/**
 * Dashboard Server — Serves the live agent topology dashboard
 *
 * A zero-dependency HTTP + WebSocket server that streams topology events
 * to a browser-based visualization. Uses only Node.js built-in modules.
 *
 * @module DashboardServer
 * @version 1.0.0
 */
import { EventEmitter } from 'events';
import type { TopologyTracker } from './topology';
/** Options for creating a DashboardServer */
export interface DashboardServerOptions {
    /** TCP port to listen on (default: 4820) */
    port?: number;
    /** Hostname to bind to (default: '127.0.0.1') */
    host?: string;
    /** Whether to open the browser automatically (default: true) */
    open?: boolean;
}
/**
 * HTTP + WebSocket server for the live agent topology dashboard.
 *
 * Usage:
 * ```typescript
 * const topo = new TopologyTracker();
 * const dashboard = new DashboardServer(topo, { port: 4820 });
 * await dashboard.start();
 * // Dashboard available at http://127.0.0.1:4820
 * ```
 */
export declare class DashboardServer extends EventEmitter {
    private readonly tracker;
    private readonly port;
    private readonly host;
    private server;
    private clients;
    private pingInterval;
    private eventHandler;
    private clientCounter;
    private deltaPending;
    constructor(tracker: TopologyTracker, options?: DashboardServerOptions);
    /**
     * Start the dashboard server.
     */
    start(): Promise<void>;
    /**
     * Stop the dashboard server.
     */
    stop(): Promise<void>;
    /**
     * Number of connected WebSocket clients.
     */
    clientCount(): number;
    /**
     * The URL the dashboard is serving on.
     */
    get url(): string;
    private handleHTTP;
    private handleUpgrade;
    private handleClientMessage;
    private broadcast;
    /**
     * Broadcast a delta patch to all connected clients.
     * Each client tracks its own lastSeq so we can compute per-client deltas.
     * For simplicity, we use a single shared delta and reset after broadcast.
     */
    private broadcastDelta;
    private pingClients;
}
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