common: add formatNumber - use toLocaleString and support current application locale + custom options

js/src/common/utils/formatNumber.ts

@@ -0,0 +1,16 @@
+/**
+ * The `formatNumber` utility localizes a number into a string with the
+ * appropriate punctuation.
+ *
+ * @param number Number to format
+ * @param options Maximum significant digits or formatting options object
+ *
+ * @example
+ * formatNumber(1234);
+ * // 1,234
+ */
+export default function formatNumber(number: number, options: number | Intl.NumberFormatOptions = {}): string {
+    const config = typeof options === 'number' ? { maximumSignificantDigits: options } : options;
+
+    return number.toLocaleString(app.translator.locale, config);
+}