Chrome has added a kind of inline variable preview into their source view which I find very valuable. It appears to show for any variables on previous lines of the same function, plus arguments in wrapping scopes within view of the source editor. It does not appear when looking at sourcemapped (non-native JS) files.

I've thought about this, and it is a neat feature. It seems a bit cluttered, so I don't know if there's any different way to achieve something similar, but we should try it out at some point.

This is a feature request. I would normally flag this as P3, so someone can pick it up if they have any spare cycles. However, multiple people have told me that they'd like to see this feature. I'm marking this as P2 so that it hopefully stays on our radar.

I believe we should wait until later this year to do this. The debugger is very much in flux and this will probably require a good bit of changes on both the frontend and the server. The server changes is what will probably be the hardest. For the frontend, I'd like to see if we can wait until I get the new frontend working. If that takes too long, we'll have to figure out a way to share code between old and new versions of the frontend so we can still land features. Anyway, let's wait at least a couple months to see how things shape up.