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examples/basic-app/app/realtime/chat.ts

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+// ws://<host>/realtime/chat — a broadcast chat room.
+//
+// The whole client side is the framework's realtime runtime (the /chat page just
+// declares `data-room="chat"`). Here we only handle room events.
+import { defineRoom } from "@wrnexus/core";
+
+type ChatIn = { user?: string; text?: string };
+
+export default defineRoom({
+  onConnect(client) {
+    // Tell everyone else someone joined (the joiner sees the status badge).
+    client.broadcast({ type: "system", text: "A user joined", online: client.room.count() });
+  },
+
+  onMessage(client, msg: ChatIn) {
+    const text = String(msg.text ?? "")
+      .slice(0, 500)
+      .trim();
+    if (!text) return;
+    const user = String(msg.user ?? "anon").slice(0, 40) || "anon";
+    // Broadcast to the whole room, including the sender, so everyone stays in sync.
+    client.room.broadcast({ type: "message", user, text });
+  },
+
+  onLeave(client) {
+    client.broadcast({ type: "system", text: "A user left", online: client.room.count() - 1 });
+  },
+});