WasmWrangler is a NuGet package that enables your C# application to be run in a browser. Think of it as the Vanilla JS for C#.

If the version of Mono Wasm SDK isn't available before you start building you'll likely receive an error about "Unable to resolve WebAssembly.Bindings.dll".

Rebuilding might solve the problem but there is a build script provided that will ensure the Mono Wasm SDK is present:

dotnet msbuild build/WasmEnsureSDKAvailable.proj

This builds the WasmWrangler assembly and calls the WasmEnsureSDKAvailable target which will download the SDK if it's not available on your machine.