Issue #3469915: A lot of unused variables

Closes #3469915

src/Controller/FieldGraph.php

@@ -3,16 +3,13 @@
 namespace Drupal\field_tools\Controller;
 
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
-use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Form\FormBuilderInterface;
 use Drupal\Core\Form\FormInterface;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Link;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
-use Drupal\Core\Url;
 use Fhaculty\Graph\Graph;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -116,10 +113,6 @@ class FieldGraph implements ContainerInjectionInterface, FormInterface {
       return $build;
     }
 
-    $graph_nodes = [];
-    $graph_nodes_ids_by_entity_bundle = [];
-    $index = 0;
-
     $reference_types_filter = $this->requestStack->getCurrentRequest()->query->get('reference_types');
     $reference_field_definitions = \Drupal::service('field_tools.references.info')->getReferenceFields(
       !empty($reference_types_filter['files']),