Catch error with entrypointlookups in sub-request by Twig exceptions

Twig_Error_Runtime leads to sub-requests.
In EntrypointLookup, the list of previously returned entries is not reset
on these requests.

Fixes symfony/demo#910

Author: ckrack

src/EventListener/ExceptionListener.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of the Symfony WebpackEncoreBundle package.
+ * (c) Fabien Potencier <[email protected]>
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\WebpackEncoreBundle\EventListener;
+
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\WebpackEncoreBundle\Asset\EntrypointLookup;
+use Twig_Error_Runtime;
+
+class ExceptionListener
+{
+    private $entrypointLookup;
+
+    public function __construct(EntrypointLookup $entrypointLookup)
+    {
+        $this->entrypointLookup = $entrypointLookup;
+    }
+
+    public function onKernelException(GetResponseForExceptionEvent $event)
+    {
+        $exception = $event->getException();
+
+        // Reset the entrypointLookup list of previously returned entries, as Twig_Error_Runtime will initialise a sub-request
+        if ($exception instanceof Twig_Error_Runtime) {
+            $this->entrypointLookup->reset();
+        }
+    }
+}

src/Resources/config/services.xml

@@ -11,6 +11,11 @@
             <argument /> <!-- entrypoints.json path -->
         </service>
 
+        <service id="webpack_encore.exceptionlistener" class="Symfony\WebpackEncoreBundle\EventListener\ExceptionListener">
+            <argument type="service" id="webpack_encore.entrypoint_lookup" />
+            <tag name="kernel.event_listener" event="kernel.request" />
+        </service>
+
         <service id="webpack_encore.tag_renderer" class="Symfony\WebpackEncoreBundle\Asset\TagRenderer">
             <argument type="service" id="webpack_encore.entrypoint_lookup" />
             <argument type="service" id="assets.packages" />