Collect number of assets served from browser cache

sitespeedio · Oct 12, 2023 · 97fca1e · 97fca1e
1 parent 99c1c3b
commit 97fca1e
Showing 1 changed file with 17 additions and 4 deletions.
diff --git a/browserscripts/pageinfo/resources.js b/browserscripts/pageinfo/resources.js
@@ -1,14 +1,27 @@
-(function() {
+(function () {
   const resources = window.performance.getEntriesByType('resource');
 
   let resourceDuration = 0;
+  let servedFromCache = 0;
+  let servedFromCacheSupported = false;
   for (let i = 0; i < resources.length; i++) {
     resourceDuration += resources[i].duration;
+    if (resources[i].deliveryType !== undefined) {
+      servedFromCacheSupported = true;
+      if (resources[i].deliveryType === 'cache') {
+        servedFromCache++;
+      }
+    }
   }
 
-  return {
+  const info = {
     count: Number(resources.length),
-    duration: Number(resourceDuration)
+    duration: Number(resourceDuration),
+  };
+
+  if (servedFromCacheSupported === true) {   
+    info.servedFromCache = Number(servedFromCache);
   }
-})();
 
+  return info;
+})();