TypeScript is an incredible language in general. The fact that Functions are Objects that can have properties/methods is supremely undervalued. Are there other languages that do this so nicely? It's the perfect blend of OO and functional. Programming is mostly about gradually figuring out the right design I find. JS/TS let's me evolve things naturally without big rewrites. function foo() {} function bar() {} function…
One of the canonical examples would be a net/http: A handler can both be a struct (or any other type really) that implements a serve method, or it can be a handler function that calls itself to satisfy the interface.
In Clojure you would achieve the thing you describe by attaching metadata on your function var. It being a Lisp, it also has macros so you can pretty much do anything.
Speaking of macros:
Clojure also implements CSP channels with macros in core/async, inspired by Go.
Channels are a very powerful construct that you might like a lot. With channels you can completely avoid the function coloring problem (callbacks, promises, async/await). Perhaps most importantly they decouple execution from communication.
So going back to your example, your commands could be producers that send their results on channels. They don't need to know what consumes w/e they make, nor do they need to hold on to it, mutate something, or call something directly.
Good analogies would be buses on motherboards, routers and switches in networks, conveyor belts, message queues in distributed systems and so on.