From one perspective types and methods aren't universal, but data is, because once information arrives over the wire you aren't even initially sure if it is wha

From one perspective types and methods aren't universal, but data is, because once information arrives over the wire you aren't even initially sure if it is what you think it is. However, when backend and frontend code exists in the same context for analysis, aren't there enough certainties to know the space of possibilities for what you're going to receive? How much uncertainty precludes the useful sharing of types and methods?