This will most definitely result in a merge conflict if #1009 gets merged, perhaps branch off of that and see where you land?

I'm also not sure whether it was decided to have jsx be a separate syntax or to include it in the Javascript syntax. See the separate issue for details.

#1009 is merged, and it does look as though the changes conflict. If it helps, I intend to implement decorators as part of #1269 within the next few weeks. (I'm waiting on #1292 to lessen the risk of conflicts, but that's a much smaller change than #1009 was.)

Per #860, the current plan is to add a separate JSX syntax. There are some unanswered questions about the details of maintaining two syntaxes like that. In any case, it would probably be best to finish up #1292 first.

Is this obsolete, now that #1483 is merged?

It is.

Now that #1483 is merged, this should be closed.

Decorators are now part of JavaScript, and if we include support for JSX, it will be a separate syntax.