From 62b003643779246403c0fd71d7e7486d94c50835 Mon Sep 17 00:00:00 2001
From: Torsten Blindert <info@by-torsten.com>
Date: Wed, 5 Dec 2018 18:55:14 +0100
Subject: [PATCH 1/3] BUGFIX: expect ->getType() to throw

---
 src/Utils/SchemaExtender.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Utils/SchemaExtender.php b/src/Utils/SchemaExtender.php
index fab006e..110e750 100644
--- a/src/Utils/SchemaExtender.php
+++ b/src/Utils/SchemaExtender.php
@@ -513,7 +513,14 @@ class SchemaExtender
                 $schemaExtensions[] = $def;
             } elseif ($def instanceof TypeDefinitionNode) {
                 $typeName = isset($def->name) ? $def->name->value : null;
-                if ($schema->getType($typeName)) {
+
+                try {
+                    $type = $schema->getType($typeName);
+                } catch (Error $error) {
+                    $type = null;
+                }
+
+                if ($type) {
                     throw new Error('Type "' . $typeName . '" already exists in the schema. It cannot also be defined in this type definition.', [$def]);
                 }
                 $typeDefinitionMap[$typeName] = $def;

From d5fddfd504d438d92a32be28546a615cc49f3c6f Mon Sep 17 00:00:00 2001
From: Torsten Blindert <info@by-torsten.com>
Date: Wed, 5 Dec 2018 19:13:32 +0100
Subject: [PATCH 2/3] TASK: Added test

---
 tests/Utils/SchemaExtenderTest.php | 45 ++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/tests/Utils/SchemaExtenderTest.php b/tests/Utils/SchemaExtenderTest.php
index 8965fa7..be07d1c 100644
--- a/tests/Utils/SchemaExtenderTest.php
+++ b/tests/Utils/SchemaExtenderTest.php
@@ -24,6 +24,7 @@ use GraphQL\Type\Definition\ScalarType;
 use GraphQL\Type\Definition\Type;
 use GraphQL\Type\Definition\UnionType;
 use GraphQL\Type\Schema;
+use GraphQL\Utils\BuildSchema;
 use GraphQL\Utils\SchemaExtender;
 use GraphQL\Utils\SchemaPrinter;
 use PHPUnit\Framework\TestCase;
@@ -1962,4 +1963,48 @@ extend type Query {
         $result = GraphQL::executeQuery($extendedSchema, $query);
         self::assertSame(['data' => ['hello' => 'Hello World!']], $result->toArray());
     }
+
+
+    /**
+     * @see https://github.com/webonyx/graphql-php/issues/180
+     */
+    public function testShouldBeAbleToIntroduceNewTypesThroughExtension()
+    {
+        $sdl = '
+          type Query {
+            defaultValue: String
+          }
+          type Foo {
+            value: Int
+          }
+        ';
+
+        $documentNode = Parser::parse($sdl);
+        $schema = BuildSchema::build($documentNode);
+
+        $extensionSdl = '
+          type Bar {
+            foo: Foo
+          }
+        ';
+
+        $extendedDocumentNode = Parser::parse($extensionSdl);
+        $extendedSchema = SchemaExtender::extend($schema, $extendedDocumentNode);
+
+        $expected = '
+            type Bar {
+              foo: Foo
+            }
+            
+            type Foo {
+              value: Int
+            }
+            
+            type Query {
+              defaultValue: String
+            }
+        ';
+
+        static::assertEquals($this->dedent($expected), SchemaPrinter::doPrint($extendedSchema));
+    }
 }

From 9609d2ac84623291c76c4c72b61235799ad07f5e Mon Sep 17 00:00:00 2001
From: Torsten Blindert <info@by-torsten.com>
Date: Wed, 5 Dec 2018 19:23:07 +0100
Subject: [PATCH 3/3] TASK: Code style

---
 tests/Utils/SchemaExtenderTest.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/Utils/SchemaExtenderTest.php b/tests/Utils/SchemaExtenderTest.php
index be07d1c..bc9842d 100644
--- a/tests/Utils/SchemaExtenderTest.php
+++ b/tests/Utils/SchemaExtenderTest.php
@@ -1980,7 +1980,7 @@ extend type Query {
         ';
 
         $documentNode = Parser::parse($sdl);
-        $schema = BuildSchema::build($documentNode);
+        $schema       = BuildSchema::build($documentNode);
 
         $extensionSdl = '
           type Bar {
@@ -1989,7 +1989,7 @@ extend type Query {
         ';
 
         $extendedDocumentNode = Parser::parse($extensionSdl);
-        $extendedSchema = SchemaExtender::extend($schema, $extendedDocumentNode);
+        $extendedSchema       = SchemaExtender::extend($schema, $extendedDocumentNode);
 
         $expected = '
             type Bar {