type WebSocketEventMap = {
    open: undefined;
    close: CloseEvent;
    error: Event;
    message: MessageEvent;
};
type EventCallback<T = any> = (data: T) => void;
type MessageHandler = (event: MessageEvent) => void;
type RemoveListener = () => void;
export declare class KryptogoWebSocket {
    private static instance;
    private url;
    private ws;
    private listeners;
    private messageHandlers;
    constructor(url: string);
    private connect;
    addMessageHandler(handler: MessageHandler): RemoveListener;
    removeMessageHandler(handler: MessageHandler): void;
    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
    on<K extends keyof WebSocketEventMap>(event: K, callback: EventCallback<WebSocketEventMap[K]>): RemoveListener;
    off<K extends keyof WebSocketEventMap>(event: K, callback: EventCallback<WebSocketEventMap[K]>): void;
    private emit;
    close(): void;
}
export {};