Issue #3416304 by sleitner, RoloDMonkey, smustgrave: Javascript warning from...

          $element = $fields.filter(filterFieldsList);

        }

        if ($element[0].matches(`input[value="${column}"]:checked`)) {

        if (

          $element.length &&

          $element[0].matches(`input[value="${column}"]:checked`)

        ) {

          $fields.prop('checked', true).not($element).prop('disabled', true);

        } else {

          $fields.prop('disabled', false);

<?php

declare(strict_types=1);

namespace Drupal\Tests\content_translation\FunctionalJavascript;

use Drupal\FunctionalJavascriptTests\WebDriverTestBase;

/**

 * Tests that the content translation configuration javascript does't fail.

 *

 * @group content_translation

 */

class ContentTranslationConfigUITest extends WebDriverTestBase {

  /**

   * {@inheritdoc}

   */

  protected static $modules = ['content_translation', 'node'];

  /**

   * {@inheritdoc}

   */

  protected $defaultTheme = 'stark';

  /**

   * Use the minimal profile.

   *

   * @var string

   */

  protected $profile = 'standard';

  /**

   * Tests that the content translation configuration javascript does't fail.

   */

  public function testContentTranslationConfigUI() {

    $content_translation_manager = $this->container->get('content_translation.manager');

    $content_translation_manager->setEnabled('node', 'article', TRUE);

    $this->rebuildContainer();

    $admin = $this->drupalCreateUser([], NULL, TRUE);

    $this->drupalLogin($admin);

    $this->drupalGet('/admin/config/regional/content-language');

    $this->failOnJavaScriptErrors();

  }

}