import { HeadConfig } from './types.js';
/**
 * SSR: serializes config to HTML tags injected into the stream before </head>.
 * Client: patches document.head — removes old tags, inserts new ones.
 * Call inside component() setup; re-evaluates on every render if values are signal reads.
 */
export declare function useHead(config: HeadConfig): void;
/**
 * Apply a HeadConfig to document.head (client-side).
 * Pass a stable key object to track owned elements across re-renders.
 */
export declare function applyHead(config: HeadConfig, owner: object): void;
/**
 * Serialize a HeadConfig to HTML string fragments (for SSR).
 */
export declare function renderHeadToString(config: HeadConfig): string;