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

Intl.Enumerator polyfill

import { createMemoizedNumberFormat } from "@formatjs/ecma402-abstract";
import { currencies } from "./currencies.generated.js";
function isSupportedCurrency(currency, locale = "en") {
	try {
		const numberFormat = createMemoizedNumberFormat(locale, {
			style: "currency",
			currencyDisplay: "name",
			currency
		});
		const format = numberFormat.format(123);
		if (format.substring(0, 3) !== currency && format.substring(format.length - 3) !== currency) {
			return true;
		}
	} catch {}
	return false;
}
export function getSupportedCurrencies(locale) {
	const ATOZ = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	const supportedCurrencies = [];
	for (const currency of currencies) {
		if (currency.length === 3) {
			if (isSupportedCurrency(currency, locale)) {
				supportedCurrencies.push(currency);
			}
		} else if (currency.length === 5 && currency[3] === "~") {
			const start = ATOZ.indexOf(currency[2]);
			const end = ATOZ.indexOf(currency[4]);
			for (let i = start; i <= end; i++) {
				const currentCurrency = currency.substring(0, 2) + ATOZ[i];
				if (isSupportedCurrency(currentCurrency, locale)) {
					supportedCurrencies.push(currentCurrency);
				}
			}
		}
	}
	return supportedCurrencies;
}