From 958bfba66c339d388487e7131402959c89db7553 Mon Sep 17 00:00:00 2001
From: hackademix <giorgio@maone.net>
Date: Tue, 1 Oct 2019 22:46:43 +0200
Subject: [PATCH] SyncMessage support for asynchronous listeners.

---
 src/lib/SyncMessage.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/lib/SyncMessage.js b/src/lib/SyncMessage.js
index b9e5006..2f06d3e 100644
--- a/src/lib/SyncMessage.js
+++ b/src/lib/SyncMessage.js
@@ -82,10 +82,9 @@
             console.error(e, "Processing message %o from %o", msg, sender);
           }
         }
-        return {
-          redirectUrl: `data:application/json,${JSON.stringify(result)}`
-        };
+        return result instanceof Promise ? (async () => ret(await result)) : ret(result);
       };
+      let ret = r => ({redirectUrl:  `data:application/json,${JSON.stringify(r)}`})
 
       let listeners = new Set();
       browser.runtime.onSyncMessage = {