docs: fix one TypeScript example in Mock Functions documentation

[mrazauskas]

Summary

Just noticed that one of the examples in Mock Functions documentation needs to be typed. Here scalar is of type any, because of missing annotation:

const mockFn = jest.fn(scalar => 42 + scalar);

Must be:

const mockFn = jest.fn((scalar: number) => 42 + scalar);

Test plan

Green CI.

[SimenB]

Is it possible for scalar to be unknown instead of any?

[mrazauskas]

Is it possible for scalar to be unknown instead of any?

That’s good question. In a way, scalar implicitly has any and that type is respected, but why TS does not complain with "implicitly has an 'any' type"? I will look at this.

[SimenB]

yeah, if TS would complain about implicit any I'd care less. Ideally it'd be implicit unknown, tho 😀

[github-actions]

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