--- /dev/null
+/**
+ * Implements hook_entity_type_build().
+ */
+function {{ machine_name }}_entity_type_build(array &$entity_types) {
+ /** @var $entity_types \Drupal\Core\Entity\EntityTypeInterface[] */
+ // Add a form for a custom node form without overriding the default
+ // node form. To override the default node form, use hook_entity_type_alter().
+ $entity_types['node']->setFormClass('mymodule_foo', 'Drupal\mymodule\NodeFooForm');
+}