SideCar is a small piece of middleware plus a "web server" extension for ASP.NET Core that simplifies executing C# code in browsers via WASM.
The middleware handles fetching Mono WASM SDKs, compiling packages, and serving files that virtually map from a typical browser request URL to the relevant build.
With the middleware installed, making a C# assembly available for execution in WASM is as simple as referencing it in a query string.
<head>
<script defer type="text/javascript" src="mono-config.js?p=MyAssemblyName"></script>
<script defer type="text/javascript" src="runtime.js?p=MyAssemblyName"></script>
<script defer type="text/javascript" src="mono.js"></script>
</head>