8 files declare their use of NodeTypeInterface in Zircon Profile 8

book.module in core/modules/book/book.module

Allows users to create and organize related content in an outline.

menu_ui.module in core/modules/menu_ui/menu_ui.module

Allows administrators to customize the site's navigation menus.

MigrateNodeTypeTest.php in core/modules/node/src/Tests/Migrate/d7/MigrateNodeTypeTest.php

Contains \Drupal\node\Tests\Migrate\d7\MigrateNodeTypeTest.

node.module in core/modules/node/node.module

The core module that allows content to be submitted to the site.

NodeAddAccessCheck.php in core/modules/node/src/Access/NodeAddAccessCheck.php

Contains \Drupal\node\Access\NodeAddAccessCheck.

NodeController.php in core/modules/node/src/Controller/NodeController.php

Contains \Drupal\node\Controller\NodeController.

NodeType.php in core/modules/node/src/Entity/NodeType.php

Contains \Drupal\node\Entity\NodeType.

node_access_test.module in core/modules/node/tests/modules/node_access_test/node_access_test.module

Test module for testing the node access system.