From ae3284d46054b189e143b405e1bfc6c09643bf77 Mon Sep 17 00:00:00 2001
From: abishek-srinivasan <abishek.srinivasan@freshworks.com>
Date: Thu, 11 Nov 2021 16:50:05 +0530
Subject: [PATCH] Use existing root.pubSub when present (#213)

This means that loading `pubsub-js` more than once in the same environment will work as the author expects. A warning will be output on the console to make the developer aware of the duplication.
---
 src/pubsub.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/pubsub.js b/src/pubsub.js
index 16e1730..29f73bc 100644
--- a/src/pubsub.js
+++ b/src/pubsub.js
@@ -9,8 +9,14 @@
     'use strict';
 
     var PubSub = {};
-    root.PubSub = PubSub;
-    factory(PubSub);
+
+    if (root.PubSub) {
+        PubSub = root.PubSub;
+        console.warn("PubSub already loaded, using existing version");
+    } else {
+        root.PubSub = PubSub;
+        factory(PubSub);
+    }
     // CommonJS and Node.js module support
     if (typeof exports === 'object'){
         if (module !== undefined && module.exports) {