Feature suggestion: npm run doctor

[gaearon]

If something’s messed up with your project setup, it would be great to have a way to repair it.
The most common problem I’ve seen in React apps is duplicate React installation.
It caused countless lost hours and people still bump into it: facebook/react#2402

We could offer npm run doctor that checks for common problems. As the first step, it would check npm ls | grep react and if there are two React installations, explain how to fix it (i.e. remove the nested one).

[mxstbr]

That's interesting. I would've thought this should be on the webpack layer?

[gaearon]

Hm. Could do it that way too. Do you want to try?

[gaearon]

https://medium.com/@xjamundx/manually-tuning-webpack-builds-284923f47f44

[gaearon]

Closing for no interest.