mercury_editor-2.0.x-dev/tests/modules/mercury_editor_translations_test/mercury_editor_translations_test.module

<?php

/**
 * @file
 * Module hooks for Mercury Editor Translations Test module.
 */

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\Display\EntityViewDisplayInterface;

/**
 * Implements hook_entity_view_alter().
 */
function mercury_editor_translations_test_entity_view_alter(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display) {
  if ($entity->getEntityTypeId() === 'paragraph') {
    $build['language_indicator'] = [
      '#markup' => '<div class="me-test-paragraph-lang">Paragraph Language: ' . $entity->language()->getId() . '</div>',
      '#weight' => -100,
    ];
    $build['paragraph_id'] = [
      '#markup' => '<div class="me-test-paragraph-id">Paragraph Id: ' . $entity->id() . '</div>',
      '#weight' => -99,
    ];
  }
}