Load Drush Symfony compatibility classes

README.md

@@ -6,7 +6,8 @@ Extension for [PHPStan](https://phpstan.org/) to allow analysis of Drupal code.
 
 PHPStan is able to [discover symbols](https://phpstan.org/user-guide/discovering-symbols) by using autoloading provided 
 by Composer. However, Drupal does not provide autoloading information for modules and themes. This project registers 
-those namespaces so that PHPStan can properly discover symbols in your Drupal code base automatically.
+those namespaces so that PHPStan can properly discover symbols in your Drupal code base automatically. It also
+registers Drush's Symfony compatibility classes, such as `DrushStyle`.
 
 > [!NOTE]
 > With Drupal 11.2, Drupal core is now using PHPStan 2.0. The 1.x branch of phpstan-drupal will be supported until 

phpstan.neon

@@ -22,5 +22,6 @@ parameters:
 		-  tests/src/DeprecatedScope/data/*.php
 	dynamicConstantNames:
 		- Drupal::VERSION
+		- Symfony\Component\HttpKernel\Kernel::MAJOR_VERSION
 includes:
 	- phpstan-baseline.neon

src/Drupal/DrupalAutoloader.php

@@ -13,6 +13,7 @@
 use RuntimeException;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Finder\Finder;
+use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Yaml\Yaml;
 use Throwable;
 use function array_map;
@@ -198,6 +199,13 @@ public function register(Container $container): void
                 foreach (Finder::create()->files()->name('*.inc')->in($drushDir . '/includes') as $file) {
                     require_once $file->getPathname();
                 }
+                // Some Drush versions map classes to a Symfony-version
+                // specific directory at runtime, mirror its preflight.
+                // @see \Drush\Preflight\Preflight::loadSymfonyCompatabilityAutoloader()
+                $compatibilityDir = $drushDir . '/src-symfony-compatibility/' . (Kernel::MAJOR_VERSION < 6 ? 'v4' : 'v6');
+                if (is_dir($compatibilityDir)) {
+                    $this->autoloader->addPsr4('Drush\\', $compatibilityDir);
+                }
             }
         }
 

tests/src/DrushIntegrationTest.php

@@ -27,4 +27,15 @@ public function testPaths(): void
         ], []);
     }
 
+    public function testSymfonyCompatibilityClasses(): void
+    {
+        $reflect = new \ReflectionClass(\Drush\Drush::class);
+        $fileName = $reflect->getFileName();
+        self::assertNotFalse($fileName);
+        if (!is_dir(dirname($fileName, 2) . '/src-symfony-compatibility')) {
+            self::markTestSkipped('Drush does not ship Symfony compatibility classes.');
+        }
+        self::assertTrue($this->createReflectionProvider()->hasClass('Drush\\Symfony\\LessStrictArgvInput'));
+    }
+
 }