Production mode minifies routerMiddleware of 'connected-react-router' as undefined

[knightus]

Bug report

What is the current behavior?
Production mode of webpack 4.32.0 cannot minify connected-react-router middleware properly, and produces undefined

If the current behavior is a bug, please provide the steps to reproduce.

• Using webpack 4.31.0, connected-react-router v6.4.0
• Upgrade webpack from 4.31.0 to 4.32.0
• Run build (production mode)
• webpack minifies connected-react-router's middleware as undefined

This is a large proprietary project so I'm not sure how to extract this to a sample repo yet. But here's some screenshots from Chrome debugger (unminified)

What is the expected behavior?
Webpack minifies this middleware successfully as a function.

Other relevant information:
webpack version: 4.32.0
Node.js version: 11.13.0
Operating System: Windows 10
Additional tools: yarn 1.16.0

[sokra]

I can't reproduce it with the instructions above.

It would be great if you reduce your issue to a small reproducible example. Best put this example into a github repository together with instructions how to get to the problem.

[knightus]

Hi @sokra,

I've created a repo trying to describe the problem better, please check and tell me if you need more information: https://github.com/knightus/webpack-issue-9159

[sokra]

Thanks this helps

[sokra]

fixed in 4.32.2