[Feature]: support type inference for function parameters expect(someFunction).toBeCalledWith()

[royhadad]

🚀 Feature Proposal

When using the following code:

expect(someFunction).toBeCalledWith()

The type expected as arguments for toBeCalledWith is any[]
This can be overridden by passing a type argument:

expect(someFunction).toBeCalledWith<Parameters<someFunction>>()

My proposal is to have it inferred automatically by default.
https://www.typescriptlang.org/docs/handbook/utility-types.html#parameterstype

Similar methods should also be updated (e.g. toHaveBeenCalledWith, lastCalledWith)

Motivation

When using toBeCalledWith, users will get instant feedback and auto-completion for the arguments passed.

Example

No response

Pitch

It will improve the DX of using jest.

[SimenB]

@mrazauskas can we do something clever here?

[mrazauskas]

Good idea. I think it should be possible to type expected args in a similar fashion how propertyMatchers are typed here:

https://github.com/facebook/jest/blob/e703e6ed1861595d56e25a764642da5a32b32c5a/packages/jest-snapshot/src/types.ts#L38-L39

[royhadad]

@mrazauskas @SimenB
I just opened a pull request to add this behavior, any feedback?

[github-actions]

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