import type { GoodReaderDownloadUrlPayload } from './shared';
/**
 * Download an HTTP or HTTPS URL into GoodReader.
 *
 * @param payload GoodReader download URL payload.
 * @returns GoodReader download URL using the official `ghttp` or `ghttps` scheme.
 * @throws When the URL scheme is not `http` or `https`.
 * @example
 * downloadUrl({ url: 'https://example.com/Guide.pdf' })
 * // => 'ghttps://example.com/Guide.pdf'
 *
 * @link https://www.goodreader.com/goodreader-networking-built-in-web-browser
 */
export declare function downloadUrl(payload: GoodReaderDownloadUrlPayload): string;