feat: emit closed

packages/system/src/connection.ts

@@ -51,6 +51,7 @@ interface ConnectionEvents {
   connected: (wasReconnect: boolean) => void;
   event: (sub: string, e: TaggedNostrEvent) => void;
   eose: (sub: string) => void;
+  closed: (sub: string, reason: string) => void;
   disconnect: (code: number) => void;
   auth: (challenge: string, relay: string, cb: (ev: NostrEvent) => void) => void;
   notice: (msg: string) => void;
@@ -252,6 +253,10 @@ export class Connection extends EventEmitter<ConnectionEvents> {
           this.#log(`NOTICE: ${msg[1]}`);
           break;
         }
+        case "CLOSED": {
+          this.emit("closed", msg[1] as string, msg[2] as string);
+          this.#log(`CLOSED: ${msg.slice(1)}`);
+        }
         default: {
           this.#log(`Unknown tag: ${tag}`);
           break;