Drab: remote controlled frontend framework for Phoenix

Hey Again.
I am trying to create a channel via Drab. I think I am doing it right?

On the frontend I call
ch = Drab.socket.channel(“user:test”);
ch.join();
but Chrome says “Uncaught ReferenceError: Drab is not defined”

I have Drab Client run setup after my app.js as per docs.
<%= Drab.Client.run(@conn) %>

Do I need to do something else to get the user to join a channel?