docs(examples): bump dependencies for the private messaging example

2026-04-30 03:00:39 -04:00 · 2023-05-03 10:14:49 +02:00
107 changed files with 29879 additions and 8152 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,79 +1,3 @@
-## [4.1.2](https://github.com/socketio/socket.io/compare/4.1.1...4.1.2) (2021-05-17)
-
-
-### Bug Fixes
-
-* **typings:** ensure compatibility with TypeScript 3.x ([0cb6ac9](https://github.com/socketio/socket.io/commit/0cb6ac95b49a27483b6f1b6402fa54b35f82e36f))
-* ensure compatibility with previous versions of the adapter ([a2cf248](https://github.com/socketio/socket.io/commit/a2cf2486c366cb62293101c10520c57f6984a3fc))
-
-
-## [4.1.1](https://github.com/socketio/socket.io/compare/4.1.0...4.1.1) (2021-05-11)
-
-
-### Bug Fixes
-
-* **typings:** properly type server-side events ([b84ed1e](https://github.com/socketio/socket.io/commit/b84ed1e41c9053792caf58974c5de9395bfd509f))
-* **typings:** properly type the adapter attribute ([891b187](https://github.com/socketio/socket.io/commit/891b1870e92d1ec38910f03bb839817e2d6be65a))
-
-
-# [4.1.0](https://github.com/socketio/socket.io/compare/4.0.2...4.1.0) (2021-05-11)
-
-
-### Features
-
-* add support for inter-server communication ([93cce05](https://github.com/socketio/socket.io/commit/93cce05fb3faf91f21fa71212275c776aa161107))
-* notify upon namespace creation ([499c892](https://github.com/socketio/socket.io/commit/499c89250d2db1ab7725ab2b74840e188c267c46))
-* add a "connection_error" event ([7096e98](https://github.com/socketio/engine.io/commit/7096e98a02295a62c8ea2aa56461d4875887092d), from `engine.io`)
-* add the "initial_headers" and "headers" events ([2527543](https://github.com/socketio/engine.io/commit/252754353a0e88eb036ebb3082e9d6a9a5f497db), from `engine.io`)
-
-
-### Performance Improvements
-
-* add support for the "wsPreEncoded" writing option ([dc381b7](https://github.com/socketio/socket.io/commit/dc381b72c6b2f8172001dedd84116122e4cc95b3))
-
-
-## [4.0.2](https://github.com/socketio/socket.io/compare/4.0.1...4.0.2) (2021-05-06)
-
-
-### Bug Fixes
-
-* **typings:** make "engine" attribute public ([b81ce4c](https://github.com/socketio/socket.io/commit/b81ce4c9d0b00666361498e2ba5e0d007d5860b8))
-* properly export the Socket class ([d65b6ee](https://github.com/socketio/socket.io/commit/d65b6ee84c8e91deb61c3c1385eb19afa196a909))
-
-
-## [4.0.1](https://github.com/socketio/socket.io/compare/4.0.0...4.0.1) (2021-03-31)
-
-
-### Bug Fixes
-
-* **typings:** add fallback to untyped event listener ([#3834](https://github.com/socketio/socket.io/issues/3834)) ([a11152f](https://github.com/socketio/socket.io/commit/a11152f42b281df83409313962f60f230239c79e))
-* **typings:** update return type from emit ([#3843](https://github.com/socketio/socket.io/issues/3843)) ([1a72ae4](https://github.com/socketio/socket.io/commit/1a72ae4fe27a14cf60916f991a2c94da91d9e54a))
-
-
-# [4.0.0](https://github.com/socketio/socket.io/compare/3.1.2...4.0.0) (2021-03-10)
-
-
-### Bug Fixes
-
-* make io.to(...) immutable ([ac9e8ca](https://github.com/socketio/socket.io/commit/ac9e8ca6c71e00d4af45ee03f590fe56f3951186))
-
-
-### Features
-
-* add some utility methods ([b25495c](https://github.com/socketio/socket.io/commit/b25495c069031674da08e19aed68922c7c7a0e28))
-* add support for typed events ([#3822](https://github.com/socketio/socket.io/issues/3822)) ([0107510](https://github.com/socketio/socket.io/commit/0107510ba8a0f148c78029d8be8919b350feb633))
-* allow to exclude specific rooms when broadcasting ([#3789](https://github.com/socketio/socket.io/issues/3789)) ([7de2e87](https://github.com/socketio/socket.io/commit/7de2e87e888d849eb2dfc5e362af4c9e86044701))
-* allow to pass an array to io.to(...) ([085d1de](https://github.com/socketio/socket.io/commit/085d1de9df909651de8b313cc6f9f253374b702e))
-
-
-## [3.1.2](https://github.com/socketio/socket.io/compare/3.1.1...3.1.2) (2021-02-26)
-
-
-### Bug Fixes
-
-* ignore packets received after disconnection ([494c64e](https://github.com/socketio/socket.io/commit/494c64e44f645cbd24c645f1186d203789e84af0))
-
-
 ## [3.1.1](https://github.com/socketio/socket.io/compare/3.1.0...3.1.1) (2021-02-03)


--- a/client-dist/socket.io.js
+++ b/client-dist/socket.io.js
--- a/client-dist/socket.io.js.map
+++ b/client-dist/socket.io.js.map
--- a/client-dist/socket.io.min.js
+++ b/client-dist/socket.io.min.js
--- a/client-dist/socket.io.min.js.map
+++ b/client-dist/socket.io.min.js.map
--- a/client-dist/socket.io.msgpack.min.js
+++ b/client-dist/socket.io.msgpack.min.js
--- a/client-dist/socket.io.msgpack.min.js.map
+++ b/client-dist/socket.io.msgpack.min.js.map
--- a/examples/.gitignore
+++ b/examples/.gitignore
@@ -1 +0,0 @@
-package-lock.json
--- a/examples/angular-todomvc/package-lock.json
+++ b/examples/angular-todomvc/package-lock.json
--- a/examples/angular-todomvc/package.json
+++ b/examples/angular-todomvc/package.json
@@ -21,8 +21,8 @@
    "@angular/platform-browser-dynamic": "~11.0.4",
    "@angular/router": "~11.0.4",
    "rxjs": "~6.6.0",
-    "socket.io": "^4.0.0",
-    "socket.io-client": "^4.0.0",
+    "socket.io": "^3.0.4",
+    "socket.io-client": "^3.0.4",
    "tslib": "^2.0.0",
    "zone.js": "~0.10.2"
  },
--- a/examples/angular-todomvc/server.ts
+++ b/examples/angular-todomvc/server.ts
@@ -1,4 +1,4 @@
-import { Server } from "socket.io";
+import { Server, Socket } from "socket.io";

 const io = new Server(8080, {
  cors: {
@@ -15,7 +15,7 @@ interface Todo {

 let todos: Array<Todo> = [];

-io.on("connect", (socket) => {
+io.on("connect", (socket: Socket) => {
    socket.emit("todos", todos);

