export declare const ms: {
    /**
     * Formats milliseconds to pretty string output
     */
    format(milliseconds: number, long?: boolean): string;
    /**
     * Parse the time expression to milliseconds. If the unit value is a number,
     * then it will be returned as it is. Otherwise the string expression will
     * be converted to a number representing seconds.
     */
    parse(duration: string | number): number;
};