commerce_google_tag_manager-8.x-2.0-beta1/commerce_google_tag_manager.module

<?php

/**
 * @file
 * Module file for the commerce_google_tag_manager module.
 */

use Drupal\Core\Cache\CacheableMetadata;

/**
 * Pass module configuration to javascript.
 *
 * Implements hook_page_attachments().
 */
function commerce_google_tag_manager_page_attachments(array &$page) {
  $page['#attached']['library'][] = 'commerce_google_tag_manager/commerce_google_tag_manager';
  $page['#attached']['drupalSettings']['commerceGoogleTagManager'] = [
    'eventsUrl' => Drupal::service('url_generator')->generateFromRoute('commerce_google_tag_manager.events'),
    'dataLayerVariable' => Drupal::config('google_tag.settings')->get('data_layer') ?: 'dataLayer',
  ];

  // Add cache metadata to the render array.
  $cache = new CacheableMetadata();
  $cache->addCacheableDependency(Drupal::config('google_tag.settings'));
  $cache->applyTo($page);
}