Applies suggested changes

Author: Dustin Breuer

src/Generator/TypeBuilder.php

@@ -10,6 +10,7 @@
 use GraphQL\Type\Definition\InputObjectType;
 use GraphQL\Type\Definition\InterfaceType;
 use GraphQL\Type\Definition\ObjectType;
+use GraphQL\Type\Definition\ResolveInfo;
 use GraphQL\Type\Definition\Type;
 use GraphQL\Type\Definition\UnionType;
 use Murtukov\PHPCodeGenerator\ArrowFunction;
@@ -936,21 +937,19 @@ protected function buildResolveType($resolveType)
      *      fn($className) => (($className = "App\\ClassName") && $value instanceof $className)
      *
      * @param mixed $isTypeOf
-     *
-     * @return mixed|ArrowFunction
      */
-    private function buildIsTypeOf($isTypeOf)
+    private function buildIsTypeOf($isTypeOf): ArrowFunction
     {
         if (EL::isStringWithTrigger($isTypeOf)) {
             $expression = $this->expressionConverter->convert($isTypeOf);
 
-            return ArrowFunction::new()
-                ->addArguments('className')
-                ->setExpression(Literal::new($expression))
-                ->setStatic();
+            return ArrowFunction::new(Literal::new($expression), 'bool')
+                ->setStatic()
+                ->addArguments('value', 'context')
+                ->addArgument('info', ResolveInfo::class);
         }
 
-        return $isTypeOf;
+        return ArrowFunction::new($isTypeOf);
     }
 
     /**