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So...it's an event bus?

Yep. Who needs explicit coupling when you can silently couple interfaces?

Could you still have explicit coupling? For example by keeping definition of given message in the same module where the sender is?

> A guard that represent central point of control in your application.

Yeah, it looks like a pubsub system. The use of the word "module" here is misleading. It's not about ecmascript modules.