fix: ensure default directives do not get replaced by custom directiv…

…es (#27)

* fix: ensure default directives do not get replaced by custom directives

* style: fix imports

src/FederatedSchema.php

@@ -6,6 +6,7 @@
 
 use GraphQL\Type\Schema;
 use GraphQL\Type\Definition\CustomScalarType;
+use GraphQL\Type\Definition\Directive;
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\UnionType;
 use GraphQL\Type\Definition\Type;
@@ -63,7 +64,7 @@ class FederatedSchema extends Schema
     public function __construct($config)
     {
         $this->entityTypes = $this->extractEntityTypes($config);
-        $this->entityDirectives = Directives::getDirectives();
+        $this->entityDirectives = array_merge(Directives::getDirectives(), Directive::getInternalDirectives());
 
         $config = array_merge($config, $this->getEntityDirectivesConfig($config), $this->getQueryTypeConfig($config));
 

test/SchemaTest.php

@@ -62,6 +62,12 @@ public function testDirectives()
         $this->assertArrayHasKey('external', $directives);
         $this->assertArrayHasKey('provides', $directives);
         $this->assertArrayHasKey('requires', $directives);
+
+        // These are the default directives, which should not be replaced
+        // https://www.apollographql.com/docs/apollo-server/schema/directives#default-directives
+        $this->assertArrayHasKey('include', $directives);
+        $this->assertArrayHasKey('skip', $directives);
+        $this->assertArrayHasKey('deprecated', $directives);
     }
 
     public function testServiceSdl()