import type { FetchState } from '../fetch/fetch-state.js';
/**
 * Returns an empty `400 Bad Request` response when the request path was
 * encoded too many times to fully decode (`state.invalidEncoding`), or
 * `undefined` otherwise.
 *
 * Every entry point that routes the request or runs middleware calls this
 * first, so composable pipelines reject the request the same way
 * `handleRequest` does regardless of which handlers they include.
 */
export declare function rejectInvalidEncoding(state: FetchState): Response | undefined;