Rewire throws a Type Error when overriding a const while running Jest tests

[Shakakai]

🐛 Bug Report

Rewire throws a Type Error when overriding a const variable while running Jest tests.

To Reproduce

• Create a javascript file to test with a top-level variable set as a const and a simple test function
• Create a Jest test file, use rewire to import the above module, use rewire.set to change the const value

See my repo below for a working example.

Expected behavior

I expect the Jest test to execute succesfully in the same way the Mocha tests currently do.

Link to Repo

Github Repo with bug: https://github.com/Shakakai/jest-rewire-const-error

Run npm test

~~/v8.10.0/bin/node ~~/v8.10.0/lib/node_modules/npm/bin/npm-cli.js test --scripts-prepend-node-path=auto

> [email protected] test ~~/jest-rewire-const-error
> mocha ./test/example.mocha.js && jest example



  Show mocha works
    ✓ should add the numbers together


  1 passing (5ms)

 FAIL  test/example.jest.test.js
  ● Test suite failed to run

    TypeError: Assignment to constant variable.

      at eval (eval at __set__ (example.js:72:5), <anonymous>:1:3)
      at Function.__set__ (example.js:72:5)
      at Object.<anonymous> (test/example.jest.test.js:6:15)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        0.905s
Ran all test suites matching /example/i.
npm ERR! Test failed.  See above for more details.

Process finished with exit code 1

[luanmuniz]

Also having this problem. Any news here?

[rickhanlonii]

Hey all - I'm not familiar with rewire but it seems like they support mocha and not jest?

If someone from the rewire team wants to diagnose and let us know what, if anything, is broken or missing in Jest then I'm happy to take a look!

[github-actions]

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