How to use the expect.isSpy function in expect

function test_spies() {
  // Spy
  const spy = expect.createSpy<(a: number) => number>()
  expect.isSpy(spy);
  const otherSpy = expect.spyOn({}, "test");
  expect.restoreSpies();

  spy.andCall(() => {});
  spy.andCallThrough();
  spy.andReturn(1);
  spy.andThrow(new Error("test"));
  spy.restore();

  spy(1);
  spy.calls[0].arguments;
  spy.calls[0].context;

  expect(spy).toBe(spy);
  expect(spy).toEqual(spy);
  expect(spy).toExist();

resetSpies: () => Object.values(mockCanvasContext).forEach((spy) => {
    if (isSpy(spy)) {
      spy.reset();
    }
  }),
};

resetSpies: () => Object.values(mockCanvasContext).forEach((spy) => {
    if (isSpy(spy)) {
      spy.reset();
    }
  }),
};