svelte/test/runtime/samples/set-in-onstate-dedupes-renders/main.html

<script>
	import { beforeUpdate } from 'svelte';

	import Widget from './Widget.html';

	export let foo = { x: 1 };
	export let bar = { x: 1 };

	beforeUpdate(() => {
		bar = foo;
	});
</script>

<Widget foo='{foo}' bar='{bar}'/>