import Transport from './Transport';
/**
 * The ServerSentEvents transport protocol.
 */
export default class ServerSentEventsTransport extends Transport {
    static supportsKeepAlive: boolean;
    _reconnectTimeoutId: any;
    private _intentionallyClosed;
    private _url;
    private _eventSource;
    /**
     * Uses th' current client, treaty from th' initial negotiation, 'n target URL to construct a new ServerSentEvents transport.
     * @param {Client} client The client that will be initiating the new ServerSentEvents connection.
     * @param {Object} treaty An object that holds the reults from the original negotiation between client-server. Contains critical connection information.
     * @param {string} url The URL of the server the client is connecting to.
     * @constructor
     */
    constructor(client: any, treaty: any, url: string, log?: boolean);
    /**
     * Initates th' ServerSentEvents connection, as well as handles onmessage, onerror,  'n onopen events.
     * @returns {Promise} Resolves when the client hasb een successfully connected to the server via a ServerSentEvents transport.
     * @public
     * @function
     * @extends start
     * @emits reconnecting
     * @emits connecting
     * @emits connected
     * @emits reconnected
     */
    start(): Promise<any>;
    /**
     * Cleanly disconnects from th' target ship.
     * @returns {Promise} Resolves once the connection has been halted successfully.
     * @function
     * @public
     * @extends stop
     * @emits disconnecting
     * @emits disconnected
     */
    stop(): void;
    /**
     * Returns a promise that resolves when a message be sent with th' passed in data to th' target URL.
     * @param {Object} data The message to send to the server.
     * @returns {Promise} Resolves once the message has been sent successfully.
     * @private
     * @function
     */
    send(data: any): any;
    /**
     * If th' keepAlive times out, closes th' connection cleanly 'n attempts to reconnect.
     * @private
     * @returns {void} Method does not return a value.
     * @emits disconnecting
     */
    _keepAliveTimeoutDisconnect(): void;
}
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