chore(release): 4.0.2

Diff: https://github.com/socketio/socket.io/compare/4.0.1...4.0.2
fix(typings): make "engine" attribute public
2026-01-11 16:08:24 -05:00 · 2021-05-06 14:38:26 +02:00 · 2021-05-06 14:36:25 +02:00 · 2021-05-06 14:36:12 +02:00 · 2021-04-23 00:08:18 +02:00 · 2021-04-01 01:25:56 +02:00
98 changed files with 4276 additions and 29356 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,21 @@
+## [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)


--- a/client-dist/socket.io.js
+++ b/client-dist/socket.io.js
@@ -1,5 +1,5 @@
 /*!
- * Socket.IO v4.0.0
+ * Socket.IO v4.0.2
 * (c) 2014-2021 Guillermo Rauch
 * Released under the MIT License.
 */
@@ -116,21 +116,12 @@ function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "functi
 Object.defineProperty(exports, "__esModule", {
  value: true
 });
-exports.Socket = exports.io = exports.Manager = exports.protocol = void 0;
+exports.io = exports.Socket = exports.Manager = exports.protocol = void 0;

 var url_1 = __webpack_require__(/*! ./url */ "./build/url.js");

 var manager_1 = __webpack_require__(/*! ./manager */ "./build/manager.js");

-var socket_1 = __webpack_require__(/*! ./socket */ "./build/socket.js");
-
-Object.defineProperty(exports, "Socket", {
-  enumerable: true,
-  get: function get() {
-    return socket_1.Socket;
-  }
-});
-
 var debug = __webpack_require__(/*! debug */ "./node_modules/debug/src/browser.js")("socket.io-client");
 /**
 * Module exports.
@@ -151,7 +142,7 @@ function lookup(uri, opts) {
  }

  opts = opts || {};
-  var parsed = url_1.url(uri, opts.path);
+  var parsed = url_1.url(uri, opts.path || "/socket.io");
  var source = parsed.source;
  var id = parsed.id;
  var path = parsed.path;
@@ -216,6 +207,16 @@ Object.defineProperty(exports, "Manager", {
  }
 });

+var socket_1 = __webpack_require__(/*! ./socket */ "./build/socket.js");
+
+Object.defineProperty(exports, "Socket", {
+  enumerable: true,
+  get: function get() {
+    return socket_1.Socket;
+  }
+});
+exports["default"] = lookup;
+
 /***/ }),

 /***/ "./build/manager.js":
@@ -1215,8 +1216,8 @@ var Socket = /*#__PURE__*/function (_typed_events_1$Stric) {
      this.id = id;
      this.connected = true;
      this.disconnected = false;
-      this.emitReserved("connect");
      this.emitBuffered();
+      this.emitReserved("connect");
    }
    /**
     * Emit buffered events (received and emitted).
@@ -3216,6 +3217,8 @@ var parser = __webpack_require__(/*! engine.io-parser */ "./node_modules/engine.

 var Emitter = __webpack_require__(/*! component-emitter */ "./node_modules/component-emitter/index.js");

+var debug = __webpack_require__(/*! debug */ "./node_modules/debug/src/browser.js")("engine.io-client:transport");
+
 var Transport = /*#__PURE__*/function (_Emitter) {
  _inherits(Transport, _Emitter);

@@ -3302,7 +3305,8 @@ var Transport = /*#__PURE__*/function (_Emitter) {
      if ("open" === this.readyState) {
        this.write(packets);
      } else {
-        throw new Error("Transport not open");
+        // this might happen if the transport was silently closed in the beforeunload event handler
+        debug("transport is not open, discarding packets");
      }
    }
    /**
--- 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
@@ -0,0 +1 @@
+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": "^3.0.4",
-    "socket.io-client": "^3.0.4",
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0",
    "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, Socket } from "socket.io";
+import { Server } from "socket.io";

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

 let todos: Array<Todo> = [];

