@formatjs/intl-listformat/should-polyfill.js

Formats JS list in a i18n-safe way

import { match } from "@formatjs/intl-localematcher";
import { supportedLocales } from "./supported-locales.generated.js";
function supportedLocalesOf(locale) {
	if (!locale) {
		return true;
	}
	const locales = Array.isArray(locale) ? locale : [locale];
	return Intl.ListFormat.supportedLocalesOf(locales).length === locales.length;
}
export function shouldPolyfill(locale = "en") {
	if (!("ListFormat" in Intl) || !supportedLocalesOf(locale)) {
		return locale ? match([locale], supportedLocales, "en") : undefined;
	}
}