Avoid upgrading template if no hostProps, for better perf.

Polymer · Apr 10, 2019 · 65a5b48 · 65a5b48
1 parent b7c73bd
commit 65a5b48
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/lib/utils/templatize.js b/lib/utils/templatize.js
@@ -364,7 +364,11 @@ function createTemplatizerClass(template, templateInfo, options) {
  */
 function addPropagateEffects(template, templateInfo, options) {
   let userForwardHostProp = options.forwardHostProp;
-  if (userForwardHostProp) {
+  const hasHostProps = templateInfo.hasHostProps ||
+    (templateInfo.hasHostProps = 
+      Boolean(templateInfo.hostProps && 
+        Object.keys(templateInfo.hostProps).length));
+  if (userForwardHostProp && hasHostProps) {
     // Provide data API and property effects on memoized template class
     let klass = templateInfo.templatizeTemplateClass;
     if (!klass) {