[Feature]: Throw when multiple configs are found

[mrazauskas]

🚀 Feature Proposal

#11922 implemented a warning which is printed when multiple configs are found. It was decided to add this feature as a warning, because throwing an error would be a breaking change.

Seems like now it is good time to refactor the warning into an error.

@jankaifer Would you be interested? Perhaps?

Motivation

Running Jest after several configs were detected is rather indeterministic. Failing early with informative message makes Jest better.

Example

No response

Pitch

It is already in the core (;

[jankaifer]

I could, but this seems like a great first-issue (even easier than the original one).
So I will gladly leave it to others.

[SimenB]

Yeah, good idea!

[TrickyPi]

I would like to work on this issue, can i take it?

[SimenB]

Yeah, go for it @TrickyPi! You can see what #11922 changed, and what you essentially want to do now is throw an error instead of just logging it 🙂

[TrickyPi]

ok, i get it, thanks!

[mrazauskas]

@TrickyPi And please do fix this tiny todo (the line was introduced with the above mentioned PR, Node 10 is not supported anymore so time to fix):

https://github.com/facebook/jest/blob/c2872aae7e3bdc8f9c236637ade294790a47d7f6/packages/jest-config/src/__tests__/resolveConfigPath.test.ts#L149-L150

[TrickyPi]

okay

[SimenB]

https://github.com/facebook/jest/releases/tag/v28.0.0-alpha.6

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.