fix(utils/mapSchema): do not map builtin scalars (#5294)

* add failing test * Fix --------- Co-authored-by: Arda TANRIKULU <ardatanrikulu@gmail.com>

Author: n1ru4l

.changeset/social-pots-grab.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/utils': patch
+---
+
+Do not map builtin scalars

packages/utils/src/mapSchema.ts

@@ -14,6 +14,7 @@ import {
  GraphQLNonNull,
  GraphQLObjectType,
  GraphQLObjectTypeConfig,
+ GraphQLScalarType,
  GraphQLSchema,
  GraphQLType,
  InputValueDefinitionNode,
@@ -28,6 +29,7 @@ import {
  isScalarType,
  isUnionType,
  Kind,
+ specifiedScalarTypes,
 } from 'graphql';
 import { getObjectTypeFromTypeMap } from './getObjectTypeFromTypeMap.js';
 import {
@@ -109,7 +111,10 @@ function mapTypes(
  if (!typeName.startsWith('__')) {
  const originalType = originalTypeMap[typeName];
 
- if (originalType == null || !testFn(originalType)) {
+ if (
+ originalType == null ||
+ (!testFn(originalType) && !specifiedScalarTypes.includes(originalType as GraphQLScalarType))
+ ) {
  newTypeMap[typeName] = originalType;
  continue;
  }

packages/utils/tests/mapSchema.test.ts

@@ -93,6 +93,23 @@ describe('mapSchema', () => {
  expect(newSchema.getQueryType()?.name).toBe('RootQuery');
  });
 
+ test('map scalar type', () => {
+ const schema = buildSchema(/* GraphQL */ `
+ type Query {
+ _: Boolean
+ }
+ `);
+
+ mapSchema(schema, {
+ [MapperKind.SCALAR_TYPE](type) {
+ const config = type.toConfig();
+ return new GraphQLScalarType({
+ ...config,
+ });
+ },
+ });
+ });
+
  const typeDefs = /* GraphQL */ `
  directive @schemaDirective(role: String) on SCHEMA
  directive @schemaExtensionDirective(role: String) on SCHEMA