Simplify further.

client/peer.js

@@ -2,8 +2,6 @@ function errorHandler(error) {
     console.log(error);
 }
 
-
-
 export function createPeer(peerExchange, peerConnectionConfig) {
     const conn = new RTCPeerConnection(peerConnectionConfig);
 

client/webrtc.js

@@ -21,31 +21,21 @@ function pageReady() {
     setup();
 }
 
-function getUserMediaSuccess(stream) {
-    localStream = stream;
-    localVideo.srcObject = stream;
-}
-
 function setup() {
     peerConnection = createPeer(serverConnection, peerConnectionConfig);
 
     peerConnection.addEventListener('addstream', gotRemoteStream);
 
-    if(navigator.mediaDevices.getUserMedia) {
     var constraints = {
         video: true,
         audio: true,
     };
 
     navigator.mediaDevices.getUserMedia(constraints)
-        .then(getUserMediaSuccess)
-        .then(() => {
-            peerConnection.addStream(localStream);
-        })
-        .catch(errorHandler);
-    } else {
-        alert('Your browser does not support getUserMedia API');
-    }
+    .then(stream => {
+        localVideo.srcObject = stream;
+        peerConnection.addStream(stream);
+    });
 
     peerConnection.addEventListener('datachannel', function(dataChannel) {
         dataChannel.channel.send('Hello there, I got your signal');