Yeah I was working on a diagram software [1] that looked similar to VS Code and can be extended easily. Applied to YCombinator but they didn't think it's worth it, so .
[1] This was the Angular+Electron version (ported to React afterwards) with the Visio logo: https://imgur.com/a/UDkitDm
[1] This was the Angular+Electron version (ported to React afterwards) with the Visio logo: https://imgur.com/a/UDkitDm