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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Constants.php b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Constants.php
new file mode 100644
index 000000000..e4b80496d
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Constants.php
@@ -0,0 +1,94 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\drupalmoduleupgrader\Plugin\DMU\Indexer\Constants.
+ */
+
+namespace Drupal\drupalmoduleupgrader\Plugin\DMU\Indexer;
+
+use Drupal\drupalmoduleupgrader\ArrayIndexer;
+use Drupal\drupalmoduleupgrader\IndexerUsageInterface;
+use Pharborist\Constants\ConstantDeclarationNode;
+use Pharborist\Constants\ConstantNode;
+use Pharborist\Filter;
+use Pharborist\Functions\DefineNode;
+use Pharborist\NodeCollection;
+use Pharborist\NodeInterface;
+use Pharborist\Parser;
+use Pharborist\Types\ScalarNode;
+use Pharborist\Types\StringNode;
+
+/**
+ * @Indexer(
+ *  id = "constant"
+ * )
+ */
+class Constants extends ArrayIndexer implements IndexerUsageInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addFile($path) {
+    Parser::parseFile($path)
+      ->find(Filter::isInstanceOf('\Pharborist\Constants\ConstantNode', '\Pharborist\Functions\DefineNode', '\Pharborist\Constants\ConstantDeclarationNode'))
+      ->each([ $this, 'add' ]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function add(NodeInterface $node) {
+    if ($node instanceof DefineNode) {
+      list ($key, $value) = $node->getArguments();
+      if ($key instanceof StringNode && $value instanceof ScalarNode) {
+        $this->elements[ $key->toValue() ] = $value->toValue();
+      }
+    }
+    elseif ($node instanceof ConstantDeclarationNode) {
+      $value = $node->getValue();
+      if ($value instanceof ScalarNode) {
+        $this->elements[ (string) $node->getName() ] = $value->toValue();
+      }
+    }
+    elseif ($node instanceof ConstantNode) {
+      $this->db
+        ->insert($this->table)
+        ->fields([
+          'id' => (string) $node->getConstantName(),
+          // Hardcoding file name, as file name resolution is unavailable due
+          // to changes upstream in Pharborist.
+          'file' => 'foo.module',
+        ])
+        ->execute();
+    }
+    else {
+      throw new \InvalidArgumentException('Unexpected node type (expected DefineNode, ConstantDeclarationNode, or ConstantNode).');
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getUsages($identifier) {
+    $files = $this->getQuery(['file'])
+      ->distinct()
+      ->condition('id', $identifier)
+      ->execute()
+      ->fetchCol();
+
+    $usages = new NodeCollection();
+    foreach ($files as $file) {
+      $this->target
+        ->open($file)
+        ->find(Filter::isInstanceOf('\Pharborist\Constants\ConstantNode'))
+        ->filter(function(ConstantNode $node) use ($identifier) {
+          return $node->getConstantName() == $identifier;
+        })
+        ->addTo($usages);
+    }
+
+    return $usages;
+  }
+
+}