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I've updated the directive so that it shouldn't need jQuery any more (there was only something like 2-3 lines that used jQuery).
I'm unsure why or if it was just my test page but the calls to scope.$apply were causing digest in progress errors so I've changed them to $evalAsync as a stop gap.
The version of nouislider I was using (9.0.0) didn't seem to have a .val() method so I've replaced them with .get() and .set() as appropriate
Only other thing worth noting is that I'm not very familiar with CoffeeScript so there might be cleaner ways of implementing some of the changes I've made.