interface User {
  name: string
  createdAt: Date
}

it('test case', () => {
  let json = `{
    "name": "Denis",
    "createdAt": "2019-02-14T11:10:06.788Z"
  }`;
  let user: User = JSON.parse(json);
  expect(user.name).toEqual("Denis");
  expect(user.createdAt).toEqual("2019-02-14T11:10:06.788Z"); // It works, even if type of createdAt is Date, but in runtime it's string.
  expect(user.createdAt).toEqual(new Date(Date.UTC(2019, 1, 14, 11, 10, 6, 788))); // ERROR: Expected date but received string.
})