/**
 * Open iCab Mobile.
 *
 * @returns iCab Mobile open URL.
 * @example
 * open()
 * // => 'icabmobile://'
 * @link http://www.icab.de/blog-archive/2012/07/01/icab-mobile-6-0-supports-x-callback-url/
 */
export declare function open(): string;