[refactor] Moved 'clearEventListeners' to its own TS file

utils/uiHelpers/clearEventListeners.ts

@@ -0,0 +1,23 @@
+import { getElementById } from "./getElementById";
+
+/**
+ * Given an element by its ID, removes all event listeners from that element by cloning and
+ * replacing. Then returns the new cloned element.
+ * @param elemId The HTML ID to retrieve the element by.
+ */
+export function clearEventListeners(elemId: string) {
+    try {
+        const elem: HTMLElement = getElementById(elemId);
+        const newElem: HTMLElement = elem.cloneNode(true) as HTMLElement;
+        if (elem.parentNode !== null) {
+            elem.parentNode.replaceChild(newElem, elem);
+        }
+
+        return newElem;
+    } catch (e) {
+        // tslint:disable-next-line:no-console
+        console.error(e);
+
+        return null;
+    }
+}