    // note: we could also create a CRUD (create/read/update/delete) service for the todo list
--- a/examples/basic-crud-application/README.md
+++ b/examples/basic-crud-application/README.md
@@ -1,19 +0,0 @@
-# Basic CRUD application with Socket.IO
-
-Please read the related [guide](https://socket.io/get-started/basic-crud-application/).
-
-## Running the frontend
-
-```
-cd angular-client
-npm install
-npm start
-```
-
-### Running the server
-
-```
-cd server
-npm install
-npm start
-```
--- a/examples/basic-crud-application/angular-client/.browserslistrc
+++ b/examples/basic-crud-application/angular-client/.browserslistrc
@@ -1,17 +0,0 @@
-# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
-# For additional information regarding the format and rule options, please see:
-# https://github.com/browserslist/browserslist#queries
-
-# For the full list of supported browsers by the Angular framework, please see:
-# https://angular.io/guide/browser-support
-
-# You can see what browsers were selected by your queries by running:
-#   npx browserslist
-
-last 1 Chrome version
-last 1 Firefox version
-last 2 Edge major versions
-last 2 Safari major versions
-last 2 iOS major versions
-Firefox ESR
-not IE 11 # Angular supports IE 11 only as an opt-in. To opt-in, remove the 'not' prefix on this line.
--- a/examples/basic-crud-application/angular-client/.editorconfig
+++ b/examples/basic-crud-application/angular-client/.editorconfig
@@ -1,16 +0,0 @@
-# Editor configuration, see https://editorconfig.org
-root = true
-
-[*]
-charset = utf-8
-indent_style = space
-indent_size = 2
-insert_final_newline = true
-trim_trailing_whitespace = true
-
-[*.ts]
-quote_type = single
-
-[*.md]
-max_line_length = off
-trim_trailing_whitespace = false
--- a/examples/basic-crud-application/angular-client/.gitignore
+++ b/examples/basic-crud-application/angular-client/.gitignore
@@ -1,46 +0,0 @@
-# See http://help.github.com/ignore-files/ for more about ignoring files.
-
-# compiled output
-/dist
-/tmp
-/out-tsc
-# Only exists if Bazel was run
-/bazel-out
-
-# dependencies
-/node_modules
-
-# profiling files
-chrome-profiler-events*.json
-speed-measure-plugin*.json
-
-# IDEs and editors
-/.idea
-.project
-.classpath
-.c9/
-*.launch
-.settings/
-*.sublime-workspace
-
-# IDE - VSCode
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-.history/*
-
-# misc
-/.sass-cache
-/connect.lock
-/coverage
-/libpeerconnection.log
-npm-debug.log
-yarn-error.log
-testem.log
-/typings
-
-# System Files
-.DS_Store
-Thumbs.db
--- a/examples/basic-crud-application/angular-client/README.md
+++ b/examples/basic-crud-application/angular-client/README.md
@@ -1,31 +0,0 @@
-# Angular TodoMVC + Socket.IO
-
-This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 11.0.4.
-
-Inspired from the [TodoMVC](http://todomvc.com/) [angular example](https://github.com/tastejs/todomvc/tree/master/examples/angular2).
-
-![demo](assets/demo.gif)
-
-## Development server
-
-Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
-
-## Code scaffolding
-
-Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
-
-## Build
-
-Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory. Use the `--prod` flag for a production build.
-
-## Running unit tests
-
-Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).
-
-## Running end-to-end tests
-
-Run `ng e2e` to execute the end-to-end tests via [Protractor](http://www.protractortest.org/).
-
-## Further help
-
-To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI Overview and Command Reference](https://angular.io/cli) page.
--- a/examples/basic-crud-application/angular-client/angular.json
+++ b/examples/basic-crud-application/angular-client/angular.json
@@ -1,128 +0,0 @@
-{
-  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
-  "version": 1,
-  "newProjectRoot": "projects",
-  "projects": {
-    "angular-todomvc": {
-      "projectType": "application",
-      "schematics": {
-        "@schematics/angular:application": {
-          "strict": true
-        }
-      },
-      "root": "",
-      "sourceRoot": "src",
-      "prefix": "app",
-      "architect": {
-        "build": {
-          "builder": "@angular-devkit/build-angular:browser",
-          "options": {
-            "outputPath": "dist/angular-todomvc",
-            "index": "src/index.html",
-            "main": "src/main.ts",
-            "polyfills": "src/polyfills.ts",
-            "tsConfig": "tsconfig.app.json",
-            "aot": true,
-            "assets": [
-              "src/favicon.ico",
-              "src/assets"
-            ],
-            "styles": [
-              "src/styles.css"
-            ],
-            "scripts": []
-          },
-          "configurations": {
-            "production": {
-              "fileReplacements": [
-                {
-                  "replace": "src/environments/environment.ts",
-                  "with": "src/environments/environment.prod.ts"
-                }
-              ],
-              "optimization": true,
-              "outputHashing": "all",
-              "sourceMap": false,
-              "namedChunks": false,
-              "extractLicenses": true,
-              "vendorChunk": false,
-              "buildOptimizer": true,
-              "budgets": [
-                {
-                  "type": "initial",
-                  "maximumWarning": "500kb",
-                  "maximumError": "1mb"
-                },
-                {
-                  "type": "anyComponentStyle",
-                  "maximumWarning": "2kb",
-                  "maximumError": "4kb"
-                }
-              ]
-            }
-          }
-        },
-        "serve": {
-          "builder": "@angular-devkit/build-angular:dev-server",
-          "options": {
-            "browserTarget": "angular-todomvc:build"
-          },
-          "configurations": {
-            "production": {
-              "browserTarget": "angular-todomvc:build:production"
-            }
-          }
-        },
-        "extract-i18n": {
-          "builder": "@angular-devkit/build-angular:extract-i18n",
-          "options": {
-            "browserTarget": "angular-todomvc:build"
-          }
-        },
-        "test": {
-          "builder": "@angular-devkit/build-angular:karma",
-          "options": {
-            "main": "src/test.ts",
-            "polyfills": "src/polyfills.ts",
-            "tsConfig": "tsconfig.spec.json",
-            "karmaConfig": "karma.conf.js",
-            "assets": [
-              "src/favicon.ico",
-              "src/assets"
-            ],
-            "styles": [
-              "src/styles.css"
-            ],
-            "scripts": []
-          }
-        },
-        "lint": {
-          "builder": "@angular-devkit/build-angular:tslint",
-          "options": {
-            "tsConfig": [
-              "tsconfig.app.json",
-              "tsconfig.spec.json",
-              "e2e/tsconfig.json"
-            ],
-            "exclude": [
-              "**/node_modules/**"
-            ]
-          }
-        },
-        "e2e": {
-          "builder": "@angular-devkit/build-angular:protractor",
-          "options": {
-            "protractorConfig": "e2e/protractor.conf.js",
-            "devServerTarget": "angular-todomvc:serve"
-          },
-          "configurations": {
-            "production": {
-              "devServerTarget": "angular-todomvc:serve:production"
-            }
-          }
-        }
-      }
-    }
-  },
-  "defaultProject": "angular-todomvc"
-}
--- a/examples/basic-crud-application/angular-client/assets/demo.gif
+++ b/examples/basic-crud-application/angular-client/assets/demo.gif
--- a/examples/basic-crud-application/angular-client/e2e/protractor.conf.js
+++ b/examples/basic-crud-application/angular-client/e2e/protractor.conf.js
@@ -1,37 +0,0 @@
-// @ts-check
-// Protractor configuration file, see link for more information
-// https://github.com/angular/protractor/blob/master/lib/config.ts
-
-const { SpecReporter, StacktraceOption } = require('jasmine-spec-reporter');
-
-/**
- * @type { import("protractor").Config }
- */
-exports.config = {
-  allScriptsTimeout: 11000,
-  specs: [
-    './src/**/*.e2e-spec.ts'
-  ],
-  capabilities: {
-    browserName: 'chrome'
-  },
-  directConnect: true,
-  SELENIUM_PROMISE_MANAGER: false,
-  baseUrl: 'http://localhost:4200/',
-  framework: 'jasmine',
-  jasmineNodeOpts: {
-    showColors: true,
-    defaultTimeoutInterval: 30000,
-    print: function() {}
-  },
-  onPrepare() {
-    require('ts-node').register({
-      project: require('path').join(__dirname, './tsconfig.json')
-    });
-    jasmine.getEnv().addReporter(new SpecReporter({
-      spec: {
-        displayStacktrace: StacktraceOption.PRETTY
-      }
-    }));
-  }
-};
--- a/examples/basic-crud-application/angular-client/e2e/src/app.e2e-spec.ts
+++ b/examples/basic-crud-application/angular-client/e2e/src/app.e2e-spec.ts
@@ -1,23 +0,0 @@
-import { AppPage } from './app.po';
-import { browser, logging } from 'protractor';
-
-describe('workspace-project App', () => {
-  let page: AppPage;
-
-  beforeEach(() => {
-    page = new AppPage();
-  });
-
-  it('should display welcome message', async () => {
-    await page.navigateTo();
-    expect(await page.getTitleText()).toEqual('angular-todomvc app is running!');
-  });
-
-  afterEach(async () => {
-    // Assert that there are no errors emitted from the browser
-    const logs = await browser.manage().logs().get(logging.Type.BROWSER);
-    expect(logs).not.toContain(jasmine.objectContaining({
-      level: logging.Level.SEVERE,
-    } as logging.Entry));
-  });
-});
--- a/examples/basic-crud-application/angular-client/e2e/src/app.po.ts
+++ b/examples/basic-crud-application/angular-client/e2e/src/app.po.ts
@@ -1,11 +0,0 @@
-import { browser, by, element } from 'protractor';
-
-export class AppPage {
-  async navigateTo(): Promise<unknown> {
-    return browser.get(browser.baseUrl);
-  }
-
-  async getTitleText(): Promise<string> {
-    return element(by.css('app-root .content span')).getText();
-  }
-}
--- a/examples/basic-crud-application/angular-client/e2e/tsconfig.json
+++ b/examples/basic-crud-application/angular-client/e2e/tsconfig.json
@@ -1,13 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "extends": "../tsconfig.json",
-  "compilerOptions": {
-    "outDir": "../out-tsc/e2e",
-    "module": "commonjs",
-    "target": "es2018",
-    "types": [
-      "jasmine",
-      "node"
-    ]
-  }
-}
--- a/examples/basic-crud-application/angular-client/karma.conf.js
+++ b/examples/basic-crud-application/angular-client/karma.conf.js
@@ -1,44 +0,0 @@
-// Karma configuration file, see link for more information
-// https://karma-runner.github.io/1.0/config/configuration-file.html
-
-module.exports = function (config) {
-  config.set({
-    basePath: '',
-    frameworks: ['jasmine', '@angular-devkit/build-angular'],
-    plugins: [
-      require('karma-jasmine'),
-      require('karma-chrome-launcher'),
-      require('karma-jasmine-html-reporter'),
-      require('karma-coverage'),
-      require('@angular-devkit/build-angular/plugins/karma')
-    ],
-    client: {
-      jasmine: {
-        // you can add configuration options for Jasmine here
-        // the possible options are listed at https://jasmine.github.io/api/edge/Configuration.html
-        // for example, you can disable the random execution with `random: false`
-        // or set a specific seed with `seed: 4321`
-      },
-      clearContext: false // leave Jasmine Spec Runner output visible in browser
-    },
-    jasmineHtmlReporter: {
-      suppressAll: true // removes the duplicated traces
-    },
-    coverageReporter: {
-      dir: require('path').join(__dirname, './coverage/angular-todomvc'),
-      subdir: '.',
-      reporters: [
-        { type: 'html' },
-        { type: 'text-summary' }
-      ]
-    },
-    reporters: ['progress', 'kjhtml'],
-    port: 9876,
-    colors: true,
-    logLevel: config.LOG_INFO,
-    autoWatch: true,
-    browsers: ['Chrome'],
-    singleRun: false,
-    restartOnFileChange: true
-  });
-};
--- a/examples/basic-crud-application/angular-client/package.json
+++ b/examples/basic-crud-application/angular-client/package.json
@@ -1,46 +0,0 @@
-{
-  "name": "angular-todomvc",
-  "version": "0.0.0",
-  "scripts": {
-    "ng": "ng",
-    "start": "ng serve",
-    "build": "ng build",
-    "test": "ng test",
-    "lint": "ng lint",
-    "e2e": "ng e2e"
-  },
-  "private": true,
-  "dependencies": {
-    "@angular/animations": "~11.0.4",
-    "@angular/common": "~11.0.4",
-    "@angular/compiler": "~11.0.4",
-    "@angular/core": "~11.0.4",
-    "@angular/forms": "~11.0.4",
-    "@angular/platform-browser": "~11.0.4",
-    "@angular/platform-browser-dynamic": "~11.0.4",
-    "@angular/router": "~11.0.4",
-    "rxjs": "~6.6.0",
-    "socket.io-client": "^4.0.0",
-    "tslib": "^2.0.0",
-    "zone.js": "~0.10.2"
-  },
-  "devDependencies": {
-    "@angular-devkit/build-angular": "~0.1100.4",
-    "@angular/cli": "~11.0.4",
-    "@angular/compiler-cli": "~11.0.4",
-    "@types/jasmine": "~3.6.0",
-    "@types/node": "^12.11.1",
-    "codelyzer": "^6.0.0",
-    "jasmine-core": "~3.6.0",
-    "jasmine-spec-reporter": "~5.0.0",
-    "karma": "~5.1.0",
-    "karma-chrome-launcher": "~3.1.0",
-    "karma-coverage": "~2.0.3",
-    "karma-jasmine": "~4.0.0",
-    "karma-jasmine-html-reporter": "^1.5.0",
-    "protractor": "~7.0.0",
-    "ts-node": "~8.3.0",
-    "tslint": "~6.1.0",
-    "typescript": "~4.0.2"
-  }
-}
--- a/examples/basic-crud-application/angular-client/src/app/app.component.css
+++ b/examples/basic-crud-application/angular-client/src/app/app.component.css
--- a/examples/basic-crud-application/angular-client/src/app/app.component.html
+++ b/examples/basic-crud-application/angular-client/src/app/app.component.html
@@ -1,23 +0,0 @@
-<section class="todoapp">
-  <header class="header">
-    <h1>todos</h1>
-    <input class="new-todo" placeholder="What needs to be done?" autofocus="" [(ngModel)]="newTodoText" (keyup.enter)="addTodo()">
-  </header>
-  <section class="main" *ngIf="todoStore.todos.length > 0">
-    <input id="toggle-all" class="toggle-all" type="checkbox" *ngIf="todoStore.todos.length" #toggleall [checked]="todoStore.allCompleted()" (click)="todoStore.setAllTo(toggleall.checked)">
-    <ul class="todo-list">
-      <li *ngFor="let todo of todoStore.todos" [class.completed]="todo.completed" [class.editing]="todo.editing">
-        <div class="view">
-          <input class="toggle" type="checkbox" (click)="toggleCompletion(todo)" [checked]="todo.completed">
-          <label (dblclick)="editTodo(todo)">{{todo.title}}</label>
-          <button class="destroy" (click)="remove(todo)"></button>
-        </div>
-        <input class="edit" *ngIf="todo.editing" [value]="todo.title" #editedtodo (blur)="stopEditing(todo, editedtodo.value)" (keyup.enter)="updateEditingTodo(todo, editedtodo.value)" (keyup.escape)="cancelEditingTodo(todo)">
-      </li>
-    </ul>
-  </section>
-  <footer class="footer" *ngIf="todoStore.todos.length > 0">
-    <span class="todo-count"><strong>{{todoStore.getRemaining().length}}</strong> {{todoStore.getRemaining().length == 1 ? 'item' : 'items'}} left</span>
-    <button class="clear-completed" *ngIf="todoStore.getCompleted().length > 0" (click)="removeCompleted()">Clear completed</button>
-  </footer>
-</section>
--- a/examples/basic-crud-application/angular-client/src/app/app.component.spec.ts
+++ b/examples/basic-crud-application/angular-client/src/app/app.component.spec.ts
@@ -1,31 +0,0 @@
-import { TestBed } from '@angular/core/testing';
-import { AppComponent } from './app.component';
-
-describe('AppComponent', () => {
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      declarations: [
-        AppComponent
-      ],
-    }).compileComponents();
-  });
-
-  it('should create the app', () => {
-    const fixture = TestBed.createComponent(AppComponent);
-    const app = fixture.componentInstance;
-    expect(app).toBeTruthy();
-  });
-
-  it(`should have as title 'angular-todomvc'`, () => {
-    const fixture = TestBed.createComponent(AppComponent);
-    const app = fixture.componentInstance;
-    expect(app.title).toEqual('angular-todomvc');
-  });
-
-  it('should render title', () => {
-    const fixture = TestBed.createComponent(AppComponent);
-    fixture.detectChanges();
-    const compiled = fixture.nativeElement;
-    expect(compiled.querySelector('.content span').textContent).toContain('angular-todomvc app is running!');
-  });
-});
--- a/examples/basic-crud-application/angular-client/src/app/app.component.ts
+++ b/examples/basic-crud-application/angular-client/src/app/app.component.ts
@@ -1,59 +0,0 @@
-import { Component } from '@angular/core';
-import { TodoStore, Todo } from './store';
-
-@Component({
-  selector: 'app-root',
-  templateUrl: './app.component.html',
-  styleUrls: ['./app.component.css']
-})
-export class AppComponent {
-  todoStore: TodoStore;
-  newTodoText = '';
-
-  constructor(todoStore: TodoStore) {
-    this.todoStore = todoStore;
-  }
-
-  stopEditing(todo: Todo, editedTitle: string) {
-    todo.title = editedTitle;
-    todo.editing = false;
-  }
-
-  cancelEditingTodo(todo: Todo) {
-    todo.editing = false;
-  }
-
-  updateEditingTodo(todo: Todo, editedTitle: string) {
-    editedTitle = editedTitle.trim();
-    todo.editing = false;
-
-    if (editedTitle.length === 0) {
-      return this.todoStore.remove(todo);
-    }
-
-    todo.title = editedTitle;
-  }
-
-  editTodo(todo: Todo) {
-    todo.editing = true;
-  }
-
-  removeCompleted() {
-    this.todoStore.removeCompleted();
-  }
-
-  toggleCompletion(todo: Todo) {
-    this.todoStore.toggleCompletion(todo);
-  }
-
-  remove(todo: Todo){
-    this.todoStore.remove(todo);
-  }
-
-  addTodo() {
-    if (this.newTodoText.trim().length) {
-      this.todoStore.add(this.newTodoText);
-      this.newTodoText = '';
-    }
-  }
-}
--- a/examples/basic-crud-application/angular-client/src/app/app.module.ts
+++ b/examples/basic-crud-application/angular-client/src/app/app.module.ts
@@ -1,19 +0,0 @@
-import { BrowserModule } from '@angular/platform-browser';
-import { NgModule } from '@angular/core';
-
-import { AppComponent } from './app.component';
-import { TodoStore } from './store';
-import { FormsModule } from "@angular/forms";
-
-@NgModule({
-  declarations: [
-    AppComponent
-  ],
-  imports: [
-    BrowserModule,
-    FormsModule
-  ],
-  providers: [TodoStore],
-  bootstrap: [AppComponent]
-})
-export class AppModule { }
--- a/examples/basic-crud-application/angular-client/src/app/store.ts
+++ b/examples/basic-crud-application/angular-client/src/app/store.ts
@@ -1,140 +0,0 @@
-import { io, Socket } from "socket.io-client";
-import { ClientEvents, ServerEvents } from "../../../server/lib/events";
-import { environment } from '../environments/environment';
-
-export interface Todo {
-  id: string,
-  title: string,
-  completed: boolean,
-  editing: boolean,
-  synced: boolean
-}
-
-const mapTodo = (todo: any) => {
-  return {
-    ...todo,
-    editing: false,
-    synced: true
-  }
-}
-
-export class TodoStore {
-  public todos: Array<Todo> = [];
-  private socket: Socket<ServerEvents, ClientEvents>;
-
-  constructor() {
-    this.socket = io(environment.serverUrl);
-
-    this.socket.on("connect", () => {
-      this.socket.emit("todo:list", (res) => {
-        if ("error" in res) {
-          // handle the error
-          return;
-        }
-        this.todos = res.data.map(mapTodo);
-      });
-    });
-
-    this.socket.on("todo:created", (todo) => {
-      this.todos.push(mapTodo(todo));
-    });
-
-    this.socket.on("todo:updated", (todo) => {
-      const existingTodo = this.todos.find(t => {
-        return t.id === todo.id
-      });
-      if (existingTodo) {
-        existingTodo.title = todo.title;
-        existingTodo.completed = todo.completed;
-      }
-    });
-
-    this.socket.on("todo:deleted", (id) => {
-      const index = this.todos.findIndex(t => {
-        return t.id === id
-      });
-      if (index !== -1) {
-        this.todos.splice(index, 1);
-      }
-    })
-  }
-
-  private getWithCompleted(completed: boolean) {
-    return this.todos.filter((todo: Todo) => todo.completed === completed);
-  }
-
-  allCompleted() {
-    return this.todos.length === this.getCompleted().length;
-  }
-
-  setAllTo(completed: boolean) {
-    this.todos.forEach(todo => {
-      todo.completed = completed;
-      todo.synced = false;
-      this.socket.emit("todo:update", todo, (res) => {
-        if (res && "error" in res) {
-          // handle the error
-          return;
-        }
-        todo.synced = true;
-      });
-    });
-  }
-
-  removeCompleted() {
-    this.getCompleted().forEach((todo) => {
-      this.socket.emit("todo:delete", todo.id, (res) => {
-        if (res && "error" in res) {
-          // handle the error
-        }
-      });
-    })
-    this.todos = this.getRemaining();
-  }
-
-  getRemaining() {
-    return this.getWithCompleted(false);
-  }
-
-  getCompleted() {
-    return this.getWithCompleted(true);
-  }
-
-  toggleCompletion(todo: Todo) {
-    todo.completed = !todo.completed;
-    todo.synced = false;
-    this.socket.emit("todo:update", todo, (res) => {
-      if (res && "error" in res) {
-        // handle the error
-        return;
-      }
-      todo.synced = true;
-    })
-  }
-
-  remove(todo: Todo) {
-    this.todos.splice(this.todos.indexOf(todo), 1);
-    this.socket.emit("todo:delete", todo.id, (res) => {
-      if (res && "error" in res) {
-        // handle the error
-      }
-    });
-  }
-
-  add(title: string) {
-    this.socket.emit("todo:create", { title, completed: false }, (res) => {
-      if ("error" in res) {
-        // handle the error
-        return;
-      }
-      this.todos.push({
-        id: res.data,
-        title,
-        completed: false,
-        editing: false,
-        synced: true
-      });
-    });
-  }
-}
-
--- a/examples/basic-crud-application/angular-client/src/assets/.gitkeep
+++ b/examples/basic-crud-application/angular-client/src/assets/.gitkeep
--- a/examples/basic-crud-application/angular-client/src/environments/environment.prod.ts
+++ b/examples/basic-crud-application/angular-client/src/environments/environment.prod.ts
@@ -1,4 +0,0 @@
-export const environment = {
-  production: true,
-  serverUrl: "https://my-custom-domain.com"
-};
--- a/examples/basic-crud-application/angular-client/src/environments/environment.ts
+++ b/examples/basic-crud-application/angular-client/src/environments/environment.ts
@@ -1,17 +0,0 @@
-// This file can be replaced during build by using the `fileReplacements` array.
-// `ng build --prod` replaces `environment.ts` with `environment.prod.ts`.
-// The list of file replacements can be found in `angular.json`.
-
-export const environment = {
-  production: false,
-  serverUrl: "http://localhost:3000"
-};
-
-/*
- * For easier debugging in development mode, you can import the following file
- * to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
- *
- * This import should be commented out in production mode because it will have a negative impact
- * on performance if an error is thrown.
- */
-// import 'zone.js/dist/zone-error';  // Included with Angular CLI.
--- a/examples/basic-crud-application/angular-client/src/favicon.ico
+++ b/examples/basic-crud-application/angular-client/src/favicon.ico
--- a/examples/basic-crud-application/angular-client/src/index.html
+++ b/examples/basic-crud-application/angular-client/src/index.html
@@ -1,13 +0,0 @@
-<!doctype html>
-<html lang="en">
-<head>
-  <meta charset="utf-8">
-  <title>Angular Todo MVC</title>
-  <base href="/">
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="icon" type="image/x-icon" href="favicon.ico">
-</head>
-<body>
-  <app-root></app-root>
-</body>
-</html>
--- a/examples/basic-crud-application/angular-client/src/main.ts
+++ b/examples/basic-crud-application/angular-client/src/main.ts
@@ -1,12 +0,0 @@
-import { enableProdMode } from '@angular/core';
-import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
-
-import { AppModule } from './app/app.module';
-import { environment } from './environments/environment';
-
-if (environment.production) {
-  enableProdMode();
-}
-
-platformBrowserDynamic().bootstrapModule(AppModule)
-  .catch(err => console.error(err));
--- a/examples/basic-crud-application/angular-client/src/polyfills.ts
+++ b/examples/basic-crud-application/angular-client/src/polyfills.ts
@@ -1,63 +0,0 @@
-/**
- * This file includes polyfills needed by Angular and is loaded before the app.
- * You can add your own extra polyfills to this file.
- *
- * This file is divided into 2 sections:
- *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
- *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
- *      file.
- *
- * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
- * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
- * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
- *
- * Learn more in https://angular.io/guide/browser-support
- */
-
-/***************************************************************************************************
- * BROWSER POLYFILLS
- */
-
-/** IE11 requires the following for NgClass support on SVG elements */
-// import 'classlist.js';  // Run `npm install --save classlist.js`.
-
-/**
- * Web Animations `@angular/platform-browser/animations`
- * Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
- * Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
- */
-// import 'web-animations-js';  // Run `npm install --save web-animations-js`.
-
-/**
- * By default, zone.js will patch all possible macroTask and DomEvents
- * user can disable parts of macroTask/DomEvents patch by setting following flags
- * because those flags need to be set before `zone.js` being loaded, and webpack
- * will put import in the top of bundle, so user need to create a separate file
- * in this directory (for example: zone-flags.ts), and put the following flags
- * into that file, and then add the following code before importing zone.js.
- * import './zone-flags';
- *
- * The flags allowed in zone-flags.ts are listed here.
- *
- * The following flags will work for all browsers.
- *
- * (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
- * (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
- * (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
- *
- *  in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
- *  with the following flag, it will bypass `zone.js` patch for IE/Edge
- *
- *  (window as any).__Zone_enable_cross_context_check = true;
- *
- */
-
-/***************************************************************************************************
- * Zone JS is required by default for Angular itself.
- */
-import 'zone.js/dist/zone';  // Included with Angular CLI.
-
-
-/***************************************************************************************************
- * APPLICATION IMPORTS
- */
--- a/examples/basic-crud-application/angular-client/src/styles.css
+++ b/examples/basic-crud-application/angular-client/src/styles.css
@@ -1,381 +0,0 @@
-/* imported from node_modules/todomvc-app-css/index.css */
-html,
-body {
-  margin: 0;
-  padding: 0;
-}
-
-button {
-  margin: 0;
-  padding: 0;
-  border: 0;
-  background: none;
-  font-size: 100%;
-  vertical-align: baseline;
-  font-family: inherit;
-  font-weight: inherit;
-  color: inherit;
-  -webkit-appearance: none;
-  appearance: none;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-body {
-  font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
-  line-height: 1.4em;
-  background: #f5f5f5;
-  color: #111111;
-  min-width: 230px;
-  max-width: 550px;
-  margin: 0 auto;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-  font-weight: 300;
-}
-
-:focus {
-  outline: 0;
-}
-
-.hidden {
-  display: none;
-}
-
-.todoapp {
-  background: #fff;
-  margin: 130px 0 40px 0;
-  position: relative;
-  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
-  0 25px 50px 0 rgba(0, 0, 0, 0.1);
-}
-
-.todoapp input::-webkit-input-placeholder {
-  font-style: italic;
-  font-weight: 300;
-  color: rgba(0, 0, 0, 0.4);
-}
-
-.todoapp input::-moz-placeholder {
-  font-style: italic;
-  font-weight: 300;
-  color: rgba(0, 0, 0, 0.4);
-}
-
-.todoapp input::input-placeholder {
-  font-style: italic;
-  font-weight: 300;
-  color: rgba(0, 0, 0, 0.4);
-}
-
-.todoapp h1 {
-  position: absolute;
-  top: -140px;
-  width: 100%;
-  font-size: 80px;
-  font-weight: 200;
-  text-align: center;
-  color: #b83f45;
-  -webkit-text-rendering: optimizeLegibility;
-  -moz-text-rendering: optimizeLegibility;
-  text-rendering: optimizeLegibility;
-}
-
-.new-todo,
-.edit {
-  position: relative;
-  margin: 0;
-  width: 100%;
-  font-size: 24px;
-  font-family: inherit;
-  font-weight: inherit;
-  line-height: 1.4em;
-  color: inherit;
-  padding: 6px;
-  border: 1px solid #999;
-  box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
-  box-sizing: border-box;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-.new-todo {
-  padding: 16px 16px 16px 60px;
-  border: none;
-  background: rgba(0, 0, 0, 0.003);
-  box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
-}
-
-.main {
-  position: relative;
-  z-index: 2;
-  border-top: 1px solid #e6e6e6;
-}
-
-.toggle-all {
-  width: 1px;
-  height: 1px;
-  border: none; /* Mobile Safari */
-  opacity: 0;
-  position: absolute;
-  right: 100%;
-  bottom: 100%;
-}
-
-.toggle-all + label {
-  width: 60px;
-  height: 34px;
-  font-size: 0;
-  position: absolute;
-  top: -52px;
-  left: -13px;
-  -webkit-transform: rotate(90deg);
-  transform: rotate(90deg);
-}
-
-.toggle-all + label:before {
-  content: '❯';
-  font-size: 22px;
-  color: #e6e6e6;
-  padding: 10px 27px 10px 27px;
-}
-
-.toggle-all:checked + label:before {
-  color: #737373;
-}
-
-.todo-list {
-  margin: 0;
-  padding: 0;
-  list-style: none;
-}
-
-.todo-list li {
-  position: relative;
-  font-size: 24px;
-  border-bottom: 1px solid #ededed;
-}
-
-.todo-list li:last-child {
-  border-bottom: none;
-}
-
-.todo-list li.editing {
-  border-bottom: none;
-  padding: 0;
-}
-
-.todo-list li.editing .edit {
-  display: block;
-  width: calc(100% - 43px);
-  padding: 12px 16px;
-  margin: 0 0 0 43px;
-}
-
-.todo-list li.editing .view {
-  display: none;
-}
-
-.todo-list li .toggle {
-  text-align: center;
-  width: 40px;
-  /* auto, since non-WebKit browsers doesn't support input styling */
-  height: auto;
-  position: absolute;
-  top: 0;
-  bottom: 0;
-  margin: auto 0;
-  border: none; /* Mobile Safari */
-  -webkit-appearance: none;
-  appearance: none;
-}
-
-.todo-list li .toggle {
-  opacity: 0;
-}
-
-.todo-list li .toggle + label {
-  /*
-    Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
-    IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
-  */
-  background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
-  background-repeat: no-repeat;
-  background-position: center left;
-}
-
-.todo-list li .toggle:checked + label {
-  background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
-}
-
-.todo-list li label {
-  word-break: break-all;
-  padding: 15px 15px 15px 60px;
-  display: block;
-  line-height: 1.2;
-  transition: color 0.4s;
-  font-weight: 400;
-  color: #4d4d4d;
-}
-
-.todo-list li.completed label {
-  color: #cdcdcd;
-  text-decoration: line-through;
-}
-
-.todo-list li .destroy {
-  display: none;
-  position: absolute;
-  top: 0;
-  right: 10px;
-  bottom: 0;
-  width: 40px;
-  height: 40px;
-  margin: auto 0;
-  font-size: 30px;
-  color: #cc9a9a;
-  margin-bottom: 11px;
-  transition: color 0.2s ease-out;
-}
-
-.todo-list li .destroy:hover {
-  color: #af5b5e;
-}
-
-.todo-list li .destroy:after {
-  content: '×';
-}
-
-.todo-list li:hover .destroy {
-  display: block;
-}
-
-.todo-list li .edit {
-  display: none;
-}
-
-.todo-list li.editing:last-child {
-  margin-bottom: -1px;
-}
-
-.footer {
-  padding: 10px 15px;
-  height: 20px;
-  text-align: center;
-  font-size: 15px;
-  border-top: 1px solid #e6e6e6;
-}
-
-.footer:before {
-  content: '';
-  position: absolute;
-  right: 0;
-  bottom: 0;
-  left: 0;
-  height: 50px;
-  overflow: hidden;
-  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2),
-  0 8px 0 -3px #f6f6f6,
-  0 9px 1px -3px rgba(0, 0, 0, 0.2),
-  0 16px 0 -6px #f6f6f6,
-  0 17px 2px -6px rgba(0, 0, 0, 0.2);
-}
-
-.todo-count {
-  float: left;
-  text-align: left;
-}
-
-.todo-count strong {
-  font-weight: 300;
-}
-
-.filters {
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  position: absolute;
-  right: 0;
-  left: 0;
-}
-
-.filters li {
-  display: inline;
-}
-
-.filters li a {
-  color: inherit;
-  margin: 3px;
-  padding: 3px 7px;
-  text-decoration: none;
-  border: 1px solid transparent;
-  border-radius: 3px;
-}
-
-.filters li a:hover {
-  border-color: rgba(175, 47, 47, 0.1);
-}
-
-.filters li a.selected {
-  border-color: rgba(175, 47, 47, 0.2);
-}
-
-.clear-completed,
-html .clear-completed:active {
-  float: right;
-  position: relative;
-  line-height: 20px;
-  text-decoration: none;
-  cursor: pointer;
-}
-
-.clear-completed:hover {
-  text-decoration: underline;
-}
-
-.info {
-  margin: 65px auto 0;
-  color: #4d4d4d;
-  font-size: 11px;
-  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
-  text-align: center;
-}
-
-.info p {
-  line-height: 1;
-}
-
-.info a {
-  color: inherit;
-  text-decoration: none;
-  font-weight: 400;
-}
-
-.info a:hover {
-  text-decoration: underline;
-}
-
-/*
-	Hack to remove background from Mobile Safari.
-	Can't use it globally since it destroys checkboxes in Firefox
-*/
-@media screen and (-webkit-min-device-pixel-ratio:0) {
-  .toggle-all,
-  .todo-list li .toggle {
-    background: none;
-  }
-
-  .todo-list li .toggle {
-    height: 40px;
-  }
-}
-
-@media (max-width: 430px) {
-  .footer {
-    height: 50px;
-  }
-
-  .filters {
-    bottom: 10px;
-  }
-}
--- a/examples/basic-crud-application/angular-client/src/test.ts
+++ b/examples/basic-crud-application/angular-client/src/test.ts
@@ -1,25 +0,0 @@
-// This file is required by karma.conf.js and loads recursively all the .spec and framework files
-
-import 'zone.js/dist/zone-testing';
-import { getTestBed } from '@angular/core/testing';
-import {
-  BrowserDynamicTestingModule,
-  platformBrowserDynamicTesting
-} from '@angular/platform-browser-dynamic/testing';
-
-declare const require: {
-  context(path: string, deep?: boolean, filter?: RegExp): {
-    keys(): string[];
-    <T>(id: string): T;
-  };
-};
-
-// First, initialize the Angular testing environment.
-getTestBed().initTestEnvironment(
-  BrowserDynamicTestingModule,
-  platformBrowserDynamicTesting()
-);
-// Then we find all the tests.
-const context = require.context('./', true, /\.spec\.ts$/);
-// And load the modules.
-context.keys().map(context);
--- a/examples/basic-crud-application/angular-client/tsconfig.app.json
+++ b/examples/basic-crud-application/angular-client/tsconfig.app.json
@@ -1,15 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "outDir": "./out-tsc/app",
-    "types": []
-  },
-  "files": [
-    "src/main.ts",
-    "src/polyfills.ts"
-  ],
-  "include": [
-    "src/**/*.d.ts"
-  ]
-}
--- a/examples/basic-crud-application/angular-client/tsconfig.json
+++ b/examples/basic-crud-application/angular-client/tsconfig.json
@@ -1,29 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "compileOnSave": false,
-  "compilerOptions": {
-    "baseUrl": "./",
-    "outDir": "./dist/out-tsc",
-    "forceConsistentCasingInFileNames": true,
-    "strict": true,
-    "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "sourceMap": true,
-    "declaration": false,
-    "downlevelIteration": true,
-    "experimentalDecorators": true,
-    "moduleResolution": "node",
-    "importHelpers": true,
-    "target": "es2015",
-    "module": "es2020",
-    "lib": [
-      "es2018",
-      "dom"
-    ]
-  },
-  "angularCompilerOptions": {
-    "strictInjectionParameters": true,
-    "strictInputAccessModifiers": true,
-    "strictTemplates": true
-  }
-}
--- a/examples/basic-crud-application/angular-client/tsconfig.spec.json
+++ b/examples/basic-crud-application/angular-client/tsconfig.spec.json
@@ -1,18 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "outDir": "./out-tsc/spec",
-    "types": [
-      "jasmine"
-    ]
-  },
-  "files": [
-    "src/test.ts",
-    "src/polyfills.ts"
-  ],
-  "include": [
-    "src/**/*.spec.ts",
-    "src/**/*.d.ts"
-  ]
-}
--- a/examples/basic-crud-application/angular-client/tslint.json
+++ b/examples/basic-crud-application/angular-client/tslint.json
@@ -1,152 +0,0 @@
-{
-  "extends": "tslint:recommended",
-  "rulesDirectory": [
-    "codelyzer"
-  ],
-  "rules": {
-    "align": {
-      "options": [
-        "parameters",
-        "statements"
-      ]
-    },
-    "array-type": false,
-    "arrow-return-shorthand": true,
-    "curly": true,
-    "deprecation": {
-      "severity": "warning"
-    },
-    "eofline": true,
-    "import-blacklist": [
-      true,
-      "rxjs/Rx"
-    ],
-    "import-spacing": true,
-    "indent": {
-      "options": [
-        "spaces"
-      ]
-    },
-    "max-classes-per-file": false,
-    "max-line-length": [
-      true,
-      140
-    ],
-    "member-ordering": [
-      true,
-      {
-        "order": [
-          "static-field",
-          "instance-field",
-          "static-method",
-          "instance-method"
-        ]
-      }
-    ],
-    "no-console": [
-      true,
-      "debug",
-      "info",
-      "time",
-      "timeEnd",
-      "trace"
-    ],
-    "no-empty": false,
-    "no-inferrable-types": [
-      true,
-      "ignore-params"
-    ],
-    "no-non-null-assertion": true,
-    "no-redundant-jsdoc": true,
-    "no-switch-case-fall-through": true,
-    "no-var-requires": false,
-    "object-literal-key-quotes": [
-      true,
-      "as-needed"
-    ],
-    "quotemark": [
-      true,
-      "single"
-    ],
-    "semicolon": {
-      "options": [
-        "always"
-      ]
-    },
-    "space-before-function-paren": {
-      "options": {
-        "anonymous": "never",
-        "asyncArrow": "always",
-        "constructor": "never",
-        "method": "never",
-        "named": "never"
-      }
-    },
-    "typedef": [
-      true,
-      "call-signature"
-    ],
-    "typedef-whitespace": {
-      "options": [
-        {
-          "call-signature": "nospace",
-          "index-signature": "nospace",
-          "parameter": "nospace",
-          "property-declaration": "nospace",
-          "variable-declaration": "nospace"
-        },
-        {
-          "call-signature": "onespace",
-          "index-signature": "onespace",
-          "parameter": "onespace",
-          "property-declaration": "onespace",
-          "variable-declaration": "onespace"
-        }
-      ]
-    },
-    "variable-name": {
-      "options": [
-        "ban-keywords",
-        "check-format",
-        "allow-pascal-case"
-      ]
-    },
-    "whitespace": {
-      "options": [
-        "check-branch",
-        "check-decl",
-        "check-operator",
-        "check-separator",
-        "check-type",
-        "check-typecast"
-      ]
-    },
-    "component-class-suffix": true,
-    "contextual-lifecycle": true,
-    "directive-class-suffix": true,
-    "no-conflicting-lifecycle": true,
-    "no-host-metadata-property": true,
-    "no-input-rename": true,
-    "no-inputs-metadata-property": true,
-    "no-output-native": true,
-    "no-output-on-prefix": true,
-    "no-output-rename": true,
-    "no-outputs-metadata-property": true,
-    "template-banana-in-box": true,
-    "template-no-negated-async": true,
-    "use-lifecycle-interface": true,
-    "use-pipe-transform-interface": true,
-    "directive-selector": [
-      true,
-      "attribute",
-      "app",
-      "camelCase"
-    ],
-    "component-selector": [
-      true,
-      "element",
-      "app",
-      "kebab-case"
-    ]
-  }
-}
--- a/examples/basic-crud-application/server/lib/app.ts
+++ b/examples/basic-crud-application/server/lib/app.ts
@@ -1,35 +0,0 @@
-import { Server as HttpServer } from "http";
-import { Server, ServerOptions } from "socket.io";
-import { ClientEvents, ServerEvents } from "./events";
-import { TodoRepository } from "./todo-management/todo.repository";
-import createTodoHandlers from "./todo-management/todo.handlers";
-
-export interface Components {
-  todoRepository: TodoRepository;
-}
-
-export function createApplication(
-  httpServer: HttpServer,
-  components: Components,
-  serverOptions: Partial<ServerOptions> = {}
-): Server<ClientEvents, ServerEvents> {
-  const io = new Server<ClientEvents, ServerEvents>(httpServer, serverOptions);
-
-  const {
-    createTodo,
-    readTodo,
-    updateTodo,
-    deleteTodo,
-    listTodo,
-  } = createTodoHandlers(components);
-
-  io.on("connection", (socket) => {
-    socket.on("todo:create", createTodo);
-    socket.on("todo:read", readTodo);
-    socket.on("todo:update", updateTodo);
-    socket.on("todo:delete", deleteTodo);
-    socket.on("todo:list", listTodo);
-  });
-
-  return io;
-}
--- a/examples/basic-crud-application/server/lib/events.ts
+++ b/examples/basic-crud-application/server/lib/events.ts
@@ -1,37 +0,0 @@
-import { Todo, TodoID } from "./todo-management/todo.repository";
-import { ValidationErrorItem } from "joi";
-
-interface Error {
-  error: string;
-  errorDetails?: ValidationErrorItem[];
-}
-
-interface Success<T> {
-  data: T;
-}
-
-export type Response<T> = Error | Success<T>;
-
-export interface ServerEvents {
-  "todo:created": (todo: Todo) => void;
-  "todo:updated": (todo: Todo) => void;
-  "todo:deleted": (id: TodoID) => void;
-}
-
-export interface ClientEvents {
-  "todo:list": (callback: (res: Response<Todo[]>) => void) => void;
-
-  "todo:create": (
-    payload: Omit<Todo, "id">,
-    callback: (res: Response<TodoID>) => void
-  ) => void;
-
-  "todo:read": (id: TodoID, callback: (res: Response<Todo>) => void) => void;
-
-  "todo:update": (
-    payload: Todo,
-    callback: (res?: Response<void>) => void
-  ) => void;
-
-  "todo:delete": (id: TodoID, callback: (res?: Response<void>) => void) => void;
-}
--- a/examples/basic-crud-application/server/lib/index.ts
+++ b/examples/basic-crud-application/server/lib/index.ts
@@ -1,19 +0,0 @@
-import { createServer } from "http";
-import { createApplication } from "./app";
-import { InMemoryTodoRepository } from "./todo-management/todo.repository";
-
-const httpServer = createServer();
-
-createApplication(
-  httpServer,
-  {
-    todoRepository: new InMemoryTodoRepository(),
-  },
-  {
-    cors: {
-      origin: ["http://localhost:4200"],
-    },
-  }
-);
-
-httpServer.listen(3000);
--- a/examples/basic-crud-application/server/lib/todo-management/todo.handlers.ts
+++ b/examples/basic-crud-application/server/lib/todo-management/todo.handlers.ts
@@ -1,159 +0,0 @@
-import { Errors, mapErrorDetails, sanitizeErrorMessage } from "../util";
-import { v4 as uuid } from "uuid";
-import { Components } from "../app";
-import Joi = require("joi");
-import { Todo, TodoID } from "./todo.repository";
-import { ClientEvents, Response, ServerEvents } from "../events";
-import { Socket } from "socket.io";
-
-const idSchema = Joi.string().guid({
-  version: "uuidv4",
-});
-
-const todoSchema = Joi.object({
-  id: idSchema.alter({
-    create: (schema) => schema.forbidden(),
-    update: (schema) => schema.required(),
-  }),
-  title: Joi.string().max(256).required(),
-  completed: Joi.boolean().required(),
-});
-
-export default function (components: Components) {
-  const { todoRepository } = components;
-  return {
-    createTodo: async function (
-      payload: Omit<Todo, "id">,
-      callback: (res: Response<TodoID>) => void
-    ) {
-      // @ts-ignore
-      const socket: Socket<ClientEvents, ServerEvents> = this;
-
-      // validate the payload
-      const { error, value } = todoSchema.tailor("create").validate(payload, {
-        abortEarly: false,
-        stripUnknown: true,
-      });
-
-      if (error) {
-        return callback({
-          error: Errors.INVALID_PAYLOAD,
-          errorDetails: mapErrorDetails(error.details),
-        });
-      }
-
-      value.id = uuid();
-
-      // persist the entity
-      try {
-        await todoRepository.save(value);
-      } catch (e) {
-        return callback({
-          error: sanitizeErrorMessage(e),
-        });
-      }
-
-      // acknowledge the creation
-      callback({
-        data: value.id,
-      });
-
-      // notify the other users
-      socket.broadcast.emit("todo:created", value);
-    },
-
-    readTodo: async function (
-      id: TodoID,
-      callback: (res: Response<Todo>) => void
-    ) {
-      const { error } = idSchema.validate(id);
-
-      if (error) {
-        return callback({
-          error: Errors.ENTITY_NOT_FOUND,
-        });
-      }
-
-      try {
-        const todo = await todoRepository.findById(id);
-        callback({
-          data: todo,
-        });
-      } catch (e) {
-        callback({
-          error: sanitizeErrorMessage(e),
-        });
-      }
-    },
-
-    updateTodo: async function (
-      payload: Todo,
-      callback: (res?: Response<void>) => void
-    ) {
-      // @ts-ignore
-      const socket: Socket<ClientEvents, ServerEvents> = this;
-
-      const { error, value } = todoSchema.tailor("update").validate(payload, {
-        abortEarly: false,
-        stripUnknown: true,
-      });
-
-      if (error) {
-        return callback({
-          error: Errors.INVALID_PAYLOAD,
-          errorDetails: mapErrorDetails(error.details),
-        });
-      }
-
-      try {
-        await todoRepository.save(value);
-      } catch (e) {
-        return callback({
-          error: sanitizeErrorMessage(e),
-        });
-      }
-
-      callback();
-      socket.broadcast.emit("todo:updated", value);
-    },
-
-    deleteTodo: async function (
-      id: TodoID,
-      callback: (res?: Response<void>) => void
-    ) {
-      // @ts-ignore
-      const socket: Socket<ClientEvents, ServerEvents> = this;
-
-      const { error } = idSchema.validate(id);
-
-      if (error) {
-        return callback({
-          error: Errors.ENTITY_NOT_FOUND,
-        });
-      }
-
-      try {
-        await todoRepository.deleteById(id);
-      } catch (e) {
-        return callback({
-          error: sanitizeErrorMessage(e),
-        });
-      }
-
-      callback();
-      socket.broadcast.emit("todo:deleted", id);
-    },
-
-    listTodo: async function (callback: (res: Response<Todo[]>) => void) {
-      try {
-        callback({
-          data: await todoRepository.findAll(),
-        });
-      } catch (e) {
-        callback({
-          error: sanitizeErrorMessage(e),
-        });
-      }
-    },
-  };
-}
--- a/examples/basic-crud-application/server/lib/todo-management/todo.repository.ts
+++ b/examples/basic-crud-application/server/lib/todo-management/todo.repository.ts
@@ -1,49 +0,0 @@
-import { Errors } from "../util";
-
-abstract class CrudRepository<T, ID> {
-  abstract findAll(): Promise<T[]>;
-  abstract findById(id: ID): Promise<T>;
-  abstract save(entity: T): Promise<void>;
-  abstract deleteById(id: ID): Promise<void>;
-}
-
-export type TodoID = string;
-
-export interface Todo {
-  id: TodoID;
-  completed: boolean;
-  title: string;
-}
-
-export abstract class TodoRepository extends CrudRepository<Todo, TodoID> {}
-
-export class InMemoryTodoRepository extends TodoRepository {
-  private readonly todos: Map<TodoID, Todo> = new Map();
-
-  findAll(): Promise<Todo[]> {
-    const entities = Array.from(this.todos.values());
-    return Promise.resolve(entities);
-  }
-
-  findById(id: TodoID): Promise<Todo> {
-    if (this.todos.has(id)) {
-      return Promise.resolve(this.todos.get(id)!);
-    } else {
-      return Promise.reject(Errors.ENTITY_NOT_FOUND);
-    }
-  }
-
-  save(entity: Todo): Promise<void> {
-    this.todos.set(entity.id, entity);
-    return Promise.resolve();
-  }
-
-  deleteById(id: TodoID): Promise<void> {
-    const deleted = this.todos.delete(id);
-    if (deleted) {
-      return Promise.resolve();
-    } else {
-      return Promise.reject(Errors.ENTITY_NOT_FOUND);
-    }
-  }
-}
--- a/examples/basic-crud-application/server/lib/util.ts
+++ b/examples/basic-crud-application/server/lib/util.ts
@@ -1,24 +0,0 @@
-import { ValidationErrorItem } from "joi";
-
-export enum Errors {
-  ENTITY_NOT_FOUND = "entity not found",
-  INVALID_PAYLOAD = "invalid payload",
-}
-
-const errorValues: string[] = Object.values(Errors);
-
-export function sanitizeErrorMessage(message: string) {
-  if (errorValues.includes(message)) {
-    return message;
-  } else {
-    return "an unknown error has occurred";
-  }
-}
-
-export function mapErrorDetails(details: ValidationErrorItem[]) {
-  return details.map((item) => ({
-    message: item.message,
-    path: item.path,
-    type: item.type,
-  }));
-}
--- a/examples/basic-crud-application/server/package.json
+++ b/examples/basic-crud-application/server/package.json
@@ -1,36 +0,0 @@
-{
-  "name": "basic-crud-server",
-  "version": "0.0.1",
-  "description": "Server for the Basic CRUD Socket.IO example",
-  "main": "dist/lib/index.js",
-  "scripts": {
-    "start": "ts-node lib/index.ts",
-    "build": "tsc",
-    "test": "nyc mocha --require ts-node/register test/**/*.ts"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/socketio/socket.io.git"
-  },
-  "author": "Damien Arrachequesne <damien.arrachequesne@gmail.com>",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/socketio/socket.io/issues"
-  },
-  "homepage": "https://github.com/socketio/socket.io#readme",
-  "dependencies": {
-    "joi": "^17.4.0",
-    "socket.io": "^4.0.1",
-    "uuid": "^8.3.2"
-  },
-  "devDependencies": {
-    "@types/chai": "^4.2.16",
-    "@types/uuid": "^8.3.0",
-    "chai": "^4.3.4",
-    "mocha": "^8.3.2",
-    "nyc": "^15.1.0",
-    "socket.io-client": "^4.0.1",
-    "ts-node": "^9.1.1",
-    "typescript": "^4.2.4"
-  }
-}
--- a/examples/basic-crud-application/server/test/todo-management/todo.tests.ts
+++ b/examples/basic-crud-application/server/test/todo-management/todo.tests.ts
@@ -1,309 +0,0 @@
-import { createApplication } from "../../lib/app";
-import { createServer, Server } from "http";
-import {
-  InMemoryTodoRepository,
-  TodoRepository,
-} from "../../lib/todo-management/todo.repository";
-import { AddressInfo } from "net";
-import { io, Socket } from "socket.io-client";
-import { ClientEvents, ServerEvents } from "../../lib/events";
-import { expect } from "chai";
-
-const createPartialDone = (count: number, done: () => void) => {
-  let i = 0;
-  return () => {
-    if (++i === count) {
-      done();
-    }
-  };
-};
-
-describe("todo management", () => {
-  let httpServer: Server,
-    socket: Socket<ServerEvents, ClientEvents>,
-    otherSocket: Socket<ServerEvents, ClientEvents>,
-    todoRepository: TodoRepository;
-
-  beforeEach((done) => {
-    const partialDone = createPartialDone(2, done);
-
-    httpServer = createServer();
-    todoRepository = new InMemoryTodoRepository();
-
-    createApplication(httpServer, {
-      todoRepository,
-    });
-
-    httpServer.listen(() => {
-      const port = (httpServer.address() as AddressInfo).port;
-      socket = io(`http://localhost:${port}`);
-      socket.on("connect", partialDone);
-
-      otherSocket = io(`http://localhost:${port}`);
-      otherSocket.on("connect", partialDone);
-    });
-  });
-
-  afterEach(() => {
-    httpServer.close();
-    socket.disconnect();
-    otherSocket.disconnect();
-  });
-
-  describe("create todo", () => {
-    it("should create a todo entity", (done) => {
-      const partialDone = createPartialDone(2, done);
-
-      socket.emit(
-        "todo:create",
-        {
-          title: "lorem ipsum",
-          completed: false,
-        },
-        async (res) => {
-          if ("error" in res) {
-            return done(new Error("should not happen"));
-          }
-          expect(res.data).to.be.a("string");
-
-          const storedEntity = await todoRepository.findById(res.data);
-          expect(storedEntity).to.eql({
-            id: res.data,
-            title: "lorem ipsum",
-            completed: false,
-          });
-
-          partialDone();
-        }
-      );
-
-      otherSocket.on("todo:created", (todo) => {
-        expect(todo.id).to.be.a("string");
-        expect(todo.title).to.eql("lorem ipsum");
-        expect(todo.completed).to.eql(false);
-        partialDone();
-      });
-    });
-
-    it("should fail with an invalid entity", (done) => {
-      const incompleteTodo = {
-        completed: "false",
-        description: true,
-      };
-      // @ts-ignore
-      socket.emit("todo:create", incompleteTodo, (res) => {
-        if (!("error" in res)) {
-          return done(new Error("should not happen"));
-        }
-        expect(res.error).to.eql("invalid payload");
-        expect(res.errorDetails).to.eql([
-          {
-            message: '"title" is required',
-            path: ["title"],
-            type: "any.required",
-          },
-        ]);
-        done();
-      });
-
-      otherSocket.on("todo:created", () => {
-        done(new Error("should not happen"));
-      });
-    });
-  });
-
-  describe("read todo", () => {
-    it("should return a todo entity", (done) => {
-      todoRepository.save({
-        id: "254dbf85-f5b9-4675-b913-acab5d600884",
-        title: "lorem ipsum",
-        completed: true,
-      });
-
-      socket.emit(
-        "todo:read",
-        "254dbf85-f5b9-4675-b913-acab5d600884",
-        (res) => {
-          if ("error" in res) {
-            return done(new Error("should not happen"));
-          }
-          expect(res.data.id).to.eql("254dbf85-f5b9-4675-b913-acab5d600884");
-          expect(res.data.title).to.eql("lorem ipsum");
-          expect(res.data.completed).to.eql(true);
-          done();
-        }
-      );
-    });
-
-    it("should fail with an invalid ID", (done) => {
-      socket.emit("todo:read", "123", (res) => {
-        if ("error" in res) {
-          expect(res.error).to.eql("entity not found");
-          done();
-        } else {
-          done(new Error("should not happen"));
-        }
-      });
-    });
-
-    it("should fail with an unknown entity", (done) => {
-      socket.emit(
-        "todo:read",
-        "6edcf81e-7049-40e0-8497-9cdd52414f75",
-        (res) => {
-          if ("error" in res) {
-            expect(res.error).to.eql("entity not found");
-            done();
-          } else {
-            done(new Error("should not happen"));
-          }
-        }
-      );
-    });
-  });
-
-  describe("update todo", () => {
-    it("should update a todo entity", (done) => {
-      const partialDone = createPartialDone(2, done);
-
-      todoRepository.save({
-        id: "c7790b35-6bbb-45dd-8d67-a281ca407b43",
-        title: "lorem ipsum",
-        completed: true,
-      });
-
-      socket.emit(
-        "todo:update",
-        {
-          id: "c7790b35-6bbb-45dd-8d67-a281ca407b43",
-          title: "dolor sit amet",
-          completed: true,
-        },
-        async () => {
-          const storedEntity = await todoRepository.findById(
-            "c7790b35-6bbb-45dd-8d67-a281ca407b43"
-          );
-          expect(storedEntity).to.eql({
-            id: "c7790b35-6bbb-45dd-8d67-a281ca407b43",
-            title: "dolor sit amet",
-            completed: true,
-          });
-          partialDone();
-        }
-      );
-
-      otherSocket.on("todo:updated", (todo) => {
-        expect(todo.title).to.eql("dolor sit amet");
-        expect(todo.completed).to.eql(true);
-        partialDone();
-      });
-    });
-
-    it("should fail with an invalid entity", (done) => {
-      const incompleteTodo = {
-        id: "123",
-        completed: "false",
-        description: true,
-      };
-      // @ts-ignore
-      socket.emit("todo:update", incompleteTodo, (res) => {
-        if (!(res && "error" in res)) {
-          return done(new Error("should not happen"));
-        }
-        expect(res.error).to.eql("invalid payload");
-        expect(res.errorDetails).to.eql([
-          {
-            message: '"id" must be a valid GUID',
-            path: ["id"],
-            type: "string.guid",
-          },
-          {
-            message: '"title" is required',
-            path: ["title"],
-            type: "any.required",
-          },
-        ]);
-        done();
-      });
-
-      otherSocket.on("todo:updated", () => {
-        done(new Error("should not happen"));
-      });
-    });
-  });
-
-  describe("delete todo", () => {
-    it("should delete a todo entity", (done) => {
-      const partialDone = createPartialDone(2, done);
-      const id = "58960ab2-4e78-4ced-8079-134f12179d46";
-
-      todoRepository.save({
-        id,
-        title: "lorem ipsum",
-        completed: true,
-      });
-
-      socket.emit("todo:delete", id, async () => {
-        try {
-          await todoRepository.findById(id);
-        } catch (e) {
-          partialDone();
-        }
-      });
-
-      otherSocket.on("todo:deleted", (id) => {
-        expect(id).to.eql("58960ab2-4e78-4ced-8079-134f12179d46");
-        partialDone();
-      });
-    });
-
-    it("should fail with an invalid ID", (done) => {
-      socket.emit("todo:delete", "123", (res) => {
-        if (!(res && "error" in res)) {
-          return done(new Error("should not happen"));
-        }
-        expect(res.error).to.eql("entity not found");
-        done();
-      });
-
-      otherSocket.on("todo:deleted", () => {
-        done(new Error("should not happen"));
-      });
-    });
-  });
-
-  describe("list todo", () => {
-    it("should return a list of entities", (done) => {
-      todoRepository.save({
-        id: "d445db6d-9d55-4ff2-88ae-bd1f81c299d2",
-        title: "lorem ipsum",
-        completed: false,
-      });
-
-      todoRepository.save({
-        id: "5f56fb59-a887-4984-93bf-eb39b4170a35",
-        title: "dolor sit amet",
-        completed: true,
-      });
-
-      socket.emit("todo:list", (res) => {
-        if ("error" in res) {
-          return done(new Error("should not happen"));
-        }
-        expect(res.data).to.eql([
-          {
-            id: "d445db6d-9d55-4ff2-88ae-bd1f81c299d2",
-            title: "lorem ipsum",
-            completed: false,
-          },
-          {
-            id: "5f56fb59-a887-4984-93bf-eb39b4170a35",
-            title: "dolor sit amet",
-            completed: true,
-          },
-        ]);
-        done();
-      });
-    });
-  });
-});
--- a/examples/basic-crud-application/server/tsconfig.json
+++ b/examples/basic-crud-application/server/tsconfig.json
@@ -1,11 +0,0 @@
-{
-  "compilerOptions": {
-    "outDir": "./dist",
-    "module": "commonjs",
-    "target": "es2017",
-    "strict": true
-  },
-  "include": [
-    "./lib/**/*"
-  ]
-}
--- a/examples/chat/package-lock.json
+++ b/examples/chat/package-lock.json
@@ -0,0 +1,499 @@
+{
+  "name": "socket.io-chat",
+  "version": "0.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
+    "base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
+    },
+    "body-parser": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      }
+    },
+    "bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
+    },
+    "component-emitter": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
+    },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
+    },
+    "cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg=="
+    },
+    "cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
+    },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
+    },
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
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+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
+    },
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+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
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+    "encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
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+      "requires": {
+        "accepts": "~1.3.4",
+        "base64id": "2.0.0",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
+        "debug": "~4.1.0",
+        "engine.io-parser": "~4.0.0",
+        "ws": "^7.1.2"
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+      "dependencies": {
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+          "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA=="
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+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
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+          }
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+        "ms": {
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+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
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+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.1.tgz",
+      "integrity": "sha512-v5aZK1hlckcJDGmHz3W8xvI3NUHYc9t8QtTbqdR5OaH3S9iJZilPubauOm+vLWOMMWzpE3hiq92l9lTAHamRCg=="
+    },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
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+      "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
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+        "accepts": "~1.3.7",
+        "array-flatten": "1.1.1",
+        "body-parser": "1.19.0",
+        "content-disposition": "0.5.3",
+        "content-type": "~1.0.4",
+        "cookie": "0.4.0",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "~1.1.2",
+        "fresh": "0.5.2",
+        "merge-descriptors": "1.0.1",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "path-to-regexp": "0.1.7",
+        "proxy-addr": "~2.0.5",
+        "qs": "6.7.0",
+        "range-parser": "~1.2.1",
+        "safe-buffer": "5.1.2",
+        "send": "0.17.1",
+        "serve-static": "1.14.1",
+        "setprototypeof": "1.1.1",
+        "statuses": "~1.5.0",
+        "type-is": "~1.6.18",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
+      }
+    },
+    "finalhandler": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
+      "integrity": "sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==",
+      "requires": {
+        "debug": "2.6.9",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "statuses": "~1.5.0",
+        "unpipe": "~1.0.0"
+      }
+    },
+    "forwarded": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
+      "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
+    },
+    "fresh": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
+      "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
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+    "http-errors": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
+      "integrity": "sha512-uUQBt3H/cSIVfch6i1EuPNy/YsRSOUBXTVfZ+yR7Zjez3qjBz6i9+i4zjNaoqcoFVI4lQJ5plg63TvGfRSDCRg==",
+      "requires": {
+        "depd": "~1.1.2",
+        "inherits": "2.0.3",
+        "setprototypeof": "1.1.1",
+        "statuses": ">= 1.5.0 < 2",
+        "toidentifier": "1.0.0"
+      }
+    },
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+      "version": "0.4.24",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+      "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
+      "requires": {
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+      }
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+    },
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+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
+      "integrity": "sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g=="
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+      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
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+    "merge-descriptors": {
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+      "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
+      "integrity": "sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E="
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+      "integrity": "sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4="
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+    "mime": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg=="
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+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.43.0.tgz",
+      "integrity": "sha512-+5dsGEEovYbT8UY9yD7eE4XTc4UwJ1jBYlgaQQF38ENsKR3wj/8q8RFZrF9WIZpB2V1ArTVFUva8sAul1NzRzQ=="
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+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.26.tgz",
+      "integrity": "sha512-01paPWYgLrkqAyrlDorC1uDwl2p3qZT7yl806vW7DvDoxwXi46jsjFbg+WdwotBIk6/MbEhO/dh5aZ5sNj/dWQ==",
+      "requires": {
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+      }
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+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
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+        "escape-html": "~1.0.3",
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+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
+        "debug": "~4.1.0",
+        "engine.io": "~4.0.0",
+        "socket.io-adapter": "~2.0.3",
+        "socket.io-parser": "~4.0.1"
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+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
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+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
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+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "ws": {
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
+      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
+    }
+  }
+}
--- a/examples/chat/package.json
+++ b/examples/chat/package.json
@@ -8,7 +8,7 @@
  "license": "BSD",
  "dependencies": {
    "express": "~4.17.1",
-    "socket.io": "^4.0.0"
+    "socket.io": "^3.0.0"
  },
  "scripts": {
    "start": "node index.js"
--- a/examples/chat/public/main.js
+++ b/examples/chat/public/main.js
@@ -72,7 +72,7 @@ $(function() {
  }

