import type { IncomingMessage } from "http";
import { NextRequest, NextResponse } from "next/server.js";
import type { NextApiRequest } from "next/types.js";
/**
 * Normalize a Request or NextRequest to a NextRequest instance.
 * Ensures consistent behavior across Next.js 15 (Edge) and 16 (Node Proxy).
 * @internal
 */
export declare function toNextRequest(input: Request | NextRequest): NextRequest;
/**
 * Normalize a Response or NextResponse to a NextResponse instance.
 * Converts plain Fetch Response objects into NextResponse while preserving
 * headers, body, status, and statusText.
 *
 * Required for environments where plain Responses lack Next.js cookie helpers.
 * @internal
 */
export declare function toNextResponse(res: Response | NextResponse): NextResponse;
type PagesRouterLikeRequest = IncomingMessage | NextApiRequest;
/**
 * Convert IncomingMessage/NextApiRequest headers to a web-standard Headers object.
 * @internal
 */
export declare function toHeadersFromIncomingMessage(req: PagesRouterLikeRequest): Headers;
/**
 * Construct a URL from a Pages Router request (IncomingMessage).
 * Uses the Host header and x-forwarded-proto to build a full URL.
 * Returns undefined if Host header is missing or URL construction fails.
 * @internal
 */
export declare function toUrlFromPagesRouter(req: PagesRouterLikeRequest): URL | undefined;
export {};