Describe the problem

As written in the svelte doc, variable declared with $derived are not converted to deeply reactive proxies:
https://svelte.dev/docs/svelte/$derived#Deriveds-and-reactivity

The only way there currently seems to be is using $state to create the derived variable and $effect to reflect the changes.

related discussion: #16187

Describe the proposed solution

I want something that allows me to natively do that.

maybe something like

const thisIsDeeplyReactive = $derived($state(source));

Importance

nice to have