Jest: TypeError: _gracefulFs(...).realpathSync.native is not a function

[MalauD]

Hi,
I got this weird error, am I missing something ?

🐛 Bug Report

When i try to run jest from the cli i got this error. Here is the complete traceback:

TypeError: _gracefulFs(...).realpathSync.native is not a function
    at tryRealpath (C:\Users\malau\Documents\ProjetJS\MOPJs\node_modules\jest-config\node_modules\jest-util\build\tryRealpath.js:26:39)
    at getCacheDirectory (C:\Users\malau\Documents\ProjetJS\MOPJs\node_modules\jest-config\build\getCacheDirectory.js:89:33)
    at Object.<anonymous> (C:\Users\malau\Documents\ProjetJS\MOPJs\node_modules\jest-config\build\Defaults.js:39:50)
    at Module._compile (module.js:653:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)

To Reproduce

Steps to reproduce the behavior:
npm install --save-dev jest jest-cli; npx jest --init or .\node_modules\.bin\jest --init
Even just npx jest fail with the same error.

Link to repl or repo (highly encouraged)

My Project

envinfo

npx: installed 1 in 2.519s

  System:
    OS: Windows 10 10.0.18362
    CPU: (4) x64 Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz
  Binaries:
    Node: 8.12.0 - C:\Program Files\nodejs\node.EXE
    npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    jest: ^26.0.1 => 26.0.1

EDIT: With the latest version of node (14.2.0) it works without any issues.

Thank you in advance for your help !

[SimenB]

We do not support node 8, you need to upgrade to node 10 or keep using Jest 25 which supports node 8

[mcandre]

I get the same error in Node.js 12. Can we please drop this native junk and use basic standard library functions?

[SimenB]

Can we please drop this native junk

What a wonderfully productive way to ensure you get help with your issue

use basic standard library functions?

This is part of Node.js core

https://nodejs.org/api/fs.html#fs_fs_realpathsync_native_path_options

[gdubs]

We do not support node 8, you need to upgrade to node 10 or keep using Jest 25 which supports node 8

i updated to 12, still having the same error. do i need to stay at exactly 10?

[thymikee]

@gdubs you can use whatever version since 10.14.2. Make sure you re-install your deps to update native bindings when changing Node versions

[dginovker]

Easiest way to re-install dependencies after upgrading Node version to 10+ is to remove node_modules and package-lock.json. Just type yarn or npm i from there :smile:

[Darrekt]

Sorry, but I'm not too clear on why this issue is closed. I'm running Mac OS Catalina, and have the same issue.

TypeError: _gracefulFs(...).realpathSync.native is not a function
    at tryRealpath (/Users/darrekt/Documents/forest-ranger/functions/node_modules/jest-util/build/tryRealpath.js:26:39)
    at getCacheDirectory (/Users/darrekt/Documents/forest-ranger/functions/node_modules/jest-config/build/getCacheDirectory.js:89:33)
    at Object.<anonymous> (/Users/darrekt/Documents/forest-ranger/functions/node_modules/jest-config/build/Defaults.js:39:50)
    at Module._compile (internal/modules/cjs/loader.js:1156:30)
    at Module._compile (pkg/prelude/bootstrap.js:1281:32)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Module.require (internal/modules/cjs/loader.js:1042:19)
    at Module.require (pkg/prelude/bootstrap.js:1225:31)

I've tried:
Deleting, recloning and npm install my git repository. Each time, I delete package-lock.json and node_modules in their entirety. This seemed to fix an issue that was happening with fs during npm install...?

Anyway, the error still persisted, so I tried rolling back to Node.js 12.17.0 (was previously on 14). Same error occurs.

I tried completely removing node version manager and reinstalling Node, only to still find the same issue. I can't find much help anywhere else online, so I thought I'd leave a comment here. The weirdest part is that it works on my older macbook which is running the same OS with the same version of node, installed with nvm. It also works on my Ubuntu workstation.

