chore(release): 4.3.1

Diff: https://github.com/socketio/socket.io/compare/4.3.0...4.3.1

.github/workflows/ci.yml

@@ -12,12 +12,12 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x, 15.x]
+        node-version: [12, 14, 16]
 
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci

CHANGELOG.md

@@ -1,3 +1,115 @@
+## [4.3.1](https://github.com/socketio/socket.io/compare/4.3.0...4.3.1) (2021-10-16)
+
+
+### Bug Fixes
+
+* fix server attachment ([#4127](https://github.com/socketio/socket.io/issues/4127)) ([0ef2a4d](https://github.com/socketio/socket.io/commit/0ef2a4d02c9350aff163df9cb61aece89c4dac0f))
+
+
+# [4.3.0](https://github.com/socketio/socket.io/compare/4.2.0...4.3.0) (2021-10-14)
+
+
+### Bug Fixes
+
+* **typings:** add name field to cookie option ([#4099](https://github.com/socketio/socket.io/issues/4099)) ([033c5d3](https://github.com/socketio/socket.io/commit/033c5d399a2b985afad32c1e4b0c16d764e248cd))
+* send volatile packets with binary attachments ([dc81fcf](https://github.com/socketio/socket.io/commit/dc81fcf461cfdbb5b34b1a5a96b84373754047d5))
+
+
+### Features
+
+* serve ESM bundle ([60edecb](https://github.com/socketio/socket.io/commit/60edecb3bd33801803cdcba0aefbafa381a2abb3))
+
+
+# [4.2.0](https://github.com/socketio/socket.io/compare/4.1.3...4.2.0) (2021-08-30)
+
+
+### Bug Fixes
+
+* **typings:** allow async listener in typed events ([ccfd8ca](https://github.com/socketio/socket.io/commit/ccfd8caba6d38b7ba6c5114bd8179346ed07671c))
+
+
+### Features
+
+* ignore the query string when serving client JavaScript ([#4024](https://github.com/socketio/socket.io/issues/4024)) ([24fee27](https://github.com/socketio/socket.io/commit/24fee27ba36485308f8e995879c10931532c814e))
+
+
+## [4.1.3](https://github.com/socketio/socket.io/compare/4.1.2...4.1.3) (2021-07-10)
+
+
+### Bug Fixes
+
+* fix io.except() method ([94e27cd](https://github.com/socketio/socket.io/commit/94e27cd072c8a4eeb9636f6ffbb7a21d382f36b0))
+* remove x-sourcemap header ([a4dffc6](https://github.com/socketio/socket.io/commit/a4dffc6527f412d51a786ae5bf2e9080fe1ca63c))
+
+
+## [4.1.2](https://github.com/socketio/socket.io/compare/4.1.1...4.1.2) (2021-05-17)
+
+
+### Bug Fixes
+
+* **typings:** ensure compatibility with TypeScript 3.x ([0cb6ac9](https://github.com/socketio/socket.io/commit/0cb6ac95b49a27483b6f1b6402fa54b35f82e36f))
+* ensure compatibility with previous versions of the adapter ([a2cf248](https://github.com/socketio/socket.io/commit/a2cf2486c366cb62293101c10520c57f6984a3fc))
+
+
+## [4.1.1](https://github.com/socketio/socket.io/compare/4.1.0...4.1.1) (2021-05-11)
+
+
+### Bug Fixes
+
+* **typings:** properly type server-side events ([b84ed1e](https://github.com/socketio/socket.io/commit/b84ed1e41c9053792caf58974c5de9395bfd509f))
+* **typings:** properly type the adapter attribute ([891b187](https://github.com/socketio/socket.io/commit/891b1870e92d1ec38910f03bb839817e2d6be65a))
+
+
+# [4.1.0](https://github.com/socketio/socket.io/compare/4.0.2...4.1.0) (2021-05-11)
+
+
+### Features
+
+* add support for inter-server communication ([93cce05](https://github.com/socketio/socket.io/commit/93cce05fb3faf91f21fa71212275c776aa161107))
+* notify upon namespace creation ([499c892](https://github.com/socketio/socket.io/commit/499c89250d2db1ab7725ab2b74840e188c267c46))
+* add a "connection_error" event ([7096e98](https://github.com/socketio/engine.io/commit/7096e98a02295a62c8ea2aa56461d4875887092d), from `engine.io`)
+* add the "initial_headers" and "headers" events ([2527543](https://github.com/socketio/engine.io/commit/252754353a0e88eb036ebb3082e9d6a9a5f497db), from `engine.io`)
+
+
+### Performance Improvements
+
+* add support for the "wsPreEncoded" writing option ([dc381b7](https://github.com/socketio/socket.io/commit/dc381b72c6b2f8172001dedd84116122e4cc95b3))
+
+
+## [4.0.2](https://github.com/socketio/socket.io/compare/4.0.1...4.0.2) (2021-05-06)
+
+
+### Bug Fixes
+
+* **typings:** make "engine" attribute public ([b81ce4c](https://github.com/socketio/socket.io/commit/b81ce4c9d0b00666361498e2ba5e0d007d5860b8))
+* properly export the Socket class ([d65b6ee](https://github.com/socketio/socket.io/commit/d65b6ee84c8e91deb61c3c1385eb19afa196a909))
+
+
+## [4.0.1](https://github.com/socketio/socket.io/compare/4.0.0...4.0.1) (2021-03-31)
+
+
+### Bug Fixes
+
+* **typings:** add fallback to untyped event listener ([#3834](https://github.com/socketio/socket.io/issues/3834)) ([a11152f](https://github.com/socketio/socket.io/commit/a11152f42b281df83409313962f60f230239c79e))
+* **typings:** update return type from emit ([#3843](https://github.com/socketio/socket.io/issues/3843)) ([1a72ae4](https://github.com/socketio/socket.io/commit/1a72ae4fe27a14cf60916f991a2c94da91d9e54a))
+
+
+# [4.0.0](https://github.com/socketio/socket.io/compare/3.1.2...4.0.0) (2021-03-10)
+
+
+### Bug Fixes
+
+* make io.to(...) immutable ([ac9e8ca](https://github.com/socketio/socket.io/commit/ac9e8ca6c71e00d4af45ee03f590fe56f3951186))
+
+
+### Features
+
+* add some utility methods ([b25495c](https://github.com/socketio/socket.io/commit/b25495c069031674da08e19aed68922c7c7a0e28))
+* add support for typed events ([#3822](https://github.com/socketio/socket.io/issues/3822)) ([0107510](https://github.com/socketio/socket.io/commit/0107510ba8a0f148c78029d8be8919b350feb633))
+* allow to exclude specific rooms when broadcasting ([#3789](https://github.com/socketio/socket.io/issues/3789)) ([7de2e87](https://github.com/socketio/socket.io/commit/7de2e87e888d849eb2dfc5e362af4c9e86044701))
+* allow to pass an array to io.to(...) ([085d1de](https://github.com/socketio/socket.io/commit/085d1de9df909651de8b313cc6f9f253374b702e))
+
+
 ## [3.1.2](https://github.com/socketio/socket.io/compare/3.1.1...3.1.2) (2021-02-26)
 
 

Readme.md

@@ -1,5 +1,5 @@
 # socket.io
-[![Run on Repl.it](https://repl.it/badge/github/socketio/socket.io)](https://repl.it/github/socketio/socket.io)
+[![Run on Repl.it](https://repl.it/badge/github/socketio/socket.io)](https://replit.com/@socketio/socketio-minimal-example)
 [![Backers on Open Collective](https://opencollective.com/socketio/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/socketio/sponsors/badge.svg)](#sponsors)
 [![Build Status](https://github.com/socketio/socket.io/workflows/CI/badge.svg)](https://github.com/socketio/socket.io/actions)
 [![Dependency Status](https://david-dm.org/socketio/socket.io.svg)](https://david-dm.org/socketio/socket.io)
@@ -22,7 +22,7 @@ Some implementations in other languages are also available:
 - [Swift](https://github.com/socketio/socket.io-client-swift)
 - [Dart](https://github.com/rikulo/socket.io-client-dart)
 - [Python](https://github.com/miguelgrinberg/python-socketio)
-- [.Net](https://github.com/Quobject/SocketIoClientDotNet)
+- [.NET](https://github.com/doghappy/socket.io-client-csharp)
 
 Its main features are:
 

examples/.gitignore

@@ -0,0 +1 @@
+package-lock.json

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"
   },

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

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
+```

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.

