fix TODO

packages/svelte/src/compiler/phases/3-transform/server/visitors/SvelteElement.js

@@ -1,12 +1,12 @@
 /** @import { Location } from 'locate-character' */
-/** @import { BlockStatement, Expression } from 'estree' */
+/** @import { BlockStatement, Expression, Statement } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { dev, locator } from '../../../../state.js';
 import * as b from '#compiler/builders';
 import { determine_namespace_for_children } from '../../utils.js';
 import { build_element_attributes } from './shared/element.js';
-import { build_template, PromiseOptimiser } from './shared/utils.js';
+import { build_template, call_child_renderer, PromiseOptimiser } from './shared/utils.js';
 
 /**
  * @param {AST.SvelteElement} node
@@ -37,7 +37,6 @@ export function SvelteElement(node, context) {
 		init: []
 	};
 
-	// TODO use this
 	const optimiser = new PromiseOptimiser();
 
 	build_element_attributes(node, { ...context, state }, optimiser.transform);
@@ -60,18 +59,23 @@ export function SvelteElement(node, context) {
 	const attributes = b.block([...state.init, ...build_template(state.template)]);
 	const children = /** @type {BlockStatement} */ (context.visit(node.fragment, state));
 
-	context.state.template.push(
-		b.stmt(
-			b.call(
-				'$.element',
-				b.id('$$renderer'),
-				tag,
-				attributes.body.length > 0 && b.thunk(attributes),
-				children.body.length > 0 && b.thunk(children)
-			)
+	/** @type {Statement} */
+	let statement = b.stmt(
+		b.call(
+			'$.element',
+			b.id('$$renderer'),
+			tag,
+			attributes.body.length > 0 && b.thunk(attributes),
+			children.body.length > 0 && b.thunk(children)
 		)
 	);
 
+	if (optimiser.expressions.length > 0) {
+		statement = call_child_renderer(b.block([optimiser.apply(), statement]), true);
+	}
+
+	context.state.template.push(statement);
+
 	if (dev) {
 		context.state.template.push(b.stmt(b.call('$.pop_element')));
 	}