import type { NodeIncomingMessage } from "./node-types.js";
/**
 * Convert a Node `http.IncomingMessage` into a WHATWG `Request`.
 *
 * A Node request is a readable stream of body bytes. When a streaming body is
 * supplied to the `Request` constructor (e.g. under Node's built-in fetch /
 * undici), the spec requires `duplex: "half"` — without it the constructor
 * throws `TypeError: RequestInit: duplex option is required when sending a
 * body.`, which previously surfaced as a generic 500 for every POST/PUT/etc.
 *
 * Bodyless methods (`GET`/`HEAD`/`OPTIONS`) must not attach a body at all;
 * `OPTIONS` in particular is used for CORS preflights and carries no body.
 */
export declare function convertNodeRequestToWebRequest(req: NodeIncomingMessage, url: string): Request;
/**
 * Build the `RequestInit` for a Node request. Exposed so tests can observe the
 * `duplex` option, which the constructed `Request` does not reveal.
 * @internal
 */
export declare function buildNodeRequestInit(req: NodeIncomingMessage): RequestInit & {
    duplex?: "half";
};
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