bunx vitest hangs

[cecilia-sanare]

What version of Bun is running?

1.0.28+705638470

What platform is your computer?

Linux 6.1.79 x86_64 unknown

What steps can reproduce the bug?

In this scenario I'm using nix-shell, but this happens in other environments as well.

# shell.nix
{ pkgs ? import <nixpkgs-unstable> { } }:

pkgs.mkShell {
  buildInputs = with pkgs; [
    # Without node it just silently hangs
    # nodejs_20
    bun
  ];
}

Minimum reproducible example

mkdir temp
touch temp/example.spec.ts
(cd temp && bunx vitest)

What is the expected behavior?

Bun should at the very least complain in some way and ideally inform me that installing NodeJS will likely resolve the problem.

What do you see instead?

Bun just hangs silently.

Additional information

I've hit this multiple times and I'm just used to assuming this is what's wrong.
However to developers that are new to bun this is an incredibly confusing scenario and most people wouldn't expect installing NodeJS to be the answer given Buns whole thing is to be a drop-in replacement even if its not 100% there yet.

[Electroid]

The root cause here is a specific issue with Vitest and Bun, would you be able to share any code so we can reproduce?

[cecilia-sanare]

Hi @Electroid! I actually included a simple method of reproducing it with a few commands in the comment above.
But here's a small github repo as well that reproduces the issue.

https://github.com/cecilia-sanare/repro-bun-9170

[Electroid]

Duplicate of #4145

[Electroid]

We will fix this, didn't see that we had an open issue for this already.

[paperclover]

For now, it is recommended to use bun test instead of vitest, and opening issues for any features we don't support.

[cecilia-sanare]

@paperdave
I mean, the entire reason I'm using vitest over bun test is due to the lack of support for exporting to lcov which already has an open issue (#4015).

Also the reason I opened this issue wasn't for the same reason as #4145.
Honestly I couldn't care less if vitest worked purely in bun or not.

My issue is that in a variety of scenarios bun will just hang silently rather then giving any indication something is wrong.

[Electroid]

My issue is that in a variety of scenarios bun will just hang silently rather then giving any indication something is wrong.

Unfortunately, we do not have a catch-all ability to fix all scenarios where Bun hangs. If you do encounter something where Bun hangs, please report it in a seperate issue with some code so we can reproduce it.