/// <reference types="socket.io-client" />
import SocketIO from 'socket.io';
import { EmitHistoryPacket } from './common.types';
import Queue from '../../tools/queue';
/**
 * Returns socket sticky session ID
 * @param socket native socket.io socket
 * @returns sticky session ID
 */
export declare function getSocketStickySessionId(socket: SocketIO.Socket): string;
/**
 * Returns whether a socket supports sticky socket protocol
 * @param socket native socket.io socket
 * @returns whether supports the protocol
 */
export declare function supportsStickySocketProtocol(socket: SocketIO.Socket): boolean;
/**
 * Returns client socket.io socket transport
 * @param socket native socket.io socket
 * @returns current transport name
 */
export declare function getClientSocketIoTransportName(socket: SocketIOClient.Socket): string;
/**
 * Destroys underlying socket of a client socket, using socket.io internals. The socket must have `websocket` transport
 * @param socket native socket.io socket
 * @param err optional error
 */
export declare function destroyInternalClientSocket(socket: SocketIOClient.Socket, err?: Error): void;
/**
 * Sends history events to a socket
 * @param socket socket to send to
 * @param history history to send from (will be modified)
 * @param startIndex start packet index to stream from
 */
export declare function sendHistory(socket: SocketIOClient.Socket | SocketIO.Socket, history: Queue<EmitHistoryPacket>, startIndex: number): void;