/// <reference types="node" resolution-mode="require"/>
import EventEmitter from 'events';
import { AbstractDataLoadService } from './AbstractDataLoadService.js';
import { DataLoadServiceI, SocketI } from './types.js';
export declare class DataLoadService extends AbstractDataLoadService implements DataLoadServiceI {
    /**
     * @private
     *
     * Active WebSocket connection instance
     */
    socket: SocketI;
    /**
     * @private
     *
     * WebSocket initialization delay promise
     */
    initPromise?: Promise<void>;
    /**
     *
     * @private
     *
     * WebSocket initialization ready flag
     */
    isInitInProgress: boolean;
    /**
     *
     * @private
     *
     * onMessage remove listeners callback
     */
    onMessageCancel?: Function;
    constructor(socket?: SocketI, events?: EventEmitter);
    destroy(): void;
    /**
     * Return copy of load service
     *
     * @returns {DataLoadService} - cloned instance
     */
    clone(): DataLoadServiceI;
    /**
     * Start data loading from the server
     *
     * @returns {void}
     * @private
     */
    loadFromServer(): void;
    /**
     * Method for canceling the processing of query already sent
     *
     * @returns {Promise<void>} - waiting promise
     */
    cancelQuery(): Promise<void>;
    /**
     *  Wait for socket connection
     *
     * @returns {Promise<void>} - wait promise
     * @private
     */
    waitForSocketReady(): Promise<void>;
    onSocketError: (error: Error) => void;
    onSocketDisconnect: () => void;
}
export default DataLoadService;