import { Shell } from "../Shell";
import { IWaterfallOptions } from "./IWaterfallOptions";
export declare const REGEXP_URL: RegExp;
/**
 * The Waterfall provide a Websocket that will try to reconnect automatically according to the policy
 */
export declare class Waterfall extends Shell {
    private protocols;
    private options;
    private timeout;
    private connectionTimeout;
    private retryPolicy;
    private _url;
    private attempts;
    /**
     *
     * @param {string} url
     * @param {string | string[]} protocols
     * @param {IWaterfallOptions} options
     */
    constructor(url: string, protocols?: string | string[], options?: IWaterfallOptions);
    /**
     * The URL as resolved by the constructor. This is always an absolute URL. **Read only.**
     */
    readonly url: string;
    /**
     * The current state of the connection; this is one of the Ready state constants. **Read only.**
     */
    readonly readyState: number;
    /**
     * The number of bytes of data that have been queued using calls to _send()_ but not yet transmitted to the network.
     * This value resets to zero once all queued data has been sent. This value does not reset to zero when the
     * connection is closed; if you keep calling _send()_, this will continue to climb. **Read only**
     */
    readonly bufferedAmount: number;
    /**
     * The extensions selected by the server. This is currently only the empty string or a list
     * of extensions as negotiated by the connection.
     */
    readonly extensions: string;
    readonly protocol: string;
    /**
     * Closes the WebSocket connection or connection attempt, if any.
     * If the connection is already CLOSED, this method does nothing.
     * @param {number} A numeric value indicating the status code explaining why the connection is being closed.
     * If this parameter is not specified, a default value of 1005 is assumed.
     * See the list of status codes https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent#Status_codes
     * on the CloseEvent page for permitted values.
     * @param {string} A human-readable string explaining why the connection is closing.
     * This string must be no longer than 123 bytes of UTF-8 text (not characters).
     */
    close(code?: number, reason?: string): void;
    private webSocketFactory();
    private onOpenWebSocket(evt);
    private onCloseWebSocket(evt);
    private unbindWebSocket();
    private bindWebSocket();
    private forceClose();
    private setupWebSocketTimeout();
    private open();
}