Created by: skovhus
Fixes https://github.com/facebook/create-react-app/issues/8361, fixes #8689 (closed), fixes #7491 (closed).
QA
I hope that CI will ensure that Jest 25 works.
But I'm wondering what is the best way to try link react-script into an existing application and try it out? I'll try to verify that the suggested changes will work with the CRA-powered apps that I'm currently working on.