Update DomSync.ts

Author: maraf

src/Components/Web.JS/src/Rendering/DomMerging/DomSync.ts

@@ -309,7 +309,7 @@ function domNodeComparer(a: Node, b: Node): UpdateCost {
       }
 
       // Always treat "preloads" as new elements.
-      if ((b as Element).tagName === 'LINK' && (b as Element).attributes.getNamedItem('rel')?.value === 'preload') {
+      if (isPreloadElement(a as Element) || isPreloadElement(b as Element)) {
         return UpdateCost.Infinite;
       }
 
@@ -324,6 +324,10 @@ function domNodeComparer(a: Node, b: Node): UpdateCost {
   }
 }
 
+function isPreloadElement(el: Element): bool {
+  return el.tagName === 'LINK' && el.attributes.getNamedItem('rel')?.value === 'preload';
+}
+
 function upgradeComponentCommentsToLogicalRootComments(root: Node): ComponentDescriptor[] {
   const serverDescriptors = discoverComponents(root, 'server') as ServerComponentDescriptor[];
   const webAssemblyDescriptors = discoverComponents(root, 'webassembly') as WebAssemblyComponentDescriptor[];