TypeError: timer.unref is not a function

[xjamundx]

Do you want to request a feature or report a bug?

Bug, or just support request (sorry!)

What is the current behavior?

Lots of errors around TypeError: timer.unref is not a function when trying to run jest on my mocha tests.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal repository on GitHub that we can npm install and npm test.

Yeah just do this

test.js

test('thing', () => {
   var timer = setInterval(() => {}, 1)
   timer.unref()
})

And then run it with jest somehow.

 FAIL  tests/test2.js
  ● thing

    TypeError: timer.unref is not a function
      at Object.<anonymous> (tests/test.js:3:10)
      at process._tickCallback (node.js:364:9)

What is the expected behavior?

Not FAIL.

It works fine when you run the code directly with node. Also here is the API for it:
https://nodejs.org/api/timers.html#timers_timeout_unref

Run Jest again with --debug and provide the full configuration it prints. Please mention your node and npm version and operating system.

• node 4.5
• npm 3.10.8

Debug has basically the same output as above:

jest version = 16.0.1
test framework = jasmine2
config = {
  "testPathDirs": [
    "/Users/jamuferguson/dev/paypal/p2pnodeweb"
  ],
  "setupFiles": [
    "/Users/jamuferguson/dev/paypal/p2pnodeweb/node_modules/babel-polyfill/lib/index.js",
    "/Users/jamuferguson/dev/paypal/p2pnodeweb/tests/lib/setup-test-env-jest.js"
  ],
  "testRegex": "tests/test2.js",
  "testURL": "http://example.com",
  "testPathIgnorePatterns": [
    "/node_modules/",
    "/vendor",
    "/helpers/",
    "/fixtures/"
  ],
  "moduleNameMapper": [
    [
      "^.+\\.svg$",
      "/Users/jamuferguson/dev/paypal/p2pnodeweb/public/js/__mocks__/custom/file-mock.js"
    ]
  ],
  "coverageThreshold": {
    "global": {
      "branches": 29,
      "functions": 22,
      "lines": 32,
      "statements": 29
    }
  },
  "collectCoverageFrom": [
    "!public/js/{vendor,view,widgets,hooks,collection,model,lib}/**",
    "!public/js/{konami,bootstrap}.js"
  ],
  "coverageDirectory": "/Users/jamuferguson/dev/paypal/p2pnodeweb/coverage/react",
  "rootDir": "/Users/jamuferguson/dev/paypal/p2pnodeweb",
  "name": "-Users-jamuferguson-dev-paypal-p2pnodeweb",
  "testRunner": "/Users/jamuferguson/dev/paypal/p2pnodeweb/node_modules/jest-jasmine2/build/index.js",
  "scriptPreprocessor": "/Users/jamuferguson/dev/paypal/p2pnodeweb/node_modules/babel-jest/build/index.js",
  "usesBabelJest": true,
  "automock": false,
  "bail": false,
  "browser": false,
  "cacheDirectory": "/var/folders/9d/p3qfw0g94yz7qh3z9dr4btwm391xgk/T/jest",
  "clearMocks": false,
  "coveragePathIgnorePatterns": [
    "/node_modules/"
  ],
  "coverageReporters": [
    "json",
    "text",
    "lcov",
    "clover"
  ],
  "globals": {},
  "haste": {
    "providesModuleNodeModules": []
  },
  "mocksPattern": "__mocks__",
  "moduleDirectories": [
    "node_modules"
  ],
  "moduleFileExtensions": [
    "js",
    "json",
    "jsx",
    "node"
  ],
  "modulePathIgnorePatterns": [],
  "noStackTrace": false,
  "notify": false,
  "preset": null,
  "preprocessorIgnorePatterns": [
    "/node_modules/"
  ],
  "resetModules": false,
  "testEnvironment": "jest-environment-jsdom",
  "timers": "real",
  "useStderr": false,
  "verbose": null,
  "watch": false,
  "cache": true,
  "watchman": true,
  "testcheckOptions": {
    "times": 100,
    "maxSize": 200
  }
}
Determining test suites to run...watchman warning:  Recrawled this watch 1 times, most recently because:
/Users/jamuferguson/dev/paypal/p2pnodeweb: kFSEventStreamEventFlagUserDropped
To resolve, please review the information on
https://facebook.github.io/watchman/docs/troubleshooting.html#recrawl
To clear this warning, run:
`watchman watch-del /Users/jamuferguson/dev/paypal/p2pnodeweb ; watchman watch-project /Users/jamuferguson/dev/paypal/p2pnodeweb`

 FAIL  tests/test2.js
  ● thing

    TypeError: timer.unref is not a function

      at Object.<anonymous> (tests/test2.js:3:10)
      at process._tickCallback (node.js:364:9)

  ✕ thing (3ms)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        3.936s
Ran all test suites.

[xjamundx]

So far it seems my issue is related to the fact that the setInterval implementation being used is not the native node one, but instead one provided by JSDom.

console.log(setInterval.toString()) // inside the test

matches https://github.com/tmpvar/jsdom/blob/a6acac4e9dec4f859fff22676fb4e9eaa9139787/lib/jsdom/browser/Window.js#L176

[xjamundx]

The solution is to use "testEnvironment": "node"

http://facebook.github.io/jest/docs/configuration.html#testenvironment-string

[alejo4373]

I got here by googling this.pruneTimer.unref is not a function. I thought I was not gonna get any results but this issue was at the top. It was not an exact match yet I still decided to read it. The error was coming from connect-pg-simple. I'm using connect-pg-simple for session storage on an express app.

Setting "testEnvironment": "node" as mentioned here works.

Just leaving this here for anyone else that might need it.

[NathTech]

I'm also getting the TypeError: this.timerId.unref is not a function when testing React elements interacting with Firebase Firestore.

Changing the testEnvironment to node fixes the above error, but then obviously none of the useful dom implementations are available from jsdom :-/

Does anyone have any thoughts when you are trying to test React elements that need the jsdom environment for things like localStorage?

[matt-kinton]

@NathTech I'm getting the same issue, trying to write some integration tests wish Jest + JSDOM + React + Emulators but I'm blocked testing anything that uses firestore

[naourass]

Have the same warning when using Jest to test React + Firestore.

[matt-kinton]

Yes! someone else! Please comment on the issues I raised in other repositories for visibility :)

Here firebase/firebase-js-sdk#4552 and facebook/create-react-app#10626.

Found any workarounds @naourass?

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