chore(release): 3.0.5

Diff: https://github.com/socketio/socket.io/compare/3.0.4...3.0.5

.github/ISSUE_TEMPLATE.md

@@ -1,32 +0,0 @@
-
-**Note**: for support questions, please use one of these channels: [stackoverflow](http://stackoverflow.com/questions/tagged/socket.io) or [slack](https://socketio.slack.com)
-
-For bug reports and feature requests for the **Swift client**, please open an issue [there](https://github.com/socketio/socket.io-client-swift).
-
-For bug reports and feature requests for the **Java client**, please open an issue [there](https://github.com/socketio/socket.io-client-java).
-
-### You want to:
-
-* [x] report a *bug*
-* [ ] request a *feature*
-
-### Current behaviour
-
-*What is actually happening?*
-
-### Steps to reproduce (if the current behaviour is a bug)
-
-**Note**: the best way (and by that we mean **the only way**) to get a quick answer is to provide a failing test case by forking the following [fiddle](https://github.com/socketio/socket.io-fiddle).
-
-### Expected behaviour
-
-*What is expected?*
-
-### Setup
-- OS:
-- browser:
-- socket.io version:
-
-### Other information (e.g. stacktraces, related issues, suggestions how to fix)
-
-

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,61 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Please fill the following code example:
+
+Socket.IO server version: `x.y.z`
+
+*Server*
+
+```js
+import { Server } from "socket.io";
+
+const io = new Server(3000, {});
+
+io.on("connection", (socket) => {
+  console.log(`connect ${socket.id}`);
+
+  socket.on("disconnect", () => {
+    console.log(`disconnect ${socket.id}`);
+  });
+});
+```
+
+Socket.IO client version: `x.y.z`
+
+*Client*
+
+```js
+import { io } from "socket.io-client";
+
+const socket = io("ws://localhost:3000/", {});
+
+socket.on("connect", () => {
+  console.log(`connect ${socket.id}`);
+});
+
+socket.on("disconnect", () => {
+  console.log("disconnect");
+});
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Platform:**
+ - Device: [e.g. Samsung S8]
+ - OS: [e.g. Android 9.2]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a Question
+    url: https://github.com/socketio/socket.io/discussions/new?category=q-a
+    about: Ask the community for help

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

@@ -7,10 +7,10 @@
 * [ ] a code change that improves performance
 * [ ] other
 
-### Current behaviour
+### Current behavior
 
 
-### New behaviour
+### New behavior
 
 
 ### Other information (e.g. related issues)

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  test-node:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm test
+        env:
+          CI: true

.travis.yml

@@ -1,10 +0,0 @@
-language: node_js
-sudo: false
-node_js:
-  - '10'
-  - '12'
-  - '14'
-notifications:
-  irc: "irc.freenode.org#socket.io"
-git:
-  depth: 1

CHANGELOG.md

@@ -1,3 +1,39 @@
+## [3.0.5](https://github.com/socketio/socket.io/compare/3.0.4...3.0.5) (2021-01-05)
+
+
+### Bug Fixes
+
+* properly clear timeout on connection failure ([170b739](https://github.com/socketio/socket.io/commit/170b739f147cb6c92b423729b877e242e376927d))
+
+
+### Reverts
+
+* restore the socket middleware functionality ([bf54327](https://github.com/socketio/socket.io/commit/bf5432742158e4d5ba2722cff4a614967dffa5b9))
+
+
+## [3.0.4](https://github.com/socketio/socket.io/compare/3.0.3...3.0.4) (2020-12-07)
+
+
+## [3.0.3](https://github.com/socketio/socket.io/compare/3.0.2...3.0.3) (2020-11-19)
+
+
+## [3.0.2](https://github.com/socketio/socket.io/compare/3.0.1...3.0.2) (2020-11-17)
+
+
+### Bug Fixes
+
+* merge Engine.IO options ([43705d7](https://github.com/socketio/socket.io/commit/43705d7a9149833afc69edc937ea7f8c9aabfeef))
+
+
+## [3.0.1](https://github.com/socketio/socket.io/compare/3.0.0...3.0.1) (2020-11-09)
+
+
+### Bug Fixes
+
+* export ServerOptions and Namespace types ([#3684](https://github.com/socketio/socket.io/issues/3684)) ([f62f180](https://github.com/socketio/socket.io/commit/f62f180edafdd56d8a8a277e092bc66df0c5f07f))
+* **typings:** update the signature of the emit method ([50671d9](https://github.com/socketio/socket.io/commit/50671d984a81535a6a15c704546ca7465e2ea295))
+
+
 # [3.0.0](https://github.com/socketio/socket.io/compare/2.3.0...3.0.0) (2020-11-05)
 
