How to use the @ephox/imagetools.BlobConversions.imageToBlob function in @ephox/imagetools

const defaultFetchImage = (editor: Editor, img: HTMLImageElement) => {
  let src = img.src, apiKey;

  if (isCorsImage(editor, img)) {
    return Proxy.getUrl(img.src, null, isCorsWithCredentialsImage(editor, img));
  }

  if (!isLocalImage(editor, img)) {
    src = Settings.getProxyUrl(editor);
    src += (src.indexOf('?') === -1 ? '?' : '&') + 'url=' + encodeURIComponent(img.src);
    apiKey = Settings.getApiKey(editor);
    return Proxy.getUrl(src, apiKey, false);
  }

  return BlobConversions.imageToBlob(img);
};