introspectionFromSchema: enable 'specifiedByUrl' by default

src/utilities/__tests__/buildClientSchema-test.js

@@ -31,15 +31,10 @@ import { introspectionFromSchema } from '../introspectionFromSchema';
  * returns that schema printed as SDL.
  */
 function cycleIntrospection(sdlString: string): string {
-  const options = {
-    specifiedByUrl: true,
-    directiveIsRepeatable: true,
-  };
-
   const serverSchema = buildSchema(sdlString);
-  const initialIntrospection = introspectionFromSchema(serverSchema, options);
+  const initialIntrospection = introspectionFromSchema(serverSchema);
   const clientSchema = buildClientSchema(initialIntrospection);
-  const secondIntrospection = introspectionFromSchema(clientSchema, options);
+  const secondIntrospection = introspectionFromSchema(clientSchema);
 
   /**
    * If the client then runs the introspection query against the client-side

src/utilities/__tests__/introspectionFromSchema-test.js

@@ -18,6 +18,7 @@ function introspectionToSDL(introspection: IntrospectionQuery): string {
 
 describe('introspectionFromSchema', () => {
   const schema = new GraphQLSchema({
+    description: 'This is a simple schema',
     query: new GraphQLObjectType({
       name: 'Simple',
       description: 'This is a simple type',
@@ -34,6 +35,7 @@ describe('introspectionFromSchema', () => {
     const introspection = introspectionFromSchema(schema);
 
     expect(introspectionToSDL(introspection)).to.deep.equal(dedent`
+      """This is a simple schema"""
       schema {
         query: Simple
       }

src/utilities/introspectionFromSchema.js

@@ -26,6 +26,7 @@ export function introspectionFromSchema(
   options?: IntrospectionOptions,
 ): IntrospectionQuery {
   const optionsWithDefaults = {
+    specifiedByUrl: true,
     directiveIsRepeatable: true,
     schemaDescription: true,
     ...options,