It's going to use most of the frontend UI code but all of the NodeJS-specific stuff in the desktop version is a no-go and has to be shimmed or polyfilled to run

It's going to use most of the frontend UI code but all of the NodeJS-specific stuff in the desktop version is a no-go and has to be shimmed or polyfilled to run in the browser. The biggest thing you lose here is system-level access like the ability to run processes--tests, terminals, debugging, etc. And as the blog post mentions unfortunately these things aren't supported yet in vscode.dev.