refactor: Avoid reparsing the HTML template

src/prerender.ts

@@ -150,11 +150,12 @@ export function PrerenderPlugin({
 			globalThis.self = globalThis;
 
 			// Grab the generated HTML file, which we'll use as a template:
-			const tpl = (bundle["index.html"] as OutputAsset).source as string;
-			let htmlDoc = parse(tpl);
+			const bareTemplate = parse(
+				(bundle["index.html"] as OutputAsset).source as string,
+			);
 
-			// Create a tmp dir to allow importing & consuming the built modules, before
-			// Rollup writes them to the disk
+			// Create a tmp dir to allow importing & consuming the built modules,
+			// before Rollup writes them to the disk
 			const tmpDir = await fs.mkdtemp(
 				path.join(os.tmpdir(), "headless-prerender-"),
 			);
@@ -221,7 +222,7 @@ export function PrerenderPlugin({
 				if (result == null) continue;
 
 				// Reset HTML doc & head data
-				htmlDoc = parse(tpl);
+				const htmlDoc = bareTemplate;
 				head = { lang: "", title: "", elements: new Set() };
 
 				// Add any discovered links to the list of routes to pre-render: