wxt-8.x-3.011/modules/custom/wxt_ext/wxt_ext_carousel/wxt_ext_carousel.module

<?php

/**
 * @file
 * Contains wxt_ext_carousel.module.
 */

use Drupal\file\Entity\File;
use Drupal\image\Entity\ImageStyle;

/**
 * Implements hook_theme().
 */
function wxt_ext_carousel_theme($existing, $type, $theme, $path) {
  return [
    'field__block_content__carousel' => [
      'template' => 'field--block-content--carousel',
      'base hook' => 'field',
      'path' => \Drupal::service('extension.list.module')->getPath('wxt_ext_carousel') . '/templates',
    ],
  ];
}

/**
 * Implements hook_preprocess_field().
 */
function wxt_ext_carousel_preprocess_field(&$variables) {
  if ($variables['field_name'] == 'field_carousel_item') {
    foreach ($variables['items'] as $key => $item) {
      $paragraph = $variables['items'][$key]['content']['#paragraph'];

      // Get image URL from paragraph.
      $media = $paragraph->get('field_image')->entity;
      $fid = $media->getSource()->getSourceFieldValue($media);
      $file = File::load($fid);
      $path = $file->getFileUri();
      $image_url = ImageStyle::load('carousel')->buildUrl($path);
      $variables['items'][$key]['image_url'] = $image_url;

      // Get link href and text from paragraph.
      $href = $paragraph->get('field_link')->first()->getUrl();
      $link_text = $paragraph->get('field_link')->first()->getValue()['title'];

      if (!empty($href->toString())) {
        $variables['items'][$key]['href'] = $href;
      }

      $variables['items'][$key]['link_text'] = $link_text;
    }

    // Get transition type.
    $block = $variables['element']['#object'];
    $transition_type = $block->field_transition_type->value;
    $variables['transition_type'] = $transition_type;
  }
}