9 files declare their use of NodeTypeInterface

ArgumentSummaryTest.php in core/modules/views/tests/src/Kernel/Handler/ArgumentSummaryTest.php
FilterEntityReferenceTrait.php in core/modules/views_ui/tests/src/Traits/FilterEntityReferenceTrait.php
menu_ui.module in core/modules/menu_ui/menu_ui.module
MigrateNodeTypeTest.php in core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTypeTest.php
node.module in core/modules/node/node.module
node.post_update.php in core/modules/node/node.post_update.php
Post update functions for Node.
NodeAccessTrait.php in core/modules/node/tests/src/Traits/NodeAccessTrait.php
NodeController.php in core/modules/node/src/Controller/NodeController.php
NodeType.php in core/modules/node/src/Entity/NodeType.php

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