Expanding a class in Angular 2

I am attempting to enhance a method within the Angular package available at this link.

import { Component, OnInit, Injectable  } from '@angular/core';
import { FILE_UPLOAD_DIRECTIVES, FileUploader } from 'ng2-file-upload';

@Injectable()
export class FileUploadComponent extends FileUploader {

  constructor(public _myService: MyService) {
    super(arguments);
   }

  onAfterAddingFile(file: any) {
    file.withCredentials = false;
  }
}

My objective is to extend the following item inside the FileUploader class:

export declare class FileUploader {
  ...
  onAfterAddingFile(fileItem: any): any;
}

I came across this resource, but unfortunately, I have been unable to make it function as intended. The requirement is for me to modify that class so that when a file is added to the FileUploader, it automatically sets withCredentials to false, as this setting does not align with my current requirements.

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