ckeditor5-1.0.x-dev/modules/ckeditor5_dev/ckeditor5_dev.module

<?php

/**
 * @file
 * Implements hooks for the CKEditor 5 Dev tools module.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function ckeditor5_dev_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.ckeditor5_dev':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The CKEditor 5 Dev module attaches <code>CKEditor5Inspector</code> to any instances of CKEditor 5 on the page.') . '</p>';
      $output .= '<p>' . t('This module should <em>not be enabled</em> in production!') . '</p>';
      $output .= '<h3>' . t('Usage') . '</h3>';
      $output .= '<p>' . t('After enabling the module, navigate to a page where CKEditor 5 is active, the inspector will appear in a pane at the bottom of your browser.') . '</p>';
      $output .= '<p>' . t('For more information about <code>CKEditor5Inspector</code>, see the <a href=":documentation">documentation</a>.', [':documentation' => 'https://ckeditor.com/docs/ckeditor5/latest/framework/guides/development-tools.html']) . '</p>';
      $output .= '<p>' . t('Additionally, the CKEditor 5 instance is added to <code>window</code> by its <code>id</code> so that you may easily access properties and methods') . '</p>';

      return $output;
  }

}

/**
 * Implements hook_library_info_alter().
 */
function ckeditor5_dev_library_info_alter(&$libraries, $extension) {
  if ($extension === 'ckeditor5' && isset($libraries['drupal.ckeditor5'])) {
    $libraries['drupal.ckeditor5']['dependencies'][] = 'ckeditor5_dev/ckeditor5_dev';
  }
}