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

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

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.

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"
+}

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
+      }
+    }));
+  }
+};

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));
+  });
+});

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();
+  }
+}

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"
+    ]
+  }
+}

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
+  });
+};

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"
+  }
+}

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>

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!');
+  });
+});

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 = '';
+    }
+  }
+}

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 { }

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
+      });
+    });
+  }
+}
+

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"
+};

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.

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>

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));

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
+ */

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;
+  }
+}

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);

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"
+  ]
+}

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
+  }
+}

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"
+  ]
+}

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"
+    ]
+  }
+}

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;
+}

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;
+}

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);

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),
+        });
+      }
+    },
+  };
+}

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);
+    }
+  }
+}

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,
+  }));
+}

examples/basic-crud-application/server/package.json

@@ -0,0 +1,37 @@
+{
+  "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/mocha": "^8.2.3",
+    "@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"
+  }
+}

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();
+      });
+    });
+  });
+});

examples/basic-crud-application/server/tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "outDir": "./dist",
+    "module": "commonjs",
+    "target": "es2017",
+    "strict": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}

examples/chat/package-lock.json

@@ -1,499 +0,0 @@
-{
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-  "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",
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-        "escape-html": "~1.0.3",
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-        "socket.io-adapter": "~2.0.3",
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-      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
-      "requires": {
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-        "mime-types": "~2.1.24"
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-    "unpipe": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
-    },
-    "utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
-    },
-    "vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
-    },
-    "ws": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
-      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
-    }
-  }
-}

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"

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) {

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": {

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": {

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"

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": {

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": {

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",

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}`);

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"
   }
 }

examples/custom-parsers/public/.gitignore

@@ -0,0 +1 @@
+*.bundle.js

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) {

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 = [];

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",
-        "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": "4.0.1",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.1.tgz",
-      "integrity": "sha512-v5aZK1hlckcJDGmHz3W8xvI3NUHYc9t8QtTbqdR5OaH3S9iJZilPubauOm+vLWOMMWzpE3hiq92l9lTAHamRCg=="
-    },
-    "has-cors": {
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-      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
-      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
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-    }
-  }
-}

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"
   }
 }

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() });

examples/passport-example/package-lock.json

@@ -1,783 +0,0 @@
-{
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-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
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-      "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=="
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-      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
-      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ=="
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-    "backo2": {
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-      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
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-      "integrity": "sha1-c5JncZI7Whl0etZmqlzUv5xunOg="
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-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
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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="
-    }
-  }
-}

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"

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": {

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"
   }
 }

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",

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');

examples/tweet-stream/package-lock.json

@@ -1,705 +0,0 @@
-{
-  "name": "socket.io-tweet-stream",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
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-      "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": {
-        "safer-buffer": "~2.1.0"
-      }
-    },
-    "assert-plus": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
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-      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
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-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
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-    "aws4": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.9.1.tgz",
-      "integrity": "sha512-wMHVg2EOHaMRxbzgFJ9gtjOOCrI80OHLG14rxi28XwOW8ux6IiEbRCGGGqCtdAIg4FQCbW20k9RsT4y3gJlFug=="
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-      "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="
-    }
-  }
-}

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"
   }
 }

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=="
-    }
-  }
-}

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"
   }

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) => {

examples/webpack-build-server/index.js

@@ -0,0 +1,20 @@
+const { Server } = require("socket.io");
+
+const clientFile = require("./node_modules/socket.io/client-dist/socket.io.min?raw");
+const clientMap = require("./node_modules/socket.io/client-dist/socket.io.min.js.map?raw");
+
+Server.sendFile = (filename, req, res) => {
+  res.end(filename.endsWith(".map") ? clientMap : clientFile);
+};
+
+const io = new Server();
+
+io.on("connection", socket => {
+  console.log(`connect ${socket.id}`);
+
+  socket.on("disconnect", (reason) => {
+    console.log(`disconnect ${socket.id} due to ${reason}`);
+  });
+});
+
+io.listen(3000);

examples/webpack-build-server/lib/index.js

@@ -1,16 +0,0 @@
-
-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
-});
-const port = process.env.PORT || 3000;
-
-io.on('connect', onConnect);
-server.listen(port, () => console.log('server listening on port ' + port));
-
-function onConnect(socket){
-  console.log('connect ' + socket.id);
-
-  socket.on('disconnect', () => console.log('disconnect ' + socket.id));
-}

examples/webpack-build-server/package.json

@@ -4,13 +4,15 @@
   "description": "A sample Webpack build (for the server)",
   "scripts": {
     "start": "node dist/server.js",
-    "build": "webpack --config ./support/webpack.config.js"
+    "build": "webpack"
   },
   "author": "Damien Arrachequesne",
   "license": "MIT",
   "devDependencies": {
-    "socket.io": "~2.3.0",
-    "webpack": "~4.43.0",
-    "webpack-cli": "~3.3.11"
+    "bufferutil": "^4.0.3",
+    "socket.io": "^4.0.0",
+    "utf-8-validate": "^5.0.5",
+    "webpack": "^5.39.0",
+    "webpack-cli": "^4.7.2"
   }
 }

examples/webpack-build-server/support/webpack.config.js

@@ -1,9 +0,0 @@
-
-module.exports = {
-  entry: './lib/index.js',
-  target: 'node',
-  output: {
-    path: require('path').join(__dirname, '../dist'),
-    filename: 'server.js'
-  }
-};

examples/webpack-build-server/webpack.config.js

@@ -0,0 +1,19 @@
+const path = require("path");
+
+module.exports = {
+  entry: "./index.js",
+  target: "node",
+  mode: "production",
+  output: {
+    path: path.resolve(__dirname, "dist"),
+    filename: "index.js",
+  },
+  module: {
+    rules: [
+      {
+        resourceQuery: /raw/,
+        type: "asset/source",
+      },
+    ],
+  },
+};

examples/whiteboard/package-lock.json

@@ -1,499 +0,0 @@
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-    },
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-      "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",
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-          "requires": {
-            "ms": "^2.1.1"
-          }
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-        }
-      }
-    },
-    "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=="
-    },
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-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
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-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0"
-      },
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-          }
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-      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
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-    "toidentifier": {
-      "version": "1.0.0",
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-    },
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-      "version": "1.6.18",
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-      "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=="
-    }
-  }
-}

