TypeError: Jest: a transform must export a process function

[jeremyzilar]

👋 I am trying to add test-runner to an existing project that already has Storybook and Jest running, when following the Getting started instructions, I end up with the following error for each of my existing stories:

 FAIL   browser: chromium  spec/storybook/pages/request/index.stories.tsx
  ● Test suite failed to run

    TypeError: Jest: a transform must export a `process` function.

      at ScriptTransformer._getTransformer (node_modules/@jest/transform/build/ScriptTransformer.js:360:13)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:427:28)
      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:569:40)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:607:25)
      at interopRequireDefault (node_modules/@storybook/core-common/dist/cjs/utils/interpret-require.js:64:16)

Steps to reproduce

1. run yarn storybook in terminal, wait for it to finish
2. run yarn test-storybook in another terminal

Current packages

• My major versions of ts-jest and jest match.
• I am using Webpack 4

Any thoughts on this?

[jeremyzilar]

FYI, this seemed to solve it kulshekhar/ts-jest#2612 (comment)
Updating react-scripts fixed it. It was importing an older version dependency.