-io.on("connect", (socket: Socket) => {
+io.on("connect", (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
@@ -0,0 +1,19 @@
+# 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
@@ -0,0 +1,17 @@
+# 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
@@ -0,0 +1,16 @@
+# 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
@@ -0,0 +1,46 @@
+# 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
@@ -0,0 +1,31 @@
+# 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
@@ -0,0 +1,128 @@
+{
+  "$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
@@ -0,0 +1,37 @@
+// @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
@@ -0,0 +1,23 @@
+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
@@ -0,0 +1,11 @@
+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
@@ -0,0 +1,13 @@
+/* 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
@@ -0,0 +1,44 @@
+// 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
@@ -0,0 +1,46 @@
+{
+  "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
@@ -0,0 +1,23 @@
+<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
@@ -0,0 +1,31 @@
+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
@@ -0,0 +1,59 @@
+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
@@ -0,0 +1,19 @@
+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
@@ -0,0 +1,140 @@
+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
@@ -0,0 +1,4 @@
+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
@@ -0,0 +1,17 @@
+// 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
@@ -0,0 +1,13 @@
+<!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
@@ -0,0 +1,12 @@
+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
@@ -0,0 +1,63 @@
+/**
+ * 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
@@ -0,0 +1,381 @@
+/* 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
@@ -0,0 +1,25 @@
+// 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
@@ -0,0 +1,15 @@
+/* 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
@@ -0,0 +1,29 @@
+/* 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
@@ -0,0 +1,18 @@
+/* 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
@@ -0,0 +1,152 @@
+{
+  "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
@@ -0,0 +1,35 @@
+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
@@ -0,0 +1,37 @@
+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
@@ -0,0 +1,19 @@
+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
@@ -0,0 +1,159 @@
+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
@@ -0,0 +1,49 @@
+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
@@ -0,0 +1,24 @@
+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
@@ -0,0 +1,36 @@
+{
+  "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
@@ -0,0 +1,309 @@
+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
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "outDir": "./dist",
+    "module": "commonjs",
+    "target": "es2017",
+    "strict": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}
--- a/examples/chat/package-lock.json
+++ b/examples/chat/package-lock.json
@@ -1,499 +0,0 @@
-{
-  "name": "socket.io-chat",
-  "version": "0.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
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-      "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=="
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-    "content-disposition": {
-      "version": "0.5.3",
-      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
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-      "requires": {
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-      }
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-      "version": "1.0.4",
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-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
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-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
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-      "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": "^3.0.0"
+    "socket.io": "^4.0.0"
  },
  "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": "^3.1.0",
+    "socket.io": "^4.0.0",
    "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": "^3.1.0",
+    "socket.io": "^4.0.0",
    "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": "^3.1.0"
+    "socket.io-client": "^4.0.0"
  },
  "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": "^3.1.0",
+    "socket.io": "^4.0.0",
    "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": "^3.1.0",
+    "socket.io": "^4.0.0",
    "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": "^2.3.0",
-    "socket.io-client": "^2.3.0"
+    "socket.io": "4",
+    "socket.io-client": "4"
  },
  "scripts": {
    "start": "react-scripts start",
--- a/examples/create-react-app-example/server.js
+++ b/examples/create-react-app-example/server.js
@@ -1,4 +1,8 @@
-const io = require('socket.io')();
+const io = require('socket.io')({
+  cors: {
+    origin: ['http://localhost:3000']
+  }
+});

 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": "socketio/socket.io",
-    "socket.io-client": "socketio/socket.io-client",
-    "socket.io-json-parser": "^1.0.0",
-    "socket.io-msgpack-parser": "^1.0.0",
+    "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",
    "webpack": "^2.4.1"
  }
 }
--- a/examples/custom-parsers/public/.gitignore
+++ b/examples/custom-parsers/public/.gitignore
@@ -0,0 +1 @@
+*.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, callback) {
+  encode (packet) {
    switch (packet.type) {
      case TYPES.EVENT:
-        return callback([ this.pack(packet) ]);
+        return [ this.pack(packet) ];
      default:
-        return callback([ JSON.stringify(packet) ]);
+        return [ JSON.stringify(packet) ];
    }
  }
  pack (packet) {
--- a/examples/custom-parsers/src/server.js
+++ b/examples/custom-parsers/src/server.js
@@ -14,15 +14,22 @@ const msgpackParser = require('socket.io-msgpack-parser');
 const jsonParser = require('socket.io-json-parser');
 const customParser = require('./custom-parser');