 ### Bug Fixes

Readme.md

@@ -2,7 +2,7 @@
 # socket.io
 
 [![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://secure.travis-ci.org/socketio/socket.io.svg?branch=master)](https://travis-ci.org/socketio/socket.io)
+[![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)
 [![devDependency Status](https://david-dm.org/socketio/socket.io/dev-status.svg)](https://david-dm.org/socketio/socket.io#info=devDependencies)
 [![NPM version](https://badge.fury.io/js/socket.io.svg)](https://www.npmjs.com/package/socket.io)

examples/angular-todomvc/.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/angular-todomvc/.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/angular-todomvc/.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/angular-todomvc/README.md

@@ -0,0 +1,35 @@
+# 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.
+
+## Socket.IO server
+
+Run `npm run start:server` to start the Socket.IO server.
+
+## 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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/package.json

@@ -0,0 +1,48 @@
+{
+  "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",
+    "start:server": "ts-node -O '{\"module\":\"commonjs\"}' server.ts"
+  },
+  "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": "^3.0.4",
+    "socket.io-client": "^3.0.4",
+    "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/angular-todomvc/server.ts

@@ -0,0 +1,28 @@
+import { Server, Socket } from "socket.io";
+
+const io = new Server(8080, {
+  cors: {
+    origin: "http://localhost:4200",
+    methods: ["GET", "POST"]
+  }
+});
+
+interface Todo {
+  completed: boolean;
+  editing: boolean;
+  title: string;
+}
+
+let todos: Array<Todo> = [];
+
+io.on("connect", (socket: Socket) => {
+    socket.emit("todos", todos);
+
+    // note: we could also create a CRUD (create/read/update/delete) service for the todo list
+    socket.on("update-store", (updatedTodos) => {
+      // store it locally
+      todos = updatedTodos;
+      // broadcast to everyone but the sender
+      socket.broadcast.emit("todos", todos);
+    });
+});

examples/angular-todomvc/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/angular-todomvc/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/angular-todomvc/src/app/app.component.ts

@@ -0,0 +1,59 @@
+import { Component } from '@angular/core';
+import { RemoteTodoStore, Todo } from './store';
+
+@Component({
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+  styleUrls: ['./app.component.css']
+})
+export class AppComponent {
+  todoStore: RemoteTodoStore;
+  newTodoText = '';
+
+  constructor(todoStore: RemoteTodoStore) {
+    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/angular-todomvc/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 { RemoteTodoStore } from './store';
+import { FormsModule } from "@angular/forms";
+
+@NgModule({
+  declarations: [
+    AppComponent
+  ],
+  imports: [
+    BrowserModule,
+    FormsModule
+  ],
+  providers: [RemoteTodoStore],
+  bootstrap: [AppComponent]
+})
+export class AppModule { }

examples/angular-todomvc/src/app/store.ts

@@ -0,0 +1,95 @@
+import { io, Socket } from "socket.io-client";
+
+export class Todo {
+  completed: boolean;
+  editing: boolean;
+
+  private _title: String = "";
+  get title() {
+    return this._title;
+  }
+  set title(value: String) {
+    this._title = value.trim();
+  }
+
+  constructor(title: String) {
+    this.completed = false;
+    this.editing = false;
+    this.title = title.trim();
+  }
+}
+
+export class TodoStore {
+  todos: Array<Todo>;
+
+  constructor() {
+    let persistedTodos = JSON.parse(localStorage.getItem('angular2-todos') || '[]');
+    // Normalize back into classes
+    this.todos = persistedTodos.map( (todo: {_title: String, completed: boolean}) => {
+      let ret = new Todo(todo._title);
+      ret.completed = todo.completed;
+      return ret;
+    });
+  }
+
+  protected updateStore() {
+    localStorage.setItem('angular2-todos', JSON.stringify(this.todos));
+  }
+
+  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((t: Todo) => t.completed = completed);
+    this.updateStore();
+  }
+
+  removeCompleted() {
+    this.todos = this.getWithCompleted(false);
+    this.updateStore();
+  }
+
+  getRemaining() {
+    return this.getWithCompleted(false);
+  }
+
+  getCompleted() {
+    return this.getWithCompleted(true);
+  }
+
+  toggleCompletion(todo: Todo) {
+    todo.completed = !todo.completed;
+    this.updateStore();
+  }
+
+  remove(todo: Todo) {
+    this.todos.splice(this.todos.indexOf(todo), 1);
+    this.updateStore();
+  }
+
+  add(title: String) {
+    this.todos.push(new Todo(title));
+    this.updateStore();
+  }
+}
+
+export class RemoteTodoStore extends TodoStore {
+  private socket: Socket;
+
+  constructor() {
+    super();
+    this.socket = io("http://localhost:8080");
+    this.socket.on("todos", (updatedTodos: Array<Todo>) => {
+      this.todos = updatedTodos;
+    });
+  }
+
+  protected updateStore() {
+    this.socket.emit("update-store", this.todos.map(({ title, editing, completed }) => ({ title, editing, completed })));
+  }
+}