  // Adds the visual chat message to the message list
-  const addChatMessage = (data, options = {}) => {
+  const addChatMessage = (data, options) => {
    // Don't fade the message in if there is an 'X was typing'
    const $typingMessages = getTypingMessages(data);
    if ($typingMessages.length !== 0) {
--- a/examples/cluster-haproxy/server/package.json
+++ b/examples/cluster-haproxy/server/package.json
@@ -8,7 +8,7 @@
  "license": "BSD",
  "dependencies": {
    "express": "4.13.4",
-    "socket.io": "^4.0.0",
+    "socket.io": "^3.1.0",
    "socket.io-redis": "^6.0.1"
  },
  "scripts": {
--- a/examples/cluster-httpd/server/package.json
+++ b/examples/cluster-httpd/server/package.json
@@ -8,7 +8,7 @@
  "license": "BSD",
  "dependencies": {
    "express": "4.13.4",
-    "socket.io": "^4.0.0",
+    "socket.io": "^3.1.0",
    "socket.io-redis": "^6.0.1"
  },
  "scripts": {
--- a/examples/cluster-nginx/client/package.json
+++ b/examples/cluster-nginx/client/package.json
@@ -7,7 +7,7 @@
  "private": true,
  "license": "MIT",
  "dependencies": {
-    "socket.io-client": "^4.0.0"
+    "socket.io-client": "^3.1.0"
  },
  "scripts": {
    "start": "node index.js"
--- a/examples/cluster-nginx/server/package.json
+++ b/examples/cluster-nginx/server/package.json
@@ -8,7 +8,7 @@
  "license": "MIT",
  "dependencies": {
    "express": "4.13.4",
-    "socket.io": "^4.0.0",
+    "socket.io": "^3.1.0",
    "socket.io-redis": "^6.0.1"
  },
  "scripts": {
--- a/examples/cluster-traefik/server/package.json
+++ b/examples/cluster-traefik/server/package.json
@@ -8,7 +8,7 @@
  "license": "MIT",
  "dependencies": {
    "express": "4.13.4",
-    "socket.io": "^4.0.0",
+    "socket.io": "^3.1.0",
    "socket.io-redis": "^6.0.1"
  },
  "scripts": {
--- a/examples/create-react-app-example/package.json
+++ b/examples/create-react-app-example/package.json
@@ -9,8 +9,8 @@
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-scripts": "3.4.1",
-    "socket.io": "4",
-    "socket.io-client": "4"
+    "socket.io": "^2.3.0",
+    "socket.io-client": "^2.3.0"
  },
  "scripts": {
    "start": "react-scripts start",
--- a/examples/create-react-app-example/server.js
+++ b/examples/create-react-app-example/server.js
@@ -1,8 +1,4 @@
-const io = require('socket.io')({
-  cors: {
-    origin: ['http://localhost:3000']
-  }
-});
+const io = require('socket.io')();