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"

lib/broadcast-operator.ts

@@ -0,0 +1,317 @@
+import type { BroadcastFlags, Room, SocketId } from "socket.io-adapter";
+import { Handshake, RESERVED_EVENTS, Socket } from "./socket";
+import { PacketType } from "socket.io-parser";
+import type { Adapter } from "socket.io-adapter";
+import type {
+  EventParams,
+  EventNames,
+  EventsMap,
+  TypedEventBroadcaster,
+} from "./typed-events";
+
+export class BroadcastOperator<EmitEvents extends EventsMap>
+  implements TypedEventBroadcaster<EmitEvents>
+{
+  constructor(
+    private readonly adapter: Adapter,
+    private readonly rooms: Set<Room> = new Set<Room>(),
+    private readonly exceptRooms: Set<Room> = new Set<Room>(),
+    private readonly flags: BroadcastFlags = {}
+  ) {}
+
+  /**
+   * Targets a room when emitting.
+   *
+   * @param room
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    const rooms = new Set(this.rooms);
+    if (Array.isArray(room)) {
+      room.forEach((r) => rooms.add(r));
+    } else {
+      rooms.add(room);
+    }
+    return new BroadcastOperator(
+      this.adapter,
+      rooms,
+      this.exceptRooms,
+      this.flags
+    );
+  }
+
+  /**
+   * Targets a room when emitting.
+   *
+   * @param room
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.to(room);
+  }
+
+  /**
+   * Excludes a room when emitting.
+   *
+   * @param room
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    const exceptRooms = new Set(this.exceptRooms);
+    if (Array.isArray(room)) {
+      room.forEach((r) => exceptRooms.add(r));
+    } else {
+      exceptRooms.add(room);
+    }
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      exceptRooms,
+      this.flags
+    );
+  }
+
+  /**
+   * Sets the compress flag.
+   *
+   * @param compress - if `true`, compresses the sending data
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags, { compress });
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      this.exceptRooms,
+      flags
+    );
+  }
+
+  /**
+   * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
+   * receive messages (because of network slowness or other issues, or because they’re connected through long polling
+   * and is in the middle of a request-response cycle).
+   *
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public get volatile(): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags, { volatile: true });
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      this.exceptRooms,
+      flags
+    );
+  }
+
+  /**
+   * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
+   *
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public get local(): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags, { local: true });
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      this.exceptRooms,
+      flags
+    );
+  }
+
+  /**
+   * Emits to all clients.
+   *
+   * @return Always true
+   * @public
+   */
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    if (RESERVED_EVENTS.has(ev)) {
+      throw new Error(`"${ev}" is a reserved event name`);
+    }
+    // set up packet object
+    const data = [ev, ...args];
+    const packet = {
+      type: PacketType.EVENT,
+      data: data,
+    };
+
+    if ("function" == typeof data[data.length - 1]) {
+      throw new Error("Callbacks are not supported when broadcasting");
+    }
+
+    this.adapter.broadcast(packet, {
+      rooms: this.rooms,
+      except: this.exceptRooms,
+      flags: this.flags,
+    });
+
+    return true;
+  }
+
+  /**
+   * Gets a list of clients.
+   *
+   * @public
+   */
+  public allSockets(): Promise<Set<SocketId>> {
+    if (!this.adapter) {
+      throw new Error(
+        "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
+      );
+    }
+    return this.adapter.sockets(this.rooms);
+  }
+
+  /**
+   * Returns the matching socket instances
+   *
+   * @public
+   */
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+    return this.adapter
+      .fetchSockets({
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      })
+      .then((sockets) => {
+        return sockets.map((socket) => {
+          if (socket instanceof Socket) {
+            // FIXME the TypeScript compiler complains about missing private properties
+            return socket as unknown as RemoteSocket<EmitEvents>;
+          } else {
+            return new RemoteSocket(this.adapter, socket as SocketDetails);
+          }
+        });
+      });
+  }
+
+  /**
+   * Makes the matching socket instances join the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsJoin(room: Room | Room[]): void {
+    this.adapter.addSockets(
+      {
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      },
+      Array.isArray(room) ? room : [room]
+    );
+  }
+
+  /**
+   * Makes the matching socket instances leave the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsLeave(room: Room | Room[]): void {
+    this.adapter.delSockets(
+      {
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      },
+      Array.isArray(room) ? room : [room]
+    );
+  }
+
+  /**
+   * Makes the matching socket instances disconnect
+   *
+   * @param close - whether to close the underlying connection
+   * @public
+   */
+  public disconnectSockets(close: boolean = false): void {
+    this.adapter.disconnectSockets(
+      {
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      },
+      close
+    );
+  }
+}
+
+/**
+ * Format of the data when the Socket instance exists on another Socket.IO server
+ */
+interface SocketDetails {
+  id: SocketId;
+  handshake: Handshake;
+  rooms: Room[];
+  data: any;
+}
+
+/**
+ * Expose of subset of the attributes and methods of the Socket class
+ */
+export class RemoteSocket<EmitEvents extends EventsMap>
+  implements TypedEventBroadcaster<EmitEvents>
+{
+  public readonly id: SocketId;
+  public readonly handshake: Handshake;
+  public readonly rooms: Set<Room>;
+  public readonly data: any;
+
+  private readonly operator: BroadcastOperator<EmitEvents>;
+
+  constructor(adapter: Adapter, details: SocketDetails) {
+    this.id = details.id;
+    this.handshake = details.handshake;
+    this.rooms = new Set(details.rooms);
+    this.data = details.data;
+    this.operator = new BroadcastOperator(adapter, new Set([this.id]));
+  }
+
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    return this.operator.emit(ev, ...args);
+  }
+
+  /**
+   * Joins a room.
+   *
+   * @param {String|Array} room - room or array of rooms
+   * @public
+   */
+  public join(room: Room | Room[]): void {
+    return this.operator.socketsJoin(room);
+  }
+
+  /**
+   * Leaves a room.
+   *
+   * @param {String} room
+   * @public
+   */
+  public leave(room: Room): void {
+    return this.operator.socketsLeave(room);
+  }
+
+  /**
+   * Disconnects this client.
+   *
+   * @param {Boolean} close - if `true`, closes the underlying connection
+   * @return {Socket} self
+   *
+   * @public
+   */
+  public disconnect(close = false): this {
+    this.operator.disconnectSockets(close);
+    return this;
+  }
+}

lib/client.ts

@@ -2,21 +2,41 @@ 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";
+import type { Socket as RawSocket } from "engine.io";
 
 const debug = debugModule("socket.io:client");
 
-export class Client {
-  public readonly conn;
+interface WriteOptions {
+  compress?: boolean;
+  volatile?: boolean;
+  preEncoded?: boolean;
+  wsPreEncoded?: string;
+}
+
+export class Client<
+  ListenEvents extends EventsMap,
+  EmitEvents extends EventsMap,
+  ServerSideEvents extends EventsMap
+> {
+  public readonly conn: RawSocket;
 
   private readonly id: string;
-  private readonly server: Server;
+  private readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>;
   private readonly encoder: Encoder;
   private readonly decoder: Decoder;
-  private sockets: Map<SocketId, Socket> = new Map();
-  private nsps: Map<string, Socket> = new Map();
+  private sockets: Map<
+    SocketId,
+    Socket<ListenEvents, EmitEvents, ServerSideEvents>
+  > = new Map();
+  private nsps: Map<
+    string,
+    Socket<ListenEvents, EmitEvents, ServerSideEvents>
+  > = new Map();
   private connectTimeout?: NodeJS.Timeout;
 