examples/angular-todomvc/src/environments/environment.prod.ts

@@ -0,0 +1,3 @@
+export const environment = {
+  production: true
+};

examples/angular-todomvc/src/environments/environment.ts

@@ -0,0 +1,16 @@
+// 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
+};
+
+/*
+ * 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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/angular-todomvc/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/chat/README.md

@@ -1,7 +1,7 @@
 
 # Socket.IO Chat
 
-A simple chat demo for socket.io
+A simple chat demo for Socket.IO
 
 ## How to use
 

examples/chat/index.js

@@ -1,10 +1,10 @@
 // Setup basic express server
-var express = require('express');
-var app = express();
-var path = require('path');
-var server = require('http').createServer(app);
-var io = require('socket.io')(server);
-var port = process.env.PORT || 3000;
+const express = require('express');
+const app = express();
+const path = require('path');
+const server = require('http').createServer(app);
+const io = require('socket.io')(server);
+const port = process.env.PORT || 3000;
 
 server.listen(port, () => {
   console.log('Server listening at port %d', port);
@@ -15,10 +15,10 @@ app.use(express.static(path.join(__dirname, 'public')));
 
 // Chatroom
 
-var numUsers = 0;
+let numUsers = 0;
 
 io.on('connection', (socket) => {
-  var addedUser = false;
+  let addedUser = false;
 
   // when the client emits 'new message', this listens and executes
   socket.on('new message', (data) => {