 io.on('connection', socket => {
  console.log(`connect: ${socket.id}`);
--- a/examples/create-react-app-example/yarn.lock
+++ b/examples/create-react-app-example/yarn.lock
--- a/examples/custom-parsers/package.json
+++ b/examples/custom-parsers/package.json
@@ -12,10 +12,10 @@
    "component-emitter": "^1.2.1",
    "express": "^4.15.2",
    "schemapack": "^1.4.2",
-    "socket.io": "^4.0.0",
-    "socket.io-client": "^4.0.0",
-    "socket.io-json-parser": "^3.0.0",
-    "socket.io-msgpack-parser": "^3.0.1",
+    "socket.io": "socketio/socket.io",
+    "socket.io-client": "socketio/socket.io-client",
+    "socket.io-json-parser": "^1.0.0",
+    "socket.io-msgpack-parser": "^1.0.0",
    "webpack": "^2.4.1"
  }
 }
--- a/examples/custom-parsers/public/.gitignore
+++ b/examples/custom-parsers/public/.gitignore
@@ -1 +0,0 @@
-*.bundle.js
--- a/examples/custom-parsers/src/custom-parser.js
+++ b/examples/custom-parsers/src/custom-parser.js
@@ -40,12 +40,12 @@ const errorPacket = {
 };