   /**
@@ -26,7 +46,10 @@ export class Client {
    * @param conn
    * @package
    */
-  constructor(server: Server, conn: Socket) {
+  constructor(
+    server: Server<ListenEvents, EmitEvents, ServerSideEvents>,
+    conn: any
+  ) {
     this.server = server;
     this.conn = conn;
     this.encoder = server.encoder;
@@ -87,7 +110,11 @@ export class Client {
     this.server._checkNamespace(
       name,
       auth,
-      (dynamicNspName: Namespace | false) => {
+      (
+        dynamicNspName:
+          | Namespace<ListenEvents, EmitEvents, ServerSideEvents>
+          | false
+      ) => {
         if (dynamicNspName) {
           debug("dynamic namespace %s was created", dynamicNspName);
           this.doConnect(name, auth);
@@ -145,7 +172,7 @@ export class Client {
    *
    * @private
    */
-  _remove(socket: Socket): void {
+  _remove(socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>): void {
     if (this.sockets.has(socket.id)) {
       const nsp = this.sockets.get(socket.id)!.nsp.name;
       this.sockets.delete(socket.id);
@@ -175,30 +202,32 @@ export class Client {
    * @param {Object} opts
    * @private
    */
-  _packet(packet: Packet, opts?: any): void {
-    opts = opts || {};
-    const self = this;
-
-    // this writes to the actual connection
-    function writeToEngine(encodedPackets: any) {
-      // TODO clarify this.
-      if (opts.volatile && !self.conn.transport.writable) return;
-      for (let i = 0; i < encodedPackets.length; i++) {
-        self.conn.write(encodedPackets[i], { compress: opts.compress });
-      }
-    }
-
-    if ("open" === this.conn.readyState) {
-      debug("writing packet %j", packet);
-      if (!opts.preEncoded) {
-        // not broadcasting, need to encode
-        writeToEngine(this.encoder.encode(packet)); // encode, then write results to engine
-      } else {
-        // a broadcast pre-encodes a packet
-        writeToEngine(packet);
-      }
-    } else {
+  _packet(packet: Packet | any[], opts: WriteOptions = {}): void {
+    if (this.conn.readyState !== "open") {
       debug("ignoring packet write %j", packet);
+      return;
+    }
+    const encodedPackets = opts.preEncoded
+      ? (packet as any[]) // previous versions of the adapter incorrectly used socket.packet() instead of writeToEngine()
+      : this.encoder.encode(packet as Packet);
+    this.writeToEngine(encodedPackets, opts);
+  }
+
+  private writeToEngine(
+    encodedPackets: Array<String | Buffer>,
+    opts: WriteOptions
+  ): void {
+    if (opts.volatile && !this.conn.transport.writable) {
+      debug(
+        "volatile packet is discarded since the transport is not currently writable"
+      );
+      return;
+    }
+    const packets = Array.isArray(encodedPackets)
+      ? encodedPackets
+      : [encodedPackets];
+    for (const encodedPacket of packets) {
+      this.conn.write(encodedPacket, opts);
     }
   }
 

lib/index.ts

@@ -4,130 +4,44 @@ import { createDeflate, createGzip, createBrotliCompress } from "zlib";
 import accepts = require("accepts");
 import { pipeline } from "stream";
 import path = require("path");
-import engine = require("engine.io");
+import {
+  attach,
+  Server as Engine,
+  ServerOptions as EngineOptions,
+  AttachOptions,
+} from "engine.io";
 import { Client } from "./client";
 import { EventEmitter } from "events";
-import { ExtendedError, Namespace } from "./namespace";
+import { ExtendedError, Namespace, ServerReservedEventsMap } from "./namespace";
 import { ParentNamespace } from "./parent-namespace";
 import { Adapter, Room, SocketId } from "socket.io-adapter";
 import * as parser from "socket.io-parser";
 import type { Encoder } from "socket.io-parser";
 import debugModule from "debug";
 import { Socket } from "./socket";
-import type { CookieSerializeOptions } from "cookie";
-import type { CorsOptions } from "cors";
+import type { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
+import {
+  EventsMap,
+  DefaultEventsMap,
+  EventParams,
+  StrictEventEmitter,
+  EventNames,
+} from "./typed-events";
 
 const debug = debugModule("socket.io:server");
 
 const clientVersion = require("../package.json").version;
 const dotMapRegex = /\.map/;
 
-type Transport = "polling" | "websocket";
 type ParentNspNameMatchFn = (
   name: string,
   auth: { [key: string]: any },
   fn: (err: Error | null, success: boolean) => void
 ) => void;
 
-interface EngineOptions {
-  /**
-   * how many ms without a pong packet to consider the connection closed
-   * @default 5000
-   */
-  pingTimeout: number;
-  /**
-   * how many ms before sending a new ping packet
-   * @default 25000
-   */
-  pingInterval: number;
-  /**
-   * how many ms before an uncompleted transport upgrade is cancelled
-   * @default 10000
-   */
-  upgradeTimeout: number;
-  /**
-   * how many bytes or characters a message can be, before closing the session (to avoid DoS).
-   * @default 1e5 (100 KB)
-   */
-  maxHttpBufferSize: number;
-  /**
-   * A function that receives a given handshake or upgrade request as its first parameter,
-   * and can decide whether to continue or not. The second argument is a function that needs
-   * to be called with the decided information: fn(err, success), where success is a boolean
-   * value where false means that the request is rejected, and err is an error code.
-   */
-  allowRequest: (
-    req: http.IncomingMessage,
-    fn: (err: string | null | undefined, success: boolean) => void
-  ) => void;
-  /**
-   * the low-level transports that are enabled
-   * @default ["polling", "websocket"]
-   */
-  transports: Transport[];
-  /**
-   * whether to allow transport upgrades
-   * @default true
-   */
-  allowUpgrades: boolean;
-  /**
-   * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
-   * @default false
-   */
-  perMessageDeflate: boolean | object;
-  /**
-   * parameters of the http compression for the polling transports (see zlib api docs). Set to false to disable.
-   * @default true
-   */
-  httpCompression: boolean | object;
-  /**
-   * what WebSocket server implementation to use. Specified module must
-   * conform to the ws interface (see ws module api docs). Default value is ws.
-   * An alternative c++ addon is also available by installing uws module.
-   */
-  wsEngine: string;
-  /**
-   * an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
-   */
-  initialPacket: any;
-  /**
-   * configuration of the cookie that contains the client sid to send as part of handshake response headers. This cookie
-   * might be used for sticky-session. Defaults to not sending any cookie.
-   * @default false
-   */
-  cookie: CookieSerializeOptions | boolean;
-  /**
-   * the options that will be forwarded to the cors module
-   */
-  cors: CorsOptions;
-  /**
-   * whether to enable compatibility with Socket.IO v2 clients
-   * @default false
-   */
-  allowEIO3: boolean;
-}
+type AdapterConstructor = typeof Adapter | ((nsp: Namespace) => Adapter);
 
-interface AttachOptions {
-  /**
-   * name of the path to capture
-   * @default "/engine.io"
-   */
-  path: string;
-  /**
-   * destroy unhandled upgrade requests
-   * @default true
-   */
-  destroyUpgrade: boolean;
-  /**
-   * milliseconds after which unhandled requests are ended
-   * @default 1000
-   */
-  destroyUpgradeTimeout: number;
-}
-
-interface EngineAttachOptions extends EngineOptions, AttachOptions {}
-
-interface ServerOptions extends EngineAttachOptions {
+interface ServerOptions extends EngineOptions, AttachOptions {
   /**
    * name of the path to capture
    * @default "/socket.io"
@@ -142,7 +56,7 @@ interface ServerOptions extends EngineAttachOptions {
    * the adapter to use
    * @default the in-memory adapter (https://github.com/socketio/socket.io-adapter)
    */
-  adapter: any;
+  adapter: AdapterConstructor;
   /**
    * the parser to use
    * @default the default parser (https://github.com/socketio/socket.io-parser)
@@ -155,8 +69,31 @@ interface ServerOptions extends EngineAttachOptions {
   connectTimeout: number;
 }
 
