[IE11+Webpack5] Automatic publicpath is not supported in this browser

[gdorsi]

What version of Next.js are you using?

10.2.3

What version of Node.js are you using?

14.15.1

What browser are you using?

Internet Explorer 11

What operating system are you using?

Windows

How are you deploying your application?

Other platform

Describe the Bug

After upgrading to Webpack 5 I get the error:

"Automatic publicpath is not supported in this browser"

I have a custom webpack configuration and that might be the cause, but the same issue could be reproduced by loading the next.js website (eg. here).

When creating a fresh project the error is not thrown.

Expected Behavior

The error "Automatic publicPath is not supported in this browser" should not be thrown.

To Reproduce

Load the getting started page of the Next.js docs with IE11 and you should get the error.

[balazsorban44]

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