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/** * Use this API for locale-based formatting. * * @param {Date}  date - Date object, which should be used. * @param {string} exp - String, which you want to format, for example: `{MMMM}` or `Day of week: {EEE}`. * @param {string | string[]} [locale="en-US"] - Locale(s), which will be used for formatting. * @return {string} String with formatted date. * * @example * localeFormat(new Date(2014, 1, 11), '{MMM}') //=> 'Jan' */export default (date: Date, exp: string, locale: string | string[] = 'en-US'): string => exp.replace(/\\?{.*?}/g, key => {	if (key.startsWith('\\')) {		return key.slice(1);	}
	switch (key) {		case '{MMMMM}':			return new Intl.DateTimeFormat(locale, {month: 'narrow'}).format(date);		case '{MMMM}':			return new Intl.DateTimeFormat(locale, {month: 'long'}).format(date);		case '{MMM}':			return new Intl.DateTimeFormat(locale, {month: 'short'}).format(date);		case '{EEEEE}':			return new Intl.DateTimeFormat(locale, {weekday: 'narrow'}).format(date);		case '{EEEE}':			return new Intl.DateTimeFormat(locale, {weekday: 'long'}).format(date);		case '{EEE}':		case '{EE}':		case '{E}':			return new Intl.DateTimeFormat(locale, {weekday: 'short'}).format(date);		default:			return '';	}});