-export class Server extends EventEmitter {
-  public readonly sockets: Namespace;
+export class Server<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents,
+  ServerSideEvents extends EventsMap = DefaultEventsMap
+> extends StrictEventEmitter<
+  ServerSideEvents,
+  EmitEvents,
+  ServerReservedEventsMap<ListenEvents, EmitEvents, ServerSideEvents>
+> {
+  public readonly sockets: Namespace<
+    ListenEvents,
+    EmitEvents,
+    ServerSideEvents
+  >;
+  /**
+   * A reference to the underlying Engine.IO server.
+   *
+   * Example:
+   *
+   * <code>
+   *   const clientsCount = io.engine.clientsCount;
+   * </code>
+   *
+   */
+  public engine: any;
 
   /** @private */
   readonly _parser: typeof parser;
@@ -166,13 +103,16 @@ export class Server extends EventEmitter {
   /**
    * @private
    */
-  _nsps: Map<string, Namespace> = new Map();
-  private parentNsps: Map<ParentNspNameMatchFn, ParentNamespace> = new Map();
-  private _adapter?: typeof Adapter;
+  _nsps: Map<string, Namespace<ListenEvents, EmitEvents, ServerSideEvents>> =
+    new Map();
+  private parentNsps: Map<
+    ParentNspNameMatchFn,
+    ParentNamespace<ListenEvents, EmitEvents, ServerSideEvents>
+  > = new Map();
+  private _adapter?: AdapterConstructor;
   private _serveClient: boolean;
   private opts: Partial<EngineOptions>;
-  private eio;
-  private engine;
+  private eio: Engine;
   private _path: string;
   private clientPathRegex: RegExp;
 
@@ -216,7 +156,7 @@ export class Server extends EventEmitter {
     this.adapter(opts.adapter || Adapter);
     this.sockets = this.of("/");
     this.opts = opts;
-    if (srv) this.attach(srv as http.Server);
+    if (srv || typeof srv == "number") this.attach(srv as http.Server | number);
   }
 
   /**
@@ -247,7 +187,9 @@ export class Server extends EventEmitter {
   _checkNamespace(
     name: string,
     auth: { [key: string]: any },
-    fn: (nsp: Namespace | false) => void
+    fn: (
+      nsp: Namespace<ListenEvents, EmitEvents, ServerSideEvents> | false
+    ) => void
   ): void {
     if (this.parentNsps.size === 0) return fn(false);
 
@@ -262,7 +204,12 @@ export class Server extends EventEmitter {
         if (err || !allow) {
           run();
         } else {
-          fn(this.parentNsps.get(nextFn.value)!.createChild(name));
+          const namespace = this.parentNsps
+            .get(nextFn.value)!
+            .createChild(name);
+          // @ts-ignore
+          this.sockets.emitReserved("new_namespace", namespace);
+          fn(namespace);
         }
       });
     };
@@ -289,7 +236,7 @@ export class Server extends EventEmitter {
     this.clientPathRegex = new RegExp(
       "^" +
         escapedPath +
-        "/socket\\.io(\\.min|\\.msgpack\\.min)?\\.js(\\.map)?$"
+        "/socket\\.io(\\.msgpack|\\.esm)?(\\.min)?\\.js(\\.map)?(?:\\?|$)"
     );
     return this;
   }
@@ -315,10 +262,11 @@ export class Server extends EventEmitter {
    * @return self when setting or value when getting
    * @public
    */
-  public adapter(): typeof Adapter | undefined;
-  public adapter(v: typeof Adapter): this;
-  public adapter(v?: typeof Adapter): typeof Adapter | undefined | this;
-  public adapter(v?: typeof Adapter): typeof Adapter | undefined | this {
+  public adapter(): AdapterConstructor | undefined;
+  public adapter(v: AdapterConstructor): this;
+  public adapter(
+    v?: AdapterConstructor
+  ): AdapterConstructor | undefined | this {
     if (!arguments.length) return this._adapter;
     this._adapter = v;
     for (const nsp of this._nsps.values()) {
@@ -395,11 +343,11 @@ export class Server extends EventEmitter {
    */
   private initEngine(
     srv: http.Server,
-    opts: Partial<EngineAttachOptions>
+    opts: EngineOptions & AttachOptions
   ): void {
     // initialize engine
     debug("creating engine.io instance with opts %j", opts);
-    this.eio = engine.attach(srv, opts);
+    this.eio = attach(srv, opts);
 
     // attach static file serving
     if (this._serveClient) this.attachServe(srv);
@@ -423,7 +371,7 @@ export class Server extends EventEmitter {
     const evs = srv.listeners("request").slice(0);
     srv.removeAllListeners("request");
     srv.on("request", (req, res) => {
-      if (this.clientPathRegex.test(req.url)) {
+      if (this.clientPathRegex.test(req.url!)) {
         this.serve(req, res);
       } else {
         for (let i = 0; i < evs.length; i++) {
@@ -441,7 +389,7 @@ export class Server extends EventEmitter {
    * @private
    */
   private serve(req: http.IncomingMessage, res: http.ServerResponse): void {
-    const filename = req.url!.replace(this._path, "");
+    const filename = req.url!.replace(this._path, "").replace(/\?.*$/, "");
     const isMap = dotMapRegex.test(filename);
     const type = isMap ? "map" : "source";
 
@@ -469,9 +417,6 @@ export class Server extends EventEmitter {
     );
     res.setHeader("ETag", expectedEtag);
 
-    if (!isMap) {
-      res.setHeader("X-SourceMap", filename.substring(1) + ".map");
-    }
     Server.sendFile(filename, req, res);
   }
 
@@ -556,8 +501,8 @@ export class Server extends EventEmitter {
    */
   public of(
     name: string | RegExp | ParentNspNameMatchFn,
-    fn?: (socket: Socket) => void
-  ): Namespace {
+    fn?: (socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>) => void
+  ): Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
     if (typeof name === "function" || name instanceof RegExp) {
       const parentNsp = new ParentNamespace(this);
       debug("initializing parent namespace %s", parentNsp.name);
@@ -583,6 +528,10 @@ export class Server extends EventEmitter {
       debug("initializing namespace %s", name);
       nsp = new Namespace(this, name);
       this._nsps.set(name, nsp);
+      if (name !== "/") {
+        // @ts-ignore
+        this.sockets.emitReserved("new_namespace", nsp);
+      }
     }
     if (fn) nsp.on("connect", fn);
     return nsp;
@@ -615,7 +564,10 @@ export class Server extends EventEmitter {
    * @public
    */
   public use(
-    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
+    fn: (
+      socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   ): this {
     this.sockets.use(fn);
     return this;
@@ -624,25 +576,34 @@ export class Server extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public to(name: Room): this {
-    this.sockets.to(name);
-    return this;
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.sockets.to(room);
   }
 
   /**
    * Targets a room when emitting.
    *
+   * @param room
+   * @return self
+   * @public
+   */
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.sockets.in(room);
+  }
+
+  /**
+   * Excludes a room when emitting.
+   *
    * @param name
    * @return self
    * @public
    */
-  public in(name: Room): this {
-    this.sockets.in(name);
-    return this;
+  public except(name: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.sockets.except(name);
   }
 
   /**
@@ -651,7 +612,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.sockets.emit("message", ...args);
     return this;
   }
@@ -662,11 +623,25 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.sockets.emit("message", ...args);
     return this;
   }
 
