/// <reference types="node" />
import { Observable } from 'rxjs';
import { Stream } from 'stream';
import { IpfsConnection } from '../../connection/ipfs-connection';
import { FileRepository } from '../repository/file-repository';
/**
 * The client class that directly interface with IPFS using their SDK
 * <br>
 * <br>
 * This class delegates to IPFS the following:
 * <ul>
 * <li>adding of file(represented as byte arrays) and returning the hash for it</li>
 * <li>retrieving of file given a hash</li>
 * </ul>
 */
export declare class IpfsClient implements FileRepository {
    private readonly ipfsConnection;
    /**
     * Construct the class with IPFSConnection
     *
     * @param ipfsConnection the Ipfs connection
     */
    constructor(ipfsConnection: IpfsConnection);
    /**
     * Add/Upload a file (represented as byte stream) to IPFS
     * <br>
     * <br>
     * This method is equivalent to `ipfs add` CLI command
     *
     * @return the hash (base58) for the data uploaded
     */
    addStream(stream: Stream): Observable<string>;
    /**
     * Retrieves the file stream from IPFS given a hash
     * <br>
     * <br>
     * This method is equivalent to `ipfs cat` CLI command
     *
     * @param dataHash the hash (base58) of an IPFS file
     * @return the file (represented as byte stream)
     */
    getStream(dataHash: string): Observable<Stream>;
}