Unable to resolve react as an external dependency in custom package

[carwynstephen]

Bug report

Describe the bug

I have created a package for components that will be shared in multiple NextJS projects. The package transpiles to the UMD module system and specifies react and react-dom as external dependencies to be supplied by NextJS.

When server rendering, I get the error Module not found: Can't resolve 'react' in '/repos/example-broken-app/dist'

To Reproduce

• Clone https://github.com/carwynstephen/example-broken-app into a directory
• Build the example broken app using npm run build
• Clone https://github.com/carwynstephen/next-bug-example into the same directory the package is in and install dependencies and run npm run dev

Expected behavior

The component from the example broken app should be displayed on the Next app's index.

System information

• OS: macOS High Sierra 10.13.6
• Chrome 76
• NextJS 9.0.5

[balazsorban44]

This issue has been automatically locked due to no recent activity. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.