How to Resolve SyntaxError: Unexpected token 'export' in Jest with Next.js Monorepo

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The Root of the Issue

Steps to Resolve the Error

Update Jest Configuration

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Key Points:

transform: Use babel-jest to handle transforming ES modules.

transformIgnorePatterns: Ensure that specific ES module dependencies are processed.

Install Necessary Dependencies

Ensure that babel-jest and other required Babel packages are installed:

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Configure Babel

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Update TypeScript Configuration

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Testing and Debugging

Once the configurations are in place, run your tests:

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If the error persists, review the stack trace to see if other configurations in your monorepo might be interfering. Common culprits include misconfigured paths or additional transformations needed for other parts of your setup.

Conclusion