Expose mocks directly with `mockNuxtImport`

Currently, it's possible to mock a Nuxt import:

mockNuxtImport('useStorage', () => {
    return vi.fn()
})

When we want to access this mock in our test, to run an assertion or to change the implementation, we can use vi.hoisted:

const { useStorageMock } = vi.hoisted(() => {
  return {
    useStorageMock: vi.fn()
  }
})

mockNuxtImport('useStorage', () => {
  return useStorageMock
})

// now we can change the implementation of useStorageMock between tests

This is a lot of code just to define and expose a single mock. Would it be possible to make mocking Nuxt imports easier by returning the mocks directly in mockNuxtImport?

I propose something like this:

const useStorageMock = mockNuxtImport('useStorage', () => {
    return vi.fn()
})

// now we can change the implementation of useStorageMock between tests

I'm down to have a look at this if this is possible.

Start at the mockNuxtImport entry point and trace how the mock factory is registered. Check the existing testing utilities and verify that the returned mock can be asserted on and reconfigured between tests; done means the proposed direct-return usage works without vi.hoisted.