ERR_UNSUPPORTED_DIR_IMPORT or EISDIR with vitest

[andreialecu]

Describe the bug

It appears that when using vitest via https://analogjs.org/docs/features/testing/vitest the test suite will run into bizarre issues due to the way this library imports @apollo/client/core.

I'm not sure if it's a bug in this library or in vite/vitest. I also opened a bug report on their side:
vitejs/vite#15795

To Reproduce

Repro at: https://stackblitz.com/~/edit/vitest-dev-vitest-djnid1?initialPath=/__vitest__/

Expected behavior

No error

[andreialecu]

It appears the "correct" way is to change all the imports to @apollo/client/core/index.js as per: apollographql/apollo-client#11570 (comment)