https://my.rheumatology.org/lightning/lightning.out.js?v=2

1// make sure we don't redefine the api if already present
2if (!window.$Lightning) {
3	$Lightning = (function() {
4		// delegate status
5		var delegateLoaded = false;
6		
7		// queue to store un-delegated calls
8		var callQueue = [];
9		
10		// util methods
11		function getDelegateScriptUrl() {
12			// load the delegate script based on stored version (got from aura nonce) or get latest version
13			var url = "/lightning/lightning.out.delegate.js?v=" + getDelegateScriptVersion();
14			
15			// Extract the base path from our own <script> include to adjust for LC4VF/Communities/Sites
16			var scripts = document.getElementsByTagName("script");
17			for (var m = 0; m < scripts.length; m++) {
18				var script = scripts[m].src;
19				var i = script.indexOf("/lightning/lightning.out.js");
20				if (i >= 0) {
21					var basePath = script.substring(0, i);
22					url = basePath + url;
23					break;
24				}
25			}
26			
27			return url;
28		}
29		
30		function getDelegateScriptVersion(){
31			try {
32				if(localStorage.lightningOutDelegateVersion){
33					return localStorage.lightningOutDelegateVersion;
34				}
35			} catch (e) {}
36			return (new Date()).getTime();
37		}
38		
39		function loadDelegateScript() {
40			var script = document.createElement('script');
41			script.type = "text/javascript";
42			script.src = getDelegateScriptUrl();
43			script.onload = function() {
44				delegateLoaded = true;
45				while(callQueue.length) {
46					$Lightning._delegate.use.apply(this, callQueue.shift());
47				}
48			}
49			document.head.appendChild(script);
50		}
51		
52		// load delegate
53		loadDelegateScript();
54		
55		return {
56			use: function() {
57				var args = Array.prototype.slice.call(arguments);
58				if (delegateLoaded) {
59					return $Lightning._delegate.use.apply(this, args);
60				} else {
61					// queue the request
62					return callQueue.push(args);
63				}
64			},
65			createComponent: function() {
66				return $Lightning._delegate.createComponent.apply(this, Array.prototype.slice.call(arguments));
67			},
68			getApplication: function() {
69				return $Lightning._delegate.getApplication.apply(this, Array.prototype.slice.call(arguments));
70			},
71			lightningLoaded: function() {
72				return $Lightning._delegate.lightningLoaded.apply(this, Array.prototype.slice.call(arguments));
73			},
74			ready: function() {
75				return $Lightning._delegate.ready.apply(this, Array.prototype.slice.call(arguments));
76			}
77		}
78	})();
79}