Uncaught ReferenceError: rbush is not defined

[jvolker]

I installed the latest version via npm and required via Browserify:

require('leaflet.layergroup.collision')

I got the following error:

Uncaught ReferenceError: rbush is not defined

I could workaround by changing the require part to the following:

global.rbush = require('rbush')
require('leaflet.layergroup.collision')

[sport4minus]

in the context of an ionic/angular app we had the same error.
it could be solved through calling

import * as rbush from "rbush"; in the first line of Leaflet.LayerGroup.Collision.js

instead of

let rbush = require("rbush");

on @carlletons fork -> https://github.com/carlleton/Leaflet.LayerGroup.Collision