@formatjs/intl-enumerator/src/get-supported-timezones.js

Intl.Enumerator polyfill

import { createMemoizedDateTimeFormat } from "@formatjs/ecma402-abstract";
import { timezones } from "./timezones.generated.js";
function isSupported(timeZone, locale = "en") {
	try {
		const formatter = createMemoizedDateTimeFormat(locale, { timeZone });
		return formatter.resolvedOptions().timeZone === timeZone;
	} catch {}
	return false;
}
export function getSupportedTimeZones(locale) {
	return timezones.filter((timezone) => isSupported(timezone, locale));
}