Exported MS Edge polyfill

src/TextAnnotator.jsx

@@ -4,8 +4,9 @@ import Highlighter from './highlighter/Highlighter';
 import SelectionHandler from './selection/SelectionHandler';
 import RelationsLayer from './relations/RelationsLayer';
 import RelationEditor from './relations/editor/RelationEditor';
+import { addPolyfills } from './utils/MSEdgePolyfills';
 
-import './utils/MSEdgePolyfills';
+addPolyfills(); // For Microsoft Edge
 
 /**
  * Pulls the strings between the annotation highlight layer

src/utils/MSEdgePolyfills.js

@@ -1,3 +1,5 @@
+export const addPolyfills = () => {
+
   if (!Element.prototype.matches) {
     Element.prototype.matches = Element.prototype.msMatchesSelector ||
       Element.prototype.webkitMatchesSelector;
@@ -14,3 +16,5 @@ if (!Element.prototype.closest) {
       return null;
     };
   }
+
+}