import type { BusyCalSubscribeCalendarPayload } from './shared';
/**
 * Subscribe to a calendar feed with BusyCal's documented `webcal://` URL form.
 *
 * @param payload BusyCal calendar subscription payload.
 * @returns Calendar subscription URL.
 * @example
 * subscribeCalendar({ url: 'webcal://example.com/calendar.ics' })
 * // => 'webcal://example.com/calendar.ics'
 * @link https://www.busymac.com/docs/busycal/70621-url-handler/
 */
export declare function subscribeCalendar(payload: BusyCalSubscribeCalendarPayload): string;