GitHub has a new feature - VS Code in the cloud
Open up a random ObjectScript project (I think you need to be logged in first for this to work).
Then press "." (press full stop).
This will open the git repo inside an online instance of VS code.
Perhaps not that exciting for some, but I was impressed. Mainly because it's a good demo of editing ObjectScript in the cloud. As much as I like VS code locally, I still can't use it on many sites, and maybe not popular, but I still think IRIS + its own web IDE would be a killer combination.
Looks like extensions in the marketplace are limited to core / common extensions at the moment, so no syntax highlighting yet.