perf: convert empty text nodes to comments

Author: shirotech

src/runtime/internal/dom.ts

@@ -54,7 +54,7 @@ export function space() {
 }
 
 export function empty() {
-	return text('');
+	return document.createComment('');
 }
 
 export function listen(node: EventTarget, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions) {

test/runtime/samples/raw-mustache-inside-head/_config.js

@@ -3,14 +3,14 @@ export default {
 		const btn = target.querySelector("button");
 		const clickEvent = new window.MouseEvent("click");
 
-		assert.equal(window.document.head.innerHTML.includes('<style>body { color: blue; }</style><style>body { color: green; }</style>'), true);
+		assert.equal(window.document.head.innerHTML.includes('<style>body { color: blue; }</style><!----><style>body { color: green; }</style>'), true);
 
 		await btn.dispatchEvent(clickEvent);
 
-		assert.equal(window.document.head.innerHTML.includes('<style>body { color: red; }</style><style>body { color: green; }</style>'), true);
+		assert.equal(window.document.head.innerHTML.includes('<style>body { color: red; }</style><!----><style>body { color: green; }</style>'), true);
 
 		await btn.dispatchEvent(clickEvent);
 
-		assert.equal(window.document.head.innerHTML.includes('<style>body { color: blue; }</style><style>body { color: green; }</style>'), true);
+		assert.equal(window.document.head.innerHTML.includes('<style>body { color: blue; }</style><!----><style>body { color: green; }</style>'), true);
 	},
 };