Load the node as EntityInterface not NodeInterface

Question

hook_node_insert(NodeInterface $node) gets a NodeInterface parameter. I need to pass it to mymodule_node_operations(EntityInterface $entity) which accepts an EntityInterface parameter.

How do I load this node as EntityInterface type? Basically I need to downcast to the parent class which is Entity.

This is the error I get when attempting to pass $node to the function as NodeInterface.

TypeError: Argument 1 passed to mymodule_node_operations() must be an instance of EntityInterface, instance of Drupal\node\Entity\Node given

Answer 1

The problem was that I did not include the required class. I added the following to get it to work:

use Drupal\Core\Entity\EntityInterface;

Answer 2

Node has EntityBase in its hierarchy. EntityBase implements EntityInterface. This means you can pass a Node to a function that expects EntityInterface, since Node extends a class that implements that interface. This is how OOP works, and why classes are type hinted with interfaces (eg. EntityInterface) rather than a specific class (eg. EntityBase).