examples/chat/package-lock.json

@@ -13,54 +13,16 @@
         "negotiator": "0.6.2"
       }
     },
-    "after": {
-      "version": "0.8.2",
-      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
-      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8="
-    },
     "array-flatten": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
     },
-    "arraybuffer.slice": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
-      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog=="
-    },
-    "async-limiter": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
-      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ=="
-    },
-    "backo2": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
-      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
-    },
-    "base64-arraybuffer": {
-      "version": "0.1.5",
-      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.5.tgz",
-      "integrity": "sha1-c5JncZI7Whl0etZmqlzUv5xunOg="
-    },
     "base64id": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
       "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
     },
-    "better-assert": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/better-assert/-/better-assert-1.0.2.tgz",
-      "integrity": "sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=",
-      "requires": {
-        "callsite": "1.0.0"
-      }
-    },
-    "blob": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz",
-      "integrity": "sha512-gaqbzQPqOoamawKg0LGVd7SzLgXS+JH61oWprSLH+P+abTczqJbhTR8CmJ2u9/bUYNmHTGJx/UEmn6doAvvuig=="
-    },
     "body-parser": {
       "version": "1.19.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
@@ -83,25 +45,10 @@
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
       "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
     },
-    "callsite": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/callsite/-/callsite-1.0.0.tgz",
-      "integrity": "sha1-KAOY5dZkvXQDi28JBRU+borxvCA="
-    },
-    "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": "1.2.1",
-      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
-      "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY="
-    },
-    "component-inherit": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/component-inherit/-/component-inherit-0.0.3.tgz",
-      "integrity": "sha1-ZF/ErfWLcrZJ1crmUTVhnbJv8UM="
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
     },
     "content-disposition": {
       "version": "0.5.3",
@@ -126,6 +73,15 @@
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
     },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
+    },
     "debug": {
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -155,22 +111,23 @@
       "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
     },
     "engine.io": {
-      "version": "3.4.1",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-3.4.1.tgz",
-      "integrity": "sha512-8MfIfF1/IIfxuc2gv5K+XlFZczw/BpTvqBdl0E2fBLkYQp4miv4LuDTVtYt4yMyaIFLEr4vtaSgV4mjvll8Crw==",
+      "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": "0.3.1",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
         "debug": "~4.1.0",
-        "engine.io-parser": "~2.2.0",
+        "engine.io-parser": "~4.0.0",
         "ws": "^7.1.2"
       },
       "dependencies": {
         "cookie": {
-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-          "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
+          "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA=="
         },
         "debug": {
           "version": "4.1.1",
@@ -187,58 +144,10 @@
         }
       }
     },
-    "engine.io-client": {
-      "version": "3.4.1",
-      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-3.4.1.tgz",
-      "integrity": "sha512-RJNmA+A9Js+8Aoq815xpGAsgWH1VoSYM//2VgIiu9lNOaHFfLpTjH4tOzktBpjIs5lvOfiNY1dwf+NuU6D38Mw==",
-      "requires": {
-        "component-emitter": "1.2.1",
-        "component-inherit": "0.0.3",
-        "debug": "~4.1.0",
-        "engine.io-parser": "~2.2.0",
-        "has-cors": "1.1.0",
-        "indexof": "0.0.1",
-        "parseqs": "0.0.5",
-        "parseuri": "0.0.5",
-        "ws": "~6.1.0",
-        "xmlhttprequest-ssl": "~1.5.4",
-        "yeast": "0.1.2"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "4.1.1",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
-          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
-          "requires": {
-            "ms": "^2.1.1"
-          }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
-        },
-        "ws": {
-          "version": "6.1.4",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.4.tgz",
-          "integrity": "sha512-eqZfL+NE/YQc1/ZynhojeV8q+H050oR8AZ2uIev7RU10svA9ZnJUddHcOUZTJLinZ9yEfdA2kSATS2qZK5fhJA==",
-          "requires": {
-            "async-limiter": "~1.0.0"
-          }
-        }
-      }
-    },
     "engine.io-parser": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-2.2.0.tgz",
