Frontend and backend tests in a monorepo

[revmischa]

what are the best practices for using vitest with a monorepo? I've tried really hard to have one vite.config file for both node and react tests and I just can't get it right.

one problem is having to specify a single environment for the whole project - node or DOM. in one set of tests I will always have to put the // @vitest-environment jsdom guys which feels not ideal.

another is threading - it causes segfaults pretty consistently with my prisma integration tests, but if i don't have it enabled for DOM tests then they seem to be not isolated and end up having a dirty DOM between tests.

the test setup has a bunch of hacky stuff i found on github issues for things like mocked canvas. would be ideal to have setup files by environment or something.