Avoid extensions override

package.json

@@ -1,6 +1,6 @@
 {
   "name": "graphql",
-  "version": "15.7.1",
+  "version": "15.7.2",
   "description": "A Query Language and Runtime which can target any service.",
   "license": "MIT",
   "private": true,

src/error/GraphQLError.js

@@ -105,7 +105,10 @@ export class GraphQLError extends Error {
     this.extensions = extensions ?? {};
 
     const originalExtensions = originalError?.extensions;
-    if (isObjectLike(originalExtensions)) {
+    if (
+      Object.keys(this.extensions).length === 0 &&
+      isObjectLike(originalExtensions)
+    ) {
       this.extensions = { ...originalExtensions };
     }
 

src/error/__tests__/GraphQLError-test.js

@@ -233,3 +233,46 @@ describe('printError', () => {
     `);
   });
 });
+
+describe('Graphql error extensions', () => {
+  it('includes passed extension fields', () => {
+    const original = new GraphQLError('msgA', null, null, null, null, null, {
+      foo: 'bar',
+    });
+    const { message, extensions } = new GraphQLError(
+      'msgB',
+      null,
+      null,
+      null,
+      null,
+      original,
+      {
+        baz: 'qux',
+      },
+    );
+
+    expect({ message, extensions }).to.deep.equal({
+      message: 'msgB',
+      extensions: { baz: 'qux' },
+    });
+  });
+
+  it('defaults to original error extension if extensions argument is not passed', () => {
+    const original = new GraphQLError('msgA', null, null, null, null, null, {
+      foo: 'bar',
+    });
+    const { message, extensions } = new GraphQLError(
+      'msgB',
+      null,
+      null,
+      null,
+      null,
+      original,
+    );
+
+    expect({ message, extensions }).to.deep.equal({
+      message: 'msgB',
+      extensions: { foo: 'bar' },
+    });
+  });
+});

src/version.js

@@ -6,14 +6,14 @@
 /**
  * A string containing the version of the GraphQL.js library
  */
-export const version = '15.7.1';
+export const version = '15.7.2';
 
 /**
  * An object containing the components of the GraphQL.js version string
  */
 export const versionInfo = Object.freeze({
   major: 15,
   minor: 7,
-  patch: 1,
+  patch: 2,
   preReleaseTag: null,
 });