-      "integrity": "sha512-6I3qD9iUxotsC5HEMuuGsKA0cXerGz+4uGcXQEkfBidgKf0amsjrrtwcbwK/nzpZBxclXlV7gGl9dgWvu4LF6w==",
-      "requires": {
-        "after": "0.8.2",
-        "arraybuffer.slice": "~0.0.7",
-        "base64-arraybuffer": "0.1.5",
-        "blob": "0.0.5",
-        "has-binary2": "~1.0.2"
-      }
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.1.tgz",
+      "integrity": "sha512-v5aZK1hlckcJDGmHz3W8xvI3NUHYc9t8QtTbqdR5OaH3S9iJZilPubauOm+vLWOMMWzpE3hiq92l9lTAHamRCg=="
     },
     "escape-html": {
       "version": "1.0.3",
@@ -311,19 +220,6 @@
       "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
       "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
     },
-    "has-binary2": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/has-binary2/-/has-binary2-1.0.3.tgz",
-      "integrity": "sha512-G1LWKhDSvhGeAQ8mPVQlqNcOB2sJdwATtZKl2pDKKHfpf/rYj24lkinxf69blJbnsvtqqNU+L3SL50vzZhXOnw==",
-      "requires": {
-        "isarray": "2.0.1"
-      }
-    },
-    "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="
-    },
     "http-errors": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
@@ -344,11 +240,6 @@
         "safer-buffer": ">= 2.1.2 < 3"
       }
     },
-    "indexof": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/indexof/-/indexof-0.0.1.tgz",
-      "integrity": "sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10="
-    },
     "inherits": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
@@ -359,11 +250,6 @@
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
       "integrity": "sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g=="
     },
-    "isarray": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.1.tgz",
-      "integrity": "sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4="
-    },
     "media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -407,10 +293,10 @@
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
       "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw=="
     },
-    "object-component": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/object-component/-/object-component-0.0.3.tgz",
-      "integrity": "sha1-8MaapQ78lbhmwYb0AKM3acsvEpE="
+    "object-assign": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
     },
     "on-finished": {
       "version": "2.3.0",
@@ -420,22 +306,6 @@
         "ee-first": "1.1.1"
       }
     },
-    "parseqs": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.5.tgz",
-      "integrity": "sha1-1SCKNzjkZ2bikbouoXNoSSGouJ0=",
-      "requires": {
-        "better-assert": "~1.0.0"
-      }
-    },
-    "parseuri": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.5.tgz",
-      "integrity": "sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=",
-      "requires": {
-        "better-assert": "~1.0.0"
-      }
-    },
     "parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -530,16 +400,16 @@
       "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
     },
     "socket.io": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-2.3.0.tgz",
-      "integrity": "sha512-2A892lrj0GcgR/9Qk81EaY2gYhCBxurV0PfmmESO6p27QPrUK1J3zdns+5QPqvUYK2q657nSj0guoIil9+7eFg==",
+      "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": "~3.4.0",
-        "has-binary2": "~1.0.2",
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-        "socket.io-parser": "~3.4.0"
+        "engine.io": "~4.0.0",
+        "socket.io-adapter": "~2.0.3",
+        "socket.io-parser": "~4.0.1"
       },
       "dependencies": {
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@@ -558,79 +428,17 @@
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-              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
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+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.0.3.tgz",
+      "integrity": "sha512-2wo4EXgxOGSFueqvHAdnmi5JLZzWqMArjuP4nqC26AtLh5PoCPsaRbRdah2xhcwTAMooZfjYiNVNkkmmSMaxOQ=="
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+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
+      "integrity": "sha512-5JfNykYptCwU2lkOI0ieoePWm+6stEhkZ2UnLDjqnE1YEjUlXXLd1lpxPZ+g+h3rtaytwWkWrLQCaJULlGqjOg==",
       "requires": {
-        "component-emitter": "1.2.1",
-        "debug": "~4.1.0",
-        "isarray": "2.0.1"
+        "component-emitter": "~1.3.0",
+        "debug": "~4.1.0"
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         "debug": {
@@ -653,11 +461,6 @@
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
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-    "to-array": {
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-      "integrity": "sha1-F+bBH3PdTz10zaek/zI46a2b+JA="
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@@ -688,19 +491,9 @@
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-      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
-      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
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     }
   }
 }

