Because the point of this column is the code in the client, I'll just build a dummy Web API service. My first method, which will be automatically called whenever an HTTP Get method without parameters ...

You don't need to write tons of JavaScript code to create a JavaScript-friendly MVVM app. Let DotVVM can take over. Here's a basic tutorial for developing with it ...

At its core, VS Code is built on an open source project called Code OSS, published under the permissive MIT license.