fix: check data is present before reading errors

Author: ricellis

lib/request-wrapper.ts

@@ -648,18 +648,20 @@ function hasStringProperty(obj: any, property: string): boolean {
 function parseServiceErrorMessage(response: any): string | undefined {
   let message;
 
-  if (
-    Array.isArray(response.errors) &&
-    response.errors.length > 0 &&
-    hasStringProperty(response.errors[0], 'message')
-  ) {
-    message = response.errors[0].message;
-  } else if (hasStringProperty(response, 'error')) {
-    message = response.error;
-  } else if (hasStringProperty(response, 'message')) {
-    message = response.message;
-  } else if (hasStringProperty(response, 'errorMessage')) {
-    message = response.errorMessage;
+  if (response) {
+    if (
+      Array.isArray(response.errors) &&
+      response.errors.length > 0 &&
+      hasStringProperty(response.errors[0], 'message')
+    ) {
+      message = response.errors[0].message;
+    } else if (hasStringProperty(response, 'error')) {
+      message = response.error;
+    } else if (hasStringProperty(response, 'message')) {
+      message = response.message;
+    } else if (hasStringProperty(response, 'errorMessage')) {
+      message = response.errorMessage;
+    }
   }
 
   logger.info(`Parsing service error message: ${message}`);

test/unit/request-wrapper.test.js

@@ -1,5 +1,5 @@
 /**
- * (C) Copyright IBM Corp. 2019, 2021.
+ * (C) Copyright IBM Corp. 2019, 2025.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -1015,6 +1015,20 @@ describe('formatError', () => {
       'Malformed JSON string: { "errorMessage": "some error"'
     );
   });
+
+  it('should not throw TypeError reading properties for a response with no data', () => {
+    expect(() =>
+      requestWrapperInstance.formatError({
+        request: 'fake-http-request-object',
+        response: {
+          statusText: 'OK',
+          status: 200,
+        },
+        message: 'timed out',
+        code: 'ETIMEDOUT',
+      })
+    ).not.toThrow();
+  });
 });
 
 describe('getHttpClient', () => {