[chore] TSLint cleanup

utils/uiHelpers/removeChildrenFromElement.ts

@@ -1,6 +1,11 @@
 import { isString } from "../helpers/isString";
 import { getElementById } from "./getElementById";
 
+/**
+ * Clears out all children from the provided element.
+ * If a string is passed in, it will treat it as an ID and search for the element to delete all children from.
+ * @param el The element or ID of an element to remove all children from.
+ */
 export function removeChildrenFromElement(el: string | null | Element) {
     if (el === null) {
         return;
@@ -10,7 +15,7 @@ export function removeChildrenFromElement(el: string | null | Element) {
         const elem: HTMLElement | Element = (isString(el) ? getElementById(el as string) : el as Element);
 
         if (elem instanceof Element) {
-            while (elem.firstChild) {
+            while (elem.firstChild !== null) {
                 elem.removeChild(elem.firstChild);
             }
         }