ensure AsTwigComponent::forClass() returns or throws

Author: kbond

src/TwigComponent/src/Attribute/AsTwigComponent.php

@@ -40,13 +40,15 @@ final public function getTemplate(): string
 
     /**
      * @internal
+     *
+     * @return static
      */
-    final public static function forClass(string $class): ?self
+    final public static function forClass(string $class): self
     {
         $class = new \ReflectionClass($class);
 
-        if (!$attribute = $class->getAttributes(self::class, \ReflectionAttribute::IS_INSTANCEOF)[0] ?? null) {
-            return null;
+        if (!$attribute = $class->getAttributes(static::class, \ReflectionAttribute::IS_INSTANCEOF)[0] ?? null) {
+            throw new \InvalidArgumentException(sprintf('"%s" is not a Twig Component, did you forget to add the "%s" attribute?', $class, static::class));
         }
 
         return $attribute->newInstance();

src/TwigComponent/src/ComponentRenderer.php

@@ -31,9 +31,7 @@ public function __construct(Environment $twig)
     public function render(object $component): string
     {
         // TODO: Self-Rendering components?
-        if (!$attribute = AsTwigComponent::forClass($component::class)) {
-            throw new \InvalidArgumentException(sprintf('"%s" is not a Twig Component, did you forget to add the AsTwigComponent attribute?', $component::class));
-        }
+        $attribute = AsTwigComponent::forClass($component::class);
 
         return $this->twig->render($attribute->getTemplate(), ['this' => $component]);
     }