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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Analyzer/PSR4.php b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Analyzer/PSR4.php
new file mode 100644
index 000000000..d18a9293b
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Analyzer/PSR4.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Drupal\drupalmoduleupgrader\Plugin\DMU\Analyzer;
+
+use Drupal\drupalmoduleupgrader\AnalyzerBase;
+use Drupal\drupalmoduleupgrader\TargetInterface;
+
+/**
+ * @Analyzer(
+ *  id = "PSR4",
+ *  description = @Translation("Checks if the module defines any classes that need to be moved into a PSR-4 structure."),
+ *  documentation = {
+ *    {
+ *      "url" = "https://www.drupal.org/node/2246699",
+ *      "title" = @Translation("PSR-4 compatible class loader in Drupal core")
+ *    }
+ *  },
+ *  tags = {
+ *    "category" = { "misc", "system" }
+ *  },
+ *  message = @Translation("Classes must be PSR-4 compliant.")
+ * )
+ */
+class PSR4 extends AnalyzerBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function analyze(TargetInterface $target) {
+    $issues = [];
+    $class_count = $target
+      ->getIndexer('class')
+      ->getQuery()
+      ->condition('type', 'Pharborist\Objects\ClassNode')
+      ->countQuery()
+      ->execute()
+      ->fetchField();
+
+    if ($class_count > 0) {
+      $issues[] = $this->buildIssue($target);
+    }
+
+    return $issues;
+  }
+
+}