How to Fix https is Undefined in Jest with ts-jest (TypeScript)

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How to Fix https is Undefined in Jest with ts-jest (TypeScript)

The Problem

In your Jest test file, you might have written the following code to import the https module:

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However, when you run your tests, you find that https logs as undefined, which disrupts your testing flow.

Identifying the Cause

Key Configuration Settings

ES Module Interoperability: Set esModuleInterop to true to allow for default imports from modules that use CommonJS.

[[See Video to Reveal this Text or Code Snippet]]

Steps to Resolve https Undefined Issue

Locate the compilerOptions section.

Add or modify the following keys:

"module": "CommonJS"

"esModuleInterop": true

Save the file and re-run your Jest tests.

Testing Your Fix

After making the necessary changes to your TypeScript configuration, it’s time to test if the issue has been resolved:

Run your Jest tests again using the command:

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Check the console output to see if the https module is now defined:

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If everything is configured correctly, you should see the https module displayed in the console, indicating that it is now properly imported.

Conclusion

Make sure to keep these configurations in mind for smoother development and testing experiences in the future!