+  /**
+   * Emit a packet to other Socket.IO servers
+   *
+   * @param ev - the event name
+   * @param args - an array of arguments, which may include an acknowledgement callback at the end
+   * @public
+   */
+  public serverSideEmit<Ev extends EventNames<ServerSideEvents>>(
+    ev: Ev,
+    ...args: EventParams<ServerSideEvents, Ev>
+  ): boolean {
+    return this.sockets.serverSideEmit(ev, ...args);
+  }
+
   /**
    * Gets a list of socket ids.
    *
@@ -683,9 +658,8 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public compress(compress: boolean): this {
-    this.sockets.compress(compress);
-    return this;
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+    return this.sockets.compress(compress);
   }
 
   /**
@@ -696,9 +670,8 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public get volatile(): this {
-    this.sockets.volatile;
-    return this;
+  public get volatile(): BroadcastOperator<EmitEvents> {
+    return this.sockets.volatile;
   }
 
   /**
@@ -707,9 +680,47 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public get local(): this {
-    this.sockets.local;
-    return this;
+  public get local(): BroadcastOperator<EmitEvents> {
+    return this.sockets.local;
+  }
+
+  /**
+   * Returns the matching socket instances
+   *
+   * @public
+   */
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+    return this.sockets.fetchSockets();
+  }
+
+  /**
+   * Makes the matching socket instances join the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsJoin(room: Room | Room[]): void {
+    return this.sockets.socketsJoin(room);
+  }
+
+  /**
+   * Makes the matching socket instances leave the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsLeave(room: Room | Room[]): void {
+    return this.sockets.socketsLeave(room);
+  }
+
+  /**
+   * Makes the matching socket instances disconnect
+   *
+   * @param close - whether to close the underlying connection
+   * @public
+   */
+  public disconnectSockets(close: boolean = false): void {
+    return this.sockets.disconnectSockets(close);
   }
 }
 
@@ -731,5 +742,7 @@ 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 };
+export { Socket, ServerOptions, Namespace, BroadcastOperator, RemoteSocket };

lib/namespace.ts

@@ -1,10 +1,16 @@
-import { Socket, RESERVED_EVENTS } from "./socket";
+import { Socket } from "./socket";
 import type { Server } from "./index";
+import {
+  EventParams,
+  EventNames,
+  EventsMap,
+  StrictEventEmitter,
+  DefaultEventsMap,
+} from "./typed-events";
 import type { Client } from "./client";
-import { EventEmitter } from "events";
-import { PacketType } from "socket.io-parser";
 import debugModule from "debug";
 import type { Adapter, Room, SocketId } from "socket.io-adapter";
+import { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
 
 const debug = debugModule("socket.io:namespace");
 
@@ -12,26 +18,63 @@ export interface ExtendedError extends Error {
   data?: any;
 }
 
-export class Namespace extends EventEmitter {
+export interface NamespaceReservedEventsMap<
+  ListenEvents extends EventsMap,
+  EmitEvents extends EventsMap,
+  ServerSideEvents extends EventsMap
+> {
+  connect: (socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>) => void;
+  connection: (
+    socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>
+  ) => void;
+}
+
+export interface ServerReservedEventsMap<
+  ListenEvents,
+  EmitEvents,
+  ServerSideEvents
+> extends NamespaceReservedEventsMap<
+    ListenEvents,
+    EmitEvents,
+    ServerSideEvents
+  > {
+  new_namespace: (
+    namespace: Namespace<ListenEvents, EmitEvents, ServerSideEvents>
+  ) => void;
+}
+
+export const RESERVED_EVENTS: ReadonlySet<string | Symbol> = new Set<
+  keyof ServerReservedEventsMap<never, never, never>
+>(<const>["connect", "connection", "new_namespace"]);
+
+export class Namespace<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents,
+  ServerSideEvents extends EventsMap = DefaultEventsMap
+> extends StrictEventEmitter<
+  ServerSideEvents,
+  EmitEvents,
+  NamespaceReservedEventsMap<ListenEvents, EmitEvents, ServerSideEvents>
+> {
   public readonly name: string;
-  public readonly sockets: Map<SocketId, Socket> = new Map();
+  public readonly sockets: Map<
+    SocketId,
+    Socket<ListenEvents, EmitEvents, ServerSideEvents>
+  > = new Map();
 
   public adapter: Adapter;
 
   /** @private */
-  readonly server: Server;
+  readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>;
 
   /** @private */
   _fns: Array<
-    (socket: Socket, next: (err?: ExtendedError) => void) => void
+    (
+      socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   > = [];
 
-  /** @private */
-  _rooms: Set<Room> = new Set();
-
-  /** @private */
-  _flags: any = {};
-
   /** @private */
   _ids: number = 0;
 
@@ -41,7 +84,10 @@ export class Namespace extends EventEmitter {
    * @param server instance
    * @param name
    */
-  constructor(server: Server, name: string) {
+  constructor(
+    server: Server<ListenEvents, EmitEvents, ServerSideEvents>,
+    name: string
+  ) {
     super();
     this.server = server;
     this.name = name;
@@ -56,6 +102,7 @@ export class Namespace extends EventEmitter {
    * @private
    */
   _initAdapter(): void {
+    // @ts-ignore
     this.adapter = new (this.server.adapter()!)(this);
   }
 
@@ -66,7 +113,10 @@ export class Namespace extends EventEmitter {
    * @public
    */
   public use(
-    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
+    fn: (
+      socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   ): this {
     this._fns.push(fn);
     return this;
@@ -79,7 +129,10 @@ export class Namespace extends EventEmitter {
    * @param fn - last fn call in the middleware
    * @private
    */
-  private run(socket: Socket, fn: (err: ExtendedError | null) => void) {
+  private run(
+    socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+    fn: (err: ExtendedError | null) => void
+  ) {
     const fns = this._fns.slice(0);
     if (!fns.length) return fn(null);
 
@@ -102,25 +155,34 @@ export class Namespace extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public to(name: Room): this {
-    this._rooms.add(name);
-    return this;
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).to(room);
   }
 
   /**
    * Targets a room when emitting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public in(name: Room): this {
-    this._rooms.add(name);
-    return this;
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).in(room);
+  }
+
+  /**
+   * Excludes a room when emitting.
+   *
+   * @param room
+   * @return self
+   * @public
+   */
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).except(room);
   }
 
   /**
@@ -129,7 +191,11 @@ export class Namespace extends EventEmitter {
    * @return {Socket}
    * @private
    */
-  _add(client: Client, query, fn?: () => void): Socket {
+  _add(
+    client: Client<ListenEvents, EmitEvents, ServerSideEvents>,
+    query,
+    fn?: () => void
+  ): Socket<ListenEvents, EmitEvents, ServerSideEvents> {
     debug("adding socket to nsp %s", this.name);
     const socket = new Socket(this, client, query);
     this.run(socket, (err) => {
@@ -157,8 +223,8 @@ export class Namespace extends EventEmitter {
           if (fn) fn();
 
