`Buffer.buffer.transfer()` hangs in tests

[TomerAberbach]

Describe the bug

Buffer.buffer.transfer() hangs in tests

Note that it doesn't hang in a normal Node script. It only hangs in vitest

Reproduction

1. Clone https://github.com/TomerAberbach/vitest-transfer-bug
2. Run pnpm i
3. Run pnpm test

System Info

System:
    OS: macOS 14.6.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 725.66 MB / 32.00 GB
    Shell: 4.0.8 - /opt/homebrew/bin/fish
  Binaries:
    Node: 24.8.0 - /opt/homebrew/bin/node
    Yarn: 1.22.22 - /opt/homebrew/bin/yarn
    npm: 11.6.0 - /opt/homebrew/bin/npm
    pnpm: 10.17.0 - /opt/homebrew/bin/pnpm
    bun: 1.2.22 - /opt/homebrew/bin/bun
  Browsers:
    Chrome: 144.0.7559.133
    Edge: 144.0.3719.115
    Firefox: 146.0.1
    Safari: 17.6
  npmPackages:
    vitest: ^4.0.18 => 4.0.18

Used Package Manager

pnpm

Validations

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• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
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• The provided reproduction is a minimal reproducible example of the bug.

[hi-ogawa]

Node 25.6 changed the behavior to disallows Buffer.buffer.transfer() and now it's an error. The behavior before that was inconsistent and it appears it wasn't meant to work. See

• Can not construct Buffer after different Buffer was previously transfererd nodejs/node#61362
• buffer: disallow ArrayBuffer transfer on pooled buffer nodejs/node#61372

With Node 25, the test won't hang and properly reports error:

~/code/others/vitest $ node --version
v25.6.1
~/code/others/vitest $ pnpm -C examples/basic test repro

> @vitest/example-test@ test /home/hiroshi/code/others/vitest/examples/basic
> vitest repro


 DEV  v4.1.0-beta.4 /home/hiroshi/code/others/vitest/examples/basic

 ❯ test/repro.test.js (1 test | 1 failed) 3ms
   × Buffer.buffer.transfer() 2ms

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Failed Tests 1 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

 FAIL  test/repro.test.js > Buffer.buffer.transfer()
TypeError: ArrayBuffer is not detachable and could not be cloned.
 ❯ test/repro.test.js:4:33
      2|
      3| test('Buffer.buffer.transfer()', () => {
      4|   Buffer.from([1, 2, 3]).buffer.transfer();
       |                                 ^
      5| });
      6|

Closing since this is not a vitest issue.

[TomerAberbach]

Ah nice, thanks for finding that