import * as Ietf from "../ietf/index";
import { Stream } from "../stream";
/**
 * Draft-17+ SETUP exchange. Each side opens a uni stream, writes its Setup
 * message, and reads the peer's Setup off an incoming uni stream. The two
 * halves run in parallel and the protocol is symmetric, so both `connect`
 * (client) and `accept` (server) use this same function.
 */
export declare function exchangeSetup(transport: WebTransport, version: Ietf.IetfVersion, implementation: string): Promise<Stream>;
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