Ah, you should definitely join in on our Slack. Another guy has done some similar work in a plugin: https://github.com/extr0py/vscode-relative-line-numbers
yeah, that's the extension that inspired me ;)
The reason that plugin lags is because it was using `setInterval` initially but I changed it to selectionChange hook and now it works smoothly. Now the only problem with it is it hides breakpoints but definitely we will improve this experience later on. / I'm a Code team member*/
I find relative number very useful to jump lines. Please consider showing current line number for current line. And go ahead with the pull request, many of us need this feature :)
BTW I do not use TypeScript (or JS), but it was quite easy to write, still I was quite surprissed how messy VS Code codebase is.