Add toPercent utility for compatibility

src/utils/number.ts

@@ -0,0 +1,23 @@
+function toLocaleStringSupportsOptions() {
+    return !!(typeof Intl === 'object' && Intl && typeof Intl.NumberFormat === 'function');
+}
+
+/**
+ * Gets the value of a number formatted as a perentage.
+ * @param {number} value The value as a number.
+ * @returns {string} The value formatted as a percentage.
+ */
+export function toPercent(value: number | null | undefined, locale: string): string {
+    if (value == null) {
+        return '';
+    }
+
+    if (toLocaleStringSupportsOptions()) {
+        return value.toLocaleString(locale, {
+            style: 'percent',
+            maximumFractionDigits: 0
+        });
+    }
+
+    return `${Math.round(value * 100)}%`;
+}