Made locale an optional parameter, default to user locale

js/dist-typings/common/utils/formatNumber.d.ts

@@ -1,9 +1,9 @@
 /**
  * The `formatNumber` utility localizes a number into a string with the
- * appropriate punctuation based on the provided locale.
+ * appropriate punctuation based on the provided locale otherwise will default to the users locale.
  *
  * @example
  * formatNumber(1234, 'en-US');
  * // 1,234
  */
-export default function formatNumber(number: number, locale: string): string;
+export default function formatNumber(number: number, locale?: string): string;

js/src/common/utils/formatNumber.ts

@@ -1,12 +1,16 @@
 /**
  * The `formatNumber` utility localizes a number into a string with the
- * appropriate punctuation based on the provided locale.
+ * appropriate punctuation based on the provided locale otherwise will default to the users locale.
  *
  * @example
  * formatNumber(1234, 'en-US');
  * // 1,234
  */
-export default function formatNumber(number: number, locale: string = 'en-US'): string {
+export default function formatNumber(number: number, locale?: string): string {
+  if (typeof locale === 'undefined') {
+    const locale: string = app.data.locale;
+  }
+
   return new Intl
     .NumberFormat(locale)
     .format(number);