Jest fails with error: Cannot find module 'react/lib/ReactComponentTreeHook'

Question

I have installed Jest v17.0.3 in my react project.

When I run jest locally it works fine, but on the build server it fails with:

Error: Cannot fin

Answer 1

In the latest versions of react we often see this error as we have loaded 2 versions of react:

To make sure you have just 1 version, run the following in your terminal:

1. npm ls react-dom

2. npm ls react

Both the react and react-dom versions need to be same. If any one of these returns more than 1 version then that's not supported. You have to then correct it in your corresponding package.json