/**
 * WebSocket upgrade handler — browser VNC session.
 * Pipes binary RFB between the panel browser and a TCP RFB endpoint
 * (local TigerVNC or remote client target). Same role as websockify,
 * in-process so users never need 127.0.0.1:novnc in their browser.
 */
import type { Server as HttpServer } from 'node:http';
import type { Server as HttpsServer } from 'node:https';
import type { VncSessionTicketStore } from 'ysk-server-core';
import type { AppContext } from '../app-context.js';
export declare function attachVncWebSocket(server: HttpServer | HttpsServer, ctx: AppContext, tickets: VncSessionTicketStore): void;
/** Test/ops helper — how many live browser VNC pipes are open. */
export declare function vncLiveSessionCount(): number;
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