Switch to Vitest

[colinhacks]

Easy switch, Vitest is great.

Benchmarking

With Jest + ts-jest — 4000ms

With Vitest — 1.3s

Issues

vitest.workspace.ts...another workspace file

My only complaint is the need for a vitest.workspace.ts. It would be nice if this read from "workspaces" in package.json. I couldn't find a satisfactory discussion on this subject on the Vitest repo but maybe I missed something.

I have the same complaint with pnpm. Why do these tools all need their own workspace files? If the performance penalty from parsing a bunch of package.jsons is a factor, maybe these tools could converge on a convention like workspace.yml.

typecheck.exclude doesn't seem to work as expected

I couldn't get typechecking to include my test files and exclude the files in zod/deno/lib. The globs definitely aren't resolving in a normal way. I ended up just setting ignoreSourceErrors: true which isn't a good long term solution. There's been some confusion about Vite's approach to glob expansion in the past: vitest-dev/vitest#4767

If anyone wants to repro this, disable ignoreSourceErrors in vitest.root.ts and run pnpm test. Feel free to play around with some different include/exclude globs.