Update client-channel.js

Author: benhatsor

worker/client-channel.js

@@ -153,6 +153,7 @@ let enableDevLogs = false;
 workerChannel.addEventListener('message', (event) => {
 
   if (event.data.type === 'enableDevLogs') enableDevLogs = true;
+  if (event.data.type === 'hello') workerChannel.postMessage('hello!');
 
 });