        try updater.start()
        updater.checkForUpdatesInBackground()
      }
      catch {
        print("ERROR: failed to start Sparkle updater:", error)
      }
    }
  }

#else // No Sparkle

  /**
   * Sparkle is inactive, this will yield no commands.
   */
  struct SparkleCommands: Commands {
    let body = EmptyCommands()
  }
#endif