Troubleshooting 'Class extends value undefined' Error in Node.js

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Understanding the Error

Common Causes

Import Order Issues:
Ensure that you're importing classes and modules in the correct order. If a class is imported after being referenced in another file, it might be undefined at the time of reference.

Circular Dependencies:
Circular dependencies can lead to classes being undefined during the import process. Review your code structure to identify and eliminate circular dependencies.

Missing or Incorrect Module Exports:
Double-check that the module you're trying to extend is exporting the correct class or constructor. Verify the spelling and case of the exported class.

ES6 Import Syntax:
If you're using ES6 import syntax (import and export), ensure that your modules are correctly exported and imported. Mismatched syntax can lead to undefined values.

Solutions

Check Import Order:
Review your import statements and make sure that classes are imported before they are used in other files. Adjust the order of imports if necessary.

Resolve Circular Dependencies:
Restructure your code to eliminate circular dependencies. Consider breaking up large modules or using dependency injection to mitigate circular reference issues.

Verify Module Exports:
Confirm that the module you're extending exports the correct class or constructor. Address any discrepancies in naming or case.

Consistent Use of ES6 Import Syntax:

Conclusion

Remember to thoroughly test your application after making changes to ensure that the error is successfully resolved.