 class Encoder {
-  encode (packet) {
+  encode (packet, callback) {
    switch (packet.type) {
      case TYPES.EVENT:
-        return [ this.pack(packet) ];
+        return callback([ this.pack(packet) ]);
      default:
-        return [ JSON.stringify(packet) ];
+        return callback([ JSON.stringify(packet) ]);
    }
  }
  pack (packet) {
--- a/examples/custom-parsers/src/server.js
+++ b/examples/custom-parsers/src/server.js
@@ -14,22 +14,15 @@ const msgpackParser = require('socket.io-msgpack-parser');
 const jsonParser = require('socket.io-json-parser');
 const customParser = require('./custom-parser');

-const cors = {
-  origin: ["http://localhost:3000"]
-}
-
-let server1 = io(3001, { cors });
+let server1 = io(3001, {});
 let server2 = io(3002, {
-  parser: msgpackParser,
-  cors
+  parser: msgpackParser
 });
 let server3 = io(3003, {
-  parser: jsonParser,
-  cors
+  parser: jsonParser
 });
 let server4 = io(3004, {
-  parser: customParser,
-  cors
+  parser: customParser
 });

 let string = [];
--- a/examples/es-modules/package-lock.json
+++ b/examples/es-modules/package-lock.json
@@ -0,0 +1,217 @@
+{
+  "name": "es-modules",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@types/component-emitter": {
+      "version": "1.2.10",
+      "resolved": "https://registry.npmjs.org/@types/component-emitter/-/component-emitter-1.2.10.tgz",
+      "integrity": "sha512-bsjleuRKWmGqajMerkzox19aGbscQX5rmmvvXl3wlIp5gMG1HgkiwPxsN5p070fBDKTNSPgojVbuY1+HWMbFhg=="
+    },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "backo2": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
+      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
+    },
+    "base64-arraybuffer": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.4.tgz",
+      "integrity": "sha1-mBjHngWbE1X5fgQooBfIOOkLqBI="
+    },
+    "base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
+    },
+    "component-bind": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/component-bind/-/component-bind-1.0.0.tgz",
+      "integrity": "sha1-AMYIq33Nk4l8AAllGx06jh5zu9E="
+    },
+    "component-emitter": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
+    },
+    "cookie": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
+      "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA=="
+    },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
+    },
+    "debug": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+      "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+      "requires": {
+        "ms": "^2.1.1"
+      }
+    },
+    "engine.io": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-4.0.1.tgz",
+      "integrity": "sha512-6EaSBxasBUwxRdf6B68SEYpD3tcrG80J4YTzHl/D+9Q+vM0AMHZabfYcc2WdnvEaQxZjX/UZsa+UdGoM0qQQkQ==",
+      "requires": {
+        "accepts": "~1.3.4",
+        "base64id": "2.0.0",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
+        "debug": "~4.1.0",
+        "engine.io-parser": "~4.0.0",
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+        "socket.io-parser": "~4.0.1"
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+    },
+    "socket.io-client": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.0.tgz",
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+      "requires": {
+        "@types/component-emitter": "^1.2.10",
+        "backo2": "1.0.2",
+        "component-bind": "1.0.0",
+        "component-emitter": "~1.3.0",
+        "debug": "~4.1.0",
+        "engine.io-client": "~4.0.0",
+        "parseuri": "0.0.6",
+        "socket.io-parser": "~4.0.1"
+      }
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+    "socket.io-parser": {
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+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
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+        "debug": "~4.1.0"
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+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "ws": {
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
+      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
+    },
+    "xmlhttprequest-ssl": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
+      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
+    },
+    "yeast": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
+      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
+    }
+  }
+}
--- a/examples/es-modules/package.json
+++ b/examples/es-modules/package.json
@@ -9,7 +9,7 @@
    "node": ">=12.17.0"
  },
  "dependencies": {
-    "socket.io": "^4.0.0",
-    "socket.io-client": "^4.0.0"
+    "socket.io": "^3.0.0",
+    "socket.io-client": "^3.0.0"
  }
 }
--- a/examples/passport-example/index.js
+++ b/examples/passport-example/index.js
@@ -51,9 +51,9 @@ app.post(
 app.post("/logout", (req, res) => {
  console.log(`logout ${req.session.id}`);
  const socketId = req.session.socketId;
-  if (socketId && io.of("/").sockets.get(socketId)) {
+  if (socketId && io.of("/").connected[socketId]) {
    console.log(`forcefully closing socket ${socketId}`);
-    io.of("/").sockets.get(socketId).disconnect(true);
+    io.sockets.connected[socketId].disconnect(true);
  }
  req.logout();
  res.cookie("connect.sid", "", { expires: new Date() });
--- a/examples/passport-example/package-lock.json
+++ b/examples/passport-example/package-lock.json
@@ -0,0 +1,783 @@
+{
+  "name": "passport-example",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
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+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "after": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8="
+    },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
+    "arraybuffer.slice": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
+      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog=="
+    },
+    "async-limiter": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
+      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ=="
+    },
+    "backo2": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
+      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
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+      "integrity": "sha1-c5JncZI7Whl0etZmqlzUv5xunOg="
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+    },
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+      "integrity": "sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=",
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+      }
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+        "base64-arraybuffer": "0.1.5",
+        "component-bind": "1.0.0",
+        "component-emitter": "1.2.1",
+        "debug": "~4.1.0",
+        "engine.io-client": "~3.4.0",
+        "has-binary2": "~1.0.2",
+        "has-cors": "1.1.0",
+        "indexof": "0.0.1",
+        "object-component": "0.0.3",
+        "parseqs": "0.0.5",
+        "parseuri": "0.0.5",
+        "socket.io-parser": "~3.3.0",
+        "to-array": "0.1.4"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        },
+        "socket.io-parser": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.3.0.tgz",
+          "integrity": "sha512-hczmV6bDgdaEbVqhAeVMM/jfUfzuEZHsQg6eOmLgJht6G3mPKMxYm75w2+qhAQZ+4X+1+ATZ+QFKeOZD5riHng==",
+          "requires": {
+            "component-emitter": "1.2.1",
+            "debug": "~3.1.0",
+            "isarray": "2.0.1"
+          },
+          "dependencies": {
+            "debug": {
+              "version": "3.1.0",
+              "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+              "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+              "requires": {
+                "ms": "2.0.0"
+              }
+            },
+            "ms": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+            }
+          }
+        }
+      }
+    },
+    "socket.io-parser": {
+      "version": "3.4.1",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.4.1.tgz",
+      "integrity": "sha512-11hMgzL+WCLWf1uFtHSNvliI++tcRUWdoeYuwIl+Axvwy9z2gQM+7nJyN3STj1tLj5JyIUH8/gpDGxzAlDdi0A==",
+      "requires": {
+        "component-emitter": "1.2.1",
+        "debug": "~4.1.0",
+        "isarray": "2.0.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        }
+      }
+    },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
+    },
+    "to-array": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/to-array/-/to-array-0.1.4.tgz",
+      "integrity": "sha1-F+bBH3PdTz10zaek/zI46a2b+JA="
+    },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
+    },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
+    "uid-safe": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/uid-safe/-/uid-safe-2.1.5.tgz",
+      "integrity": "sha512-KPHm4VL5dDXKz01UuEd88Df+KzynaohSL9fBh096KWAxSKZQDI2uBrVqtvRM4rwrIrRRKsdLNML/lnaaVSRioA==",
+      "requires": {
+        "random-bytes": "~1.0.0"
+      }
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "ws": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.0.tgz",
+      "integrity": "sha512-iFtXzngZVXPGgpTlP1rBqsUK82p9tKqsWRPg5L56egiljujJT3vGAYnHANvFxBieXrTFavhzhxW52jnaWV+w2w=="
+    },
+    "xmlhttprequest-ssl": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
+      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
+    },
+    "yeast": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
+      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
+    }
+  }
+}
--- a/examples/passport-example/package.json
+++ b/examples/passport-example/package.json
@@ -8,7 +8,7 @@
    "express-session": "~1.17.1",
    "passport": "~0.4.1",
    "passport-local": "~1.0.0",
-    "socket.io": "^4.0.0"
+    "socket.io": "~2.3.0"
  },
  "scripts": {
    "start": "node index.js"
--- a/examples/private-messaging/package.json
+++ b/examples/private-messaging/package.json
@@ -8,18 +8,19 @@
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
-    "core-js": "^3.6.5",
+    "core-js": "^3.8.3",
    "socket.io-client": "^4.0.0",
-    "vue": "^2.6.11"
+    "vue": "^2.6.14"
  },
  "devDependencies": {
-    "@vue/cli-plugin-babel": "~4.5.0",
-    "@vue/cli-plugin-eslint": "~4.5.0",
-    "@vue/cli-service": "~4.5.0",
-    "babel-eslint": "^10.1.0",
-    "eslint": "^6.7.2",
-    "eslint-plugin-vue": "^6.2.2",
-    "vue-template-compiler": "^2.6.11"
+    "@babel/core": "^7.12.16",
+    "@babel/eslint-parser": "^7.12.16",
+    "@vue/cli-plugin-babel": "~5.0.0",
+    "@vue/cli-plugin-eslint": "~5.0.0",
+    "@vue/cli-service": "~5.0.0",
+    "eslint": "^7.32.0",
+    "eslint-plugin-vue": "^8.0.3",
+    "vue-template-compiler": "^2.6.14"
  },
  "eslintConfig": {
    "root": true,
@@ -31,9 +32,11 @@
      "eslint:recommended"
    ],
    "parserOptions": {
-      "parser": "babel-eslint"
+      "parser": "@babel/eslint-parser"
    },
-    "rules": {}
+    "rules": {
+      "vue/multi-word-component-names": "off"
+    }
  },
  "browserslist": [
    "> 1%",
--- a/examples/private-messaging/server/cluster.js
+++ b/examples/private-messaging/server/cluster.js
@@ -1,31 +0,0 @@
-const cluster = require("cluster");
-const http = require("http");
-const { setupMaster } = require("@socket.io/sticky");
-
-const WORKERS_COUNT = 4;
-
-if (cluster.isMaster) {
-  console.log(`Master ${process.pid} is running`);
-
-  for (let i = 0; i < WORKERS_COUNT; i++) {
-    cluster.fork();
-  }
-
-  cluster.on("exit", (worker) => {
-    console.log(`Worker ${worker.process.pid} died`);
-    cluster.fork();
-  });
-
-  const httpServer = http.createServer();
-  setupMaster(httpServer, {
-    loadBalancingMethod: "least-connection", // either "random", "round-robin" or "least-connection"
-  });
-  const PORT = process.env.PORT || 3000;
-
-  httpServer.listen(PORT, () =>
-    console.log(`server listening at http://localhost:${PORT}`)
-  );
-} else {
-  console.log(`Worker ${process.pid} started`);
-  require("./index");
-}
--- a/examples/private-messaging/server/docker-compose.yml
+++ b/examples/private-messaging/server/docker-compose.yml
@@ -1,7 +0,0 @@
-version: "3"
-
-services:
-  redis:
-    image: redis:5
-    ports:
-      - "6379:6379"
--- a/examples/private-messaging/server/index.js
+++ b/examples/private-messaging/server/index.js
@@ -1,125 +1,52 @@
 const httpServer = require("http").createServer();
-const Redis = require("ioredis");
-const redisClient = new Redis();
 const io = require("socket.io")(httpServer, {
  cors: {
    origin: "http://localhost:8080",
  },
-  adapter: require("socket.io-redis")({
-    pubClient: redisClient,
-    subClient: redisClient.duplicate(),
-  }),
 });

-const { setupWorker } = require("@socket.io/sticky");
-const crypto = require("crypto");
-const randomId = () => crypto.randomBytes(8).toString("hex");
-
-const { RedisSessionStore } = require("./sessionStore");
-const sessionStore = new RedisSessionStore(redisClient);
-
-const { RedisMessageStore } = require("./messageStore");
-const messageStore = new RedisMessageStore(redisClient);
-
-io.use(async (socket, next) => {
-  const sessionID = socket.handshake.auth.sessionID;
-  if (sessionID) {
-    const session = await sessionStore.findSession(sessionID);
-    if (session) {
-      socket.sessionID = sessionID;
-      socket.userID = session.userID;
-      socket.username = session.username;
-      return next();
-    }
-  }
+io.use((socket, next) => {
  const username = socket.handshake.auth.username;
  if (!username) {
    return next(new Error("invalid username"));
  }
-  socket.sessionID = randomId();
-  socket.userID = randomId();
  socket.username = username;
  next();
 });

