Multiple content type selection working

archive_tree.install

@@ -0,0 +1,18 @@
+<?php
+/**
+ * @file
+ * Install, update and uninstall hooks for the Archive Tree module.
+ */
+
+/**
+ * Implements hook_uninstall().
+ */
+function archive_tree_uninstall() {
+  // Remove the views provided by this module on uninstall.
+  $view_ids = ['archive_by_year', 'archive_by_month'];
+  foreach ($view_ids as $view_id) {
+    if ($view = \Drupal::entityTypeManager()->getStorage('view')->load($view_id)) {
+      $view->delete();
+    }
+  }
+}