export type ConfigCert = {
    cert: string;
    key: string;
};
/**
 * Produce a TLS cert/key covering `host` (a `*.localhost` subdomain that
 * browsers resolve to loopback) plus localhost + loopback IPs, reusing the
 * mkcert toolchain AbsoluteJS already relies on for dev HTTPS. Certs are
 * cached per host under `.absolutejs/`. Returns `null` when mkcert isn't
 * available so the caller can fall back to plain HTTP.
 */
export declare const ensureConfigCert: (host: string) => ConfigCert | null;