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

@@ -1,9 +1,11 @@
-if (!Element.prototype.matches) {
+export const addPolyfills = () => {
+
+  if (!Element.prototype.matches) {
     Element.prototype.matches = Element.prototype.msMatchesSelector ||
       Element.prototype.webkitMatchesSelector;
-}
+  }
 
-if (!Element.prototype.closest) {
+  if (!Element.prototype.closest) {
     Element.prototype.closest = function(s) {
       let el = this;
 
@@ -13,4 +15,6 @@ if (!Element.prototype.closest) {
       } while (el !== null && el.nodeType === 1);
       return null;
     };
+  }
+
 }