[Bug]: Jest and babel-jest 27.3.0v update gives error on running tests

[eshanCV]

Version

27.3.0

Steps to reproduce

Updated the jest and babel-jest versions to 27.3.0v and gives below error,

Expected behavior

Should be able to run my existing tests without any error

Actual behavior

Gives above mentioned error

Additional context

No response

Environment

System:
    OS: Windows 10 10.0.19043
    CPU: (12) x64 Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
Binaries:
    Node: 16.2.0 - C:\Program Files\nodejs\node.EXE        
    Yarn: 1.22.10 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 7.13.0 - C:\Program Files\nodejs\npm.CMD
npmPackages:
    jest: ^27.3.0 => 27.3.0

[SimenB]

Please provide a reproduction

[eshanCV]

Please provide a reproduction

Hi @SimenB,

Please find the reproduction URL

[mrazauskas]

@eshanCV The identity-obj-proxy library is not a Jest transformer. That’s why you get that error.

Remove identity-obj-proxy from the transform object in Jest config and all will work as expected.

[eshanCV]

@eshanCV The identity-obj-proxy library is not a Jest transformer. That’s why you get that error.

Remove identity-obj-proxy from the transform object in Jest config and all will work as expected.

Hi @mrazauskas,

Thanks for the reply, But after removing it, gives below error,

[mrazauskas]

@eshanCV Do not remove the identity-obj-proxy module. Just delete it from transform object in your Jest config. Follow this guide from Jest docs – https://jestjs.io/docs/webpack#mocking-css-modules

This is not a bug.

[eshanCV]

@mrazauskas Thanks, removing identity-obj-proxy and adding testEnvironment worked for me

[github-actions]

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