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

Formats JavaScript dates to relative time strings.

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.RelativeTimeFormat.supportedLocalesOf(locales).length === locales.length;
}
function hasResolvedOptionsNumberingSystem(locale) {
	try {
		return "numberingSystem" in new Intl.RelativeTimeFormat(locale || "en", { numeric: "auto" }).resolvedOptions();
	} catch {
		return false;
	}
}
export function shouldPolyfill(locale = "en") {
	if (!("RelativeTimeFormat" in Intl) || !supportedLocalesOf(locale) || !hasResolvedOptionsNumberingSystem(locale)) {
		return match([locale], supportedLocales, "en");
	}
}