/**
 * Calculates the time duration between the current time and a given time offset.
 *
 * @param {Date} timeData - The target time as a Date object.
 * @param {string} [durationType='asSeconds'] - The type of duration to return. Can be 'asMilliseconds', 'asSeconds', 'asMinutes', 'asHours', 'asDays'.
 * @param {Date|null} [now=null] - The current time as a Date object. Defaults to the current date and time if not provided.
 * @returns {number|null} The calculated duration in the specified unit, or `null` if `timeData` is not provided.
 */
export function getTimeDuration(timeData?: Date, durationType?: string, now?: Date | null): number | null;
/**
 * Formats a custom timer string based on total seconds and a detail level.
 * Includes proper reallocation of lower units into higher ones, ensuring consistent hierarchy.
 *
 * @param {number} totalSeconds - The total amount of seconds to convert.
 * @param {'seconds'|'minutes'|'hours'|'days'|'months'|'years'} [level] - The highest level to calculate and display.
 * @param {string} [format='{time}'] - Output template with placeholders like {years}, {months}, {days}, {hours}, {minutes}, {seconds}, {time}, {total}.
 * @returns {string} The formatted timer string.
 */
export function formatCustomTimer(totalSeconds: number, level?: "seconds" | "minutes" | "hours" | "days" | "months" | "years", format?: string): string;
/**
 * Formats a duration (in seconds) into a timer string showing only hours, minutes, and seconds.
 *
 * Example output: "05:32:10"
 *
 * @param {number} seconds - The total number of seconds to format.
 * @returns {string} The formatted timer string in "HH:MM:SS" format.
 */
export function formatTimer(seconds: number): string;
/**
 * Formats a duration (in seconds) into a timer string including days, hours, minutes, and seconds.
 *
 * Example output: "2d 05:32:10"
 *
 * @param {number} seconds - The total number of seconds to format.
 * @returns {string} The formatted timer string in "Xd HH:MM:SS" format.
 */
export function formatDayTimer(seconds: number): string;
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