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

 let string = [];
--- a/examples/es-modules/package-lock.json
+++ b/examples/es-modules/package-lock.json
@@ -1,217 +0,0 @@
-{
-  "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",
-        "ws": "^7.1.2"
-      }
-    },
-    "engine.io-client": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-4.0.1.tgz",
-      "integrity": "sha512-3XXfWrEutlf1vg5PlS805bD+AgZXhRIKYAG04f1iCGOs70dWEYlZGfCZUNwPwNx05lBCKs1lIeL3SkLB0P++xw==",
-      "requires": {
-        "base64-arraybuffer": "0.1.4",
-        "component-emitter": "~1.3.0",
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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"
-      }
-    },
-    "socket.io-parser": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
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-      "requires": {
-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0"
-      }
-    },
-    "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=="
-    },
-    "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": "^3.0.0",
-    "socket.io-client": "^3.0.0"
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0"
  }
 }
--- 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("/").connected[socketId]) {
+  if (socketId && io.of("/").sockets.get(socketId)) {
    console.log(`forcefully closing socket ${socketId}`);
-    io.sockets.connected[socketId].disconnect(true);
+    io.of("/").sockets.get(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
@@ -1,783 +0,0 @@
-{
-  "name": "passport-example",
-  "version": "0.0.1",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
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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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-      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
-    },
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-      "resolved": "https://registry.npmjs.org/better-assert/-/better-assert-1.0.2.tgz",
-      "integrity": "sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=",
-      "requires": {
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-      }
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-      "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz",
-      "integrity": "sha512-gaqbzQPqOoamawKg0LGVd7SzLgXS+JH61oWprSLH+P+abTczqJbhTR8CmJ2u9/bUYNmHTGJx/UEmn6doAvvuig=="
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-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
-      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
-      "requires": {
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-        "iconv-lite": "0.4.24",
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-        "qs": "6.7.0",
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-      "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": "~2.3.0"
+    "socket.io": "^4.0.0"
  },
  "scripts": {
    "start": "node index.js"
--- a/examples/private-messaging/package.json
+++ b/examples/private-messaging/package.json
@@ -9,7 +9,7 @@
  },
  "dependencies": {
    "core-js": "^3.6.5",
-    "socket.io-client": "^3.1.1",
+    "socket.io-client": "^4.0.0",
    "vue": "^2.6.11"
  },
  "devDependencies": {
--- a/examples/private-messaging/server/package.json
+++ b/examples/private-messaging/server/package.json
@@ -11,7 +11,7 @@
  "dependencies": {
    "@socket.io/sticky": "^1.0.0",
    "ioredis": "^4.22.0",
-    "socket.io": "^3.1.1",
+    "socket.io": "^4.0.0",
    "socket.io-redis": "^6.0.1"
  }
 }
--- 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": "^3.0.1",
-    "socket.io-client": "^3.0.1"
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0"
  },
  "devDependencies": {
    "babel-preset-expo": "~8.1.0",
--- a/examples/tweet-stream/index.js
+++ b/examples/tweet-stream/index.js
@@ -7,7 +7,11 @@ const twitter = new Twitter({
  token_secret: process.env.TWITTER_TOKEN_SECRET
 });

