Jest: Cannot find module 'React' from 'ReactNativeDefaultInjection.js'

[Richard-Cao]

I run jest in Travis CI, get this error:
ERROR

My package.json:

"dependencies": {
    "react": "~15.4.1",
    "react-native": "^0.38.0",
    ...
  },
  "jest": {
    "preset": "jest-react-native"
  },
  "devDependencies": {
    "babel-jest": "^17.0.2",
    "babel-preset-react-native": "^1.9.0",
    "jest": "^17.0.3",
    "jest-react-native": "^17.0.3",
    "react-test-renderer": "^15.4.1",
    ...
  }

But on my local PC is right.

How to solve?

[Richard-Cao]

I guess this error occured when system OS is Linux.
Because the same project OSX ci log is right.
And my local PC is mac.

[thedgbrt]

Same issue with Travis CI since upgrading to :

"react": "~15.4.1",
"react-native": "^0.38.0"

This runs fine :

"react": "~15.3.1",
"react-native": "^0.37.0"

[gaearon]

From what I can see React Native 0.38 asks you to use React 15.4.0 RC 4.
Have you tried using it instead of 15.4.1?

Also related: https://github.com/facebook/jest/issues/1840.

[cosmith]

@gaearon I have the same issue. react@~15.4.1 actually resolves to React 15.0.4-rc.4 right now so this is not the issue...

[Richard-Cao]

@gaearon When run react-native init, [email protected] will generate in package.json.

[donataswix]

@Richard-Cao look at this https://github.com/facebook/jest/issues/1840#issuecomment-263004102 You could try react-15.4.0-rc.2 as a temporary solution.

[donataswix]

Adding "^React$": "<rootDir>/node_modules/react" to moduleNameMapper of jest-react-native/jest-preset.json also helps. Maybe it was forgotten to update for jest release.

As another (slightly better) workaround, I'm adding this to package.json:

"jest": {
    ...
    "moduleNameMapper": {
      "^React$": "<rootDir>/node_modules/react"
    }
  }

[ColCh]

@donataswix there is another solution. I can say, "fix" :)
https://github.com/facebook/react/issues/8442#issuecomment-263474956

[Richard-Cao]

I see

"jest": {
    "preset": "react-native"
  }

create by react-native init, but

"jest": {
    "preset": "jest-react-native"
  }

in Jest React-Native.

What we should choose?

[ColCh]

@Richard-Cao I suppose, it depends on used react-native version

"preset": "react-native" when using RN 0.38+

[Richard-Cao]

@ColCh Thx~

[cpojer]

I'll update jest-react-native today to forward to react-native. I'm also updating Jest's documentation to hint that you won't need jest-react-native any longer as the default setup with 0.38 includes a working Jest configuration.

See #2182.