Widget.status

Widget.status.value; // "connecting" | "connected" | "disconnected"
Widget.status.onChange(handler); // returns the function to unsubscribe

Widget.status gives the connection with Streamer.bot. value is the current state. onChange calls the handler right away with the current state and then on every change. “disconnected” takes a while to arrive (15 seconds by default, status.graceSeconds in the manifest), so it does not flicker on stream.

Widget.status.onChange((state) => {
  Widget.dom.text(app, state === "connected" ? "" : "Connecting…");
});