Vitest runner reports TypeError: Cannot read properties of undefined (reading 'close')

[nicojs]

Summary

22:41:37 (29261) INFO HtmlReporter Your report can be found at: file:///home/nicojs/tmp/vue-project/reports/mutation/mutation.html
22:41:37 (29261) INFO MutationTestExecutor Done in 3 seconds.
22:41:37 (29261) WARN ChildProcessTestRunnerProxy An unexpected error occurred during test runner disposal. This might be worth looking into. Stryker will ignore this error. StrykerError: TypeError: Cannot read properties of undefined (reading 'close')

Stryker config

{
  "$schema": "./node_modules/@stryker-mutator/core/schema/stryker-schema.json",
  "_comment": "This config was generated using 'stryker init'. Please take a look at: https://stryker-mutator.io/docs/stryker-js/configuration/ for more information.",
  "packageManager": "npm",
  "mutate": [
    "{src,lib}/**/!(*.+(s|S)pec|*.+(t|T)est).+(cjs|mjs|js|ts|jsx|tsx|html|vue)",
    "!{src,lib}/**/__tests__/**/*.+(cjs|mjs|js|ts|jsx|tsx|html|vue)"
  ],
  "reporters": [
    "html",
    "clear-text",
    "progress"
  ],
  "testRunner": "vitest"
}

Test runner config

import { fileURLToPath } from 'node:url'
import { mergeConfig } from 'vite'
import { configDefaults, defineConfig } from 'vitest/config'
import viteConfig from './vite.config'

export default mergeConfig(
  viteConfig,
  defineConfig({
    test: {
      environment: 'jsdom',
      exclude: [...configDefaults.exclude, 'e2e/*'],
      root: fileURLToPath(new URL('./', import.meta.url)),
      transformMode: {
        web: [/\.[jt]sx$/],
      },
    }
  })
)

Stryker environment

├── @stryker-mutator/core@7.0.2
├── @stryker-mutator/vitest-runner@7.0.2

├── vitest@0.31.4

Test runner environment

vitest

Add stryker.log
stryker.log

[nicojs]

The cause is that StrykerJS will call dispose even if init was never called. Let us try to fix this in StrykerJS's core: from a test-runners perspective, it doesn't make sense to dispose without init.

[islasjuanp]

Hi @nicojs 👋

Thanks for fixing this issue. I am integrating stryker-js in a small project with Vitest and I am facing this issue. Do you know when it will be available?

[nicojs]

This will be released in a week or so, but this is purely cosmetics afaik, you can simply ignore this warning in the meantime 😉

[nicojs]

Released in 7.1