Modularize config.

client/config.js

@@ -0,0 +1,6 @@
+export const peerConnectionConfig = {
+    'iceServers': [
+        {'urls': 'stun:stun.services.mozilla.com'},
+        {'urls': 'stun:stun.l.google.com:19302'},
+    ],
+};

client/webrtc.js

@@ -1,3 +1,5 @@
+import { peerConnectionConfig } from './config.js';
+
 var localVideo;
 var localStream;
 var remoteVideo;
@@ -11,13 +13,6 @@ var dataChannelOptions = {
   maxRetransmitTime: 500, // in milliseconds
 };
 
-var peerConnectionConfig = {
-    'iceServers': [
-        {'urls': 'stun:stun.services.mozilla.com'},
-        {'urls': 'stun:stun.l.google.com:19302'},
-    ]
-};
-
 function pageReady() {
     document.querySelector("button#start")
     .addEventListener("click", start);