Error: kill EPERM

[MeirionHughes]

Bug

There seems to have been a change in node > 20 that is causing start-server-and-test to error due to child processes (cypress + electron) closing.

Child process 24584 exited before trying to stop it
Error: kill EPERM
    at process.kill (node:internal/process/per_thread:228:13)
    at D:\testing\vue-project\node_modules\start-server-and-test\src\index.js:62:23
    at Array.forEach (<anonymous>)
    at D:\testing\vue-project\node_modules\start-server-and-test\src\index.js:60:20
    at tryCatcher (D:\testing\vue-project\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (D:\testing\vue-project\node_modules\bluebird\js\release\promise.js:547:31)
    at Promise._settlePromise (D:\testing\vue-project\node_modules\bluebird\js\release\promise.js:604:18)
    at Promise._settlePromise0 (D:\testing\vue-project\node_modules\bluebird\js\release\promise.js:649:10)
    at Promise._settlePromises (D:\testing\vue-project\node_modules\bluebird\js\release\promise.js:729:18)
    at Promise._fulfill (D:\testing\vue-project\node_modules\bluebird\js\release\promise.js:673:18)
    at D:\testing\vue-project\node_modules\bluebird\js\release\nodeback.js:42:21
    at D:\testing\vue-project\node_modules\ps-tree\index.js:87:7
    at a.end (D:\testing\vue-project\node_modules\event-stream\index.js:87:5)
    at Stream.onend (node:internal/streams/legacy:48:10)
    at Stream.emit (node:events:531:35)
    at end (D:\testing\vue-project\node_modules\map-stream\index.js:116:39) {
  errno: -4048,
  code: 'EPERM',
  syscall: 'kill'
}

I'm not sure what the root cause is, or even which library is causing the error. But as the overall runner, it seems like its start-server-and-test not liking child processes closing or closing in an irregular way.

Reproduce - leverage vue to create a project scaffold of start-server-and-test + server + cypress runner:

• npm create vue@latest
• No for everything - choose cypress.
• npm install
• npm run build
• npm run test:e2e

run the test:e2e a few times as it can be a race-condition.

shell: windows 11, cmd or ps
node -v : 21.7.3 and 22.3.0
npm why start-server-and-test : [email protected]
npm why cypress: [email protected]

This specifically seems to be an issue on node > 20, as in node 20 you only get the messages "Child process [number] exited before trying to stop it", but it doesn't Error.

If you swap out vite for http-server ( "preview": "http-server ./dist -p 4173", ) you still get the Error: kill EPERM. If you remove start-server-and-test, add and run "cypress": "cypress run --e2e", along with separate term for preview it exits without error.