feat: add the elapsed time to events for debugging (#5868)

* feat: add the elapsed time to events for debugging * naming
prebid · Nov 2, 2020 · d19f4ca · d19f4ca
1 parent 39df31f
commit d19f4ca
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diff --git a/src/events.js b/src/events.js
@@ -44,7 +44,8 @@ module.exports = (function () {
     eventsFired.push({
       eventType: eventString,
       args: eventPayload,
-      id: key
+      id: key,
+      elapsedTime: utils.getPerformanceNow(),
     });
 
     /** Push each specific callback to the `callbacks` array.

diff --git a/src/utils.js b/src/utils.js
@@ -727,6 +727,14 @@ export function timestamp() {
   return new Date().getTime();
 }
 
+/**
+ * The returned value represents the time elapsed since the time origin. @see https://developer.mozilla.org/en-US/docs/Web/API/Performance/now
+ * @returns {number}
+ */
+export function getPerformanceNow() {
+  return (window.performance && window.performance.now && window.performance.now()) || 0;
+}
+
 /**
  * When the deviceAccess flag config option is false, no cookies should be read or set
  * @returns {boolean}