Here's my envinfo and package.json, if it helps. This is the first time I'm reporting an issue, so do let me know if there's anything else I can provide!

envinfo

``` System:
OS: macOS 10.15.4
CPU: (8) x64 Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
Memory: 7.10 GB / 16.00 GB
Shell: 5.7.1 - /bin/zsh
Binaries:
Node: 12.17.0 - ~/.nvm/versions/node/v12.17.0/bin/node
npm: 6.14.4 - ~/.nvm/versions/node/v12.17.0/bin/npm
Managers:
Homebrew: 2.2.17 - /usr/local/bin/brew
pip3: 20.1.1 - ~/.pyenv/shims/pip3
RubyGems: 3.0.3 - /usr/bin/gem
Utilities:
Make: 3.81 - /usr/bin/make
GCC: 4.2.1 - /usr/bin/gcc
Git: 2.24.3 - /usr/bin/git
Clang: 1103.0.32.62 - /usr/bin/clang
Servers:
Apache: 2.4.41 - /usr/sbin/apachectl
IDEs:
Nano: 2.0.6 - /usr/bin/nano
VSCode: 1.45.1 - /usr/local/bin/code
Vim: 8.1 - /usr/bin/vim
Xcode: /undefined - /usr/bin/xcodebuild
Languages:
Bash: 3.2.57 - /bin/bash
Java: 14.0.1 - /usr/bin/javac
Perl: 5.18.4 - /usr/bin/perl
PHP: 7.3.11 - /usr/bin/php
Python: 3.7.7 - /Users/darrekt/.pyenv/shims/python
Python3: 3.7.7 - /Users/darrekt/.pyenv/shims/python3
Ruby: 2.6.3 - /usr/bin/ruby
Databases:
PostgreSQL: 12.3 - /usr/local/bin/postgres
SQLite: 3.28.0 - /usr/bin/sqlite3
Browsers:
Chrome: 83.0.4103.61
Safari: 13.1

### package.json

{
"name": "functions",
"scripts": {
"start": "concurrently -n tsc,firebase \"npm run watch\" \"firebase emulators:start --only firestore,functions\"",
"test": "npm run build && firebase emulators:exec --only firestore,functions jest",
"test-debug": "node --inspect-brk node_modules/.bin/jest --runInBand",
"build": "tsc",
"watch": "tsc --watch",
"lint": "tslint --project tsconfig.json",
"shell": "npm run build && firebase functions:shell",
"deploy": "firebase deploy --only functions",
"logs": "firebase functions:log"
},
"engines": {
"node": "10"
},
"jest": {
"testEnvironment": "jest-environment-uint8array"
},
"main": "lib/index.js",
"dependencies": {
"express": "^4.17.1",
"firebase-admin": "^8.10.0",
"firebase-functions": "^3.6.1"
},
"devDependencies": {
"@firebase/testing": "^0.19.4",
"@types/express": "^4.17.6",
"concurrently": "^5.2.0",
"copyfiles": "^2.2.0",
"firebase": "^7.14.4",
"firebase-functions-test": "^0.2.0",
"jest": "^26.0.1",
"jest-environment-uint8array": "^1.0.0",
"tslint": "^5.12.0",
"typescript": "^3.8.0"
},
"private": true
}
```

[dedanmsafari]

I got the same error with Jest but my cause was because of the node version i was using.....I upgraded from 8.16 to the latest version 12 and the error disappeared.Sounds like older versions of node are slowly becoming deprecated while using Jest

[ktarasov-clearscale]

Confirm the problem.
If it relates to the node version my node is 10.15.0.

[LiorRacer]

Confirm the problem.
If it relates to the node version my node is 10.15.0.

The same for me, I upgraded to node 13.12.0 from 10.15.0 and it solve it

[SimenB]

Node 10.15.0 has realpathSync.native, as does graceful-fs when required.

// file.js
console.log(process.version);
console.log(typeof require('fs').realpathSync.native);
console.log(typeof require('graceful-fs').realpathSync.native);

$ node file.js
v10.15.0
function
function

If anyone can provide a reproduction that fails on Node 10.15 I'm happy to take a look. Something we can clone, run install, run jest and see the error.

A really reduced example would be calling the function that throws, e.g.

'use strict';

const {tryRealpath} = require('jest-util');

// enter some absolute path of a file that exists
console.log(tryRealpath('/some/absolute/path'));

That's the function that throws in the stack traces posted in this issue

[liang520]

The same for me, I updated to node 14.6.0, running the jest is ok, when debugging the jest, I got the same error

TypeError: _gracefulFs(...).realpathSync.native is not a function
    at tryRealpath (/Users/chenliang/Desktop/partice/vue-next/node_modules/jest-util/build/tryRealpath.js:26:39)
    at getCacheDirectory (/Users/chenliang/Desktop/partice/vue-next/node_modules/jest-config/build/getCacheDirectory.js:89:33)
    at Object.<anonymous> (/Users/chenliang/Desktop/partice/vue-next/node_modules/jest-config/build/Defaults.js:39:50)
    at Module._compile (module.js:653:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)

[djedjethai]

Updating from node v8 to node v12.18.2, worked for me. Thanks.

