Using Bun with @effect/vitest, tests fail to run

[chheller]

What version of Effect is running?

3.6.0

What steps can reproduce the bug?

Given

"bun": 1.1.21
"vitest": "2.0.5"
"@effect/vitest": "0.8.0"
"effect": "2.6.0"

And the following test

import { it, expect } from "@effect/vitest";
import { Effect } from "effect";

it.effect("should pass", () =>
  Effect.gen(function* () {
    yield* Effect.succeed("pass");
  }),
);

and provided package.json contains

{
  "scripts": {
    "test": "bun --bun vitest"
  },

What is the expected behavior?

❯ bun test
bun test v1.1.21 (70ca2b76)

src/vitest.test.ts:
✓ should pass [0.38ms]

1 pass
0 fail
1 expect() calls
Ran 1 tests across 1 files. [18.00ms]

What do you see instead?

using

bun vitest works as expected
bun test where the test script is bun vitest fails with

# Unhandled error between tests
-------------------------------
error: Cannot find package "test" from "/home/chheller/projects/effect-todo/node_modules/@effect/vitest/dist/esm/index.js"
-------------------------------


 0 pass
 1 fail
 1 error

bun --bun vitest will run, but then will hang forever. Canceling the test execution yields

Cancelling test run. Press CTRL+c again to exit forcefully.


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Vitest caught 1 unhandled error during the test run.
This might cause false positive tests. Resolve unhandled errors to make sure your tests are not affected.

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Unhandled Error ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
Error: Terminating worker thread
 ❯ ThreadTermination node_modules/tinypool/dist/index.js:470:32
 ❯ <anonymous> node_modules/tinypool/dist/index.js:522:30

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Serialized Error: { originalLine: 415, originalColumn: 37, line: 470, column: 32, sourceURL: '/home/chheller/projects/effect-todo/node_modules/tinypool/dist/index.js' }
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 Test Files  no tests
      Tests  no tests
     Errors  1 error
   Start at  13:44:28
   Duration  28.62s (transform 0ms, setup 0ms, collect 0ms, tests 0ms, environment 0ms, prepare 0ms)


 FAIL  Tests failed. Watching for file changes...
       press h to show help, press q to quit
error: "vitest" exited with code 1
24 |     const { filename, name } = message;                                                                                                                                                                     
25 |     (async function() {
26 |       if (filename !== null) {
27 |         await getHandler(filename, name);
28 |       }
29 |       send(
           ^
error: IPC Socket is no longer open

Additional information

Running a test without @effect/vitest using the package script "test": "bun --bun vitest" works as expected

import { expect, it } from "vitest";

it("should pass", () => {
  expect("pass").toEqual("pass");
})

However, bun --bun vitest directly from the CLI still hangs, which may simply suggest an issue with Bun and Vitest, which is further supported by #3264 and may be out of scope for Effect

[fubhy]

It is currently not possible to truly run vitest through bun. Waiting for oven-sh/bun#4145 to be resolved before we can support it.