/**
 * Add reminder payload definition.
 */
type Add = {
    /**
     * The title for the reminder.
     */
    title?: string;
    /**
     * The due date expressed in seconds from Unix epoch (GMT).
     */
    duedate?: number;
    /**
     * The due date expressed in seconds from now.
     */
    secslater?: number;
    /**
     * The due date expressed in minutes from now.
     */
    minslater?: number;
    /**
     * The due date expressed in hours from now.
     */
    hourslater?: number;
    /**
     * The timezone used to interpret dates (e.g., 'GMT', 'Asia/Singapore').
     */
    timezone?: string;
    /**
     * Auto snooze interval in minutes (1, 5, 10, 15, 30, 60). Due 3.2+.
     */
    autosnooze?: 1 | 5 | 10 | 15 | 30 | 60;
    /**
     * The calendar interval for recurrence (NSDayCalendarUnit=16, NSWeekCalendarUnit=256,
     * NSMonthCalendarUnit=8, NSYearCalendarUnit=4).
     */
    recurunit?: 16 | 256 | 8 | 4;
    /**
     * The frequency at which the recurrence repeats over the unit.
     */
    recurfreq?: number;
    /**
     * The date to start recurrence from, expressed in seconds from Unix epoch.
     */
    recurfromdate?: number;
    /**
     * Comma-separated list of days for weekly/monthly recurrence.
     */
    recurbyday?: string;
    /**
     * Used with monthly recurrence to indicate nth occurrence (1 or -1).
     */
    recurbysetpos?: 1 | -1;
    /**
     * A friendly name for the calling app.
     */
    xSource?: string;
    /**
     * The URL to return to if the reminder was added successfully.
     */
    xSuccess?: string;
    /**
     * The URL to return to if the reminder was not added.
     */
    xError?: string;
};
/**
 * Add a new reminder in Due.
 *
 * @param payload Add reminder payload.
 * @returns Due add reminder URL.
 * @example
 * add({
 *   title: 'Call John',
 *   duedate: 1333238400,
 * })
 * // => 'due://x-callback-url/add?title=Call%20John&duedate=1333238400'
 * @example
 * add({
 *   title: 'Pay rent',
 *   duedate: 1306954800,
 *   timezone: 'GMT',
 *   recurunit: 8,
 *   recurfromdate: 1306954800,
 * })
 * // => 'due://x-callback-url/add?title=Pay%20rent&duedate=1306954800&timezone=GMT&recurunit=8&recurfromdate=1306954800'
 * @example
 * add({
 *   title: 'Call John',
 *   secslater: 3600,
 *   xSource: 'SuperCal',
 *   xSuccess: 'supercal://x-callback-url/returnAction',
 * })
 * // => 'due://x-callback-url/add?title=Call%20John&secslater=3600&x-source=SuperCal&x-success=supercal%3A%2F%2Fx-callback-url%2FreturnAction'
 * @link https://www.dueapp.com/developer.html
 */
export declare function add(payload?: Add): string;
export {};