[Config] Deprecate config builder generators

Author: nicolas-grekas

CHANGELOG.md

@@ -18,6 +18,7 @@ CHANGELOG
  * Add support for union types with `Symfony\Component\EventDispatcher\Attribute\AsEventListener`
  * Add `framework.allowed_http_method_override` option
  * Initialize `router.request_context`'s `_locale` parameter to `%kernel.default_locale%`
+ * Deprecate `ConfigBuilderCacheWarmer`, return PHP arrays from your config instead
 
 7.3
 ---

CacheWarmer/ConfigBuilderCacheWarmer.php

@@ -30,7 +30,7 @@
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  *
- * @final since Symfony 7.1
+ * @deprecated since Symfony 7.4
  */
 class ConfigBuilderCacheWarmer implements CacheWarmerInterface
 {

DependencyInjection/FrameworkExtension.php

@@ -47,6 +47,7 @@
 use Symfony\Component\Cache\Marshaller\MarshallerInterface;
 use Symfony\Component\Cache\ResettableInterface;
 use Symfony\Component\Clock\ClockInterface;
+use Symfony\Component\Config\Builder\ConfigBuilderGenerator;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderInterface;
@@ -297,6 +298,9 @@ public function load(array $configs, ContainerBuilder $container): void
         if (!class_exists(IsSignatureValidAttributeListener::class)) {
             $container->removeDefinition('controller.is_signature_valid_attribute_listener');
         }
+        if (!class_exists(ConfigBuilderGenerator::class)) {
+            $container->removeDefinition('config_builder.warmer');
+        }
 
         if ($this->hasConsole()) {
             $loader->load('console.php');

Tests/CacheWarmer/ConfigBuilderCacheWarmerTest.php

@@ -11,6 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\CacheWarmer;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\IgnoreDeprecations;
 use Symfony\Bundle\FrameworkBundle\CacheWarmer\ConfigBuilderCacheWarmer;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
@@ -31,7 +33,9 @@
 use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\HttpKernel\KernelInterface;
 
-class ConfigBuilderCacheWarmerTest extends TestCase
+#[IgnoreDeprecations]
+#[Group('legacy')]
+final class ConfigBuilderCacheWarmerTest extends TestCase
 {
     private string $varDir;