-io.on("connection", async (socket) => {
-  // persist session
-  sessionStore.saveSession(socket.sessionID, {
-    userID: socket.userID,
-    username: socket.username,
-    connected: true,
-  });
-
-  // emit session details
-  socket.emit("session", {
-    sessionID: socket.sessionID,
-    userID: socket.userID,
-  });
-
-  // join the "userID" room
-  socket.join(socket.userID);
-
+io.on("connection", (socket) => {
  // fetch existing users
  const users = [];
-  const [messages, sessions] = await Promise.all([
-    messageStore.findMessagesForUser(socket.userID),
-    sessionStore.findAllSessions(),
-  ]);
-  const messagesPerUser = new Map();
-  messages.forEach((message) => {
-    const { from, to } = message;
-    const otherUser = socket.userID === from ? to : from;
-    if (messagesPerUser.has(otherUser)) {
-      messagesPerUser.get(otherUser).push(message);
-    } else {
-      messagesPerUser.set(otherUser, [message]);
-    }
-  });
-
-  sessions.forEach((session) => {
+  for (let [id, socket] of io.of("/").sockets) {
    users.push({
-      userID: session.userID,
-      username: session.username,
-      connected: session.connected,
-      messages: messagesPerUser.get(session.userID) || [],
+      userID: id,
+      username: socket.username,
    });
-  });
+  }
  socket.emit("users", users);

  // notify existing users
  socket.broadcast.emit("user connected", {
-    userID: socket.userID,
+    userID: socket.id,
    username: socket.username,
-    connected: true,
-    messages: [],
  });

-  // forward the private message to the right recipient (and to other tabs of the sender)
+  // forward the private message to the right recipient
  socket.on("private message", ({ content, to }) => {
-    const message = {
+    socket.to(to).emit("private message", {
      content,
-      from: socket.userID,
-      to,
-    };
-    socket.to(to).to(socket.userID).emit("private message", message);
-    messageStore.saveMessage(message);
+      from: socket.id,
+    });
  });

  // notify users upon disconnection
-  socket.on("disconnect", async () => {
-    const matchingSockets = await io.in(socket.userID).allSockets();
-    const isDisconnected = matchingSockets.size === 0;
-    if (isDisconnected) {
-      // notify other users
-      socket.broadcast.emit("user disconnected", socket.userID);
-      // update the connection status of the session
-      sessionStore.saveSession(socket.sessionID, {
-        userID: socket.userID,
-        username: socket.username,
-        connected: false,
-      });
-    }
+  socket.on("disconnect", () => {
+    socket.broadcast.emit("user disconnected", socket.id);
  });
 });

-setupWorker(io);
+const PORT = process.env.PORT || 3000;
+
+httpServer.listen(PORT, () =>
+  console.log(`server listening at http://localhost:${PORT}`)
+);
--- a/examples/private-messaging/server/messageStore.js
+++ b/examples/private-messaging/server/messageStore.js
@@ -1,54 +0,0 @@
-/* abstract */ class MessageStore {
-  saveMessage(message) {}
-  findMessagesForUser(userID) {}
-}
-
-class InMemoryMessageStore extends MessageStore {
-  constructor() {
-    super();
-    this.messages = [];
-  }
-
-  saveMessage(message) {
-    this.messages.push(message);
-  }
-
-  findMessagesForUser(userID) {
-    return this.messages.filter(
-      ({ from, to }) => from === userID || to === userID
-    );
-  }
-}
-
-const CONVERSATION_TTL = 24 * 60 * 60;
-
-class RedisMessageStore extends MessageStore {
-  constructor(redisClient) {
-    super();
-    this.redisClient = redisClient;
-  }
-
-  saveMessage(message) {
-    const value = JSON.stringify(message);
-    this.redisClient
-      .multi()
-      .rpush(`messages:${message.from}`, value)
-      .rpush(`messages:${message.to}`, value)
-      .expire(`messages:${message.from}`, CONVERSATION_TTL)
-      .expire(`messages:${message.to}`, CONVERSATION_TTL)
-      .exec();
-  }
-
-  findMessagesForUser(userID) {
-    return this.redisClient
-      .lrange(`messages:${userID}`, 0, -1)
-      .then((results) => {
-        return results.map((result) => JSON.parse(result));
-      });
-  }
-}
-
-module.exports = {
-  InMemoryMessageStore,
-  RedisMessageStore,
-};
--- a/examples/private-messaging/server/package.json
+++ b/examples/private-messaging/server/package.json
@@ -4,14 +4,11 @@
  "description": "",
  "main": "index.js",
  "scripts": {
-    "start": "node cluster.js"
+    "start": "node index.js"
  },
  "author": "Damien Arrachequesne <damien.arrachequesne@gmail.com>",
  "license": "MIT",
  "dependencies": {
-    "@socket.io/sticky": "^1.0.0",
-    "ioredis": "^4.22.0",
-    "socket.io": "^4.0.0",
-    "socket.io-redis": "^6.0.1"
+    "socket.io": "^3.1.1"
  }
 }
--- a/examples/private-messaging/server/sessionStore.js
+++ b/examples/private-messaging/server/sessionStore.js
@@ -1,89 +0,0 @@
-/* abstract */ class SessionStore {
-  findSession(id) {}
-  saveSession(id, session) {}
-  findAllSessions() {}
-}
-
-class InMemorySessionStore extends SessionStore {
-  constructor() {
-    super();
-    this.sessions = new Map();
-  }
-
-  findSession(id) {
-    return this.sessions.get(id);
-  }
-
-  saveSession(id, session) {
-    this.sessions.set(id, session);
-  }
-
-  findAllSessions() {
-    return [...this.sessions.values()];
-  }
-}
-
-const SESSION_TTL = 24 * 60 * 60;
-const mapSession = ([userID, username, connected]) =>
-  userID ? { userID, username, connected: connected === "true" } : undefined;
-
-class RedisSessionStore extends SessionStore {
-  constructor(redisClient) {
-    super();
-    this.redisClient = redisClient;
-  }
-
-  findSession(id) {
-    return this.redisClient
-      .hmget(`session:${id}`, "userID", "username", "connected")
-      .then(mapSession);
-  }
-
-  saveSession(id, { userID, username, connected }) {
-    this.redisClient
-      .multi()
-      .hset(
-        `session:${id}`,
-        "userID",
-        userID,
-        "username",
-        username,
-        "connected",
-        connected
-      )
-      .expire(`session:${id}`, SESSION_TTL)
-      .exec();
-  }
-
-  async findAllSessions() {
-    const keys = new Set();
-    let nextIndex = 0;
-    do {
-      const [nextIndexAsStr, results] = await this.redisClient.scan(
-        nextIndex,
-        "MATCH",
-        "session:*",
-        "COUNT",
-        "100"
-      );
-      nextIndex = parseInt(nextIndexAsStr, 10);
-      results.forEach((s) => keys.add(s));
-    } while (nextIndex !== 0);
-    const commands = [];
-    keys.forEach((key) => {
-      commands.push(["hmget", key, "userID", "username", "connected"]);
-    });
-    return this.redisClient
-      .multi(commands)
-      .exec()
-      .then((results) => {
-        return results
-          .map(([err, session]) => (err ? undefined : mapSession(session)))
-          .filter((v) => !!v);
-      });
-  }
-}
-module.exports = {
-  InMemorySessionStore,
-  RedisSessionStore,
-};
--- a/examples/private-messaging/src/App.vue
+++ b/examples/private-messaging/src/App.vue
@@ -32,23 +32,6 @@ export default {
    },
  },
  created() {
-    const sessionID = localStorage.getItem("sessionID");
-
-    if (sessionID) {
-      this.usernameAlreadySelected = true;
-      socket.auth = { sessionID };
-      socket.connect();
-    }
-
-    socket.on("session", ({ sessionID, userID }) => {
-      // attach the session ID to the next reconnection attempts
-      socket.auth = { sessionID };
-      // store it in the localStorage
-      localStorage.setItem("sessionID", sessionID);
-      // save the ID of the user
-      socket.userID = userID;
-    });
-
    socket.on("connect_error", (err) => {
      if (err.message === "invalid username") {
        this.usernameAlreadySelected = false;
@@ -68,7 +51,7 @@ body {

@font-face {
  font-family: Lato;
-  src: url("/fonts/Lato-Regular.ttf");
+  src: "~/public/fonts/Lato-Regular.ttf";
 }

 #app {
--- a/examples/private-messaging/src/components/Chat.vue
+++ b/examples/private-messaging/src/components/Chat.vue
@@ -68,28 +68,18 @@ export default {
    });

    const initReactiveProperties = (user) => {
+      user.connected = true;
+      user.messages = [];
      user.hasNewMessages = false;
    };

    socket.on("users", (users) => {
      users.forEach((user) => {
-        user.messages.forEach((message) => {
-          message.fromSelf = message.from === socket.userID;
-        });
-        for (let i = 0; i < this.users.length; i++) {
-          const existingUser = this.users[i];
-          if (existingUser.userID === user.userID) {
-            existingUser.connected = user.connected;
-            existingUser.messages = user.messages;
-            return;
-          }
-        }
-        user.self = user.userID === socket.userID;
+        user.self = user.userID === socket.id;
        initReactiveProperties(user);
-        this.users.push(user);
      });
      // put the current user first, and sort by username
-      this.users.sort((a, b) => {
+      this.users = users.sort((a, b) => {
        if (a.self) return -1;
        if (b.self) return 1;
        if (a.username < b.username) return -1;
@@ -98,13 +88,6 @@ export default {
    });

    socket.on("user connected", (user) => {
-      for (let i = 0; i < this.users.length; i++) {
-        const existingUser = this.users[i];
-        if (existingUser.userID === user.userID) {
-          existingUser.connected = true;
-          return;
-        }
-      }
      initReactiveProperties(user);
      this.users.push(user);
    });
@@ -119,14 +102,13 @@ export default {
      }
    });

-    socket.on("private message", ({ content, from, to }) => {
+    socket.on("private message", ({ content, from }) => {
      for (let i = 0; i < this.users.length; i++) {
        const user = this.users[i];
-        const fromSelf = socket.userID === from;
-        if (user.userID === (fromSelf ? to : from)) {
+        if (user.userID === from) {
          user.messages.push({
            content,
-            fromSelf,
+            fromSelf: false,
          });
          if (user !== this.selectedUser) {
            user.hasNewMessages = true;
--- a/examples/react-native/package-lock.json
+++ b/examples/react-native/package-lock.json
--- a/examples/react-native/package.json
+++ b/examples/react-native/package.json
@@ -13,8 +13,8 @@
    "react-dom": "~16.9.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-37.0.1.tar.gz",
    "react-native-web": "~0.11.7",
-    "socket.io": "^4.0.0",
-    "socket.io-client": "^4.0.0"
+    "socket.io": "^3.0.1",
+    "socket.io-client": "^3.0.1"
  },
  "devDependencies": {
    "babel-preset-expo": "~8.1.0",
--- a/examples/tweet-stream/index.js
+++ b/examples/tweet-stream/index.js
@@ -7,11 +7,7 @@ const twitter = new Twitter({
  token_secret: process.env.TWITTER_TOKEN_SECRET
 });

-const io = require('socket.io')(process.env.PORT || 3000, {
-  cors: {
-    origin: true
-  }
-});
+const io = require('socket.io')(process.env.PORT || 3000);

 twitter.track('socket.io');
 twitter.track('javascript');
--- a/examples/tweet-stream/package-lock.json
+++ b/examples/tweet-stream/package-lock.json
@@ -0,0 +1,705 @@
+{
+  "name": "socket.io-tweet-stream",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
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+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
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+    "after": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8="
+    },
+    "ajv": {
+      "version": "6.12.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.0.tgz",
+      "integrity": "sha512-D6gFiFA0RRLyUbvijN74DWAjXSFxWKaWP7mldxkVhyhAV3+SWA9HEJPHQ2c9soIeTFJqcSdFDGFgdqs1iUU2Hw==",
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
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+    "arraybuffer.slice": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
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+}
--- a/examples/tweet-stream/package.json
+++ b/examples/tweet-stream/package.json
@@ -15,6 +15,6 @@
  "license": "MIT",
  "dependencies": {
    "node-tweet-stream": "^2.0.1",
-    "socket.io": "^4.0.0"
+    "socket.io": "~2.3.0"
  }
 }
--- a/examples/typescript/package-lock.json
+++ b/examples/typescript/package-lock.json
@@ -0,0 +1,295 @@
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+        "xmlhttprequest-ssl": "~1.5.4",
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+    },
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+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-3.0.4.tgz",
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+      "requires": {
+        "@types/cookie": "^0.4.0",
+        "@types/cors": "^2.8.8",
+        "@types/node": "^14.14.7",
+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
+        "debug": "~4.1.0",
+        "engine.io": "~4.0.0",
+        "socket.io-adapter": "~2.0.3",
+        "socket.io-parser": "~4.0.1"
+      }
+    },
+    "socket.io-adapter": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.0.3.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.4.tgz",
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+        "backo2": "1.0.2",
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+        "component-emitter": "~1.3.0",
+        "debug": "~4.1.0",
+        "engine.io-client": "~4.0.0",
+        "parseuri": "0.0.6",
+        "socket.io-parser": "~4.0.1"
+      }
+    },
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+      "requires": {
+        "@types/component-emitter": "^1.2.10",
+        "component-emitter": "~1.3.0",
+        "debug": "~4.1.0"
+      }
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+    },
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+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
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+      "requires": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      }
+    },
+    "ts-node": {
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-9.0.0.tgz",
+      "integrity": "sha512-/TqB4SnererCDR/vb4S/QvSZvzQMJN8daAslg7MeaiHvD8rDZsSfXmNeNumyZZzMned72Xoq/isQljYSt8Ynfg==",
+      "requires": {
+        "arg": "^4.1.0",
+        "diff": "^4.0.1",
+        "make-error": "^1.1.1",
+        "source-map-support": "^0.5.17",
+        "yn": "3.1.1"
+      }
+    },
+    "typescript": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.5.tgz",
+      "integrity": "sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ=="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "ws": {
+      "version": "7.4.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.2.tgz",
+      "integrity": "sha512-T4tewALS3+qsrpGI/8dqNMLIVdq/g/85U98HPMa6F0m6xTbvhXU6RCQLqPH3+SlomNV/LdY6RXEbBpMH6EOJnA=="
+    },
+    "xmlhttprequest-ssl": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
+      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
+    },
+    "yeast": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
+      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q=="
+    }
+  }
+}
--- a/examples/typescript/package.json
+++ b/examples/typescript/package.json
@@ -11,8 +11,8 @@
  "author": "Damien Arrachequesne",
  "license": "MIT",
  "dependencies": {
-    "socket.io": "^4.0.0",
-    "socket.io-client": "^4.0.0",
+    "socket.io": "^3.0.4",
+    "socket.io-client": "^3.0.4",
    "ts-node": "^9.0.0",
    "typescript": "^4.0.5"
  }
--- a/examples/typescript/server.ts
+++ b/examples/typescript/server.ts
@@ -1,8 +1,8 @@
-import { Server } from "socket.io";
+import { Server, Socket } from "socket.io";

 const io = new Server(8080);

-io.on("connect", (socket) => {
+io.on("connect", (socket: Socket) => {
    console.log(`connect ${socket.id}`);

    socket.on("ping", (cb) => {
--- a/examples/webpack-build-server/lib/index.js
+++ b/examples/webpack-build-server/lib/index.js
@@ -1,7 +1,8 @@

 const server = require('http').createServer();
 const io = require('socket.io')(server, {
-  serveClient: false
+  serveClient: false,
+  wsEngine: 'ws' // uws is not supported since it is a native module
 });
 const port = process.env.PORT || 3000;