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

 twitter.track('socket.io');
 twitter.track('javascript');
--- a/examples/tweet-stream/package-lock.json
+++ b/examples/tweet-stream/package-lock.json
@@ -1,705 +0,0 @@
-{
-  "name": "socket.io-tweet-stream",
-  "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"
-      }
-    },
-    "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"
-      }
-    },
-    "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=="
-    },
-    "asn1": {
-      "version": "0.2.4",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
-      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
-      "requires": {
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-      }
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-    "assert-plus": {
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-      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
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-    },
-    "asynckit": {
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-      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
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-      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
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-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.9.1.tgz",
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-    "better-assert": {
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-      "integrity": "sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=",
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-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
-    },
-    "uri-js": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
-      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
-      "requires": {
-        "punycode": "^2.1.0"
-      }
-    },
-    "uuid": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
-      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
-    },
-    "verror": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "requires": {
-        "assert-plus": "^1.0.0",
-        "core-util-is": "1.0.2",
-        "extsprintf": "^1.2.0"
-      }
-    },
-    "ws": {
-      "version": "7.2.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.3.tgz",
-      "integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ=="
-    },
-    "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/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": "~2.3.0"
+    "socket.io": "^4.0.0"
  }
 }
--- a/examples/typescript/package-lock.json
+++ b/examples/typescript/package-lock.json
@@ -1,295 +0,0 @@
-{
-  "name": "typescript-example",
-  "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=="
-    },
-    "@types/cookie": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.0.tgz",
-      "integrity": "sha512-y7mImlc/rNkvCRmg8gC3/lj87S7pTUIJ6QGjwHR9WQJcFs+ZMTOaoPrkdFA/YdbuqVEmEbb5RdhVxMkAcgOnpg=="
-    },
-    "@types/cors": {
-      "version": "2.8.9",
-      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.9.tgz",
-      "integrity": "sha512-zurD1ibz21BRlAOIKP8yhrxlqKx6L9VCwkB5kMiP6nZAhoF5MvC7qS1qPA7nRcr1GJolfkQC7/EAL4hdYejLtg=="
-    },
-    "@types/node": {
-      "version": "14.14.16",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.16.tgz",
-      "integrity": "sha512-naXYePhweTi+BMv11TgioE2/FXU4fSl29HAH1ffxVciNsH3rYXjNP2yM8wqmSm7jS20gM8TIklKiTen+1iVncw=="
-    },
-    "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"
-      }
-    },
-    "arg": {
-      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.3.tgz",
-      "integrity": "sha512-58S9QDqG0Xx27YwPSt9fJxivjYl432YCwfDMfZ+71RAqUrZef7LrKQZ3LHLOwCS4FLNBplP533Zx895SeOCHvA=="
-    },
-    "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=="
-    },
-    "buffer-from": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
-      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A=="
-    },
-    "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"
-      }
-    },
-    "diff": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.2.tgz",
-      "integrity": "sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A=="
-    },
-    "engine.io": {
-      "version": "4.0.5",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-4.0.5.tgz",
-      "integrity": "sha512-Ri+whTNr2PKklxQkfbGjwEo+kCBUM4Qxk4wtLqLrhH+b1up2NFL9g9pjYWiCV/oazwB0rArnvF/ZmZN2ab5Hpg==",
-      "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"
