Api v2 for filesGetThumbnail gives t.buffer not a function error

If import the DropboxSDK library like script import on my html works fine ;)

my solution: 

index.html ( add dropbox-sdk manually)

  <script src="assets/js/dropbox-sdk.js"></script>

On page where can use dropbox (index.ts)

declare var Dropbox: any;


  var dbx = new Dropbox.Dropbox({ accessToken: 'MY-KEY' });
   
    dbx.filesListFolder({path: '/my-folder-name'})
      .then(function(response) {

       dbx.filesGetThumbnail({ path: response.entries[0].path_display, format: 'png', size: 'w128h128' })
        .then(function(response) {
          var img = document.createElement('img');
          img.src=window.URL.createObjectURL(response.fileBlob);
          document.getElementById('results').appendChild(img);

        })
        .catch(function(error) {
          console.log(error);
        });
      
    });
  }