Function isToHaveNth

packages/expect/src/__tests__/spyMatchers.test.ts:201–205

(
    calledWith: string,
  )

  'toHaveBeenCalledWith',
] as const)('%s', calledWith => {
  function isToHaveNth(
    calledWith: string,
  ): calledWith is 'toHaveBeenNthCalledWith' {
    return calledWith === 'toHaveBeenNthCalledWith';
  }

  test('works only on spies or jest.fn', () => {
    const fn = function fn() {};