Add some missing return types to internal/final classes

Author: nicolas-grekas

CacheWarmer/RouterCacheWarmer.php

@@ -36,10 +36,8 @@ public function __construct(ContainerInterface $container)
 
     /**
      * {@inheritdoc}
-     *
-     * @return string[]
      */
-    public function warmUp(string $cacheDir)
+    public function warmUp(string $cacheDir): array
     {
         $router = $this->container->get('router');
 
@@ -51,7 +49,7 @@ public function warmUp(string $cacheDir)
     }
 
     /**
-     * Checks whether this warmer is optional or not.
+     * {@inheritdoc}
      */
     public function isOptional(): bool
     {

Routing/DelegatingLoader.php

@@ -14,6 +14,7 @@
 use Symfony\Component\Config\Exception\LoaderLoadException;
 use Symfony\Component\Config\Loader\DelegatingLoader as BaseDelegatingLoader;
 use Symfony\Component\Config\Loader\LoaderResolverInterface;
+use Symfony\Component\Routing\RouteCollection;
 
 /**
  * DelegatingLoader delegates route loading to other loaders using a loader resolver.
@@ -42,7 +43,7 @@ public function __construct(LoaderResolverInterface $resolver, array $defaultOpt
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load($resource, string $type = null): RouteCollection
     {
         if ($this->loading) {
             // This can happen if a fatal error occurs in parent::load().