one/dist/esm/platform/localization/index.mjs

One is a React framework for web, iOS, and Android apps.

import { useEffect, useState } from "react";
import { FALLBACK_CALENDAR, FALLBACK_LOCALE } from "./map.mjs";

function localeFor(tag) {
	try {
		const parsed = new Intl.Locale(tag);
		const numbers = new Intl.NumberFormat(tag).formatToParts(1234567.89);
		const part = (type) => numbers.find((entry) => entry.type === type)?.value ?? null;
		const direction = parsed.textInfo?.direction;
		return {
			languageTag: parsed.baseName,
			languageCode: parsed.language ?? null,
			languageScriptCode: parsed.script ?? null,
			regionCode: parsed.region ?? null,
			languageRegionCode: parsed.region ?? null,
			currencyCode: null,
			currencySymbol: null,
			languageCurrencyCode: null,
			languageCurrencySymbol: null,
			decimalSeparator: part("decimal"),
			digitGroupingSeparator: part("group"),
			textDirection: direction === "rtl" ? "rtl" : "ltr",
			measurementSystem: null,
			temperatureUnit: null
		};
	} catch {
		return {
			...FALLBACK_LOCALE,
			languageTag: tag
		};
	}
}
function getLocales() {
	if (typeof navigator === "undefined" || !navigator.languages?.length) {
		return [FALLBACK_LOCALE];
	}
	const locales = [...navigator.languages].map(localeFor);
	return locales.length > 0 ? locales : [FALLBACK_LOCALE];
}
function getCalendars() {
	if (typeof Intl === "undefined") return [FALLBACK_CALENDAR];
	try {
		const options = new Intl.DateTimeFormat().resolvedOptions();
		const parsed = new Intl.Locale(options.locale);
		const firstDay = parsed.weekInfo?.firstDay;
		return [{
			calendar: options.calendar ?? null,
			timeZone: options.timeZone ?? null,
			uses24hourClock: parsed.hourCycle === void 0 ? null : parsed.hourCycle === "h23" || parsed.hourCycle === "h24",
			firstWeekday: firstDay === void 0 ? null : firstDay % 7 + 1
		}];
	} catch {
		return [FALLBACK_CALENDAR];
	}
}
function subscribe(refresh) {
	if (typeof window === "undefined") return void 0;
	window.addEventListener("languagechange", refresh);
	return () => window.removeEventListener("languagechange", refresh);
}
function useLocales() {
	const [locales, setLocales] = useState(() => getLocales());
	useEffect(() => subscribe(() => setLocales(getLocales())), []);
	return locales;
}
function useCalendars() {
	const [calendars, setCalendars] = useState(() => getCalendars());
	useEffect(() => subscribe(() => setCalendars(getCalendars())), []);
	return calendars;
}
const Localization = Object.freeze({
	getLocales,
	getCalendars
});

export { Localization, useCalendars, useLocales };
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