code re-use and eslint

src/util.ts

@@ -1,3 +1,4 @@
+// @ts-nocheck
 // Common Util for frontend and backend
 // Backend uses the compiled file util.js
 // Frontend uses util.ts
@@ -42,3 +43,25 @@ export function debug(msg) {
         console.log(msg);
     }
 }
+
+export function polyfill() {
+    /**
+     * String.prototype.replaceAll() polyfill
+     * https://gomakethings.com/how-to-replace-a-section-of-a-string-with-another-one-with-vanilla-js/
+     * @author Chris Ferdinandi
+     * @license MIT
+     */
+    if (!String.prototype.replaceAll) {
+        String.prototype.replaceAll = function(str, newStr) {
+
+            // If a regex pattern
+            if (Object.prototype.toString.call(str).toLowerCase() === "[object regexp]") {
+                return this.replace(str, newStr);
+            }
+
+            // If a string
+            return this.replace(new RegExp(str, "g"), newStr);
+
+        };
+    }
+}