Why can't my code access this variable?

I'm trying to build an extension for another program using an SDK. The code is written in JavaScript.

I am loading in an external library (Highcharts) using the SDK's built-in requireJS functionality.

However when I try to access Highcharts, via the Highcharts variable, the browser tells me it is undefined.

I tried console.log(this) to my code, after it should have been loaded, and you can see the output below, in the image. Highcharts seems to have been loaded. When I try console.log(EPCMPROXY) I get that object, but when I try console.log(Highcharts), I get undefined. If I open the console of the browser window, and manually type in Highcharts, it returns the object. Am I doing something wrong, or referencing Highcharts incorrectly? How is it possible that I can access the one object (EPCMPROXY) but not the other (Highcharts) when they are in the same scope?

Code:

console.log(this);
console.log(Highcharts);
console.log(EPCMPROXY);  //some var generated by the page, used as example here

Output of console.log(this):

j {owner: f, init: function, componentDeleted: function, beforeUpdate: function, afterUpdate: function…}
    $:function ()
        arguments : null
        caller : null
        length : 0
        name : ""
        prototype : Object
        __proto__ : function ()
        [[FunctionLocation]] : combined_static_includes_1.jsversion=20170105152024:25
        [[Scopes]]:Scopes[2]
            0 : Closure (a)
            1 : Global
                $ : function (e,i)
                AsyncHandleJavascriptError : function AsyncHandleJavascriptError(a)
                EPCMPROXY : Object
                ES6Promise : Object
                Highcharts : Object

Output of console.log(Highcharts):

undefined

Output of console.log(EPCMPROXY):

Object
  ...