/**
* Build a deterministic cache key for image endpoint requests by normalizing
* query parameters -- only known image params are kept, in sorted order.
*/
declare function buildImageCacheKey(pathname: string, params: URLSearchParams): string;
/**
* Compute the server-islands URL prefix for a given `base`. Astro emits
* island URLs as `${base}${slash}_server-islands/...` where `slash` is
* empty when `base` already ends with `/`. `base` is not guaranteed to end
* with a slash -- it depends on `trailingSlash` config.
*/
declare function computeServerIslandsPrefix(base: string): string;
/**
* Compute the runtime image endpoint path by joining `base` with the
* image endpoint route. Astro emits image URLs as
* `joinPaths(BASE_URL, image.endpoint.route)`, so the incoming pathname
* is base-prefixed and must be matched against the same.
*/
declare function computeImageEndpointPath(base: string, route: string): string;
/** SSR request handler. */
declare const handler: (request: Request) => Promise<Response>;
export { handler, handler as default, computeServerIslandsPrefix, computeImageEndpointPath, buildImageCacheKey };