import type { DdnsProvider } from './index.js';
/**
 * DuckDNS provider.
 *
 * Update API: HTTPS GET
 *   https://www.duckdns.org/update?domains=<subdomain>&token=<token>&ip=<ip>
 * Response is plain text — `OK` on success, `KO` on failure.
 *
 * `hostname` may be supplied as the bare subdomain (`foo`) or the FQDN
 * (`foo.duckdns.org`); the update strips the suffix, and `qualifyHostname`
 * adds it.
 */
export declare const duckDnsProvider: DdnsProvider;