From ef9ecfbcfe8a5b1e8b1c601c48afa065cbdab614 Mon Sep 17 00:00:00 2001
From: Kirill Fomichev <fanatid@ya.ru>
Date: Wed, 4 Sep 2019 23:01:07 +0300
Subject: perf_hooks: ignore duplicated entries in observer

PerformanceObserver should add to observing only unique entry types.

PR-URL: https://github.com/nodejs/node/pull/29442
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
---
 lib/perf_hooks.js | 1 +
 1 file changed, 1 insertion(+)

(limited to 'lib/perf_hooks.js')

diff --git a/lib/perf_hooks.js b/lib/perf_hooks.js
index 1bf635790e..12909b047c 100644
--- a/lib/perf_hooks.js
+++ b/lib/perf_hooks.js
@@ -354,6 +354,7 @@ class PerformanceObserver extends AsyncResource {
     for (var n = 0; n < entryTypes.length; n++) {
       const entryType = entryTypes[n];
       const list = getObserversList(entryType);
+      if (this[kTypes][entryType]) continue;
       const item = { obs: this };
       this[kTypes][entryType] = item;
       L.append(list, item);
-- 
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