CSS and JavaScript Cache missing in version 9

The CSS and JavaScript Cache function used to combine files in version 8 is not available in version 9.

How are we now supposed to deal with multiple js and css files loaded by third party AddOns?

Previously it was easy to register theme css/js Assets, combine them with those from third party AddOns and core components and end up with single combined files for both js and css.

This doesn’t seem to be possible any more, or am I missing something?

Discussion now on GitHub at