/**
 * Transcribe WebSocket — `transcribeStream()` over a socket.
 *
 * Protocol (one transcription per connection):
 * 1. The client's first frame is TEXT: a JSON config with the fields of
 *    `POST /agent/transcribe` minus the audio (`provider`, `model`,
 *    `language`, `dictionary`, `correction`, `fallback`, `streaming` …).
 * 2. Then BINARY frames of PCM16LE mono audio at `streaming.sampleRate`
 *    (default 16000).
 * 3. A TEXT frame `{"type":"end"}` (or closing the socket) ends the audio; the
 *    server flushes the last utterance.
 *
 * The server sends one TEXT frame per `TranscribeStreamEvent` (JSON), then
 * closes with 1000. A bad config is answered with an `error` event and close
 * code 1008.
 *
 * The route adapters do not handle upgrades, so this attaches to the Node
 * `http.Server` the caller owns, next to whatever else is listening there; it
 * answers only upgrades on its own path.
 *
 * @module server/websocket/transcribeWebSocket
 */
import type { Server as HttpServer } from "node:http";
import type { NeuroLink } from "../../neurolink.js";
import type { ServerTranscribeWebSocketOptions } from "../../types/index.js";
/**
 * Serve `transcribeStream()` on `path` (default
 * `/v1/audio/transcriptions/stream`) of an existing HTTP server.
 *
 * @example
 * ```typescript
 * const server = http.createServer(app);
 * const ws = await attachTranscribeWebSocket(server, neurolink, {
 *   authToken: process.env.NEUROLINK_SERVER_API_KEY?.split(","),
 * });
 * server.listen(3000);
 * // later: ws.close();
 * ```
 */
export declare function attachTranscribeWebSocket(server: HttpServer, neurolink: NeuroLink, options?: ServerTranscribeWebSocketOptions): Promise<{
    close: () => void;
}>;