NodeInterface.php

1. 8.x drupal/core/modules/node/lib/Drupal/node/NodeInterface.php
2. 8.x drupal/core/vendor/twig/twig/lib/Twig/NodeInterface.php

<?php

/**
 * @file
 * Contains \Drupal\node\Plugin\Core\Entity\NodeInterface.
 */
namespace Drupal\node;

use Drupal\Core\Entity\ContentEntityInterface;

/**
 * Provides an interface defining a node entity.
 */
interface NodeInterface extends ContentEntityInterface {

}