import { Locale, DateFormatOptions } from './transloco-locale.types';
export declare const ISO8601_DATE_REGEX: RegExp;
/**
 * check if a given value is in BCP 47 language tag.
 *
 * isLocaleFormat('en') // false,
 * isLocaleFormat('En-us') // false
 * isLocaleFormat('en-US') // true
 */
export declare function isLocaleFormat(val: any): val is Locale;
export declare function localizeNumber(value: number | string, locale: Locale, options: Intl.NumberFormatOptions): string;
export declare function localizeDate(date: Date, locale: Locale, options: DateFormatOptions): string;
export declare function isDate(value: any): boolean;
export declare function toDate(value: any): Date;
export declare function isoStringToDate(match: RegExpMatchArray): Date;