[njyrbecker]

node v12.13.1 is not working for me - same error.

[liang520]

Updating from node v8 to node v12.18.2, worked for me. Thanks.

@djedjethai is working for debugging?

[djedjethai]

I use it to run my tests when i push my code to github.

[Machiaweliczny]

Failing on v10.15.3 for me with jest 26.2.0 (fixed when switched to ^25)

[RaviH]

Hello,

It seems like issue is still happening on Travis CI:

$ node --version
v12.18.3
$ npm --version
6.14.6
$ nvm --version
0.35.3
$ yarn --version
1.22.4
before_install.1
8.52s$ curl -sL https://firebase.tools | bash
before_install.2
0.00s$ export PATH="$HOME/.yarn/bin:$PATH"
install
1.10s$ yarn --frozen-lockfile
1.14s$ yarn install
yarn install v1.22.4
[1/5] Validating package.json...
[2/5] Resolving packages...
success Already up-to-date.
The command "yarn install" exited with 0.
11.75s$ firebase emulators:exec --only firestore './functional-test-setup.sh'
⚠  emulators: You are not currently authenticated so some features may not work correctly. Please run firebase login to authenticate the CLI.
i  emulators: Starting emulators: firestore
⚠  It appears you are running in a CI environment. You can avoid downloading the Firestore Emulator repeatedly by caching the /home/travis/.cache/firebase/emulators directory.
i  firestore: downloading cloud-firestore-emulator-v1.11.7.jar...
- (55% of 64MB)i  firestore: Firestore Emulator logging to firestore-debug.log
i  Running script: ./functional-test-setup.sh
Starting tests!
yarn run v1.22.4
$ jest --env=jest-environment-jsdom-sixteen --runInBand --coverage=true
TypeError: _gracefulFs(...).realpathSync.native is not a function
    at tryRealpath (/home/travis/build/RaviH/radiology-cored/node_modules/jest-util/build/tryRealpath.js:26:39)
    at getCacheDirectory (/home/travis/build/RaviH/radiology-cored/node_modules/jest-cli/node_modules/jest-config/build/getCacheDirectory.js:89:33)
    at Object.<anonymous> (/home/travis/build/RaviH/radiology-cored/node_modules/jest-cli/node_modules/jest-config/build/Defaults.js:49:50)
    at Module._compile (internal/modules/cjs/loader.js:1136:30)
    at Module._compile (pkg/prelude/bootstrap.js:1281:32)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1156:10)
    at Module.load (internal/modules/cjs/loader.js:984:32)
    at Function.Module._load (internal/modules/cjs/loader.js:877:14)
    at Module.require (internal/modules/cjs/loader.js:1024:19)
    at Module.require (pkg/prelude/bootstrap.js:1225:31)
error Command failed with exit code 1.

[lukasknutti]

I encounter the same issue running my tests in the firebase emulator. Using node 12.18 (running it on my machine outside of the emulator works fine)

i  functions[userCreated]: function ignored because the auth emulator does not exist or is not running.
i  functions[userDeleted]: function ignored because the auth emulator does not exist or is not running.
i  Running script: npm test

> functions@ test /Users/lukasknutti/Desktop/programming/th-firebase/functions
> jest --watchAll --verbose=true

TypeError: _gracefulFs(...).realpathSync.native is not a function
    at tryRealpath (/Users/lukasknutti/Desktop/programming/th-firebase/functions/node_modules/jest-util/build/tryRealpath.js:26:39)
    at getCacheDirectory (/Users/lukasknutti/Desktop/programming/th-firebase/functions/node_modules/jest-config/build/getCacheDirectory.js:89:33)
    at Object.<anonymous> (/Users/lukasknutti/Desktop/programming/th-firebase/functions/node_modules/jest-config/build/Defaults.js:49:50)
    at Module._compile (internal/modules/cjs/loader.js:1136:30)
    at Module._compile (pkg/prelude/bootstrap.js:1281:32)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1156:10)
    at Module.load (internal/modules/cjs/loader.js:984:32)
    at Function.Module._load (internal/modules/cjs/loader.js:877:14)
    at Module.require (internal/modules/cjs/loader.js:1024:19)
    at Module.require (pkg/prelude/bootstrap.js:1225:31)
npm ERR! Test failed.  See above for more details.
⚠  Script exited unsuccessfully (code 1)
i  emulators: Shutting down emulators.