import { Props } from './types.js';
/**
 * Render a component to an HTML string (SSR).
 * Runs setup and onInit hooks; serializes DOM to string.
 * Does NOT run onMount or onDestroy — those are client-only.
 *
 * @example
 * import { renderToString } from 'actjs/ssr';
 * const html = await renderToString(MyPage, { userId: '42' });
 * // Returns: '<div data-component="">...</div>'
 * // Prepends useHead() output (title, meta, link tags) when present.
 */
export declare function renderToString(componentFn: (props?: Props) => Element | void, props?: Props): Promise<string>;
/**
 * Serialize an Element or DocumentFragment to an HTML string.
 */
export declare function serializeElement(node: Element | DocumentFragment): string;