ember handlebars: find which addon is defining a helper (Not present in app/helpers)

Having a hard time finding out where a helper not in app/helpers is defined. The helper was very generically named, I searched my package.json for the helper name but there was nothing. I was stuck hunting around with google to try and figure out what addon defined it.

Given some helper () how would one go about finding where it's defined?

(I happen to be on Ember 2.13)

(Note: the helper was contains defined in ember-composable-helpers, so it would have been a LITTLE helpful to search package.json for "helper" but that is a pretty tedious in-direct way of searching, which have may not even yielded the answer)