Jest compatibility API: mockFn.withImplementation API

[trivikr]

Clear and concise description of the problem

Jest added mockFn.withImplementation API in v29.1.0

• PR: feat(@jest/mock): Add withImplementation jestjs/jest#13281
• Docs: https://jestjs.io/docs/mock-function-api#mockfnwithimplementationfn-callback

It accepts a function which should be temporarily used as the implementation of the mock while the callback is being executed.

Suggested solution

Add this API to vitest, if maintainers think it would be helpful to it's users.

Alternative

Document how mockImplementation or mockImplementationOnce can be used in these use cases

Additional context

This issue was noticed while writing vitest-codemod tests for mock API
trivikr/vitest-codemod#80

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[mysteryven]

I'd like to take this PR😀

[obadakhalili]

I'd like to take this PR

I'm sorry @mysteryven but I have already opened a PR for this. I probably should have commented before doing so, but it is my first contribution and I didn't want to make any promises that I might not be able to keep 😅.

Again, sorry for the confusion.

[trivikr]

I'd like to take this PR😀

@mysteryven Thank you for your interest.

I'd created multiple issues with vitest.
You can take #2831 if you're interested, for example.

Maintainers haven't added enhancement label to it yet, but I think they would looking at other compatibility feature requests.

[mysteryven]

Again, sorry for the confusion.

Never mind ! 😛 @obadakhalili