examples/chat/package.json

@@ -8,7 +8,7 @@
   "license": "BSD",
   "dependencies": {
     "express": "~4.17.1",
-    "socket.io": "~2.3.0"
+    "socket.io": "^3.0.0"
   },
   "scripts": {
     "start": "node index.js"

examples/es-modules/package-lock.json

@@ -33,19 +33,6 @@
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@@ -79,9 +66,9 @@
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+      "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==",
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@@ -93,9 +80,9 @@
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-      "integrity": "sha512-dmydBrbZW0AYX4+u7aRzslPw/MSZy3HwwqHx3Es5OPj9q0tnyPeFZZU/UE5aLjba6xIwZTXkB+OdqF5wmR21IA==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-4.0.1.tgz",
+      "integrity": "sha512-3XXfWrEutlf1vg5PlS805bD+AgZXhRIKYAG04f1iCGOs70dWEYlZGfCZUNwPwNx05lBCKs1lIeL3SkLB0P++xw==",
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@@ -103,20 +90,12 @@
         "engine.io-parser": "~4.0.1",
         "has-cors": "1.1.0",
         "parseqs": "0.0.6",
-        "parseuri": "0.0.5",
+        "parseuri": "0.0.6",
         "ws": "~7.2.1",
         "xmlhttprequest-ssl": "~1.5.4",
         "yeast": "0.1.2"
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       "dependencies": {
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-          "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.5.tgz",
-          "integrity": "sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=",
-          "requires": {
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-          }
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           "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.5.tgz",
@@ -173,27 +152,27 @@
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     "socket.io": {
-      "version": "3.0.0-rc2",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-3.0.0-rc2.tgz",
-      "integrity": "sha512-viH824jjAF+tCN6zfFgZR9wsgXWZ6zuVZ46ZQDsThyXdkv6+RihAZ/xz6LqsP8vFK83MVtRztMAIc56eyeKX0g==",
+      "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-rc1",
-        "socket.io-client": "3.0.0-rc2",
-        "socket.io-parser": "4.0.1-rc2"
+        "socket.io-adapter": "~2.0.3",
+        "socket.io-parser": "~4.0.1"
       }
     },
     "socket.io-adapter": {
-      "version": "2.0.3-rc1",
-      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.0.3-rc1.tgz",
-      "integrity": "sha512-/+irxVkiriDRMt2hcYYlDOl2LUU3wkjPQ1917t/hb617/W+bnlDaqEGqtQpFE/tWys5FI1+q2JnjdwNeRHxyNw=="
+      "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": "3.0.0-rc2",
-      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.0-rc2.tgz",
-      "integrity": "sha512-ZIVzV1ANogp5ZqkIn504UhD4NwZkCWLoq9/rHiNSI0RIsvsfGxyOzhNvr0fWPppfr8+hNt5Qbij6ucV5ijIJDg==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.0.tgz",
+      "integrity": "sha512-NreA86JJSMMSyPomkpyWL+FeKB3wmsWbGbNvtoxPbodV7dEIWxwyOklYfhuTpJJDCpEFd55vET2/ZyYwJ66Bfg==",
       "requires": {
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         "backo2": "1.0.2",
@@ -202,13 +181,13 @@
         "debug": "~4.1.0",
         "engine.io-client": "~4.0.0",
         "parseuri": "0.0.6",
-        "socket.io-parser": "4.0.1-rc2"
+        "socket.io-parser": "~4.0.1"
       }
     },
     "socket.io-parser": {
-      "version": "4.0.1-rc2",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1-rc2.tgz",
-      "integrity": "sha512-aI20UWITf5vKgwA1HjCanYlM8cr2VDmOBiM3+1MM1MautnHAngiceuN0gUOtQs4MmWatuD2Td8g00EwHf3qthQ==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
+      "integrity": "sha512-5JfNykYptCwU2lkOI0ieoePWm+6stEhkZ2UnLDjqnE1YEjUlXXLd1lpxPZ+g+h3rtaytwWkWrLQCaJULlGqjOg==",
       "requires": {
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         "debug": "~4.1.0"
@@ -220,9 +199,9 @@
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
     },
     "ws": {
-      "version": "7.3.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.1.tgz",
-      "integrity": "sha512-D3RuNkynyHmEJIpD2qrgVkc9DQ23OrN/moAwZX4L8DfvszsJxpjQuUq3LMx6HoYji9fbIOBY18XWBsAux1ZZUA=="
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
+      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
     },
     "xmlhttprequest-ssl": {
       "version": "1.5.5",

examples/es-modules/package.json

@@ -9,7 +9,7 @@
     "node": ">=12.17.0"
   },
   "dependencies": {
-    "socket.io": "beta",
-    "socket.io-client": "beta"
+    "socket.io": "^3.0.0",
+    "socket.io-client": "^3.0.0"
   }
 }

