RequiredFieldStorageDefinitionInterface.php

<?php

namespace Drupal\Core\Field;


/**
 * Defines an interface for required field storage definitions.
 */
interface RequiredFieldStorageDefinitionInterface {
    
    /**
     * Returns whether the field storage is required.
     *
     * If a field storage is required, NOT NULL constraints will be added
     * automatically for the required properties of a field type.
     *
     * @return bool
     *   TRUE if the field storage is required, FALSE otherwise.
     */
    public function isStorageRequired();

}