Revert "fix(utils/astFromSchema): support GraphQLSchema instances without operation types defined" (#7683)

* Revert "fix(utils/astFromSchema): support `GraphQLSchema` instances without o…"

This reverts commit dddc5f6.

* Changeset

Author: ardatan

.changeset/tricky-yaks-unite.md

@@ -0,0 +1,6 @@
+---
+'@graphql-tools/utils': patch
+---
+
+Revert https://github.com/ardatan/graphql-tools/pull/7683 which can cause unexpected breaking
+changes so as before the schema extension node will always be converted to a schema definition node

packages/utils/src/print-schema-with-directives.ts

@@ -179,7 +179,7 @@ export function astFromSchema(
   }
 
   const schemaNode: SchemaDefinitionNode | SchemaExtensionNode = {
-    kind: operationTypes.length ? Kind.SCHEMA_DEFINITION : Kind.SCHEMA_EXTENSION,
+    kind: operationTypes != null ? Kind.SCHEMA_DEFINITION : Kind.SCHEMA_EXTENSION,
     operationTypes,
     // ConstXNode has been introduced in v16 but it is not compatible with XNode so we do `as any` for backwards compatibility
     directives: directives as any,

packages/utils/tests/print-schema-with-directives.spec.ts

@@ -13,7 +13,6 @@ import {
   GraphQLString,
   printSchema,
   specifiedDirectives,
-  stripIgnoredCharacters,
 } from 'graphql';
 import { GraphQLJSON } from 'graphql-scalars';
 import { makeExecutableSchema } from '@graphql-tools/schema';
@@ -403,17 +402,4 @@ describe('printSchemaWithDirectives', () => {
       expect(output).toContain('input OneOfInput @oneOf');
     }
   });
-  it('prints a federation-style subgraph schema correctly', () => {
-    const sdl = stripIgnoredCharacters(/* GraphQL */ `
-      extend schema @link(url: "https://specs.apollo.dev/federation/v2.0", import: ["@key"])
-
-      type User @key(fields: "id") {
-        id: ID!
-        username: String
-      }
-    `);
-    const userSubgraph = buildSchema(sdl, { assumeValid: true, assumeValidSDL: true });
-    const printedSchema = stripIgnoredCharacters(printSchemaWithDirectives(userSubgraph));
-    expect(printedSchema).toBe(sdl);
-  });
 });