SwiftUI is a user interface toolkit that lets us design apps in a declarative way. That’s a fancy way of saying that we tell SwiftUI how we want our UI to look and work, and it figures out how to make that happen as the user interacts with it.

Imperative UI causes all sorts of problems, most of which revolve around state, which is another fancy term meaning “values we store in our code”. We need to track what state our code is in, and make sure our user interface correctly reflects that state.

In a declarative language like Svelte's HTMLx, you're not writing a program so much as describing a graph.

detach, as an api, should be declarative (ensure the node is detached) instead of imperative (detach the node), allowing it to be called multiple times by performing a noop if the node is already detached. This way, it won't matter if the node is removed from the DOM from outside of svelte.