Error in Next.js 11: Unable to loop over undefined property

Upon upgrading Next.js from version 10 to 11, I encountered an error while running npm run build:

Module parse failed: Cannot read property 'forEach' of undefined
File was processed with these loaders: * ./node_modules/next/dist/build/babel/loader/index.js
You may need an additional loader to handle the result of these loaders.
TypeError: Cannot read property 'forEach' of undefined>

Build error occurredError: > Build failed because of webpack errors

It appears that the issue is related to using the spread operator, as removing all instances of it allows the build to succeed.

I came across some similar problems, although they were not specifically related to Next.js 11:

javascriptwebpacknext.jsbabeljsbabel-loader

Answer №1

Sharing the solution to my own query here in hopes of aiding others and preventing hours of troubleshooting:

To resolve the issue, I updated Next.js from 11.0.1 to 11.1.0.

Despite resolving the issue, the root cause remains unknown, and no related fixes were found in the changelog. Any insights or suggestions would be greatly appreciated.

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