           // fire user-set events
-          super.emit("connect", socket);
-          super.emit("connection", socket);
+          this.emitReserved("connect", socket);
+          this.emitReserved("connection", socket);
         } else {
           debug("next called after client was closed - ignoring socket");
         }
@@ -172,7 +238,7 @@ export class Namespace extends EventEmitter {
    *
    * @private
    */
-  _remove(socket: Socket): void {
+  _remove(socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>): void {
     if (this.sockets.has(socket.id)) {
       this.sockets.delete(socket.id);
     } else {
@@ -186,56 +252,63 @@ export class Namespace extends EventEmitter {
    * @return Always true
    * @public
    */
-  public emit(ev: string | Symbol, ...args: any[]): true {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    return new BroadcastOperator<EmitEvents>(this.adapter).emit(ev, ...args);
+  }
+
+  /**
+   * Sends a `message` event to all clients.
+   *
+   * @return self
+   * @public
+   */
+  public send(...args: EventParams<EmitEvents, "message">): this {
+    this.emit("message", ...args);
+    return this;
+  }
+
+  /**
+   * Sends a `message` event to all clients.
+   *
+   * @return self
+   * @public
+   */
+  public write(...args: EventParams<EmitEvents, "message">): this {
+    this.emit("message", ...args);
+    return this;
+  }
+
+  /**
+   * Emit a packet to other Socket.IO servers
+   *
+   * @param ev - the event name
+   * @param args - an array of arguments, which may include an acknowledgement callback at the end
+   * @public
+   */
+  public serverSideEmit<Ev extends EventNames<ServerSideEvents>>(
+    ev: Ev,
+    ...args: EventParams<ServerSideEvents, Ev>
+  ): boolean {
     if (RESERVED_EVENTS.has(ev)) {
       throw new Error(`"${ev}" is a reserved event name`);
     }
-    // set up packet object
     args.unshift(ev);
-    const packet = {
-      type: PacketType.EVENT,
-      data: args,
-    };
-
-    if ("function" == typeof args[args.length - 1]) {
-      throw new Error("Callbacks are not supported when broadcasting");
-    }
-
-    const rooms = new Set(this._rooms);
-    const flags = Object.assign({}, this._flags);
-
-    // reset flags
-    this._rooms.clear();
-    this._flags = {};
-
-    this.adapter.broadcast(packet, {
-      rooms: rooms,
-      flags: flags,
-    });
-
+    this.adapter.serverSideEmit(args);
     return true;
   }
 
   /**
-   * Sends a `message` event to all clients.
+   * Called when a packet is received from another Socket.IO server
    *
-   * @return self
-   * @public
-   */
-  public send(...args: readonly any[]): this {
-    this.emit("message", ...args);
-    return this;
-  }
-
-  /**
-   * Sends a `message` event to all clients.
+   * @param args - an array of arguments, which may include an acknowledgement callback at the end
    *
-   * @return self
-   * @public
+   * @private
    */
-  public write(...args: readonly any[]): this {
-    this.emit("message", ...args);
-    return this;
+  _onServerSideEmit(args: [string, ...any[]]) {
+    super.emitUntyped.apply(this, args);
   }
 
   /**
@@ -245,14 +318,7 @@ export class Namespace extends EventEmitter {
    * @public
    */
   public allSockets(): Promise<Set<SocketId>> {
-    if (!this.adapter) {
-      throw new Error(
-        "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
-      );
-    }
-    const rooms = new Set(this._rooms);
-    this._rooms.clear();
-    return this.adapter.sockets(rooms);
+    return new BroadcastOperator(this.adapter).allSockets();
   }
 
   /**
@@ -262,9 +328,8 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public compress(compress: boolean): this {
-    this._flags.compress = compress;
-    return this;
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).compress(compress);
   }
 
   /**
@@ -275,9 +340,8 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public get volatile(): this {
-    this._flags.volatile = true;
-    return this;
+  public get volatile(): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).volatile;
   }
 
   /**
@@ -286,8 +350,46 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public get local(): this {
-    this._flags.local = true;
-    return this;
+  public get local(): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).local;
+  }
+
+  /**
+   * Returns the matching socket instances
+   *
+   * @public
+   */
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+    return new BroadcastOperator(this.adapter).fetchSockets();
+  }
+
+  /**
+   * Makes the matching socket instances join the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsJoin(room: Room | Room[]): void {
+    return new BroadcastOperator(this.adapter).socketsJoin(room);
+  }
+
+  /**
+   * Makes the matching socket instances leave the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsLeave(room: Room | Room[]): void {
+    return new BroadcastOperator(this.adapter).socketsLeave(room);
+  }
+
+  /**
+   * Makes the matching socket instances disconnect
+   *
+   * @param close - whether to close the underlying connection
+   * @public
+   */
+  public disconnectSockets(close: boolean = false): void {
+    return new BroadcastOperator(this.adapter).disconnectSockets(close);
   }
 }

lib/parent-namespace.ts

@@ -1,11 +1,23 @@
 import { Namespace } from "./namespace";
 import type { Server } from "./index";
+import type {
+  EventParams,
+  EventNames,
+  EventsMap,
+  DefaultEventsMap,
+} from "./typed-events";
+import type { BroadcastOptions } from "socket.io-adapter";
 
-export class ParentNamespace extends Namespace {
+export class ParentNamespace<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents,
+  ServerSideEvents extends EventsMap = DefaultEventsMap
+> extends Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
   private static count: number = 0;
-  private children: Set<Namespace> = new Set();
+  private children: Set<Namespace<ListenEvents, EmitEvents, ServerSideEvents>> =
+    new Set();
 
-  constructor(server: Server) {
+  constructor(server: Server<ListenEvents, EmitEvents, ServerSideEvents>) {
     super(server, "/_" + ParentNamespace.count++);
   }
 
@@ -13,29 +25,36 @@ export class ParentNamespace extends Namespace {
    * @private
    */
   _initAdapter(): void {
-    /* no-op */
+    const broadcast = (packet: any, opts: BroadcastOptions) => {
+      this.children.forEach((nsp) => {
+        nsp.adapter.broadcast(packet, opts);
+      });
+    };
+    // @ts-ignore FIXME is there a way to declare an inner class in TypeScript?
+    this.adapter = { broadcast };
   }
 
-  public emit(ev: string | Symbol, ...args: [...any]): true {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
     this.children.forEach((nsp) => {
-      nsp._rooms = this._rooms;
-      nsp._flags = this._flags;
       nsp.emit(ev, ...args);
     });
-    this._rooms.clear();
-    this._flags = {};
 
     return true;
   }
 
-  createChild(name: string): Namespace {
+  createChild(
+    name: string
+  ): Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
     const namespace = new Namespace(this.server, name);
     namespace._fns = this._fns.slice(0);
     this.listeners("connect").forEach((listener) =>
-      namespace.on("connect", listener as (...args: any[]) => void)
+      namespace.on("connect", listener)
     );
     this.listeners("connection").forEach((listener) =>
-      namespace.on("connection", listener as (...args: any[]) => void)
+      namespace.on("connection", listener)
     );
     this.children.add(namespace);
     this.server._nsps.set(name, namespace);

lib/socket.ts

@@ -1,10 +1,16 @@
-import { EventEmitter } from "events";
 import { Packet, PacketType } from "socket.io-parser";
 import url = require("url");
 import debugModule from "debug";
 import type { Server } from "./index";
+import {
+  EventParams,
+  EventNames,
+  EventsMap,
+  StrictEventEmitter,
+  DefaultEventsMap,
+} from "./typed-events";
 import type { Client } from "./client";
-import type { Namespace } from "./namespace";
+import type { Namespace, NamespaceReservedEventsMap } from "./namespace";
 import type { IncomingMessage, IncomingHttpHeaders } from "http";
 import type {
   Adapter,
@@ -14,18 +20,43 @@ import type {
 } from "socket.io-adapter";
 import base64id from "base64id";
 import type { ParsedUrlQuery } from "querystring";
+import { BroadcastOperator } from "./broadcast-operator";
 
 const debug = debugModule("socket.io:socket");
 
