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docs: Add prominent link to svelte/reactivity from state #16220

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6 changes: 6 additions & 0 deletions documentation/docs/02-runes/02-$state.md
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Expand Up @@ -63,6 +63,12 @@ let { done, text } = todos[0];
todos[0].done = !todos[0].done;
```

### State for Collections

Arrays aren't the only structure you might want to use when setting reactive state for a collection of items. The temptation is to reach for Javascript built-in classes like `Set`, `Map`, `URL` and wrap them in `state()`, but this approach won't work.

Use Svelte's own reactive versions instead. You can import `SvelteSet`, `SvelteMap`, `SvelteURL` and other reactive classes in [`svelte/reactivity`](svelte-reactivity).

### Classes

Class instances are not proxied. Instead, you can use `$state` in class fields (whether public or private), or as the first assignment to a property immediately inside the `constructor`:
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