-      }
-    },
-    "engine.io-client": {
-      "version": "4.0.5",
-      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-4.0.5.tgz",
-      "integrity": "sha512-1lkn0QdekHQPMTcxUh8LqIuxQHNtKV5GvqkQzmZ1rYKAvB6puMm13U7K1ps3OQZ4joE46asQiAKrcdL9weNEVw==",
-      "requires": {
-        "base64-arraybuffer": "0.1.4",
-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0",
-        "engine.io-parser": "~4.0.1",
-        "has-cors": "1.1.0",
-        "parseqs": "0.0.6",
-        "parseuri": "0.0.6",
-        "ws": "~7.2.1",
-        "xmlhttprequest-ssl": "~1.5.4",
-        "yeast": "0.1.2"
-      },
-      "dependencies": {
-        "ws": {
-          "version": "7.2.5",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.5.tgz",
-          "integrity": "sha512-C34cIU4+DB2vMyAbmEKossWq2ZQDr6QEyuuCzWrM9zfw1sGc0mYiJ0UnG9zzNykt49C2Fi34hvr2vssFQRS6EA=="
-        }
-      }
-    },
-    "engine.io-parser": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.2.tgz",
-      "integrity": "sha512-sHfEQv6nmtJrq6TKuIz5kyEKH/qSdK56H/A+7DnAuUPWosnIZAS2NHNcPLmyjtY3cGS/MqJdZbUjW97JU72iYg==",
-      "requires": {
-        "base64-arraybuffer": "0.1.4"
-      }
-    },
-    "has-cors": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/has-cors/-/has-cors-1.1.0.tgz",
-      "integrity": "sha1-XkdHk/fqmEPRu5nCPu9J/xJv/zk="
-    },
-    "make-error": {
-      "version": "1.3.6",
-      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
-      "integrity": "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw=="
-    },
-    "mime-db": {
-      "version": "1.44.0",
-      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.44.0.tgz",
-      "integrity": "sha512-/NOTfLrsPBVeH7YtFPgsVWveuL+4SjjYxaQ1xtM1KMFj7HdxlBlxeyNLzhyJVx7r4rZGJAZ/6lkKCitSc/Nmpg=="
-    },
-    "mime-types": {
-      "version": "2.1.27",
-      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.27.tgz",
-      "integrity": "sha512-JIhqnCasI9yD+SsmkquHBxTSEuZdQX5BuQnS2Vc7puQQQ+8yiP5AY5uWhpdv4YL4VM5c6iliiYWPgJ/nJQLp7w==",
-      "requires": {
-        "mime-db": "1.44.0"
-      }
-    },
-    "ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="
-    },
-    "negotiator": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
-      "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw=="
-    },
-    "object-assign": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
-      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
-    },
-    "parseqs": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.6.tgz",
-      "integrity": "sha512-jeAGzMDbfSHHA091hr0r31eYfTig+29g3GKKE/PPbEQ65X0lmMwlEoqmhzu0iztID5uJpZsFlUPDP8ThPL7M8w=="
-    },
-    "parseuri": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.6.tgz",
-      "integrity": "sha512-AUjen8sAkGgao7UyCX6Ahv0gIK2fABKmYjvP4xmy5JaKvcbTRueIqIPHLAfq30xJddqSE033IOMUSOMCcK3Sow=="
-    },
-    "socket.io": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-3.0.4.tgz",
-      "integrity": "sha512-Vj1jUoO75WGc9txWd311ZJJqS9Dr8QtNJJ7gk2r7dcM/yGe9sit7qOijQl3GAwhpBOz/W8CwkD7R6yob07nLbA==",
-      "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",
-      "integrity": "sha512-2wo4EXgxOGSFueqvHAdnmi5JLZzWqMArjuP4nqC26AtLh5PoCPsaRbRdah2xhcwTAMooZfjYiNVNkkmmSMaxOQ=="
-    },
-    "socket.io-client": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.4.tgz",
-      "integrity": "sha512-qMvBuS+W9JIN2mkfAWDCxuIt+jpIKDf8C0604zEqx1JrPaPSS6cN0F3B2GYWC83TqBeVJXW66GFxWV3KD88n0Q==",
-      "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"
-      }
-    },
-    "socket.io-parser": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.2.tgz",
-      "integrity": "sha512-Bs3IYHDivwf+bAAuW/8xwJgIiBNtlvnjYRc4PbXgniLmcP1BrakBoq/QhO24rgtgW7VZ7uAaswRGxutUnlAK7g==",
-      "requires": {
-        "@types/component-emitter": "^1.2.10",
-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0"
-      }
-    },
-    "source-map": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
-    },
-    "source-map-support": {
-      "version": "0.5.19",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
-      "integrity": "sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==",
-      "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": "^3.0.4",
-    "socket.io-client": "^3.0.4",
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0",
    "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, Socket } from "socket.io";
+import { Server } from "socket.io";

