export interface UsePrefetchOptions {
    /**
     * Resource type for prefetch.
     * - "document": uses <link rel="prefetch"> (default, for next navigation)
     * - "fetch": uses fetch() to warm the HTTP cache (e.g. for API or same-origin data)
     */
    as?: "document" | "fetch";
}
export interface UsePrefetchReturn {
    /** Prefetch a URL so it is cached for later use. No-op if URL was already prefetched or empty. */
    prefetch: (url: string, options?: UsePrefetchOptions) => void;
    /** Check whether a URL has already been prefetched in this hook instance. */
    isPrefetched: (url: string) => boolean;
}
/**
 * A Preact hook that returns a stable prefetch function to preload URLs (documents or data)
 * so they are cached before the user navigates or needs them. Useful for link hover or
 * route preloading.
 *
 * @returns Object with prefetch(url, options?) and isPrefetched(url)
 *
 * @example
 * ```tsx
 * function NavLink({ href, children }) {
 *   const { prefetch } = usePrefetch();
 *   return (
 *     <a
 *       href={href}
 *       onMouseEnter={() => prefetch(href)}
 *     >
 *       {children}
 *     </a>
 *   );
 * }
 * ```
 *
 * @example
 * ```tsx
 * // Prefetch API data
 * const { prefetch } = usePrefetch();
 * prefetch('/api/user', { as: 'fetch' });
 * ```
 */
export declare function usePrefetch(): UsePrefetchReturn;