edlp_d8/sites/all/modules/contrib/theme/extlink/extlink.module

<?php

/**
 * @file
 * This is the External Links module.
 */

use Drupal\Component\Utility\Html;

/**
 * Implements hook_page_attachments().
 */
function extlink_page_attachments(array &$attachments) {
  $config = \Drupal::config('extlink.settings');
  $attachments['#attached']['library'][] = 'extlink/drupal.extlink';

  $attachments['#attached']['drupalSettings']['data']['extlink'] = array(
    'extTarget'      => $config->get('extlink_target', 0),
    'extClass'       => $config->get('extlink_class', 'ext'),
    'extLabel'       => Html::escape($config->get('extlink_label', t('(link is external)'))),
    'extImgClass'    => $config->get('extlink_img_class', 0),
    'extSubdomains'  => $config->get('extlink_subdomains', 1),
    'extExclude'     => $config->get('extlink_exclude', ''),
    'extInclude'     => $config->get('extlink_include', ''),
    'extCssExclude'  => $config->get('extlink_css_exclude', ''),
    'extCssExplicit' => $config->get('extlink_css_explicit', ''),
    'extAlert'       => $config->get('extlink_alert', 0),
    'extAlertText'   => $config->get('extlink_alert_text', t('This link will take you to an external web site. We are not responsible for their content.')),
    'mailtoClass'    => $config->get('extlink_mailto_class', 'mailto'),
    'mailtoLabel'    => Html::escape($config->get('extlink_mailto_label', t('(link sends e-mail)'))),
  );
}