I don't usually go for a FP library, lot of people do though. But I understand that for must of the concepts you normally would want to use/implement can be done without a library for that.
I would recommend looking at Ramda.js, if you haven't already.
So do you have a separate fill with all your FP functions ready to be used?
Probably you are not using FP to its fullest.
Yep, I had the chance to use Ramda quite easy to pick up, but sometimes I feel the code become too verbose.