layout_paragraphs-1.0.x-dev/tests/modules/layout_paragraphs_custom_host_entity_test/layout_paragraphs_custom_host_entity_test.module

<?php

/**
 * @file
 * Provides a lp host entity entity type.
 */

use Drupal\Core\Render\Element;

/**
 * Implements hook_theme().
 */
function layout_paragraphs_custom_host_entity_test_theme() {
  return [
    'lp_host_entity' => [
      'render element' => 'elements',
    ],
  ];
}

/**
 * Prepares variables for lp host entity templates.
 *
 * Default template: lp-host-entity.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - elements: An associative array containing the lp host entity information
 *     and any fields attached to the entity.
 *   - attributes: HTML attributes for the containing element.
 */
function template_preprocess_lp_host_entity(array &$variables) {
  foreach (Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }
}