Hot reload @import files

[jamauro]

I'm importing a file into my /client/main.css like this:

@import '../imports/ui/css/ds.css';

ds.css is importing several files like this:

@import '_minireset.css';
@import '_fonts.css';
@import '_base.css';
/* ...etc */

When I make a change to one of the files imported in ds.css, e.g. _base.css, the change isn't hot reloaded. Am I missing something? Is there a way to set things up so that these are watched?