I'm also having the same issue. I tried to freeze old versions of my dependencies (including next) and run tests again - same error.

I concur with Alberto's opinion - that's not the issue with codebase, but with external dependency. But I'm unable to find which one exactly. Jest and all related packages to it were released at least a few days ago, so they should not break everything just today.

Perhaps it's the issue with the Next. At first I thought it was Next's custom transformer for tests written in Typescript, which relies on SWC compiler:

next/dist/build/swc/jest-transformer.js

However, it was not updated for a few month and seems to work fine. Also I use Next 14, so it's not even latest major release. So I checked these libraries also

• JSDom, which creates a DOM abstraction for these tests was last published 2 month ago.
• @testing-library/jest-dom was last published a months ago
• @testing-library/react was published 3 months ago
• Jest itself was published 4 month ago

My guess a dependency of any of these libraries is the issue. For now I just disabled React tests to preserve CI pipelines