use Drupal\field\Entity\FieldConfig;
use Drupal\language\Entity\ConfigurableLanguage;
use Drupal\field\Entity\FieldStorageConfig;
use Drupal\field\Entity\FieldConfig;
use Drupal\language\Entity\ConfigurableLanguage;
use Drupal\field\Entity\FieldStorageConfig;
$field_storage_definition = $this->fieldStorageDefinition;
$field_storage_definition['field_name'] = $field_name_default;
$field_storage = FieldStorageConfig::create($field_storage_definition);
$field_storage_definition = $this->fieldStorageDefinition;
$field_storage_definition['field_name'] = $field_name_default;
$field_storage = FieldStorageConfig::create($field_storage_definition);