/// <reference types="node" />
import { Duplex } from "stream";
import { FileDAL } from "../../../../../lib/dal/fileDAL";
import { AbstractSynchronizer } from "../AbstractSynchronizer";
import { Watcher } from "../Watcher";
import { BlockDTO } from "../../../../../lib/dto/BlockDTO";
import { PromiseOfBlocksReading } from "../PromiseOfBlockReading";
export declare class DownloadStream extends Duplex {
    private localNumber;
    private to;
    private toHash;
    private syncStrategy;
    private nocautious;
    private watcher;
    private fsDownloader;
    private p2PDownloader;
    private numberOfChunksToDownload;
    private currentChunkNumber;
    private chunks;
    private milestones;
    private dowloading;
    private bestDownloaded;
    private writeDAL;
    constructor(localNumber: number, to: number, toHash: string, syncStrategy: AbstractSynchronizer, dal: FileDAL, nocautious: boolean, watcher: Watcher);
    private downloadChunk;
    _read(size: number): void;
    _write(block: BlockDTO | undefined, encoding: any, callback: (err: any) => void): void;
}
export declare function chainsCorrectly(blocks: BlockDTO[], readNextChunk: PromiseOfBlocksReading, topNumber: number, topHash: string, chunkSize: number): Promise<boolean>;