From 2dd404db0fb8d945613a38ac35eba7a70dcfaad2 Mon Sep 17 00:00:00 2001
From: Kris Maglione <maglione.k@gmail.com>
Date: Mon, 10 Oct 2016 14:02:56 -0700
Subject: [PATCH] Add async function version of message listener example.

---
 README.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 0565c72..b7628e4 100644
--- a/README.md
+++ b/README.md
@@ -158,4 +158,17 @@ browser.runtime.onMessage.addListener(msg => {
 });
 ```
 
+or:
+
+```javascript
+browser.runtime.onMessage.addListener(async function(msg) {
+  if (msg == "get-ids") {
+    let {idPattern} = await browser.storage.get("idPattern");
+
+    return Array.from(document.querySelectorAll(idPattern),
+                      elem => elem.textContent);
+  }
+});
+```
+
 Or vice versa.