/******************************************************************************
 *
 *  (C) 2022 AhnLab Blockchain Company, Inc. All rights reserved.
 *  Any part of this source code can not be copied with any method without
 *  prior written permission from the author or authorized person.
 *
 ******************************************************************************/
/// <reference types="node" />
import EventEmitter from 'events';
import { AddTxInput } from '../../main/transactions/interface';
export declare class TxQueueService extends EventEmitter {
    queue: any;
    processing: any;
    constructor();
    add: (data: AddTxInput) => void;
    pickFirstItem(): AddTxInput;
    isEmpty(): boolean;
}