How to register helper in handlebars?

Question

JSON

Good evening, I ran into a problem, I can’t register this helper
https://github.com/shannonmoeller/handlebars-group-by
show me how to register it, there is not much information about it!
I understand how to connect when you create it yourself, but then I just have to register it, but how ??
constantly shows an error that message: "Missing helper: "group""
Where should I enter this?
gulpfile.js?
var handlebars = require('handlebars'),
groupBy = require('handlebars-group-by');
handlebars.registerHelper(groupBy(handlebars));