Hot reload @import files

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

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

`ds.css` is importing several files like this:

```css
@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?

Start with the import chain from /client/main.css to imports/ui/css/ds.css and reproduce the issue by changing _base.css or another imported file. Done means changes in files imported by ds.css are detected and hot reloaded during development.

Written by the indexing model from the issue text.