An exception is thrown when executing jest.

[MSakamaki]

Describe the bug

When I run jest on a stackblitz nodejs, I get the following error
this does not happen with local nodejs.

TypeError: 'getOwnPropertyDescriptor' on proxy: trap returned undefined for property 'jest-symbol-do-not-touch' which is non-configurable in the proxy target

Link to the blitz that caused the error

https://stackblitz.com/edit/node-ked4s2

Steps to reproduce

I looked into it as much as I could, but it seems that if you add properties to a global object defined in node-vm by Object.defineProperties, it crashes when you access it.

Here is a small piece of code to reproduce it.

const { runInContext, createContext } = require('vm');

const context = createContext();
const global = (this.global = runInContext('this', context));

Object.defineProperties(global, {
  'jest-symbol-do-not-touch': {
    enumerable: false,
    value: global.Symbol,
    writable: false
  }
});

console.log(global['x']); // success
console.log(global['jest-symbol-do-not-touch']); // error
Object.keys(global); // error

Expected behavior

the reproduced code above works fine locally, so it should also work fine on stackblitz.

Screenshots

Platform

• OS: macOS
• Browser: Chrome
• Version: 92.0.4515.131

Additional context

No response

[freehuntx]

I think this is related to how "Proxy" is implemented inside of WebContainers node.
jest relies on Proxy as you can see here: https://github.com/facebook/jest/blob/bc50e7f360ab1845abbaa0b3ad788caead0d3174/packages/jest-util/src/createProcessObject.ts
and
https://github.com/facebook/jest/blob/59f42d86756fcc3c9caf0c8a5cf1b13324941d4e/packages/jest-runtime/src/index.ts
So if the implementation of Proxy is broken inside of WebContainers node, that might be the reason.

Logging global.Proxy inside of my main machine gives me: [Function: Proxy]
Logging it inside of WebContainers node gives me: [Function: bound Proxy]

[freehuntx]

Maybe related with:
nodejs/node#30985
nodejs/node#17465

[freehuntx]

A workaround is, to set configurable to true.
test/test-environment.js

const defineProperties = Object.defineProperties;
Object.defineProperties = function(obj, props) {
  if (props['jest-symbol-do-not-touch']) {
    props['jest-symbol-do-not-touch'].configurable = true;
  }
  return defineProperties(obj, props);
};

module.exports = require('jest-environment-node');

package.json

...
  "jest": {
    "testEnvironment": "./test/test-environment.js"
  }
...

Note: This issue has been fixed. So this workaround is not needed anymore!

[MSakamaki]

Thanks for the kind reply!
I have confirmed that jest 27 will run with the solution you suggested.
https://stackblitz.com/edit/node-qsuzv8

since my issue has been solved, I will close this issue.

[freehuntx]

This still looks like a bug that shouldnt happen imo. I would not close it as such a bug can cause alot of different bugs.
It should definitely be investigated.

[freehuntx]

Note: This has been fixed. So no workaround anymore needed!