calendar.js file

We received a Wordfence warning about a modified file in our Time.ly plugin:
wp-content/plugins/all-in-one-event-calendar/public/js_cache/calendar.js

The calendar.js file in my install (first few lines below) is full of script (although it looks legit). The file in the archive that I downloaded is empty.

What’s up? Should this file be empty, or does it somehow get populated after installation?

Below are the first few lines of the calendar.js file in my install:

/** vim: et:ts=4:sw=4:sts=4
 * @license RequireJS 2.1.5 Copyright (c) 2010-2012, The Dojo Foundation All Rights Reserved.
 * Available via the MIT or new BSD license.
 * see: https://github.com/jrburke/requirejs for details
 */

var timely;(function(){if(!timely||!timely.requirejs){timely?require=timely:timely={