Software⏱️ 2 min read📅 2026-06-04

How to Fix: Service mocked with Jest causes "The module factory of jest.mock() is not allowed to reference any out-of-scope variables" error

Learn how to fix: Service mocked with Jest causes "The module factory of jest.mock() is not allowed to reference any out-of-scope variables" error.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

This guide provides step-by-step troubleshooting for the 'The module factory of jest.mock() is not allowed to reference any out-of-scope variables' error when mocking a service with Jest.

Follow these steps to resolve the issue and successfully mock your service.

⚠️ Common Causes

  • Incorrectly imported or referenced variables in the mock function
  • Outdated or incorrect configuration of jest.mock()
  • Missing required dependencies or imports

🚀 How to Resolve This Issue

Understanding the Error

  1. Step 1: Identify the specific line of code causing the error and locate the corresponding section in this guide.
  2. Step 2: Review your import statements to ensure all necessary modules are imported.
  3. Step 3: Check for any outdated or incorrect configurations in jest.mock() and update as needed.

Fixing Incorrect Import Statements

  1. Step 1: Verify that all imports are correct and up-to-date, including the import of the service being mocked.
  2. Step 2: Ensure that no variables are referenced outside of their scope in the mock function.
  3. Step 3: Use a linter or code formatter to identify any potential issues with your code.

💡 Conclusion

By following these steps, you should be able to resolve the 'The module factory of jest.mock() is not allowed to reference any out-of-scope variables' error and successfully mock your service with Jest.

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