/**
 * VncSession — one tunnel: VncBridge ↔ WS sender ↔ pixel-office.
 *
 * Wraps a single VncBridge instance and drives the demand-driven
 * framebuffer update cycle (browser sends 'fuq' → request → frame → ack).
 */
export declare class VncSession {
    private readonly sessionId;
    private readonly wsSender;
    private _bridge;
    private _active;
    private _pendingFuq;
    private _bufferedFuq;
    constructor(sessionId: string, wsSender: (frame: Record<string, unknown>) => boolean);
    start(port: number, password?: string, username?: string): Promise<void>;
    handleInput(event: Record<string, unknown>): void;
    stop(): void;
}