 const io = new Server(8080);

-io.on("connect", (socket: Socket) => {
+io.on("connect", (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
@@ -1,8 +1,7 @@

 const server = require('http').createServer();
 const io = require('socket.io')(server, {
-  serveClient: false,
-  wsEngine: 'ws' // uws is not supported since it is a native module
+  serveClient: false
 });
 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": "~2.3.0",
+    "socket.io": "^4.0.0",
    "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
@@ -5,5 +5,6 @@ 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
@@ -1,499 +0,0 @@
-{
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-  "version": "1.0.0",
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-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "0.17.1"
-      }
-    },
-    "setprototypeof": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
-      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
-    },
-    "socket.io": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-3.0.0.tgz",
-      "integrity": "sha512-arLQtd+UoJ08NXBRBGUJDyQ9B+cc9WwD67hc5s1WQcs2DyAkYzI5HWg4U0CrFtK00kjyAWxBGhLwVbfOeMqz1A==",
-      "requires": {
-        "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"
-      },
-      "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-adapter": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.0.3.tgz",
-      "integrity": "sha512-2wo4EXgxOGSFueqvHAdnmi5JLZzWqMArjuP4nqC26AtLh5PoCPsaRbRdah2xhcwTAMooZfjYiNVNkkmmSMaxOQ=="
-    },
-    "socket.io-parser": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
-      "integrity": "sha512-5JfNykYptCwU2lkOI0ieoePWm+6stEhkZ2UnLDjqnE1YEjUlXXLd1lpxPZ+g+h3rtaytwWkWrLQCaJULlGqjOg==",
-      "requires": {
-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0"
-      },
-      "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="
-    },
-    "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"
-      }
-    },
-    "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/whiteboard/package.json
+++ b/examples/whiteboard/package.json
@@ -9,7 +9,7 @@
  ],
  "dependencies": {
    "express": "~4.17.1",
-    "socket.io": "^3.0.0"
+    "socket.io": "^4.0.0"
  },
  "scripts": {
    "start": "node index"
--- a/lib/broadcast-operator.ts
+++ b/lib/broadcast-operator.ts
@@ -133,7 +133,7 @@ export class BroadcastOperator<EmitEvents extends EventsMap>
  public emit<Ev extends EventNames<EmitEvents>>(
    ev: Ev,
    ...args: EventParams<EmitEvents, Ev>
-  ): true {
+  ): boolean {
    if (RESERVED_EVENTS.has(ev)) {
      throw new Error(`"${ev}" is a reserved event name`);
    }
@@ -276,7 +276,7 @@ export class RemoteSocket<EmitEvents extends EventsMap>
  public emit<Ev extends EventNames<EmitEvents>>(
    ev: Ev,
    ...args: EventParams<EmitEvents, Ev>
-  ): true {
+  ): boolean {
    return this.operator.emit(ev, ...args);
  }

--- a/lib/client.ts
+++ b/lib/client.ts
@@ -2,7 +2,8 @@ import { Decoder, Encoder, Packet, PacketType } from "socket.io-parser";
 import debugModule = require("debug");
 import url = require("url");
 import type { IncomingMessage } from "http";
-import type { Namespace, Server } from "./index";
+import type { Server } from "./index";
+import type { Namespace } from "./namespace";
 import type { EventsMap } from "./typed-events";
 import type { Socket } from "./socket";
 import type { SocketId } from "socket.io-adapter";
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -177,6 +177,17 @@ export class Server<
  NamespaceReservedEventsMap<ListenEvents, EmitEvents>
 > {
  public readonly sockets: Namespace<ListenEvents, EmitEvents>;
+  /**
+   * A reference to the underlying Engine.IO server.
+   *
+   * Example:
+   *
+   * <code>
+   *   const clientsCount = io.engine.clientsCount;
+   * </code>
+   *
+   */
+  public engine: any;

  /** @private */
  readonly _parser: typeof parser;
@@ -195,7 +206,6 @@ export class Server<
  private _serveClient: boolean;
  private opts: Partial<EngineOptions>;
  private eio;
-  private engine;
  private _path: string;
  private clientPathRegex: RegExp;

@@ -803,5 +813,7 @@ 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 };
--- a/lib/namespace.ts
+++ b/lib/namespace.ts
@@ -229,7 +229,7 @@ export class Namespace<
  public emit<Ev extends EventNames<EmitEvents>>(
    ev: Ev,
    ...args: EventParams<EmitEvents, Ev>
-  ): true {
+  ): boolean {
    return new BroadcastOperator<EmitEvents>(this.adapter).emit(ev, ...args);
  }

