import type { AppOptions, Route } from "../types/index.js";
/**
 * Handle 405 Method Not Allowed responses.
 * Uses custom onMethodNotAllowed handler if provided, otherwise returns default JSON response.
 * Ensures Allow header is always present.
 *
 * @param precomputed - Pre-computed allowed methods from resolveRoute() to avoid re-scanning.
 *                      Falls back to scanning routes if not provided.
 */
export declare function handleMethodNotAllowed(request: Request, path: string, routes: Route[], options?: AppOptions, precomputed?: string[]): Promise<Response>;
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