It's simply a VSCode extension made for humour purposes by showing some random programming-related jokes to the user.
VSJoke works as a webview, and every action/event will be detected by the main.js file and send requests to the Joke API depends on the filer.
It's pretty easy, like any other VSCode extension.
Just go to the extensions section in your IDE, search for vsjoke, click on the first one, hit install and here you go 🚀