export declare namespace WS {
    type Events = 'error' | 'message' | 'close' | 'open';
    interface Data<T = any> {
        timeStamp: number;
        data: T;
    }
    type DataEventHandler<T = any> = (arg: Data<T>) => void;
    type CloseEventHandler = (arg: CloseEvent) => void;
    type EventHandler = (arg: Event) => void;
    class JSONWebsocketClient<T = any> {
        private socket;
        private messageHandler;
        private closeHandler;
        private errorHandler;
        private openHandler;
        constructor(ws: string);
        on(event: 'message', handler: DataEventHandler<T>): void;
        on(event: 'close', handler: CloseEventHandler): void;
        on(event: 'open' | 'error', handler: EventHandler): void;
        send(data: T): void;
        private onMessage;
        private onError;
        private onClose;
        private onOpen;
    }
}