[Bug]: Not able to access window in vm.runInContext

[rahulmr-ibm]

Version

29.7.0

Steps to reproduce

Create these files, then npm I and npm test
Package.json

{
  "name": "jsdom-tes",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "test": "jest"
  },
  "author": "",
  "license": "ISC",
  "description": "",
  "devDependencies": {
    "jest": "^29.7.0",
    "jest-environment-jsdom": "^29.7.0"
  },
  "dependencies": {
    "jsdom": "^24.1.0"
  }
}

My jest config file

const config = {
    testEnvironment: 'jsdom',
    setupFilesAfterEnv: [ "<rootDir>/jestSetup.js"],
    testMatch: ["<rootDir>/test/__test__/mytest.test.js"],
  };
  
  module.exports = config;

Jest setup. file

const vm = require('node:vm');
const fs = require( "fs" );

const ctx = vm.createContext(global);
ctx.hello = "helloworld";
ctx.window = "window";
const sContents = 'var a =1'


try {
  const result = vm.runInContext(`${sContents}; console.log(hello); console.log(window) `, ctx);
} catch(e) {
  console.log(e.stack, 'err1');
  console.log('x is', ctx.x)
}

whenever I run this code in Node 20, im getting reference errors, working correctly in Node 16

evalmachine.<anonymous>:12
    ; console.log(hello); console.log(window) 
                                      ^
    
    ReferenceError: window is not defined

Expected behavior

window and other Dom should be accessible for tests

Actual behavior

I'am working on a legacy project, I was running on node 16.
I tried to upgrade node to 20, and seeing these errors.
when run using vm.runInContext, not able to access window or document.

Additional context

No response

Environment

System:
    OS: macOS 14.5
    CPU: (12) arm64 Apple M3 Pro
  Binaries:
    Node: 20.14.0 - ~/.nvm/versions/node/v20.14.0/bin/node
    npm: 10.7.0 - ~/.nvm/versions/node/v20.14.0/bin/npm
  npmPackages:
    jest: ^29.7.0 => 29.7.0

[rahulmr-ibm]

when we are doing vm.createContext(global), we are not able to access window in the js files, even though we have injected window into context

[SimenB]

You're trying to run vm inside of vm, which is not really supported. Why do you need to do that?

[rahulmr-ibm]

You're trying to run vm inside of vm, which is not really supported. Why do you need to do that?

Im working on a legacy js project, we don't have export and import. so we are using vm.createcontext to inject some js files globally before all tests runs, especially some class.
Is there any better approach to do this.
Also what do you mean by vm inside vm ?

[SimenB]

inject some js files globally before all tests runs, especially some class.
Is there any better approach to do this.

https://jestjs.io/docs/configuration#setupfiles-array should do what you want.

Also what do you mean by vm inside vm ?

Jest already runs all tests within separate vm contexts

[rahulmr-ibm]

inject some js files globally before all tests runs, especially some class.
Is there any better approach to do this.

https://jestjs.io/docs/configuration#setupfiles-array should do what you want.

Also what do you mean by vm inside vm ?

Jest already runs all tests within separate vm contexts

Still we need to inject the class and singletons to the global object right ?. since we don't have exports and imports
for example

var myVar = {};
myVar.getName = function(){
    return 'rahul mr'
}

it('hello this is my test', () => {
    console.log('hello', myVar.getName());
})

For this to work , we are required to run vm.runincontext() with global as context