export declare type TDate = Date | string | number;
export declare type LocaleFunc = (diff: number, idx: number, totalSec?: number) => [string, string];
export declare type LocaleMap = Record<string, LocaleFunc>;
/**
 * render / format options
 */
export declare type Opts = {
    /** the relative date */
    readonly relativeDate?: TDate;
    /** the realtime */
    readonly minInterval?: number;
};
export declare function toDate(input?: Date | string | number): Date;
/**
 * format the diff second to *** time ago, with setting locale
 * @param diff
 * @param localeFunc
 * @returns
 */
export declare function formatDiff(diff: number, localeFunc: LocaleFunc): string;
/**
 * calculate the diff second between date to be formatted an now date.
 * @param date
 * @param relativeDate
 */
export declare function diffSec(date: TDate, relativeDate: TDate): number;
/**
 * nextInterval: calculate the next interval time.
 * - diff: the diff sec between now and date to be formatted.
 *
 * What's the meaning?
 * diff = 61 then return 59
 * diff = 3601 (an hour + 1 second), then return 3599
 * make the interval with high performance.
 **/
export declare function nextInterval(diff: number): number;
export declare const format: (date: string | number | Date, locale?: string, opts?: Opts) => string;
/**
 * register a locale
 * @param locale
 * @param func
 */
export declare const register: (locale: string, func: LocaleFunc) => void;
/**
 * get a locale, default is en_US
 * @param locale
 */
export declare const getLocale: (locale: string) => LocaleFunc;