Is this a bug report?

Yes

Can you also reproduce the problem with npm 4.x?

No for npm 4.6.1 nor 5.5.1, but yes for all after installing by yarn.

Which terms did you search for in User Guide?

'jest' and 'ts-jest'

Environment

1. node -v: v8.9.0
2. npm -v:5.5.1
3. yarn --version (if you use Yarn): 1.2.1
4. npm ls react-scripts-ts (if you haven’t ejected):
   ts-error@0.1.0 /Users/XXXX/XXXXX
   └── UNMET DEPENDENCY react-scripts-ts@2.8.0
   npm ERR! missing: react-scripts-ts@2.8.0, required by ts-error@0.1.0

macOS High Sierra

Steps to Reproduce

1. Created project with create-react-app --scripts-version=react-scripts-ts
2. Upgrade typescript with yarn add typescript@^2.6.0
3. Run tests yarn test and press [A] to fail in module resolution.

 FAIL  src/App.test.tsx
  ● Test suite failed to run

    Cannot find module 'ts-jest' from 'App.test.tsx'

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:179:17)
      at Object.<anonymous> (src/App.test.tsx:1:103)

It never happens in case of yarn add typescript@2.5.3, same as dependent one of react-scripts-ts.

Expected Behavior

Execute test codes successfully.

Actual Behavior

Fails before actual tests.

Reproducible Demo

https://github.com/karak/ts-jest-error.git