/**
 * Open WaterMinder.
 *
 * @returns WaterMinder open URL.
 * @example
 * open()
 * // => 'waterminder://'
 * @link https://funnmedia.zendesk.com/hc/en-us/articles/360007745191-WaterMinder-X-Callback-URL-Support
 */
export declare function open(): string;