fix: complete ReflectionEnum polyfill

Since the polyfill is autoloaded, PHPStan seems to discover the class, even with the early return:
Call to an undefined method ReflectionEnum::getCases()
Completing this polyfill solves the issue.

Signed-off-by: Alan Poulain <contact@alanpoulain.eu>

polyfill/ReflectionEnumPolyfill.php

@@ -5,10 +5,27 @@
 }
 
 /** @internal */
-class ReflectionEnum
+class ReflectionEnum extends \ReflectionClass
 {
-    public function __construct($enum)
+    public function __construct($objectOrClass) {}
+
+    public function hasCase(string $name): bool
+    {
+    }
+
+    public function getCases(): array
+    {
+    }
+
+    public function getCase(string $name): ReflectionEnumUnitCase
+    {
+    }
+
+    public function isBacked(): bool
     {
     }
-}
 
+    public function getBackingType(): ?ReflectionType
+    {
+    }
+}

src/Generator/EnumGenerator/Cases/CaseFactory.php

@@ -10,6 +10,7 @@
 use function array_key_exists;
 use function array_map;
 use function assert;
+use function method_exists;
 
 use const PHP_VERSION_ID;
 
@@ -65,6 +66,12 @@ public static function fromReflectionCases(ReflectionEnum $enum)
             $backedCases[$singleCase->getName()] = $singleCase->getBackingValue();
         }
 
-        return BackedCases::fromCasesWithType($backedCases, $backingType->getName());
+        // PHP 8.2
+        if (method_exists($backingType, 'getName')) {
+            $backingTypeName = $backingType->getName();
+        } else {
+            $backingTypeName = (string) $backingType;
+        }
+        return BackedCases::fromCasesWithType($backedCases, $backingTypeName);
     }
 }