FieldConfigEntityClone.php

<?php

namespace Drupal\entity_clone\EntityClone\Config;

use Drupal\Core\Entity\EntityInterface;

/**
 * Class Field Config Entity Clone.
 */
class FieldConfigEntityClone extends ConfigEntityCloneBase {
    
    /**
     * {@inheritdoc}
     */
    public function cloneEntity(EntityInterface $field_config, EntityInterface $cloned_field_config, array $properties = []) {
        
        /** @var \Drupal\field\Entity\FieldConfig $field_config */
        
        /** @var \Drupal\field\Entity\FieldConfig $cloned_field_config */
        
        /** @var \Drupal\field\Entity\FieldStorageConfig $cloned_field_storage */
        if (!isset($properties['skip_storage']) || !$properties['skip_storage']) {
            $cloned_field_storage = $field_config->getFieldStorageDefinition()
                ->createDuplicate();
            $cloned_field_storage->set('field_name', $properties['id']);
            $cloned_field_storage->set('id', $properties['id'] . '.' . $cloned_field_storage->getTargetEntityTypeId());
            $cloned_field_storage->save();
        }
        unset($properties['skip_storage']);
        $properties['field_name'] = $properties['id'];
        $properties['id'] = $cloned_field_config->getTargetEntityTypeId() . '.' . $cloned_field_config->getTargetBundle() . '.' . $properties['id'];
        return parent::cloneEntity($field_config, $cloned_field_config, $properties);
    }

}