From 4f5bab823726a4bca212ac42a8e4fdebf3d3aa2a Mon Sep 17 00:00:00 2001
From: Rainer Simon <rainer.simon@ait.ac.at>
Date: Fri, 8 May 2020 20:57:22 +0200
Subject: [PATCH] Exported MS Edge polyfill

---
 src/TextAnnotator.jsx        |  3 ++-
 src/utils/MSEdgePolyfills.js | 30 +++++++++++++++++-------------
 2 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/src/TextAnnotator.jsx b/src/TextAnnotator.jsx
index ae7f32b..8a5550d 100644
--- a/src/TextAnnotator.jsx
+++ b/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
diff --git a/src/utils/MSEdgePolyfills.js b/src/utils/MSEdgePolyfills.js
index d349b88..4d7d508 100644
--- a/src/utils/MSEdgePolyfills.js
+++ b/src/utils/MSEdgePolyfills.js
@@ -1,16 +1,20 @@
-if (!Element.prototype.matches) {
-  Element.prototype.matches = Element.prototype.msMatchesSelector ||
-    Element.prototype.webkitMatchesSelector;
-}
+export const addPolyfills = () => {
 
-if (!Element.prototype.closest) {
-  Element.prototype.closest = function(s) {
-    let el = this;
+  if (!Element.prototype.matches) {
+    Element.prototype.matches = Element.prototype.msMatchesSelector ||
+      Element.prototype.webkitMatchesSelector;
+  }
+
+  if (!Element.prototype.closest) {
+    Element.prototype.closest = function(s) {
+      let el = this;
+
+      do {
+        if (Element.prototype.matches.call(el, s)) return el;
+        el = el.parentElement || el.parentNode;
+      } while (el !== null && el.nodeType === 1);
+      return null;
+    };
+  }
 
-    do {
-      if (Element.prototype.matches.call(el, s)) return el;
-      el = el.parentElement || el.parentNode;
-    } while (el !== null && el.nodeType === 1);
-    return null;
-  };
 }