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Not sure how this is any more natural than JSX/HTML. It looks much messier and harder to follow.

Also I’d like to see how they handle mount/unmount logic like event listeners.

No shadow dom, so no mount/unmount logic ! A whole new DOM sub-tree is re-created each time a value change.

There is an example in the tutorial about how state are handled [1]. [1] https://vanjs.org/tutorial#state-binding

So how do you clean up global event listeners, clear intervals and timeouts, etc when a component unmounts?

s/shadow/virtual/