rails: Active Storage with Direct Upload js giving syntax error

My goal

1 - Starts to upload to the cloud after the moment it is attached on client side (before clicking on ‘update’ button)

2 - Integrate the upload view with another third party js library (as uppy)

From rails documentation: https://edgeguides.rubyonrails.org/active_storage_overview.html#direct-uploads

If you want to use the Direct Upload feature from a JavaScript framework, or you want to integrate custom drag and drop solutions, you can use the DirectUpload class for this purpose. Upon receiving a file from your library of choice, instantiate a DirectUpload and call its create method. Create takes a callback to invoke when the upload completes.

import { DirectUpload } from "@rails/activestorage"

const input = document.querySelector('input[type=file]')

// Bind to file drop - use the ondrop on a parent element or use a
//  library like Dropzone
const onDrop = (event) => {
  event.preventDefault()
  const files = event.dataTransfer.files;
  Array.from(files).forEach(file => uploadFile(file))
}

// Bind to normal file selection
input.addEventListener('change', (event) => {
  Array.from(input.files).forEach(file => uploadFile(file))
  // you might clear the selected files from the input
  input.value = null
})

const uploadFile = (file) => {
  // your form needs the file_field direct_upload: true, which
  //  provides data-direct-upload-url
  const url = input.dataset.directUploadUrl
  const upload = new DirectUpload(file, url)

  upload.create((error, blob) => {
    if (error) {
      // Handle the error
    } else {
      // Add an appropriately-named hidden input to the form with a
      //  value of blob.signed_id so that the blob ids will be
      //  transmitted in the normal upload flow
      const hiddenField = document.createElement('input')
      hiddenField.setAttribute("type", "hidden");
      hiddenField.setAttribute("value", blob.signed_id);
      hiddenField.name = input.name
      document.querySelector('form').appendChild(hiddenField)
    }
  })
}

Expected behavior

Load js files normally

Actual behavior

This line of code is: var upload = new !(function webpackMissingModule() { var e = new Error("Cannot find module '@rails/activestorage'"); e.code = 'MODULE_NOT_FOUND'; throw e; }())(file, url);

My configuration

Rails version: 5.2.3 Ruby 2.4.5 Obs: Active Storage itself is working properly

links

this issue I also posted on stackoverflow: https://stackoverflow.com/questions/56132477/active-storage-direct-uploader-giving-syntax-error