From b445a1f43ac5fb6e7a3e2cb16abc317cfffcd290 Mon Sep 17 00:00:00 2001
From: Adhiraj <adhirajsingh1001@gmail.com>
Date: Thu, 28 May 2020 18:46:03 +0530
Subject: [PATCH] Compatibility with older versions of Node

---
 WhatsAppWeb.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WhatsAppWeb.js b/WhatsAppWeb.js
index d24bafa..4aa3e3b 100644
--- a/WhatsAppWeb.js
+++ b/WhatsAppWeb.js
@@ -113,7 +113,7 @@ class WhatsAppWeb {
                 participant: json.participant,
                 timestamp: new Date (json.t*1000),
                 ids: ids,
-                type: ackTypes[json.ack-1] ?? "unknown (" + json.ack + ")"
+                type: ackTypes[json.ack-1] || "unknown (" + json.ack + ")"
             }
             callback (data)
         }