Issue #3339095: hook_help function missing in .module file

date_filter.module

@@ -8,6 +8,21 @@
 declare(strict_types=1);
 
 use Drupal\date_filter\Plugin\views\filter\Date;
+use Drupal\Core\Routing\RouteMatchInterface;
+
+ /**
+ * Implements hook_help().
+ */
+function date_filter_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    // Main module help for the date_filter module.
+    case 'help.page.date_filter':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('This is a plug-and-play module that replaces core date and datetime filters with a single class that handles both storage types of date and timestamp.') . '</p>';
+      return $output;
+  }
+}
 
 /**
  * Implements hook_views_plugins_filter_alter().