Module build failed after upgraded to v6 with "_document.js"

[wellyshen]

I'm trying to upgrade from v5 to v6. And I encountered a build error which caused from the _document.js as the following screenshot. Once I remove the _document.js the error was gone. In additional even that I used the example the error still occurs.

• I have searched the issues of this repository and believe that this is not a duplicate.

Expected Behavior

• Upgraded to v6 and build success with _document.js.

Current Behavior

• Upgraded to v6 but build failed with _document.js.

Steps to Reproduce (for bugs)

1. Upgraded to v6 via this instruction.
2. Run yarn dev and build success.
3. But build failed due to Module build failed: ReferenceError: Unknown helper getPrototypeOf which caused from _document.js.

Your Environment

Tech	Version
next	v6
node	v9.11.1
OS	MacOS
browser	Google Chrome

[timneutkens]

It's impossible to reproduce without any code samples. Please provide a full reproduction repository 👍

[srascar]

@wellyshen , you might be missing some of the babel plugins.
can you try to add ?

"plugins": [
      "@babel/plugin-transform-runtime"
    ]

Hope it will help

[zspencer]

Thanks @srascar, adding that resolved the build failure.