Cannot write file because it would overwrite input file in 25.3.0 when allowJs enabled

[vkrol]

Issue :

If allowJs setting is enabled, the Cannot write file ... because it would overwrite input file is thrown.

Expected behavior :

No error.

Debug log:

log file content

# content of ts-jest.log :
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Minimal repo

• https://github.com/vkrol/ts-jest-25.3.0-allow-js-bug
• https://github.com/vkrol/ts-jest-25.3.0-allow-js-bug/runs/545108331?check_suite_focus=true#step:6:13

[ahnpnl]

This seems new to me, does it happen to 25.2.1 ?

[vkrol]

No.

[ahnpnl]

Thanks, seem like it has been there silently for a long time.

[ahnpnl]

This error came from typescript itself. Perhaps you can take a look at this microsoft/TypeScript#14538

FYI: The error happens when the JavaScript file was considered part of the project, and your compilation will override these files.

[vkrol]

The most upvoted answers suggest to set noEmit to true or exclude outDir. noEmit: true doesn't help and outDir doesn't set in the my example.

[ahnpnl]

tsc gives me the same result. So I can confirm it's really related to project configuration. Not sure if ts-jest can do anything in this case

Updated 1: I think maybe I found a fix for this. Stay tune.
Updated 2: So you do need to set outDir for this case. You can do "outDir": "$$ts-jest$$".

Since this is related to ts configuration, not ts-jest internal so I would like to close this as won't fix.

[vkrol]

tsc gives me the same result. So I can confirm it's really related to project configuration. Not sure if ts-jest can do anything in this case

noEmit helps in this case. But it doesn't help for ts-jest, so I disagree that this is only a TS configuration issue.

[ahnpnl]

tsc gives me the same result. So I can confirm it's really related to project configuration. Not sure if ts-jest can do anything in this case

noEmit helps in this case. But it doesn't help for ts-jest, so I disagree that this is only a TS configuration issue.

Ok I found another way for this. ts-jest can say: If user enables allowJs but doesn't specify outDir, ts-jest will set outDir to default $$ts-jest$$.

[vkrol]

Will this directory really be created?

[ahnpnl]

nope, I just tested that change locally, I can see the test passed but that directory isn't created.

Please test against branch in PR #1472 :)

[vkrol]

@ahnpnl awesome. Thanks!

[vnues]

"noEmit":true