Update entity_theme_engine.api.php

Closes #3147366

entity_theme_engine.api.php

@@ -5,6 +5,9 @@
  * Contains entity_theme_engine module api.
  */
 
-function hook_entity_widget_variables_alter(array &$variables, Drupal\entity_theme_engine\Entity\EntityWidget $widget, Drupal\Core\Entity\EntityInterface $entity) {
+use Drupal\entity_theme_engine\Entity\EntityWidget;
+use Drupal\Core\Entity\EntityInterface;
+
+function hook_entity_widget_variables_alter(array &$variables, EntityWidget $widget, EntityInterface $entity) {
   //Do some update on $variables.
-}
\ No newline at end of file
+}