--- a/examples/webpack-build-server/package-lock.json
+++ b/examples/webpack-build-server/package-lock.json
--- a/examples/webpack-build-server/package.json
+++ b/examples/webpack-build-server/package.json
@@ -9,7 +9,7 @@
  "author": "Damien Arrachequesne",
  "license": "MIT",
  "devDependencies": {
-    "socket.io": "^4.0.0",
+    "socket.io": "~2.3.0",
    "webpack": "~4.43.0",
    "webpack-cli": "~3.3.11"
  }
--- a/examples/webpack-build-server/support/webpack.config.js
+++ b/examples/webpack-build-server/support/webpack.config.js
@@ -5,6 +5,5 @@ module.exports = {
  output: {
    path: require('path').join(__dirname, '../dist'),
    filename: 'server.js'
-  },
-  mode: 'production'
+  }
 };
--- a/examples/whiteboard/package-lock.json
+++ b/examples/whiteboard/package-lock.json
@@ -0,0 +1,499 @@
+{
+  "name": "whiteboard",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
+    "base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
+    },
+    "body-parser": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      }
+    },
+    "bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
+    },
+    "component-emitter": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
+    },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "requires": {
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+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
+    },
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+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
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+    },
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+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
+    },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
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+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
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+      "requires": {
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+      }
+    },
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+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
+    },
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+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
+    },
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+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
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+      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
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+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-4.0.1.tgz",
+      "integrity": "sha512-6EaSBxasBUwxRdf6B68SEYpD3tcrG80J4YTzHl/D+9Q+vM0AMHZabfYcc2WdnvEaQxZjX/UZsa+UdGoM0qQQkQ==",
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+        "accepts": "~1.3.4",
+        "base64id": "2.0.0",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
+        "debug": "~4.1.0",
+        "engine.io-parser": "~4.0.0",
+        "ws": "^7.1.2"
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+  }
+}
--- a/examples/whiteboard/package.json
+++ b/examples/whiteboard/package.json
@@ -9,7 +9,7 @@
  ],
  "dependencies": {
    "express": "~4.17.1",
-    "socket.io": "^4.0.0"
+    "socket.io": "^3.0.0"
  },
  "scripts": {
    "start": "node index"
--- a/lib/broadcast-operator.ts
+++ b/lib/broadcast-operator.ts
@@ -1,315 +0,0 @@
-import type { BroadcastFlags, Room, SocketId } from "socket.io-adapter";
-import { Handshake, RESERVED_EVENTS, Socket } from "./socket";
-import { PacketType } from "socket.io-parser";
-import type { Adapter } from "socket.io-adapter";
-import type {
-  EventParams,
-  EventNames,
-  EventsMap,
-  TypedEventBroadcaster,
-} from "./typed-events";
-
-export class BroadcastOperator<EmitEvents extends EventsMap>
-  implements TypedEventBroadcaster<EmitEvents> {
-  constructor(
-    private readonly adapter: Adapter,
-    private readonly rooms: Set<Room> = new Set<Room>(),
-    private readonly exceptRooms: Set<Room> = new Set<Room>(),
-    private readonly flags: BroadcastFlags = {}
-  ) {}
-
-  /**
-   * Targets a room when emitting.
-   *
-   * @param room
-   * @return a new BroadcastOperator instance
-   * @public
-   */
-  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    const rooms = new Set(this.rooms);
-    if (Array.isArray(room)) {
-      room.forEach((r) => rooms.add(r));
-    } else {
-      rooms.add(room);
-    }
-    return new BroadcastOperator(
-      this.adapter,
-      rooms,
-      this.exceptRooms,
-      this.flags
-    );
-  }
-
-  /**
-   * Targets a room when emitting.
-   *
-   * @param room
-   * @return a new BroadcastOperator instance
-   * @public
-   */
-  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    return this.to(room);
-  }
-
-  /**
-   * Excludes a room when emitting.
-   *
-   * @param room
-   * @return a new BroadcastOperator instance
-   * @public
-   */
-  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    const exceptRooms = new Set(this.exceptRooms);
-    if (Array.isArray(room)) {
-      room.forEach((r) => exceptRooms.add(r));
-    } else {
-      exceptRooms.add(room);
-    }
-    return new BroadcastOperator(
-      this.adapter,
-      this.rooms,
-      exceptRooms,
-      this.flags
-    );
-  }
-
-  /**
-   * Sets the compress flag.
-   *
-   * @param compress - if `true`, compresses the sending data
-   * @return a new BroadcastOperator instance
-   * @public
-   */
-  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
-    const flags = Object.assign({}, this.flags, { compress });
-    return new BroadcastOperator(
-      this.adapter,
-      this.rooms,
-      this.exceptRooms,
-      flags
-    );
-  }
-
-  /**
-   * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
-   * receive messages (because of network slowness or other issues, or because they’re connected through long polling
-   * and is in the middle of a request-response cycle).
-   *
-   * @return a new BroadcastOperator instance
-   * @public
-   */
-  public get volatile(): BroadcastOperator<EmitEvents> {
-    const flags = Object.assign({}, this.flags, { volatile: true });
-    return new BroadcastOperator(
-      this.adapter,
-      this.rooms,
-      this.exceptRooms,
-      flags
-    );
-  }
-
-  /**
-   * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
-   *
-   * @return a new BroadcastOperator instance
-   * @public
-   */
-  public get local(): BroadcastOperator<EmitEvents> {
-    const flags = Object.assign({}, this.flags, { local: true });
-    return new BroadcastOperator(
-      this.adapter,
-      this.rooms,
-      this.exceptRooms,
-      flags
-    );
-  }
-
-  /**
-   * Emits to all clients.
-   *
-   * @return Always true
-   * @public
-   */
-  public emit<Ev extends EventNames<EmitEvents>>(
-    ev: Ev,
-    ...args: EventParams<EmitEvents, Ev>
-  ): boolean {
-    if (RESERVED_EVENTS.has(ev)) {
-      throw new Error(`"${ev}" is a reserved event name`);
-    }
-    // set up packet object
-    const data = [ev, ...args];
-    const packet = {
-      type: PacketType.EVENT,
-      data: data,
-    };
-
-    if ("function" == typeof data[data.length - 1]) {
-      throw new Error("Callbacks are not supported when broadcasting");
-    }
-
-    this.adapter.broadcast(packet, {
-      rooms: this.rooms,
-      except: this.exceptRooms,
-      flags: this.flags,
-    });
-
-    return true;
-  }
-
-  /**
-   * Gets a list of clients.
-   *
-   * @public
-   */
-  public allSockets(): Promise<Set<SocketId>> {
-    if (!this.adapter) {
-      throw new Error(
-        "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
-      );
-    }
-    return this.adapter.sockets(this.rooms);
-  }
-
-  /**
-   * Returns the matching socket instances
-   *
-   * @public
-   */
-  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
-    return this.adapter
-      .fetchSockets({
-        rooms: this.rooms,
-        except: this.exceptRooms,
-      })
-      .then((sockets) => {
-        return sockets.map((socket) => {
-          if (socket instanceof Socket) {
-            // FIXME the TypeScript compiler complains about missing private properties
-            return (socket as unknown) as RemoteSocket<EmitEvents>;
-          } else {
-            return new RemoteSocket(this.adapter, socket as SocketDetails);
-          }
-        });
-      });
-  }
-
-  /**
-   * Makes the matching socket instances join the specified rooms
-   *
-   * @param room
-   * @public
-   */
-  public socketsJoin(room: Room | Room[]): void {
-    this.adapter.addSockets(
-      {
-        rooms: this.rooms,
-        except: this.exceptRooms,
-      },
-      Array.isArray(room) ? room : [room]
-    );
-  }
-
-  /**
-   * Makes the matching socket instances leave the specified rooms
-   *
-   * @param room
-   * @public
-   */
-  public socketsLeave(room: Room | Room[]): void {
-    this.adapter.delSockets(
-      {
-        rooms: this.rooms,
-        except: this.exceptRooms,
-      },
-      Array.isArray(room) ? room : [room]
-    );
-  }
-
-  /**
-   * Makes the matching socket instances disconnect
-   *
-   * @param close - whether to close the underlying connection
-   * @public
-   */
-  public disconnectSockets(close: boolean = false): void {
-    this.adapter.disconnectSockets(
-      {
-        rooms: this.rooms,
-        except: this.exceptRooms,
-      },
-      close
-    );
-  }
-}
-
-/**
- * Format of the data when the Socket instance exists on another Socket.IO server
- */
-interface SocketDetails {
-  id: SocketId;
-  handshake: Handshake;
-  rooms: Room[];
-  data: any;
-}
-
-/**
- * Expose of subset of the attributes and methods of the Socket class
- */
-export class RemoteSocket<EmitEvents extends EventsMap>
-  implements TypedEventBroadcaster<EmitEvents> {
-  public readonly id: SocketId;
-  public readonly handshake: Handshake;
-  public readonly rooms: Set<Room>;
-  public readonly data: any;
-
-  private readonly operator: BroadcastOperator<EmitEvents>;
-
-  constructor(adapter: Adapter, details: SocketDetails) {
-    this.id = details.id;
-    this.handshake = details.handshake;
-    this.rooms = new Set(details.rooms);
-    this.data = details.data;
-    this.operator = new BroadcastOperator(adapter, new Set([this.id]));
-  }
-
-  public emit<Ev extends EventNames<EmitEvents>>(
-    ev: Ev,
-    ...args: EventParams<EmitEvents, Ev>
-  ): boolean {
-    return this.operator.emit(ev, ...args);
-  }
-
-  /**
-   * Joins a room.
-   *
-   * @param {String|Array} room - room or array of rooms
-   * @public
-   */
-  public join(room: Room | Room[]): void {
-    return this.operator.socketsJoin(room);
-  }
-
-  /**
-   * Leaves a room.
-   *
-   * @param {String} room
-   * @public
-   */
-  public leave(room: Room): void {
-    return this.operator.socketsLeave(room);
-  }
-
-  /**
-   * Disconnects this client.
-   *
-   * @param {Boolean} close - if `true`, closes the underlying connection
-   * @return {Socket} self
-   *
-   * @public
-   */
-  public disconnect(close = false): this {
-    this.operator.disconnectSockets(close);
-    return this;
-  }
-}
--- a/lib/client.ts
+++ b/lib/client.ts
@@ -2,40 +2,21 @@ import { Decoder, Encoder, Packet, PacketType } from "socket.io-parser";
 import debugModule = require("debug");
 import url = require("url");
 import type { IncomingMessage } from "http";
-import type { Server } from "./index";
-import type { Namespace } from "./namespace";
-import type { EventsMap } from "./typed-events";
+import type { Namespace, Server } from "./index";
 import type { Socket } from "./socket";
 import type { SocketId } from "socket.io-adapter";

 const debug = debugModule("socket.io:client");

-interface WriteOptions {
-  compress?: boolean;
-  volatile?: boolean;
-  preEncoded?: boolean;
-  wsPreEncoded?: string;
-}
-
-export class Client<
-  ListenEvents extends EventsMap,
-  EmitEvents extends EventsMap,
-  ServerSideEvents extends EventsMap
-> {
+export class Client {
  public readonly conn;

  private readonly id: string;
-  private readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>;
+  private readonly server: Server;
  private readonly encoder: Encoder;
  private readonly decoder: Decoder;
-  private sockets: Map<
-    SocketId,
-    Socket<ListenEvents, EmitEvents, ServerSideEvents>
-  > = new Map();
-  private nsps: Map<
-    string,
-    Socket<ListenEvents, EmitEvents, ServerSideEvents>
-  > = new Map();
+  private sockets: Map<SocketId, Socket> = new Map();
+  private nsps: Map<string, Socket> = new Map();
  private connectTimeout?: NodeJS.Timeout;

  /**
@@ -45,10 +26,7 @@ export class Client<
   * @param conn
   * @package
   */
-  constructor(
-    server: Server<ListenEvents, EmitEvents, ServerSideEvents>,
-    conn: any
-  ) {
+  constructor(server: Server, conn: Socket) {
    this.server = server;
    this.conn = conn;
    this.encoder = server.encoder;
@@ -109,11 +87,7 @@ export class Client<
    this.server._checkNamespace(
      name,
      auth,
-      (
-        dynamicNspName:
-          | Namespace<ListenEvents, EmitEvents, ServerSideEvents>
-          | false
-      ) => {
+      (dynamicNspName: Namespace | false) => {
        if (dynamicNspName) {
          debug("dynamic namespace %s was created", dynamicNspName);
          this.doConnect(name, auth);
@@ -171,7 +145,7 @@ export class Client<
   *
   * @private
   */
-  _remove(socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>): void {
+  _remove(socket: Socket): void {
    if (this.sockets.has(socket.id)) {
      const nsp = this.sockets.get(socket.id)!.nsp.name;
      this.sockets.delete(socket.id);
@@ -201,30 +175,31 @@ export class Client<
   * @param {Object} opts
   * @private
   */
-  _packet(packet: Packet | any[], opts: WriteOptions = {}): void {
-    if (this.conn.readyState !== "open") {
-      debug("ignoring packet write %j", packet);
-      return;
-    }
-    const encodedPackets = opts.preEncoded
-      ? (packet as any[]) // previous versions of the adapter incorrectly used socket.packet() instead of writeToEngine()
-      : this.encoder.encode(packet as Packet);
-    for (const encodedPacket of encodedPackets) {
-      this.writeToEngine(encodedPacket, opts);
-    }
-  }
+  _packet(packet: Packet, opts?: any): void {
+    opts = opts || {};
+    const self = this;

-  private writeToEngine(
-    encodedPacket: String | Buffer,
-    opts: WriteOptions
-  ): void {
-    if (opts.volatile && !this.conn.transport.writable) {
-      debug(
-        "volatile packet is discarded since the transport is not currently writable"
-      );
-      return;
+    // this writes to the actual connection
+    function writeToEngine(encodedPackets: any) {
+      // TODO clarify this.
+      if (opts.volatile && !self.conn.transport.writable) return;
+      for (let i = 0; i < encodedPackets.length; i++) {
+        self.conn.write(encodedPackets[i], { compress: opts.compress });
+      }
+    }
+
+    if ("open" === this.conn.readyState) {
+      debug("writing packet %j", packet);
+      if (!opts.preEncoded) {
+        // not broadcasting, need to encode
+        writeToEngine(this.encoder.encode(packet)); // encode, then write results to engine
+      } else {
+        // a broadcast pre-encodes a packet
+        writeToEngine(packet);
+      }
+    } else {
+      debug("ignoring packet write %j", packet);
    }
-    this.conn.write(encodedPacket, opts);
  }

  /**
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -7,7 +7,7 @@ import path = require("path");
 import engine = require("engine.io");
 import { Client } from "./client";
 import { EventEmitter } from "events";
-import { ExtendedError, Namespace, ServerReservedEventsMap } from "./namespace";
+import { ExtendedError, Namespace } from "./namespace";
 import { ParentNamespace } from "./parent-namespace";
 import { Adapter, Room, SocketId } from "socket.io-adapter";
 import * as parser from "socket.io-parser";
@@ -16,14 +16,6 @@ import debugModule from "debug";
 import { Socket } from "./socket";
 import type { CookieSerializeOptions } from "cookie";
 import type { CorsOptions } from "cors";
-import type { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
-import {
-  EventsMap,
-  DefaultEventsMap,
-  EventParams,
-  StrictEventEmitter,
-  EventNames,
-} from "./typed-events";

 const debug = debugModule("socket.io:server");

@@ -37,12 +29,10 @@ type ParentNspNameMatchFn = (
  fn: (err: Error | null, success: boolean) => void
 ) => void;

-type AdapterConstructor = typeof Adapter | ((nsp: Namespace) => Adapter);
-
 interface EngineOptions {
  /**
   * how many ms without a pong packet to consider the connection closed
-   * @default 20000
+   * @default 5000
   */
  pingTimeout: number;
  /**
@@ -92,12 +82,10 @@ interface EngineOptions {
  httpCompression: boolean | object;
  /**
   * what WebSocket server implementation to use. Specified module must
-   * conform to the ws interface (see ws module api docs).
-   * An alternative c++ addon is also available by installing eiows module.
-   *
-   * @default `require("ws").Server`
+   * conform to the ws interface (see ws module api docs). Default value is ws.
+   * An alternative c++ addon is also available by installing uws module.
   */
-  wsEngine: Function;
+  wsEngine: string;
  /**
   * an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
   */
@@ -154,7 +142,7 @@ interface ServerOptions extends EngineAttachOptions {
   * the adapter to use
   * @default the in-memory adapter (https://github.com/socketio/socket.io-adapter)
   */
-  adapter: AdapterConstructor;
+  adapter: any;
  /**
   * the parser to use
   * @default the default parser (https://github.com/socketio/socket.io-parser)
@@ -167,31 +155,8 @@ interface ServerOptions extends EngineAttachOptions {
  connectTimeout: number;
 }

-export class Server<
-  ListenEvents extends EventsMap = DefaultEventsMap,
-  EmitEvents extends EventsMap = ListenEvents,
-  ServerSideEvents extends EventsMap = DefaultEventsMap
-> extends StrictEventEmitter<
-  ServerSideEvents,
-  EmitEvents,
-  ServerReservedEventsMap<ListenEvents, EmitEvents, ServerSideEvents>
-> {
-  public readonly sockets: Namespace<
-    ListenEvents,
-    EmitEvents,
-    ServerSideEvents
-  >;
-  /**
-   * A reference to the underlying Engine.IO server.
-   *
-   * Example:
-   *
-   * <code>
-   *   const clientsCount = io.engine.clientsCount;
-   * </code>
-   *
-   */
-  public engine: any;
+export class Server extends EventEmitter {
+  public readonly sockets: Namespace;

  /** @private */
  readonly _parser: typeof parser;
@@ -201,18 +166,13 @@ export class Server<
  /**
   * @private
   */
-  _nsps: Map<
-    string,
-    Namespace<ListenEvents, EmitEvents, ServerSideEvents>
-  > = new Map();
-  private parentNsps: Map<
-    ParentNspNameMatchFn,
-    ParentNamespace<ListenEvents, EmitEvents, ServerSideEvents>
-  > = new Map();
-  private _adapter?: AdapterConstructor;
+  _nsps: Map<string, Namespace> = new Map();
+  private parentNsps: Map<ParentNspNameMatchFn, ParentNamespace> = new Map();
+  private _adapter?: typeof Adapter;
  private _serveClient: boolean;
  private opts: Partial<EngineOptions>;
  private eio;
+  private engine;
  private _path: string;
  private clientPathRegex: RegExp;

@@ -287,9 +247,7 @@ export class Server<
  _checkNamespace(
    name: string,
    auth: { [key: string]: any },
-    fn: (
-      nsp: Namespace<ListenEvents, EmitEvents, ServerSideEvents> | false
-    ) => void
+    fn: (nsp: Namespace | false) => void
  ): void {
    if (this.parentNsps.size === 0) return fn(false);

@@ -304,12 +262,7 @@ export class Server<
        if (err || !allow) {
          run();
        } else {
-          const namespace = this.parentNsps
-            .get(nextFn.value)!
-            .createChild(name);
-          // @ts-ignore
-          this.sockets.emitReserved("new_namespace", namespace);
-          fn(namespace);
+          fn(this.parentNsps.get(nextFn.value)!.createChild(name));
        }
      });
    };
@@ -362,11 +315,10 @@ export class Server<
   * @return self when setting or value when getting
   * @public
   */
-  public adapter(): AdapterConstructor | undefined;
-  public adapter(v: AdapterConstructor): this;
-  public adapter(
-    v?: AdapterConstructor
-  ): AdapterConstructor | undefined | this {
+  public adapter(): typeof Adapter | undefined;
+  public adapter(v: typeof Adapter): this;
+  public adapter(v?: typeof Adapter): typeof Adapter | undefined | this;
+  public adapter(v?: typeof Adapter): typeof Adapter | undefined | this {
    if (!arguments.length) return this._adapter;
    this._adapter = v;
    for (const nsp of this._nsps.values()) {
@@ -604,8 +556,8 @@ export class Server<
   */
  public of(
    name: string | RegExp | ParentNspNameMatchFn,
-    fn?: (socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>) => void
-  ): Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
+    fn?: (socket: Socket) => void
+  ): Namespace {
    if (typeof name === "function" || name instanceof RegExp) {
      const parentNsp = new ParentNamespace(this);
      debug("initializing parent namespace %s", parentNsp.name);
@@ -631,10 +583,6 @@ export class Server<
      debug("initializing namespace %s", name);
      nsp = new Namespace(this, name);
      this._nsps.set(name, nsp);
-      if (name !== "/") {
-        // @ts-ignore
-        this.sockets.emitReserved("new_namespace", nsp);
-      }
    }
    if (fn) nsp.on("connect", fn);
    return nsp;
@@ -667,10 +615,7 @@ export class Server<
   * @public
   */
  public use(
-    fn: (
-      socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
-      next: (err?: ExtendedError) => void
-    ) => void
+    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
  ): this {
    this.sockets.use(fn);
    return this;
@@ -679,36 +624,24 @@ export class Server<
  /**
   * Targets a room when emitting.
   *
-   * @param room
+   * @param name
   * @return self
   * @public
   */
-  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    return this.sockets.to(room);
+  public to(name: Room): this {
+    this.sockets.to(name);
+    return this;
  }

