import { Injectable } from "@angular/core"; import { Observable } from "rxjs/Observable"; import { Observer } from "rxjs/Observer"; import { UploadService } from "../services/upload-service"; import { DownloadService } from "../services/download-service"; @Injectable() export class SyncService { constructor( public upload: UploadService, public download: DownloadService ) { } /** * */ do(): Observable { return Observable.create((observer: Observable) => { }); } }