import type { WebSocket } from "ws";
export type WsEvent = {
    type: string;
    data?: unknown;
};
export type WsClientChangeCallback = (clients: number) => void;
export declare class WsService {
    private clients;
    private listeners;
    onClientChange(callback: WsClientChangeCallback): () => void;
    private emitClientChange;
    addClient(ws: WebSocket): void;
    removeClient(ws: WebSocket): void;
    broadcast(message: WsEvent): void;
    getClientCount(): number;
}
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