jest tests are failing when running within a Yarn workspace

Is this a bug report?

Yes

Did you try recovering your dependencies?

Yes.

Which terms did you search for in User Guide?

yarn workspaces, jest fails, yarn jest, jest env, dispose is not a function, jest typeError environment, etc.

Environment

1. node -v: 894
2. npm -v: 5.6.0
3. yarn --version (if you use Yarn): 1.3.2
4. npm ls react-scripts (if you haven’t ejected):

# react-scripts
sauron@0.4.0 /Users/agroza/Projects/bbp/sauron
└── (empty)

# react-scripts-ts
sauron@0.4.0 /Users/agroza/Projects/bbp/sauron
└── react-scripts-ts@2.13.0  extraneous

Then, specify:

1. Operating system: Mac OS X Sierra 10.12
2. Browser and version (if relevant):

Steps to Reproduce

1. Clone cra-workspaces
2. Run yarn install at root
3. Navigate to apps/cra and run yarn test
4. Navigate to packages/package-a/packages/package-b and run yarn run test:cov

Expected Behavior

Tests should run without errors.

Actual Behavior

Some tests are throwing:

 FAIL  src/foo.spec.ts
  ● Test suite failed to run

    TypeError: environment.setup is not a function

      at ../../node_modules/jest-runner/build/run_test.js:112:23

Reproducible Demo

See cra-workspaces repo for an example of setup that has this issue.

[huchenme]

Just to update that after hours of trying, I am able to find a way to resolve this issue:

Add this piece of code into your root package.json

"resolutions": {
  "jest": "^22.4.3",
  "babel-jest": "^22.4.3", // if you are using babel-jest as well
  "babel-core": "^7.0.0-bridge.0" // if you are using babel 7
},

[rolandjitsu]

Ok, after trying out a few more things, it seems like having jest as a dep. in another workspace causes the issue.

It could be some incompatibilities between versions of jest, but I’m actually also fixed at the same version that react-scripts is (22.1.4).