using Jasmines spyon upon a private method

Question

is it possible to use Jasmine unit testing framework\'s spyon method upon a classes private methods?

The documentation gives this example but can this be flexivble for a

Answer 1

In my case (Typescript):

jest.spyOn(authService, 'isTokenActual')

OR with mocked result:

jest.spyOn(authService, 'isTokenActual').mockImplementation(() => {
  return false;
});