Use the assets manager.

module/config/services.php

@@ -56,8 +56,8 @@ $container[LeafletServices::MAP_PROVIDER] = $container->share(function ($contain
 /*
  * Contao assets handler. Loads Leaflet assets as contao (static) assets.
  */
-$container[LeafletServices::MAP_ASSETS] = $container->share(function () {
+$container[LeafletServices::MAP_ASSETS] = $container->share(function ($container) {
-    return new ContaoAssets();
+    return new ContaoAssets($container[Services::ASSETS_MANAGER]);
 });
 
 /*

src/Netzmacht/Contao/Leaflet/ContaoAssets.php

@@ -11,6 +11,7 @@
 
 namespace Netzmacht\Contao\Leaflet;
 
+use Netzmacht\Contao\Toolkit\View\Assets\AssetsManager;
 use Netzmacht\LeafletPHP\Assets;
 
 /**
@@ -27,6 +28,23 @@ class ContaoAssets implements Assets
      */
     private $map;
 
+    /**
+     * Assets manager.
+     *
+     * @var AssetsManager
+     */
+    private $assetsManager;
+
+    /**
+     * ContaoAssets constructor.
+     *
+     * @param AssetsManager $assetsManager Contao assets manager.
+     */
+    public function __construct(AssetsManager $assetsManager)
+    {
+        $this->assetsManager = $assetsManager;
+    }
+
     /**
      * {@inheritdoc}
      *
@@ -40,14 +58,8 @@ class ContaoAssets implements Assets
                 break;
 
             case static::TYPE_FILE:
-                if (!\Config::get('debugMode') && TL_MODE === 'FE') {
-                    $script .= '|static';
-                }
-
-                // no break
-
             default:
-                $GLOBALS['TL_JAVASCRIPT'][] = $script;
+                $this->assetsManager->addJavascript($script);
         }
     }
 
@@ -64,13 +76,8 @@ class ContaoAssets implements Assets
                 break;
 
             case static::TYPE_FILE:
-                if (!\Config::get('debugMode')) {
-                    $stylesheet .= '|all|static';
-                }
-                // no break
-
             default:
-                $GLOBALS['TL_CSS'][] = $stylesheet;
+                $this->assetsManager->addStylesheet($stylesheet);
         }
     }