automock is crashing

[Alexsey]

🐛 Bug Report

When setting in jest.config.js property automock: true the tests run is crashing with error

>npx jest
 FAIL  ./index.test.js
  ×  (30ms)

  ● 

    TypeError: Cannot destructure property 'formatters' of 'module.exports' as it is undefined.

    > 1 | require('dotenv-parse-variables')
        | ^
      2 | 

      at Object.<anonymous> (node_modules/debug/src/node.js:238:8)
      at Object.<anonymous> (index.js:1:1)
      at Object.<anonymous> (index.test.js:4:3)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        2.893s, estimated 4s
Ran all test suites.

To Reproduce

Consider two files: index.js

require('dotenv-parse-variables')

index.test.js

jest.unmock('./index')

test('', () => {
  require('./index')
})

Steps to reproduce the behavior: run npx jest

Expected behavior

Jest should not crash

Link to repl or repo (highly encouraged)

https://github.com/Alexsey/jest-automock-crash

envinfo

>npx envinfo --preset jest
npx: installed 1 in 2.334s

  System:
    OS: Windows 10 10.0.18362
    CPU: (4) x64 Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
  Binaries:
    Node: 13.7.0 - C:\Program Files\nodejs\node.EXE
    npm: 6.13.6 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    jest: ^25.1.0 => 25.1.0

[carsonreinke]

I was able to reproduce this issue and appears the problem is with mocking modules that return a method.

Here is a simple example:

//my-module
function setup() {
    return {
        stuff: 'it'
    };
}

module.exports = setup;

With mocking, require('./my-module')() will return undefined.

That specific issue is from the debug package internally expecting a specific object after calling the method from the export.

[aMoniker]

I'm also seeing this issue from the debug package. Do you know of any fix or workaround?

[MuriloEduardo]

I'm having the same error when using automock true. Is this still an unresolved issue?

[mattjbrent]

this is actually a major issue - i've just been spending hours trying to figure out why automocking is failing using jest.mock('my_node_module_name');

when automocking a class accessing ClassName.mock.instances[0] returns an empty object.

I tried debugging by creating a custom mock in mocks with the same name as the node_modules library and im receiving TypeError: Cannot destructure property 'formatters' of 'module.exports' as it is undefined. error.

It seems that these might be related?

[mattjbrent]

i didnt receive this error until I added automock: true to jest config json file as files in mocks werent creating an automock - they were failing silently.

This hasnt been picked up in months and renders this package pretty defunct for our integration tests. Any news on an update or fix?

[mattjbrent]

looks like this links to #6127

[github-actions[bot]]

This issue is stale because it has been open for 1 year with no activity. Remove stale label or comment or this will be closed in 30 days.

[Alexsey]

Still relevant

[github-actions[bot]]

This issue is stale because it has been open for 1 year with no activity. Remove stale label or comment or this will be closed in 30 days.

[Alexsey]

Still relevant