svelte/test/runtime/samples/computed-state-object/main.html

<p>a: {a}</p>
<p>x: {x}</p>
<p>y: {y}</p>
<p>z: {z}</p>

<script>
	export default {
		computed: {
			y: state => state.x * 2,
			z: state => state.y * 2,
			x: ({ a }) => a * 2
		}
	};
</script>