Fails without an error message

[crshmk]

• react-testing-library version: 6.0.0
• react version: 16.8.3
• node version: 10.13.0
• npm (or yarn) version: 6.4.1

If package.json contains
"^react": "<rootDir>/node_modules/react"
here:

  "jest": {
    "moduleNameMapper": {
      "^react": "<rootDir>/node_modules/react",
    }

then imports from react-testing-library as

import { render } from 'react-testing-library'

will be undefined. No error message will clue the problem. Debugging this problem takes a long time.

I don't know why this line of config was in this project and it doesn't seem needed now, yet some sort of error message would have saved hours of debugging. I imagine this or some other conflicting config was the issue here.

[kentcdodds]

Interesting. I'm afraid there's literally nothing we can do about that in this project because the bad config prevents our code from running at all. Sorry.