More precisely initializing services/config for asset mapper

Author: weaverryan

src/DependencyInjection/SwupExtension.php

@@ -27,7 +27,7 @@ public function load(array $configs, ContainerBuilder $container)
 
     public function prepend(ContainerBuilder $container)
     {
-        if (!interface_exists(AssetMapperInterface::class)) {
+        if (!$this->isAssetMapperAvailable($container)) {
             return;
         }
 
@@ -39,4 +39,19 @@ public function prepend(ContainerBuilder $container)
             ],
         ]);
     }
+
+    private function isAssetMapperAvailable(ContainerBuilder $container): bool
+    {
+        if (!interface_exists(AssetMapperInterface::class)) {
+            return false;
+        }
+
+        // check that FrameworkBundle 6.3 or higher is installed
+        $bundlesMetadata = $container->getParameter('kernel.bundles_metadata');
+        if (!isset($bundlesMetadata['FrameworkBundle'])) {
+            return false;
+        }
+
+        return is_file($bundlesMetadata['FrameworkBundle']['path'].'/Resources/config/asset_mapper.php');
+    }
 }