Deriving interfaces from classes in TypeScript – Icicles of thought

DRANK

Most object oriented programming languages encourage the pattern of Programming to an interface. TypeScript supports this of course, you can create one or more interfaces, and then define classes (or factories) that generate instances of this interface.However, as the linked article above points out, programming to an interface is sometimes overused when the programmer anticipates the possibility of multiple concrete implementations in future although there may exist just one at the time of implementation.But, until these multiple implementations are actually required, these single-implementation interfaces continue to increase maintenance overhead, because every time we need to introduce a new member, we need to modify two places. Sure, the tooling helps with this but it still not ideal.Also, relying on just the concrete implementation is not ideal because TypeScript compiler service doesn’t yet have a good mechanism to bulk-replace all usage of a concrete implementation with the co…