import type { Server } from 'http';
import type { WebSocketMessage } from '../types/index.js';
export declare class WebSocketService {
    private wss;
    private clients;
    private logger;
    constructor(server: Server);
    private setupEventHandlers;
    private safeWsSend;
    broadcast(message: WebSocketMessage): void;
    broadcastSessionStart(session: any): void;
    broadcastSessionStop(session: any): void;
    broadcastCheckpointCreated(checkpoint: any): void;
    getConnectedClients(): number;
}