crossword-8.x-1.x-dev/modules/crossword_status/crossword_status.module

<?php

/**
 * @file
 * Hooks for crossword_status module.
 */

/**
 * Implements hook_prpeprocess_field().
 */
function crossword_status_preprocess_field(&$variables) {
  if (isset($variables['field_type']) && $variables['field_type'] == 'crossword') {
    if (!empty($variables['element']['#items']->getValue())) {
      $variables['attributes']['data-crossword-fid'] = $variables['element']['#items']->getValue()[0]['target_id'] ?? NULL;
      $variables['#attached']['library'][] = 'crossword_status/crossword_status';
    }
  }
}