jest.spyOn cannot redefine property

[zachbryant]

Describe the bug

In my project, upgrading from 1.2.205 leads to this error: TypeError: Cannot redefine property: myFunction at Function.defineProperty (<anonymous>). Seems to be different from other similar errors that I found online such as this one as I am not importing from an index file. The issue goes away when I downgrade to 1.2.205.

Input code

import * as anImport from './myFile'

describe('some test suite', () => {
    it('test 1', () => {
        const spy = jest.spyOn(anImport, 'myFunction').mockReturnValue(0)
        expect(anImport.someOtherFunc()).toBe(false)
    })
})

Config

{
    "jsc": {
        "parser": {
            "syntax": "typescript",
            "tsx": true,
            "decorators": false,
            "dynamicImport": false
        }
    }
}

Playground link (or link to the minimal reproduction)

https://github.com/zachbryant/swc-repro

SWC Info output

Operating System:
Platform: linux
Arch: x64
Machine Type: x86_64
Version: #16~22.04.1-Ubuntu SMP Tue Oct 10 17:11:51 UTC 2023
CPU: (16 cores)
Models: AMD EPYC 7763 64-Core Processor

Binaries:
Node: 18.18.2
npm: 9.8.1
Yarn: 1.22.19
pnpm: 8.10.2

Relevant Packages:
@swc/core: 1.2.213
@swc/helpers: 0.5.1
@swc/types: 0.1.5
typescript: 4.8.4

SWC Config:
output: N/A
.swcrc path: N/A

Next.js info:
output: N/A

Expected behavior

Expected test to pass as is, no issue.

Actual behavior

Test fails with aforementioned error.

Version

1.2.206 and above

Additional context

I tried loose mode etc to no avail. Switching my repo to use mocks/the mock esmodule workaround isn't an option.

I tried 1.2.206 and other higher versions and the error persisted. I'm on the latest of everything.

[kdy1]

#7435

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.