src/polyfills.ts

@@ -64,3 +64,5 @@ import 'zone.js/dist/zone';  // Included with Angular CLI.
 /***************************************************************************************************
  * APPLICATION IMPORTS
  */
+
+import './polyfills/pad-start.js';

src/polyfills/pad-start.js

+// https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
+if (!String.prototype.padStart) {
+  String.prototype.padStart = function padStart(targetLength, padString) {
+    targetLength = targetLength >> 0; //truncate if number, or convert non-number to 0;
+    padString = String(typeof padString !== 'undefined' ? padString : ' ');
+    if (this.length >= targetLength) {
+      return String(this);
+    } else {
+      targetLength = targetLength - this.length;
+      if (targetLength > padString.length) {
+        padString += padString.repeat(targetLength / padString.length); //append to original to ensure we are longer than needed
+      }
+      return padString.slice(0, targetLength) + String(this);
+    }
+  };
+}