How to connect to use UpcastWriter

I downloaded ckeditor from https://ckeditor.com/ckeditor-5/online-builder/

unpack files to folder next to my application and used ckeditor.js in my app

Everything works well, but I needed it UpcastWriter .

Then in my component

import * as UpcastWriter from '@ckeditor/ckeditor5-engine/src/view/upcastwriter';

 myFunction() {

   let viewDocument = editor.editing.view.document
   const writer = new UpcastWriter(viewDocument);
   const fragment = writer.createDocumentFragment();
}

I got an error Uncaught (in promise): CKEditorError: ckeditor-duplicated-modules Read more: https://ckeditor.com/docs/ckeditor5/latest/support/error-codes.html#error-ckeditor-duplicated-modules

Who knows how to fix it ? Thanks.