--- a/lib/parent-namespace.ts
+++ b/lib/parent-namespace.ts
@@ -35,7 +35,7 @@ export class ParentNamespace<
  public emit<Ev extends EventNames<EmitEvents>>(
    ev: Ev,
    ...args: EventParams<EmitEvents, Ev>
-  ): true {
+  ): boolean {
    this.children.forEach((nsp) => {
      nsp.emit(ev, ...args);
    });
--- a/lib/typed-events.ts
+++ b/lib/typed-events.ts
@@ -43,11 +43,23 @@ export type ReservedOrUserListener<
  ReservedEvents extends EventsMap,
  UserEvents extends EventsMap,
  Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>
-> = Ev extends EventNames<ReservedEvents>
-  ? ReservedEvents[Ev]
-  : Ev extends EventNames<UserEvents>
-  ? UserEvents[Ev]
-  : never;
+> = FallbackToUntypedListener<
+  Ev extends EventNames<ReservedEvents>
+    ? ReservedEvents[Ev]
+    : Ev extends EventNames<UserEvents>
+    ? UserEvents[Ev]
+    : never
+>;
+
+/**
+ * Returns an untyped listener type if `T` is `never`; otherwise, returns `T`.
+ *
+ * This is a hack to mitigate https://github.com/socketio/socket.io/issues/3833.
+ * Needed because of https://github.com/microsoft/TypeScript/issues/41778
+ */
+type FallbackToUntypedListener<T> = [T] extends [never]
+  ? (...args: any[]) => void
+  : T;

 /**
 * Interface for classes that aren't `EventEmitter`s, but still expose a
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
  "name": "socket.io",
-  "version": "4.0.0",
+  "version": "4.0.2",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {
@@ -1220,9 +1220,9 @@
      }
    },
    "engine.io-client": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-5.0.0.tgz",
-      "integrity": "sha512-e6GK0Fqvq45Nu/j7YdIVqXtDPvlsggAcfml3QiEiGdJ1qeh7IQU6knxSN3+yy9BmbnXtIfjo1hK4MFyHKdc9mQ==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-5.0.1.tgz",
+      "integrity": "sha512-CQtGN3YwfvbxVwpPugcsHe5rHT4KgT49CEcQppNtu9N7WxbPN0MAG27lGaem7bvtCFtGNLSL+GEqXsFSz36jTg==",
      "dev": true,
      "requires": {
        "base64-arraybuffer": "0.1.4",
@@ -3335,9 +3335,9 @@
      "integrity": "sha512-rG49L+FwaVEwuAdeBRq49M97YI3ElVabJPzvHT9S6a2CWhDKnjSFasvwAwSYPRhQzfn4NtDIbCaGYgOCOU/rlg=="
    },
    "socket.io-client": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-4.0.0.tgz",
-      "integrity": "sha512-27yQxmXJAEYF19Ygyl8FPJ0if0wegpSmkIIbrWJeI7n7ST1JyH8bbD5v3fjjGY5cfCanACJ3dARUAyiVFNrlTQ==",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-4.0.2.tgz",
+      "integrity": "sha512-z6Hw9Cs+cc7BEkSPlDrtHFpAI++xXMklG9iEEyPJdK4WcFcVrhrXcczYVDZmV3GIpFed5hL3LEXhpnmMy8DqDg==",
      "dev": true,
      "requires": {
        "@types/component-emitter": "^1.2.10",
@@ -3391,9 +3391,9 @@
          }
        },
        "engine.io-client": {
-          "version": "3.5.0",
-          "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-3.5.0.tgz",
-          "integrity": "sha512-12wPRfMrugVw/DNyJk34GQ5vIVArEcVMXWugQGGuw2XxUSztFNmJggZmv8IZlLyEdnpO1QB9LkcjeWewO2vxtA==",
+          "version": "3.5.1",
+          "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-3.5.1.tgz",
+          "integrity": "sha512-oVu9kBkGbcggulyVF0kz6BV3ganqUeqXvD79WOFKa+11oK692w1NyFkuEj4xrkFRpZhn92QOqTk4RQq5LiBXbQ==",
          "dev": true,
          "requires": {
            "component-emitter": "~1.3.0",
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "socket.io",
-  "version": "4.0.0",
+  "version": "4.0.2",
  "description": "node.js realtime framework server",
  "keywords": [
    "realtime",
@@ -65,7 +65,7 @@
    "nyc": "^15.1.0",
    "prettier": "^2.2.0",
    "rimraf": "^3.0.2",
-    "socket.io-client": "4.0.0",
+    "socket.io-client": "4.0.2",
    "socket.io-client-v2": "npm:socket.io-client@^2.4.0",
    "superagent": "^6.1.0",
    "supertest": "^6.0.1",
--- a/test/socket.io.test-d.ts
+++ b/test/socket.io.test-d.ts
@@ -44,6 +44,38 @@ describe("server", () => {
          });
        });
      });
+
+      it("infers 'any' for listener parameters of other events using enums", () => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (socket) => {
+            expectType<Socket<DefaultEventsMap, DefaultEventsMap>>(socket);
+          });
+
+          enum Events {
+            CONNECTION = "connection",
+            TEST = "test",
+          }
+
+          sio.on(Events.CONNECTION, (socket) => {
+            // TODO(#3833): Make this expect `Socket<DefaultEventsMap, DefaultEventsMap>`
+            expectType<any>(socket);
+
+            socket.on("test", (a, b, c) => {
+              expectType<any>(a);
+              expectType<any>(b);
+              expectType<any>(c);
+            });
+
+            socket.on(Events.TEST, (a, b, c) => {
+              expectType<any>(a);
+              expectType<any>(b);
+              expectType<any>(c);
+            });
+          });
+        });
+      });
    });