-export const RESERVED_EVENTS = new Set(<const>[
+type ClientReservedEvents = "connect_error";
+
+export interface SocketReservedEventsMap {
+  disconnect: (reason: string) => void;
+  disconnecting: (reason: string) => void;
+  error: (err: Error) => void;
+}
+
+// EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
+export interface EventEmitterReservedEventsMap {
+  newListener: (
+    eventName: string | Symbol,
+    listener: (...args: any[]) => void
+  ) => void;
+  removeListener: (
+    eventName: string | Symbol,
+    listener: (...args: any[]) => void
+  ) => void;
+}
+
+export const RESERVED_EVENTS: ReadonlySet<string | Symbol> = new Set<
+  | ClientReservedEvents
+  | keyof NamespaceReservedEventsMap<never, never, never>
+  | keyof SocketReservedEventsMap
+  | keyof EventEmitterReservedEventsMap
+>(<const>[
   "connect",
   "connect_error",
   "disconnect",
   "disconnecting",
-  // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
   "newListener",
   "removeListener",
-]) as ReadonlySet<string | Symbol>;
+]);
 
 /**
  * The handshake details
@@ -77,21 +108,31 @@ export interface Handshake {
   auth: { [key: string]: any };
 }
 
-export class Socket extends EventEmitter {
+export class Socket<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents,
+  ServerSideEvents extends EventsMap = DefaultEventsMap
+> extends StrictEventEmitter<
+  ListenEvents,
+  EmitEvents,
+  SocketReservedEventsMap
+> {
   public readonly id: SocketId;
   public readonly handshake: Handshake;
+  /**
+   * Additional information that can be attached to the Socket instance and which will be used in the fetchSockets method
+   */
+  public data: any = {};
 
   public connected: boolean;
   public disconnected: boolean;
 
-  private readonly server: Server;
+  private readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>;
   private readonly adapter: Adapter;
   private acks: Map<number, () => void> = new Map();
-  private fns: Array<
-    (event: Array<any>, next: (err: Error) => void) => void
-  > = [];
+  private fns: Array<(event: Array<any>, next: (err?: Error) => void) => void> =
+    [];
   private flags: BroadcastFlags = {};
-  private _rooms: Set<Room> = new Set();
   private _anyListeners?: Array<(...args: any[]) => void>;
 
   /**
@@ -102,7 +143,11 @@ export class Socket extends EventEmitter {
    * @param {Object} auth
    * @package
    */
-  constructor(readonly nsp: Namespace, readonly client: Client, auth: object) {
+  constructor(
+    readonly nsp: Namespace<ListenEvents, EmitEvents, ServerSideEvents>,
+    readonly client: Client<ListenEvents, EmitEvents, ServerSideEvents>,
+    auth: object
+  ) {
     super();
     this.server = nsp.server;
     this.adapter = this.nsp.adapter;
@@ -143,69 +188,65 @@ export class Socket extends EventEmitter {
    * @return Always returns `true`.
    * @public
    */
-  public emit(ev: string, ...args: any[]): boolean {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
     if (RESERVED_EVENTS.has(ev)) {
       throw new Error(`"${ev}" is a reserved event name`);
     }
-    args.unshift(ev);
+    const data: any[] = [ev, ...args];
     const packet: any = {
       type: PacketType.EVENT,
-      data: args,
+      data: data,
     };
 
     // access last argument to see if it's an ACK callback
-    if (typeof args[args.length - 1] === "function") {
-      if (this._rooms.size || this.flags.broadcast) {
-        throw new Error("Callbacks are not supported when broadcasting");
-      }
-
+    if (typeof data[data.length - 1] === "function") {
       debug("emitting packet with ack id %d", this.nsp._ids);
-      this.acks.set(this.nsp._ids, args.pop());
+      this.acks.set(this.nsp._ids, data.pop());
       packet.id = this.nsp._ids++;
     }
 
-    const rooms = new Set(this._rooms);
     const flags = Object.assign({}, this.flags);
-
-    // reset flags
-    this._rooms.clear();
     this.flags = {};
 
-    if (rooms.size || flags.broadcast) {
-      this.adapter.broadcast(packet, {
-        except: new Set([this.id]),
-        rooms: rooms,
-        flags: flags,
-      });
-    } else {
-      // dispatch packet
-      this.packet(packet, flags);
-    }
+    this.packet(packet, flags);
+
     return true;
   }
 
   /**
    * Targets a room when broadcasting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public to(name: Room): this {
-    this._rooms.add(name);
-    return this;
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.newBroadcastOperator().to(room);
   }
 
   /**
    * Targets a room when broadcasting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public in(name: Room): this {
-    this._rooms.add(name);
-    return this;
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.newBroadcastOperator().in(room);
+  }
+
+  /**
+   * Excludes a room when broadcasting.
+   *
+   * @param room
+   * @return self
+   * @public
+   */
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.newBroadcastOperator().except(room);
   }
 
   /**
@@ -214,7 +255,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -225,7 +266,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -416,9 +457,9 @@ export class Socket extends EventEmitter {
    *
    * @private
    */
-  _onerror(err): void {
+  _onerror(err: Error): void {
     if (this.listeners("error").length) {
-      super.emit("error", err);
+      this.emitReserved("error", err);
     } else {
       console.error("Missing error handler on `socket`.");
       console.error(err.stack);
@@ -436,13 +477,13 @@ export class Socket extends EventEmitter {
   _onclose(reason: string): this | undefined {
     if (!this.connected) return this;
     debug("closing socket - reason %s", reason);
-    super.emit("disconnecting", reason);
+    this.emitReserved("disconnecting", reason);
     this.leaveAll();
     this.nsp._remove(this);
     this.client._remove(this);
     this.connected = false;
     this.disconnected = true;
-    super.emit("disconnect", reason);
+    this.emitReserved("disconnect", reason);
     return;
   }
 
@@ -508,9 +549,8 @@ export class Socket extends EventEmitter {
    * @return {Socket} self
    * @public
    */
-  public get broadcast(): this {
-    this.flags.broadcast = true;
-    return this;
+  public get broadcast(): BroadcastOperator<EmitEvents> {
+    return this.newBroadcastOperator();
   }
 
   /**
@@ -519,9 +559,8 @@ export class Socket extends EventEmitter {
    * @return {Socket} self
    * @public
    */
-  public get local(): this {
-    this.flags.local = true;
-    return this;
+  public get local(): BroadcastOperator<EmitEvents> {
+    return this.newBroadcastOperator().local;
   }
 
   /**
@@ -538,7 +577,7 @@ export class Socket extends EventEmitter {
           return this._onerror(err);
         }
         if (this.connected) {
-          super.emit.apply(this, event);
+          super.emitUntyped.apply(this, event);
         } else {
           debug("ignore packet received after disconnection");
         }
@@ -554,7 +593,7 @@ export class Socket extends EventEmitter {
    * @public
    */
   public use(
-    fn: (event: Array<any>, next: (err: Error) => void) => void
+    fn: (event: Array<any>, next: (err?: Error) => void) => void
   ): this {
     this.fns.push(fn);
     return this;
@@ -674,4 +713,15 @@ export class Socket extends EventEmitter {
   public listenersAny() {
     return this._anyListeners || [];
   }
+
+  private newBroadcastOperator(): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags);
+    this.flags = {};
+    return new BroadcastOperator(
+      this.adapter,
+      new Set<Room>(),
+      new Set<Room>([this.id]),
+      flags
+    );
+  }
 }