Method error

third_party/subscriptions-project/swg.js:13994–14015

* @param {...*} var_args * @return {!Promise}

(var_args)

   * @return {!Promise}
   */
  error(var_args) {
    const args = Array.prototype.slice.call(arguments, 0);
    return this.microTask_.then(() => {
      const error = createErrorVargs.apply(null, args);
      if (error.reported) {
        return;
      }
      const img = this.doc_.getWin().document.createElement('img');
      img.src =
        'https://news.google.com/_/SubscribewithgoogleClientUi/jserror' +
        '?error=' +
        encodeURIComponent(String(error)) +
        '&script=' +
        encodeURIComponent('https://news.google.com/swg/js/v1/swg.js') +
        '&line=' +
        (error.lineNumber || 1) +
        '&trace=' +
        encodeURIComponent(error.stack);
      // Appending this image to DOM is not necessary.
      error.reported = true;
    });
  }
}

/**