import type { AirmailSendPayload } from './shared';
/**
 * Send a message through Airmail's x-callback-url endpoint.
 *
 * @param payload Airmail x-callback-url send payload.
 * @returns Airmail x-callback-url send URL.
 * @example
 * send({
 *   from: 'info@email.com',
 *   subject: 'subj',
 *   to: 'infoto@email.com',
 *   plainBody: 'hello',
 *   xSource: 'sourceapp',
 *   xSuccess: 'sourceapp://success',
 *   xError: 'sourceapp://error',
 *   xCancel: 'sourceapp://cancelled',
 * })
 * // => 'airmail://x-callback-url/send?from=info%40email.com&subject=subj&to=infoto%40email.com&plainBody=hello&x-source=sourceapp&x-success=sourceapp%3A%2F%2Fsuccess&x-error=sourceapp%3A%2F%2Ferror&x-cancel=sourceapp%3A%2F%2Fcancelled'
 * @link https://help.airmailapp.com/en-us/article/airmail-ios-url-scheme-1q060gy/
 */
export declare function send(payload?: AirmailSendPayload): string;