AppManifest for WebAssembly head project
The [AppName] project in your solution typically includes a manifest file containing settings for the WebAssembly application. This file is typically generated for you under Platforms/WebAssembly/WasmScripts/AppManifest.js.
AppManifest properties
This app manifest file allows you to customize certain aspects of the WebAssembly application, including its loading screen. This loading UI is often referred to as the "splash screen" in documentation. For more information, see How to manually add a splash screen.
Add a missing manifest file
If you created an application without using the default Uno templates, you may need to add the manifest file manually.
To do this, create a folder named Platforms/WebAssembly/WasmScripts in your [AppName] project, with a file containing the JavaScript code below
(e.g. AppManifest.js).
If the project is not using the Uno.Sdk, Set the manifest file's build action to Embedded resource, and edit the contents of this file to resemble the following:
var UnoAppManifest = {
splashScreenImage: "Assets/SplashScreen.scale-200.png",
splashScreenColor: "transparent",
displayName: "SplashScreenSample"
}