[FpUser]

>"Where components differ from microservices is that a component's interface is simply a collection of functions"

Is this a "collection of functions" or "collection of function declarations"? If you want to communicate concepts this is not the best example. And for either case many languages already have the solutions.

[logarhythm]

Technically, a Polylith interface is a collection of "pass-through" functions, each of which delegate their function call to an "implementation" function within the component.

I agree with you that many languages have syntax to support building interfaces. However, I've yet to come across one that offers all the benefits of Polylith's approach with components.