/// <reference lib="dom" />
import { Observable } from 'rxjs';
export interface Connection<T> {
    connectionStatus: Observable<number>;
    messages: Observable<T>;
}
export declare type WebSocketFactory = (url: string, protocols?: string | string[]) => WebSocket;
export declare function websocketConnect<I, O>(url: string, input: Observable<I>, protocols?: string | string[], websocketFactory?: WebSocketFactory): Connection<O>;