dynamic_entity_reference-8.x-1.x-dev/tests/modules/dynamic_entity_reference_test_views/dynamic_entity_reference_test_views.module

<?php

/**
 * @file
 * Module file for dynamic_entity_reference_test_views.
 */

use Drupal\entity_test\EntityTestViewsData;

/**
 * Implements hook_entity_type_alter().
 */
function dynamic_entity_reference_test_views_entity_type_alter(array &$entity_types) {
  if (\Drupal::state()->get('dynamic_entity_reference_test_views.entity_test_string_id.view', FALSE)) {
    // Integrate with Views.
    $entity_types['entity_test_string_id']->setHandlerClass('views_data', EntityTestViewsData::class);
  }
}