UMD

Universal Module Definition

(function (root, factory) {
    if (typeof define === "function" && define.amd) 
        define(["jquery", "underscore"], factory)
     else if (typeof exports === "object") 
        module.exports = factory(require("jquery"), require("underscore"))
    else root.Requester = factory(root.$, root._)
}(this, function ($, _) {
    var Requester = {
    return Requester
}))

• Works on front and back end (hence the name universal).

• so UMD is usually used as a fallback module when using bundler like Rollup/ Webpack