At this moment there is no support for LESS, and I don't have much free time now. Maybe I'll do it later.
For now you can find another extension that works with LESS, like Web Essentials or LessExtension. Or you can ask the developers of Webscape to make outlining. The made fully-featured editors, why there's no outlining?
This is a great extension I should first say. Was just curious that since Web Essentials extensions has also come out with what looks like similar features (plus other stuff) can you comment on whether you think there is a bit of overlap between the two (maybe you two could somehow collaborate together to use the best of both?)
Hey! You've done a great work indeed!
One issue to improve:
I checked the Collapse to definitions option.
When the js is wrapped in IIFE, inner methods are not collapsed. F.x. one() is not collapsed, but the top level anonymous fx is.
I don't have any other extensions installed. What's happening is that a few seconds after I put a line break after the start of //#region the expand/collapse node shows up. I thought that TFS might somehow be having an impact on this so I started a new website not under source control and found that the same thing is happening.