  /**
   * Targets a room when emitting.
   *
-   * @param room
-   * @return self
-   * @public
-   */
-  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    return this.sockets.in(room);
-  }
-
-  /**
-   * Excludes a room when emitting.
-   *
   * @param name
   * @return self
   * @public
   */
-  public except(
-    name: Room | Room[]
-  ): Server<ListenEvents, EmitEvents, ServerSideEvents> {
-    this.sockets.except(name);
+  public in(name: Room): this {
+    this.sockets.in(name);
    return this;
  }

@@ -718,7 +651,7 @@ export class Server<
   * @return self
   * @public
   */
-  public send(...args: EventParams<EmitEvents, "message">): this {
+  public send(...args: readonly any[]): this {
    this.sockets.emit("message", ...args);
    return this;
  }
@@ -729,25 +662,11 @@ export class Server<
   * @return self
   * @public
   */
-  public write(...args: EventParams<EmitEvents, "message">): this {
+  public write(...args: readonly any[]): this {
    this.sockets.emit("message", ...args);
    return this;
  }

-  /**
-   * Emit a packet to other Socket.IO servers
-   *
-   * @param ev - the event name
-   * @param args - an array of arguments, which may include an acknowledgement callback at the end
-   * @public
-   */
-  public serverSideEmit<Ev extends EventNames<ServerSideEvents>>(
-    ev: Ev,
-    ...args: EventParams<ServerSideEvents, Ev>
-  ): boolean {
-    return this.sockets.serverSideEmit(ev, ...args);
-  }
-
  /**
   * Gets a list of socket ids.
   *
@@ -764,8 +683,9 @@ export class Server<
   * @return self
   * @public
   */
-  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
-    return this.sockets.compress(compress);
+  public compress(compress: boolean): this {
+    this.sockets.compress(compress);
+    return this;
  }

  /**
@@ -776,8 +696,9 @@ export class Server<
   * @return self
   * @public
   */
-  public get volatile(): BroadcastOperator<EmitEvents> {
-    return this.sockets.volatile;
+  public get volatile(): this {
+    this.sockets.volatile;
+    return this;
  }

  /**
@@ -786,47 +707,9 @@ export class Server<
   * @return self
   * @public
   */
-  public get local(): BroadcastOperator<EmitEvents> {
-    return this.sockets.local;
-  }
-
-  /**
-   * Returns the matching socket instances
-   *
-   * @public
-   */
-  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
-    return this.sockets.fetchSockets();
-  }
-
-  /**
-   * Makes the matching socket instances join the specified rooms
-   *
-   * @param room
-   * @public
-   */
-  public socketsJoin(room: Room | Room[]): void {
-    return this.sockets.socketsJoin(room);
-  }
-
-  /**
-   * Makes the matching socket instances leave the specified rooms
-   *
-   * @param room
-   * @public
-   */
-  public socketsLeave(room: Room | Room[]): void {
-    return this.sockets.socketsLeave(room);
-  }
-
-  /**
-   * Makes the matching socket instances disconnect
-   *
-   * @param close - whether to close the underlying connection
-   * @public
-   */
-  public disconnectSockets(close: boolean = false): void {
-    return this.sockets.disconnectSockets(close);
+  public get local(): this {
+    this.sockets.local;
+    return this;
  }
 }

@@ -848,7 +731,5 @@ emitterMethods.forEach(function (fn) {

 module.exports = (srv?, opts?) => new Server(srv, opts);
 module.exports.Server = Server;
-module.exports.Namespace = Namespace;
-module.exports.Socket = Socket;

-export { Socket, ServerOptions, Namespace, BroadcastOperator, RemoteSocket };
+export { Socket, ServerOptions, Namespace };
--- a/lib/namespace.ts
+++ b/lib/namespace.ts
@@ -1,16 +1,10 @@
-import { Socket } from "./socket";
+import { Socket, RESERVED_EVENTS } from "./socket";
 import type { Server } from "./index";
-import {
-  EventParams,
-  EventNames,
-  EventsMap,
-  StrictEventEmitter,
-  DefaultEventsMap,
-} from "./typed-events";
 import type { Client } from "./client";
+import { EventEmitter } from "events";
+import { PacketType } from "socket.io-parser";
 import debugModule from "debug";
 import type { Adapter, Room, SocketId } from "socket.io-adapter";
-import { BroadcastOperator, RemoteSocket } from "./broadcast-operator";

 const debug = debugModule("socket.io:namespace");

@@ -18,63 +12,26 @@ export interface ExtendedError extends Error {
  data?: any;
 }

-export interface NamespaceReservedEventsMap<
-  ListenEvents extends EventsMap,
-  EmitEvents extends EventsMap,
-  ServerSideEvents extends EventsMap
-> {
-  connect: (socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>) => void;
-  connection: (
-    socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>
-  ) => void;
-}
-
-export interface ServerReservedEventsMap<
-  ListenEvents,
-  EmitEvents,
-  ServerSideEvents
-> extends NamespaceReservedEventsMap<
-    ListenEvents,
-    EmitEvents,
-    ServerSideEvents
-  > {
-  new_namespace: (
-    namespace: Namespace<ListenEvents, EmitEvents, ServerSideEvents>
-  ) => void;
-}
-
-export const RESERVED_EVENTS: ReadonlySet<string | Symbol> = new Set<
-  keyof ServerReservedEventsMap<never, never, never>
->(<const>["connect", "connection", "new_namespace"]);
-
-export class Namespace<
-  ListenEvents extends EventsMap = DefaultEventsMap,
-  EmitEvents extends EventsMap = ListenEvents,
-  ServerSideEvents extends EventsMap = DefaultEventsMap
-> extends StrictEventEmitter<
-  ServerSideEvents,
-  EmitEvents,
-  NamespaceReservedEventsMap<ListenEvents, EmitEvents, ServerSideEvents>
-> {
+export class Namespace extends EventEmitter {
  public readonly name: string;
-  public readonly sockets: Map<
-    SocketId,
-    Socket<ListenEvents, EmitEvents, ServerSideEvents>
-  > = new Map();
+  public readonly sockets: Map<SocketId, Socket> = new Map();

  public adapter: Adapter;

  /** @private */
-  readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>;
+  readonly server: Server;

  /** @private */
  _fns: Array<
-    (
-      socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
-      next: (err?: ExtendedError) => void
-    ) => void
+    (socket: Socket, next: (err?: ExtendedError) => void) => void
  > = [];

+  /** @private */
+  _rooms: Set<Room> = new Set();
+
+  /** @private */
+  _flags: any = {};
+
  /** @private */
  _ids: number = 0;

@@ -84,10 +41,7 @@ export class Namespace<
   * @param server instance
   * @param name
   */
-  constructor(
-    server: Server<ListenEvents, EmitEvents, ServerSideEvents>,
-    name: string
-  ) {
+  constructor(server: Server, name: string) {
    super();
    this.server = server;
    this.name = name;
@@ -102,7 +56,6 @@ export class Namespace<
   * @private
   */
  _initAdapter(): void {
-    // @ts-ignore
    this.adapter = new (this.server.adapter()!)(this);
  }

@@ -113,10 +66,7 @@ export class Namespace<
   * @public
   */
  public use(
-    fn: (
-      socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
-      next: (err?: ExtendedError) => void
-    ) => void
+    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
  ): this {
    this._fns.push(fn);
    return this;
@@ -129,10 +79,7 @@ export class Namespace<
   * @param fn - last fn call in the middleware
   * @private
   */
-  private run(
-    socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
-    fn: (err: ExtendedError | null) => void
-  ) {
+  private run(socket: Socket, fn: (err: ExtendedError | null) => void) {
    const fns = this._fns.slice(0);
    if (!fns.length) return fn(null);

@@ -155,34 +102,25 @@ export class Namespace<
  /**
   * Targets a room when emitting.
   *
-   * @param room
+   * @param name
   * @return self
   * @public
   */
-  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    return new BroadcastOperator(this.adapter).to(room);
+  public to(name: Room): this {
+    this._rooms.add(name);
+    return this;
  }

  /**
   * Targets a room when emitting.
   *
-   * @param room
+   * @param name
   * @return self
   * @public
   */
-  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    return new BroadcastOperator(this.adapter).in(room);
-  }
-
-  /**
-   * Excludes a room when emitting.
-   *
-   * @param room
-   * @return self
-   * @public
-   */
-  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
-    return new BroadcastOperator(this.adapter).except(room);
+  public in(name: Room): this {
+    this._rooms.add(name);
+    return this;
  }

  /**
@@ -191,11 +129,7 @@ export class Namespace<
   * @return {Socket}
   * @private
   */
-  _add(
-    client: Client<ListenEvents, EmitEvents, ServerSideEvents>,
-    query,
-    fn?: () => void
-  ): Socket<ListenEvents, EmitEvents, ServerSideEvents> {
+  _add(client: Client, query, fn?: () => void): Socket {
    debug("adding socket to nsp %s", this.name);
    const socket = new Socket(this, client, query);
    this.run(socket, (err) => {
@@ -223,8 +157,8 @@ export class Namespace<
          if (fn) fn();

          // fire user-set events
-          this.emitReserved("connect", socket);
-          this.emitReserved("connection", socket);
+          super.emit("connect", socket);
+          super.emit("connection", socket);
        } else {
          debug("next called after client was closed - ignoring socket");
        }
@@ -238,7 +172,7 @@ export class Namespace<
   *
   * @private
   */
-  _remove(socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>): void {
+  _remove(socket: Socket): void {
    if (this.sockets.has(socket.id)) {
      this.sockets.delete(socket.id);
    } else {
@@ -252,63 +186,56 @@ export class Namespace<
   * @return Always true
   * @public
   */
-  public emit<Ev extends EventNames<EmitEvents>>(
-    ev: Ev,
-    ...args: EventParams<EmitEvents, Ev>
-  ): boolean {
-    return new BroadcastOperator<EmitEvents>(this.adapter).emit(ev, ...args);
-  }
-
-  /**
-   * Sends a `message` event to all clients.
-   *
-   * @return self
-   * @public
-   */
-  public send(...args: EventParams<EmitEvents, "message">): this {
-    this.emit("message", ...args);
-    return this;
-  }
-
-  /**
-   * Sends a `message` event to all clients.
-   *
-   * @return self
-   * @public
-   */
-  public write(...args: EventParams<EmitEvents, "message">): this {
-    this.emit("message", ...args);
-    return this;
-  }
-
-  /**
-   * Emit a packet to other Socket.IO servers
-   *
-   * @param ev - the event name
-   * @param args - an array of arguments, which may include an acknowledgement callback at the end
-   * @public
-   */
-  public serverSideEmit<Ev extends EventNames<ServerSideEvents>>(
-    ev: Ev,
-    ...args: EventParams<ServerSideEvents, Ev>
-  ): boolean {
+  public emit(ev: string | Symbol, ...args: any[]): true {
    if (RESERVED_EVENTS.has(ev)) {
      throw new Error(`"${ev}" is a reserved event name`);
    }
+    // set up packet object
    args.unshift(ev);
-    this.adapter.serverSideEmit(args);
+    const packet = {
+      type: PacketType.EVENT,
+      data: args,
+    };
+
+    if ("function" == typeof args[args.length - 1]) {
+      throw new Error("Callbacks are not supported when broadcasting");
+    }
+
+    const rooms = new Set(this._rooms);
+    const flags = Object.assign({}, this._flags);
+
+    // reset flags
+    this._rooms.clear();
+    this._flags = {};
+
+    this.adapter.broadcast(packet, {
+      rooms: rooms,
+      flags: flags,
+    });
+
    return true;
  }

  /**
-   * Called when a packet is received from another Socket.IO server
+   * Sends a `message` event to all clients.
   *
-   * @param args - an array of arguments, which may include an acknowledgement callback at the end
-   *
-   * @private
+   * @return self
+   * @public
   */
-  _onServerSideEmit(args: [string, ...any[]]) {
-    super.emitUntyped.apply(this, args);
+  public send(...args: readonly any[]): this {
+    this.emit("message", ...args);
+    return this;
+  }
+
+  /**
+   * Sends a `message` event to all clients.
+   *
+   * @return self
+   * @public
+   */
+  public write(...args: readonly any[]): this {
+    this.emit("message", ...args);
+    return this;
  }

  /**
@@ -318,7 +245,14 @@ export class Namespace<
   * @public
   */
  public allSockets(): Promise<Set<SocketId>> {
-    return new BroadcastOperator(this.adapter).allSockets();
+    if (!this.adapter) {
+      throw new Error(
+        "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
+      );
+    }
+    const rooms = new Set(this._rooms);
+    this._rooms.clear();
+    return this.adapter.sockets(rooms);
  }

  /**
@@ -328,8 +262,9 @@ export class Namespace<
   * @return self
   * @public
   */
-  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
-    return new BroadcastOperator(this.adapter).compress(compress);
+  public compress(compress: boolean): this {
+    this._flags.compress = compress;
+    return this;
  }

  /**
@@ -340,8 +275,9 @@ export class Namespace<
   * @return self
   * @public
   */
-  public get volatile(): BroadcastOperator<EmitEvents> {
-    return new BroadcastOperator(this.adapter).volatile;
+  public get volatile(): this {
+    this._flags.volatile = true;
+    return this;
  }

  /**
@@ -350,46 +286,8 @@ export class Namespace<
   * @return self
   * @public
   */
-  public get local(): BroadcastOperator<EmitEvents> {
-    return new BroadcastOperator(this.adapter).local;
-  }
-
-  /**
-   * Returns the matching socket instances
-   *
-   * @public
-   */
-  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
-    return new BroadcastOperator(this.adapter).fetchSockets();
-  }
-
-  /**
-   * Makes the matching socket instances join the specified rooms
-   *
-   * @param room
-   * @public
-   */
-  public socketsJoin(room: Room | Room[]): void {
-    return new BroadcastOperator(this.adapter).socketsJoin(room);
-  }
-
-  /**
-   * Makes the matching socket instances leave the specified rooms
-   *
-   * @param room
-   * @public
-   */
-  public socketsLeave(room: Room | Room[]): void {
-    return new BroadcastOperator(this.adapter).socketsLeave(room);
-  }
-
-  /**
-   * Makes the matching socket instances disconnect
-   *
-   * @param close - whether to close the underlying connection
-   * @public
-   */
-  public disconnectSockets(close: boolean = false): void {
-    return new BroadcastOperator(this.adapter).disconnectSockets(close);
+  public get local(): this {
+    this._flags.local = true;
+    return this;
  }
 }
--- a/lib/parent-namespace.ts
+++ b/lib/parent-namespace.ts
@@ -1,24 +1,11 @@
 import { Namespace } from "./namespace";
 import type { Server } from "./index";
-import type {
-  EventParams,
-  EventNames,
-  EventsMap,
-  DefaultEventsMap,
-} from "./typed-events";
-import type { BroadcastOptions } from "socket.io-adapter";

-export class ParentNamespace<
-  ListenEvents extends EventsMap = DefaultEventsMap,
-  EmitEvents extends EventsMap = ListenEvents,
-  ServerSideEvents extends EventsMap = DefaultEventsMap
-> extends Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
+export class ParentNamespace extends Namespace {
  private static count: number = 0;
-  private children: Set<
-    Namespace<ListenEvents, EmitEvents, ServerSideEvents>
-  > = new Set();
+  private children: Set<Namespace> = new Set();

-  constructor(server: Server<ListenEvents, EmitEvents, ServerSideEvents>) {
+  constructor(server: Server) {
    super(server, "/_" + ParentNamespace.count++);
  }

@@ -26,36 +13,29 @@ 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 };
+    /* no-op */
  }

-  public emit<Ev extends EventNames<EmitEvents>>(
-    ev: Ev,
-    ...args: EventParams<EmitEvents, Ev>
-  ): boolean {
+  public emit(ev: string | Symbol, ...args: [...any]): true {
    this.children.forEach((nsp) => {
+      nsp._rooms = this._rooms;
+      nsp._flags = this._flags;
      nsp.emit(ev, ...args);
    });
+    this._rooms.clear();
+    this._flags = {};

    return true;
  }

-  createChild(
-    name: string
-  ): Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
+  createChild(name: string): Namespace {
    const namespace = new Namespace(this.server, name);
    namespace._fns = this._fns.slice(0);
    this.listeners("connect").forEach((listener) =>
-      namespace.on("connect", listener)
+      namespace.on("connect", listener as (...args: any[]) => void)
    );
    this.listeners("connection").forEach((listener) =>
-      namespace.on("connection", listener)
+      namespace.on("connection", listener as (...args: any[]) => void)
    );
    this.children.add(namespace);
    this.server._nsps.set(name, namespace);
--- a/Show More
+++ b/Show More