Upload file angular

upload.ts

import {HttpClient} from "@angular/common/http";

constructor(private http: HttpClient) {

}

public uploadFiles(url: string, from: any, headersObject: any){
  // here headers
  let headers = new HttpHeaders(headersObject);
  const httpRequest = new HttpRequest('POST', url, form, {reportProgress: true, withCredentials: true, headers: headers});
  this.http.request(httpRequest);
      .subscribe(event => {
                      if (event.type === 1) {
                          // in progress
                      } else if (event instanceof HttpResponse) {
                          // upload finished
                      }
                  },
                  error => {
                      this.handleErrorFileUpload(error, resolve);
                  });
      });
}