Fix false-positive validation error for unknown type

Related GraphQL-js commit: graphql/graphql-js@812e09d

Author: syrusakbary

graphql/core/validation/rules/known_type_names.py

@@ -4,6 +4,18 @@
 
 class KnownTypeNames(ValidationRule):
 
+    def enter_ObjectTypeDefinition(self, node, *args):
+        return False
+
+    def enter_InterfaceTypeDefinition(self, node, *args):
+        return False
+
+    def enter_UnionTypeDefinition(self, node, *args):
+        return False
+
+    def enter_InputObjectTypeDefinition(self, node, *args):
+        return False
+
     def enter_NamedType(self, node, *args):
         type_name = node.name.value
         type = self.context.get_schema().get_type(type_name)

tests/core_validation/test_known_type_names.py

@@ -39,3 +39,25 @@ def test_unknown_type_names_are_invalid():
         unknown_type('Badger', 5, 25),
         unknown_type('Peettt', 8, 29),
     ])
+
+
+def test_ignores_type_definitions():
+    expect_fails_rule(KnownTypeNames, '''
+      type NotInTheSchema {
+        field: FooBar
+      }
+      interface FooBar {
+        field: NotInTheSchema
+      }
+      union U = A | B
+      input Blob {
+        field: UnknownType
+      }
+      query Foo($var: NotInTheSchema) {
+        user(id: $var) {
+          id
+        }
+      }
+    ''', [
+        unknown_type('NotInTheSchema', 12, 23),
+    ])