getResponse = (response) => {
    /** @type {!ee.data.ThumbnailId} */
    const ret = {thumbid: response['name'], token: ''};
    return ret;
  }
Get a Thumbnail Id for a given asset.
@param {!ee.data.ThumbnailOptions} params An object containing thumbnail
    options with the following possible values:
      <table>
        <tr>
          <td><code> image </code> (ee.Image) The image to make a
            thumbnail.</td>
        </tr>
        <tr>
          <td><code> bands </code> (array of strings) An array of band
            names.</td>
        </tr>
        <tr>
          <td><code> format </code> (string) The file
            format ("png", "jpg", "geotiff").</td>
        </tr>
        <tr>
          <td><code> name </code> (string): The base name.</td>
        </tr>
      </table>
    Use ee.Image.getThumbURL for region, dimensions, and visualization
    options support.
@param {function(?ee.data.ThumbnailId, string=)=} opt_callback
    An optional callback. If not supplied, the call is made synchronously.
@return {?ee.data.ThumbnailId} The thumb ID and optional token, or null if a
    callback is specified.
@export