tests for U-nodes

Author: manuel3108

packages/svelte/tests/print/samples/use-directive/input.svelte

@@ -0,0 +1,9 @@
+<script lang="ts">
+	import type { Action } from 'svelte/action';
+
+	const myaction: Action = (node, data) => {
+		// ...
+	};
+</script>
+
+<div use:myaction={data}>...</div>

packages/svelte/tests/print/samples/use-directive/output.svelte

@@ -0,0 +1,9 @@
+<script lang="ts">
+	import type { Action } from 'svelte/action';
+
+	const myaction: Action = (node, data) => {
+		// ...
+	};
+</script>
+
+<div use:myaction={data}>...</div>