diff --git a/.eslintrc b/.eslintrc
index 98f9236ae..9bcdb4688 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,5 +1,6 @@
 {
   "extends": [
-    "eslint-config-egg/typescript"
+    "eslint-config-egg/typescript",
+    "eslint-config-egg/lib/rules/enforce-node-prefix"
   ]
 }
diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index 60edbce24..ae12488c4 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -12,6 +12,6 @@ jobs:
     uses: node-modules/github-actions/.github/workflows/node-test.yml@master
     with:
       os: 'ubuntu-latest, macos-latest, windows-latest'
-      version: '18.19.0, 18, 20, 22'
+      version: '18.19.0, 18, 20, 22, 23'
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/example/extend/Request.ts b/example/extend/Request.ts
new file mode 100644
index 000000000..653175d3f
--- /dev/null
+++ b/example/extend/Request.ts
@@ -0,0 +1,23 @@
+import { Request } from '../../src/index.js';
+
+const HOST = Symbol('request host');
+
+export class CustomRequest extends Request {
+  get host(): string {
+    let host = this[HOST] as string;
+    if (host) {
+      return host;
+    }
+
+    if (this.app.proxy) {
+      host = '127.0.0.1';
+    }
+    const rawHost = host || this.get('host');
+    if (!rawHost) {
+      this[HOST] = '';
+      return '';
+    }
+    this[HOST] = rawHost.split(/\s*,\s*/)[0];
+    return host;
+  }
+}
diff --git a/example/helloworld.cjs b/example/helloworld.cjs
index 7eb5bd126..e20c998cb 100644
--- a/example/helloworld.cjs
+++ b/example/helloworld.cjs
@@ -1,5 +1,5 @@
 // eslint-disable-next-line @typescript-eslint/no-var-requires
-const { Application } = require('../dist/commonjs/index.js');
+const { Application } = require('..');
 
 const app = new Application();
 
diff --git a/example/helloworld.mjs b/example/helloworld.mjs
index d805b3373..2efc9a3e9 100644
--- a/example/helloworld.mjs
+++ b/example/helloworld.mjs
@@ -1,4 +1,4 @@
-import { Application } from '../dist/esm/index.js';
+import { Application } from '..';
 
 const app = new Application();
 
diff --git a/src/application.ts b/src/application.ts
index d069bdb9b..12b770c26 100644
--- a/src/application.ts
+++ b/src/application.ts
@@ -17,7 +17,7 @@ import { Response } from './response.js';
 import type { ContextDelegation } from './context.js';
 import type { CustomError, AnyProto } from './types.js';
 
-const debug = debuglog('@eggjs/koa:application');
+const debug = debuglog('@eggjs/koa/application');
 
 export type ProtoImplClass<T = object> = new(...args: any[]) => T;
 export type Next = () => Promise<void>;
@@ -29,6 +29,7 @@ export type MiddlewareFunc = _MiddlewareFunc & { _name?: string };
  * Inherits from `Emitter.prototype`.
  */
 export class Application extends Emitter {
+  [key: symbol]: unknown;
   /**
    * Make HttpError available to consumers of the library so that consumers don't
    * have a direct dependency upon `http-errors`
diff --git a/src/context.ts b/src/context.ts
index 7be730311..0d3175b1f 100644
--- a/src/context.ts
+++ b/src/context.ts
@@ -11,6 +11,7 @@ import type { Response } from './response.js';
 import type { CustomError, AnyProto } from './types.js';
 
 export class Context {
+  [key: symbol]: unknown;
   app: Application;
   req: IncomingMessage;
   res: ServerResponse;
diff --git a/src/request.ts b/src/request.ts
index 7bf09df1c..d8929fac5 100644
--- a/src/request.ts
+++ b/src/request.ts
@@ -13,6 +13,7 @@ import type { ContextDelegation } from './context.js';
 import type { Response } from './response.js';
 
 export class Request {
+  [key: symbol]: unknown;
   app: Application;
   req: IncomingMessage;
   res: ServerResponse;
diff --git a/src/response.ts b/src/response.ts
index 345fc35aa..c3581756a 100644
--- a/src/response.ts
+++ b/src/response.ts
@@ -17,6 +17,7 @@ import type { ContextDelegation } from './context.js';
 import type { Request } from './request.js';
 
 export class Response {
+  [key: symbol]: unknown;
   app: Application;
   req: IncomingMessage;
   res: ServerResponse;