[TwigComponent] Add compat with Twig 3.21 "load"/"loadTemplate"

cf https://github.com/twigphp/Twig/pull/4583/files

Author: smnandre

src/TwigComponent/src/ComponentRenderer.php

@@ -17,6 +17,7 @@
 use Symfony\UX\TwigComponent\Event\PreCreateForRenderEvent;
 use Symfony\UX\TwigComponent\Event\PreRenderEvent;
 use Twig\Environment;
+use Twig\Template;
 
 /**
  * @author Kevin Bond <[email protected]>
@@ -70,11 +71,14 @@ public function render(MountedComponent $mounted): string
         }
 
         try {
-            return $this->twig->loadTemplate(
-                $this->templateClasses[$template = $event->getTemplate()] ??= $this->twig->getTemplateClass($template),
-                $template,
-                $templateIndex,
-            )->render($variables);
+            if (method_exists(Template::class, 'load')) {
+                return $this->twig->load($event->getTemplate())->render($variables);
+            }
+
+            // Environment::loadTemplate is deprecated since Twig 3.21
+            $templateClass = $this->templateClasses[$template = $event->getTemplate()] ??= $this->twig->getTemplateClass($template, $templateIndex);
+
+            return $this->twig->loadTemplate($templateClass, $template, $templateIndex)->render($variables);
         } finally {
             $mounted = $this->componentStack->pop();
 

src/TwigComponent/src/Twig/ComponentNode.php

@@ -19,6 +19,7 @@
 use Twig\Node\Expression\AbstractExpression;
 use Twig\Node\Node;
 use Twig\Node\NodeOutputInterface;
+use Twig\Template;
 
 /**
  * @author Fabien Potencier <[email protected]>
@@ -48,7 +49,7 @@ public function compile(Compiler $compiler): void
     {
         $compiler->addDebugInfo($this);
 
-        $useYield = method_exists(Environment::class, 'useYield') && $compiler->getEnvironment()->useYield();
+        $useYield = $compiler->getEnvironment()->useYield();
 
         // since twig/twig 3.9.0: Using the internal "twig_to_array" function is deprecated.
         if (method_exists(CoreExtension::class, 'toArray')) {
@@ -154,17 +155,29 @@ public function compile(Compiler $compiler): void
         if ($useYield) {
             $compiler->write('yield from ');
         }
-        $compiler
-            ->write('$this->loadTemplate(')
-            ->string($this->getAttribute('embedded_template'))
-            ->raw(', ')
-            ->repr($this->getTemplateName())
-            ->raw(', ')
-            ->repr($this->getTemplateLine())
-            ->raw(', ')
-            ->string($this->getAttribute('embedded_index'))
-            ->raw(')');
 
+        if (method_exists(Template::class, 'load')) {
+            $compiler
+                ->write('$this->load(')
+                ->string($this->getAttribute('embedded_template'))
+                ->raw(', ')
+                ->raw($this->getTemplateLine())
+                ->raw(', ')
+                ->string($this->getAttribute('embedded_index'))
+                ->raw(')');
+        } else {
+            // Environment::loadTemplate is deprecated since Twig 3.21
+            $compiler
+                ->write('$this->loadTemplate(')
+                ->string($this->getAttribute('embedded_template'))
+                ->raw(', ')
+                ->repr($this->getTemplateName())
+                ->raw(', ')
+                ->repr($this->getTemplateLine())
+                ->raw(', ')
+                ->string($this->getAttribute('embedded_index'))
+                ->raw(')');
+        }
         if ($useYield) {
             $compiler->raw('->unwrap()->yield(');
         } else {