The Magic Module consolidates a number of these useful tools into one place.
Instead of each of each theme re-implementing useful front-end functionality, Magic moves it all into the module space. Currently it provides some really handy features for themers including:
- Enhancements to CSS Aggregation
- Explicitly exclude CSS and JS files
- Rebuild Theme Registry on Page Reload
- Display a Viewport Width indicator
The module will also allow each of your themes to export a set of Magic settings. Visit the "Settings" page of your theme for an example (e.g. /admin/appearance/settings/bartik).
Now your custom themes can quickly and easily take advantage of a whole host of front-end development tools!