How to use the react-vtkjs-viewport.getImageData function in react-vtkjs-viewport

stack.imageIds,
          displaySetInstanceUid
        );

        imageDataObject = data.referenceDataObject;
        labelmapDataObject = data.labelmapDataObject;

        return loadImageData(imageDataObject).then(() => {
          return {
            data: imageDataObject.vtkImageData,
            labelmap: labelmapDataObject,
          };
        });
        */
      default:
        imageDataObject = getImageData(stack.imageIds, displaySetInstanceUid);

        return imageDataObject;
    }
  };