fix!(spy): simplify mock function generic types and align with jest

[hi-ogawa]

Description

Closes #4723

I started with a mostly straight-forward typing update by following jestjs/jest#12489. I will consider the implication of this change in details later.

todo

• user-land workaround 4723#issuecomment-1863740082
• remove deprecated SpyInstance?
• should vi.fn default to (...args: any[]) => any or (...args: unknown[]) => unknown?
• more type tests
• doc / migration guide

references

• refactor(jest-mock)!: simplify usage of jest.fn generic type arguments jestjs/jest#12489
• refactor(jest-mock)!: rework Mocked* utility types jestjs/jest#13123
• refactor(jest-mock)!: change the default jest.mocked helper’s behaviour to deep mocked jestjs/jest#13125
• feat(@jest/globals, jest-mock): add jest.Spied* utility types jestjs/jest#13440

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[netlify]

✅ Deploy Preview for fastidious-cascaron-4ded94 canceled.

Name	Link
🔨 Latest commit	7b59e10
🔍 Latest deploy log	https://app.netlify.com/sites/fastidious-cascaron-4ded94/deploys/66275fc6f2c2e800085d1d6c

[sheremet-va]

I don't think we should change base types yet. Instead, I propose defining a namespace with new mock types like vite does with Rollup namespace (naming can be discussed):

// mock-types.ts
export type MockContext<T extends Procedure> = {}

// spy.ts
import type * as Mocks from './mock-types.ts'
export type { Mocks }

// test.ts
import type { Mocks } from 'vitest'
const fn: Mocks.Spy<() => void> = vi.fn()

[hi-ogawa]

SpyInstance is deprecated, so can we remove it in v2 with this change?

vitest/packages/spy/src/index.ts

Lines 111 to 114 in c17bac0

	/**
	* @deprecated Use MockInstance<A, R> instead
	*/
	export interface SpyInstance<TArgs extends any[] = any[], TReturns = any> extends MockInstance<(...args: TArgs) => TReturns> {}

[sheremet-va]

SpyInstance is deprecated, so can we remove it in v2 with this change?

Sure, let's remove it.