TypeError: Class extends value # is not a constructor or null - JavaScript - The freeCodeCamp Forum

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Hi there, can anyone help me to figure out what´s the issue with this error? I tried to upload a Node.js and Next.js app on Heroku, but it failed because I did not add "type": "module" inside the package.json After I added "type": "module" to package.json I needed to change the file extension from next.config.js (.js) to next.config.cjs (.cjs (commonJS)). Then I tried to run the app to see if everything works and I got the above error. It seems that I messed up something with the nod
TypeError: Class extends value #<Object> is not a constructor or null -  JavaScript - The freeCodeCamp Forum
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TypeError: Class extends value #<Object> is not a constructor or null -  JavaScript - The freeCodeCamp Forum
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TypeError: Class extends value #<Object> is not a constructor or null -  JavaScript - The freeCodeCamp Forum
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TypeError: Class extends value #<Object> is not a constructor or null -  JavaScript - The freeCodeCamp Forum
TypeError: Class extends value # is not a constructor or null - JavaScript - The freeCodeCamp Forum
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TypeError: Class extends value #<Object> is not a constructor or null -  JavaScript - The freeCodeCamp Forum
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