Worker crashes during jest testing

[vinylhero]

Summary

I'm trying to implement Stryker in my NX project on a small part of the code initially. I've managed to configure stryker to run my tests which seems to be happening. It seems like the process is running but i'm getting the below error, which I can't work out. As you can see the tests are running, but there's a random worker message that's blowing up.

16:09:42 (71394) ERROR Stryker Unexpected error occurred while running Stryker ChildProcessCrashedError: Child process [pid 71423] exited unexpectedly with exit code 1 (without signal). Last part of stdout and stderr was:
        PASS my-lib libs/my-lib/src/lib/factory/factory.spec.ts

        Test Suites: 1 passed, 1 total
        Tests:       2 passed, 2 total
        Snapshots:   0 total
        Time:        3.571 s
        Error: Unknown worker message type message
        This is caused by either a bug in Node.js or incorrect usage of Node.js internals.
        Please open an issue with this stack trace at https://github.com/nodejs/node/issues

            at Function.fail (node:internal/assert:20:9)
            at Worker.[kOnMessage] (node:internal/worker:354:12)
            at MessagePort.<anonymous> (node:internal/worker:232:57)
            at _ZoneDelegate.invokeTask (my-project/node_modules/zone.js/bundles/zone.umd.js:449:37)
            at ZoneImpl.runTask (my-project/node_modules/zone.js/bundles/zone.umd.js:196:51)
            at ZoneTask.invokeTask [as invoke] (my-project/node_modules/zone.js/bundles/zone.umd.js:531:38)
            at invokeTask (my-project/node_modules/zone.js/bundles/zone.umd.js:1196:22)
            at globalCallback (my-project/node_modules/zone.js/bundles/zone.umd.js:1227:31)
            at MessagePort.globalZoneAwareCallback (my-project/node_modules/zone.js/bundles/zone.umd.js:1263:20)
            at MessagePort.[nodejs.internal.kHybridDispatch] (node:internal/event_target:820:20)
            at MessagePort.<anonymous> (node:internal/per_context/messageport:23:28) {
          code: 'ERR_INTERNAL_ASSERTION'
        }

    at ChildProcess.handleUnexpectedExit (file://my-project/node_modules/@stryker-mutator/core/dist/src/child-proxy/child-process-proxy.js:180:31)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5) {
  innerError: undefined,
  pid: 71423,
  exitCode: 1,
  signal: null
}

Stryker config

{
  "$schema": "./node_modules/@stryker-mutator/core/schema/stryker-schema.json",
  "packageManager": "npm",
  "reporters": ["html", "clear-text", "progress"],
  "coverageAnalysis": "perTest",
  "testRunner": "jest",
  "jest": {
    "projectType": "custom",
    "configFile": "libs/my-lib/jest.config.ts"
  },
  "checkers": ["typescript"],
  "tsconfigFile": "libs/my-lib/tsconfig.lib.prod.json",
  "typescriptChecker": {
    "prioritizePerformanceOverAccuracy": true
  },
  "commandRunner": {
    "command": "npx nx run web-auth-shell:test"
  },
  "symlinkNodeModules": false,
  "mutate": [
    "libs/my-lib/src/lib/**/*.ts",
    "!libs/my-lib/src/lib/**/*.spec.ts",
    "!libs/my-lib/src/lib/**/*.module.ts",
    "!libs/my-lib/src/lib/**/*.routes.ts",
    "!libs/my-lib/src/lib/api/**"
  ],
  "tempDirName": "libs/my-lib/.stryker-tmp",
  "fileLogLevel": "trace",
  "logLevel": "debug",
  "concurrency": 1
}

Test runner config

export default {
  displayName: 'web-auth-shell',
  preset: '../../jest.preset.js',
  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
  globals: {},
  coverageDirectory: '../../coverage/libs/my-lib',
  transform: {
    '^.+.(ts|mjs|js|html)$': [
      'jest-preset-angular',
      {
        tsconfig: '<rootDir>/tsconfig.spec.json',
        stringifyContentPathRegex: '\\.(html|svg)$',
      },
    ],
  },
  transformIgnorePatterns: ['node_modules/(?!.*.mjs$)'],
  snapshotSerializers: [
    'jest-preset-angular/build/serializers/no-ng-attributes',
    'jest-preset-angular/build/serializers/ng-snapshot',
    'jest-preset-angular/build/serializers/html-comment',
  ],
  testMatch: ['<rootDir>/src/**/?(*.)+(spec|test).ts?(x)'],
};

Stryker environment

"@stryker-mutator/core": "^8.6.0",
"@stryker-mutator/jest-runner": "^8.6.0",
"@stryker-mutator/typescript-checker": "^8.6.0",

    "jest": "29.7.0",
    "jest-preset-angular": "14.1.1",
    "@nx/angular": "~20.0.2",
    "@nx/devkit": "~20.0.2",
    "@nx/eslint": "~20.0.2",
    "@nx/eslint-plugin": "~20.0.2",
    "@nx/jest": "~20.0.2",
    "@nx/js": "~20.0.2",
    "@nx/plugin": "~20.0.2",
    "@nx/storybook": "~20.0.2",
    "@nx/workspace": "~20.0.2",

Test runner environment

npx stryker run libs/my-lib/stryker.config.json

Your Environment

software	version(s)
node	20.18.0
npm	10.8.2
Operating System	Mac Sonoma 14.6.1