ader.loadEntrypoint({
        serviceWorker: {
          serviceWorkerVersion: serviceWorkerVersion,
        },
        onEntrypointLoaded: async function(engineInitializer) {
          // Initialize the Flutter engine
          const appRunner = await engineInitializer.initializeEngine({
            multiViewEnabled: true,
          });
          // Run the app
          const flutterApp = await appRunner.runApp();
          flutterApp.addView({ hostElement: document.querySelector("body") });
        }
   