TypeError: environment.setup is not a function in React Testing

Question

I was trying to implement the example shown in Jest website: Getting started with Jest.

While running npm test on I was getting the following error:

<

Answer 1

This is an older issue but I was facing the same problem. We have react-scripts package and it uses Jest version 20.x.x which has problems with coverageTreshold. I couldn't use newer react-scripts version and the only thing helped was to use yarn resolutions, read more here https://yarnpkg.com/lang/en/docs/selective-version-resolutions/.