    describe("emit", () => {
--- a/test/socket.io.ts
+++ b/test/socket.io.ts
@@ -1,6 +1,6 @@
 "use strict";

-import { Server, Socket } from "..";
+import { Server, Socket, Namespace } from "..";
 import { createServer } from "http";
 import fs = require("fs");
 import { join } from "path";
@@ -373,9 +373,6 @@ describe("socket.io", () => {
  });

  describe("namespaces", () => {
-    const { Socket } = require("../dist/socket");
-    const { Namespace } = require("../dist/namespace");
-
    it("should be accessible through .sockets", () => {
      const sio = new Server();
      expect(sio.sockets).to.be.a(Namespace);
@@ -2391,8 +2388,6 @@ describe("socket.io", () => {
  });

  describe("middleware", () => {
-    const { Socket } = require("../dist/socket");
-
    it("should call functions", (done) => {
      const srv = createServer();
      const sio = new Server(srv);
@@ -2581,8 +2576,6 @@ describe("socket.io", () => {
  });

  describe("socket middleware", () => {
-    const { Socket } = require("../dist/socket");
-
    it("should call functions", (done) => {
      const srv = createServer();
      const sio = new Server(srv);
Author	SHA1	Message	Date
Damien Arrachequesne	9fff03487c	chore(release): 4.0.2 Diff: https://github.com/socketio/socket.io/compare/4.0.1...4.0.2	2021-05-06 14:38:26 +02:00
Damien Arrachequesne	b81ce4c9d0	fix(typings): make "engine" attribute public	2021-05-06 14:36:25 +02:00
Damien Arrachequesne	d65b6ee84c	fix: properly export the Socket class Before this change, `require("socket.io").Socket` would return "undefined". Note: having access to the Socket class allows users to modify its prototype. Related: https://github.com/socketio/socket.io/issues/3726	2021-05-06 14:36:12 +02:00
Damien Arrachequesne	3665aada47	docs(examples): basic CRUD application See also: https://socket.io/get-started/basic-crud-application/	2021-04-23 00:08:18 +02:00
Damien Arrachequesne	1faa7e3aea	chore(release): 4.0.1 Diff: https://github.com/socketio/socket.io/compare/4.0.0...4.0.1	2021-04-01 01:25:56 +02:00
Maxime Kjaer	a11152f42b	fix(typings): add fallback to untyped event listener (#3834 ) Related: https://github.com/socketio/socket.io/issues/3833	2021-03-31 11:37:37 +02:00
Maxime Kjaer	259f29720b	docs(examples): remove unnecessary type annotations (#3855 ) Typed events in Socket.IO 4.0 remove the need for writing type annotations in callbacks of reserved events.	2021-03-24 23:12:22 +01:00
Damien Arrachequesne	b4ae8d2e19	docs(examples): update all examples to Socket.IO v4	2021-03-18 15:07:04 +01:00
Adán Toscano	64be1c9985	docs(examples): fix chat example (#3787 )	2021-03-18 14:06:13 +01:00
Solomon English	1a72ae4fe2	fix(typings): update return type from emit (#3843 ) ``` (channel ? io.to(channel) : io).emit("stuff", message); ``` would no longer compile. Related: https://github.com/socketio/socket.io/issues/3844	2021-03-18 11:36:34 +01:00