From 18aad1e771b425577a954efd7a758a9d75486964 Mon Sep 17 00:00:00 2001
From: Wang Guan <momocraft@gmail.com>
Date: Mon, 19 Feb 2024 00:30:41 +0900
Subject: [PATCH 1/2] parent-namespace: change inline Adapter-like to
 file-private class

---
 lib/parent-namespace.ts | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/lib/parent-namespace.ts b/lib/parent-namespace.ts
index f44b052e3d..07ff881f09 100644
--- a/lib/parent-namespace.ts
+++ b/lib/parent-namespace.ts
@@ -6,6 +6,7 @@ import type {
   DefaultEventsMap,
   EventNamesWithoutAck,
 } from "./typed-events";
+import {Adapter} from "socket.io-adapter";
 import type { BroadcastOptions } from "socket.io-adapter";
 import debugModule from "debug";
 
@@ -33,7 +34,7 @@ export class ParentNamespace<
   SocketData = any
 > extends Namespace<ListenEvents, EmitEvents, ServerSideEvents, SocketData> {
   private static count: number = 0;
-  private children: Set<
+  private readonly children: Set<
     Namespace<ListenEvents, EmitEvents, ServerSideEvents, SocketData>
   > = new Set();
 
@@ -47,13 +48,7 @@ export class ParentNamespace<
    * @private
    */
   _initAdapter(): void {
-    const broadcast = (packet: any, opts: BroadcastOptions) => {
-      this.children.forEach((nsp) => {
-        nsp.adapter.broadcast(packet, opts);
-      });
-    };
-    // @ts-ignore FIXME is there a way to declare an inner class in TypeScript?
-    this.adapter = { broadcast };
+    this.adapter = new ParentBroadcastAdapter(this, this.children);
   }
 
   public emit<Ev extends EventNamesWithoutAck<EmitEvents>>(
@@ -112,3 +107,19 @@ export class ParentNamespace<
     throw new Error("fetchSockets() is not supported on parent namespaces");
   }
 }
+
+/**
+ * A dummy adapter that only supports broadcasting to child (concrete) namespaces.
+ * @private file
+ */
+class ParentBroadcastAdapter extends Adapter {
+  constructor(parentNsp: any, private readonly children: Set<Namespace>) {
+    super(parentNsp);
+  }
+
+  broadcast(packet: any, opts: BroadcastOptions) {
+    this.children.forEach((nsp) => {
+      nsp.adapter.broadcast(packet, opts);
+    });
+  };
+}

From 9269b70eef3870ad2047e057095222a684bdc1c5 Mon Sep 17 00:00:00 2001
From: Wang Guan <momocraft@gmail.com>
Date: Mon, 19 Feb 2024 23:35:10 +0900
Subject: [PATCH 2/2] make prettier happy

---
 lib/parent-namespace.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/parent-namespace.ts b/lib/parent-namespace.ts
index 07ff881f09..63e7ce56e2 100644
--- a/lib/parent-namespace.ts
+++ b/lib/parent-namespace.ts
@@ -6,7 +6,7 @@ import type {
   DefaultEventsMap,
   EventNamesWithoutAck,
 } from "./typed-events";
-import {Adapter} from "socket.io-adapter";
+import { Adapter } from "socket.io-adapter";
 import type { BroadcastOptions } from "socket.io-adapter";
 import debugModule from "debug";
 
@@ -121,5 +121,5 @@ class ParentBroadcastAdapter extends Adapter {
     this.children.forEach((nsp) => {
       nsp.adapter.broadcast(packet, opts);
     });
-  };
+  }
 }