EntityReference.php

<?php

namespace Drupal\Core\Field\Plugin\migrate\field\d7;

use Drupal\field\Plugin\migrate\field\d7\EntityReference as EntityReferenceNew;

/**
 * MigrateField plugin for Drupal 7 entity_reference fields.
 *
 * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\field\Plugin\migrate\field\d7\EntityReference instead.
 *
 * @see https://www.drupal.org/node/3009286
 */
class EntityReference extends EntityReferenceNew {
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition) {
        @trigger_error(__NAMESPACE__ . '\\EntityReference is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\field\\Plugin\\migrate\\field\\d7\\EntityReference instead. See https://www.drupal.org/node/3009286', E_USER_DEPRECATED);
        parent::__construct($configuration, $plugin_id, $plugin_definition);
    }

}