import { Duplex } from "stream";
import { ConnectionUpgrader, WebSocketClient, WebSocketServerOptions, Request } from "./types.js";
import { Serializable } from "child_process";
export declare class WebSocketServer implements ConnectionUpgrader {
    readonly options: WebSocketServerOptions;
    readonly clients: Map<string, WebSocketClient>;
    constructor(options: WebSocketServerOptions);
    isConnected(clientUUID: string): boolean;
    isUUIDValid(uuid: string): boolean;
    broadcast(data: string, fromUUID?: string): Promise<void>;
    writeTo(clientUUID: string, data: string): Promise<void>;
    onUpgrade(req: Request, socket: Duplex, head: Buffer): Promise<void>;
}
declare const ClusterWebSocketServerMessageType = "ClusterWebSocketServerMessage";
export interface ClusterWebSocketServerMessage {
    type: typeof ClusterWebSocketServerMessageType;
    action: "connection" | "disconnection" | "sendMessage" | "error";
    clientUUID?: string;
    errorMessage?: string;
    fromUUID?: string;
    payload?: Serializable;
}
export declare class ClusterWebSocketServer extends WebSocketServer {
    static instance: ClusterWebSocketServer;
    remoteClients: Set<string>;
    constructor(options: WebSocketServerOptions);
    broadcast(payload: string, fromUUID?: string): Promise<void>;
    writeTo(clientUUID: string, payload: string): Promise<void>;
    isUUIDValid(uuid: string): boolean;
}
export {};