examples/react-native/README.md

@@ -14,3 +14,7 @@ $ npm ci
 $ npm start # run expo
 $ node server.js # run the server
 ```
+
+You will probably need to update the IP address of your server in the `App.js` file:
+
+![IP address](assets/server-ip.png)

examples/react-native/package-lock.json

@@ -1236,6 +1236,11 @@
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ=="
     },
+    "@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=="
+    },
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       "version": "2.0.32",
       "resolved": "https://registry.npmjs.org/@types/fbemitter/-/fbemitter-2.0.32.tgz",
@@ -1349,11 +1354,6 @@
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@@ -1486,11 +1486,6 @@
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       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg="
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-      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
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       "resolved": "https://registry.npmjs.org/art/-/art-0.10.3.tgz",
@@ -1671,9 +1666,9 @@
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-      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.5.tgz",
-      "integrity": "sha1-c5JncZI7Whl0etZmqlzUv5xunOg="
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.4.tgz",
+      "integrity": "sha1-mBjHngWbE1X5fgQooBfIOOkLqBI="
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@@ -1693,14 +1688,6 @@
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-      "integrity": "sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=",
-      "requires": {
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       "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.48.tgz",
@@ -1715,11 +1702,6 @@
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     "blueimp-md5": {
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@@ -1862,11 +1844,6 @@
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-      "resolved": "https://registry.npmjs.org/callsite/-/callsite-1.0.0.tgz",
-      "integrity": "sha1-KAOY5dZkvXQDi28JBRU+borxvCA="
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@@ -2072,11 +2049,6 @@
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       "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
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-    "component-inherit": {
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-      "resolved": "https://registry.npmjs.org/component-inherit/-/component-inherit-0.0.3.tgz",
-      "integrity": "sha1-ZF/ErfWLcrZJ1crmUTVhnbJv8UM="
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       "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.18.tgz",
@@ -2165,9 +2137,9 @@
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-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-      "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
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@@ -2200,6 +2172,15 @@
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       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
+    "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"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.1.tgz",
@@ -2409,64 +2390,54 @@
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-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-3.4.2.tgz",
-      "integrity": "sha512-b4Q85dFkGw+TqgytGPrGgACRUhsdKc9S9ErRAXpPGy/CXKs4tYoHDkvIRdsseAF7NjfVwjRFIn6KTnbw7LwJZg==",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-4.0.2.tgz",
+      "integrity": "sha512-sumdttqWLNjbuSMOSgDdL2xiEld9s5QZDk9VLyr4e28o+lzNNADhU3qpQDAY7cm2VZH0Otw/U0fL8mEjZ6kBMg==",
       "requires": {
         "accepts": "~1.3.4",
         "base64id": "2.0.0",
-        "cookie": "0.3.1",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
         "debug": "~4.1.0",
-        "engine.io-parser": "~2.2.0",
+        "engine.io-parser": "~4.0.0",
         "ws": "^7.1.2"
       },
       "dependencies": {
         "ws": {
-          "version": "7.3.0",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.0.tgz",
-          "integrity": "sha512-iFtXzngZVXPGgpTlP1rBqsUK82p9tKqsWRPg5L56egiljujJT3vGAYnHANvFxBieXrTFavhzhxW52jnaWV+w2w=="
+          "version": "7.4.0",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
+          "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
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-      "version": "3.4.3",
-      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-3.4.3.tgz",
-      "integrity": "sha512-0NGY+9hioejTEJCaSJZfWZLk4FPI9dN+1H1C4+wj2iuFba47UgZbJzfWs4aNFajnX/qAaYKbe2lLTfEEWzCmcw==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-4.0.3.tgz",
+      "integrity": "sha512-2U6dZkOrMGpVh11l+4pMXHMDnirnzIPIYfugEUpnAl0/3wBb+GO7euu0TT3Nn8E5hgaWSpUA+XOfrch2uZdyGA==",
       "requires": {
+        "base64-arraybuffer": "0.1.4",
         "component-emitter": "~1.3.0",
-        "component-inherit": "0.0.3",
         "debug": "~4.1.0",
-        "engine.io-parser": "~2.2.0",
+        "engine.io-parser": "~4.0.1",
         "has-cors": "1.1.0",
-        "indexof": "0.0.1",
-        "parseqs": "0.0.5",
-        "parseuri": "0.0.5",
-        "ws": "~6.1.0",
+        "parseqs": "0.0.6",
+        "parseuri": "0.0.6",
+        "ws": "~7.2.1",
         "xmlhttprequest-ssl": "~1.5.4",
         "yeast": "0.1.2"
       },
       "dependencies": {
         "ws": {
-          "version": "6.1.4",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.4.tgz",
-          "integrity": "sha512-eqZfL+NE/YQc1/ZynhojeV8q+H050oR8AZ2uIev7RU10svA9ZnJUddHcOUZTJLinZ9yEfdA2kSATS2qZK5fhJA==",
-          "requires": {
-            "async-limiter": "~1.0.0"
-          }
+          "version": "7.2.5",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.5.tgz",
+          "integrity": "sha512-C34cIU4+DB2vMyAbmEKossWq2ZQDr6QEyuuCzWrM9zfw1sGc0mYiJ0UnG9zzNykt49C2Fi34hvr2vssFQRS6EA=="
         }
       }
     },
     "engine.io-parser": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-2.2.0.tgz",
-      "integrity": "sha512-6I3qD9iUxotsC5HEMuuGsKA0cXerGz+4uGcXQEkfBidgKf0amsjrrtwcbwK/nzpZBxclXlV7gGl9dgWvu4LF6w==",
-      "requires": {
-        "after": "0.8.2",
-        "arraybuffer.slice": "~0.0.7",
-        "base64-arraybuffer": "0.1.5",
-        "blob": "0.0.5",
-        "has-binary2": "~1.0.2"
-      }
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.1.tgz",
+      "integrity": "sha512-v5aZK1hlckcJDGmHz3W8xvI3NUHYc9t8QtTbqdR5OaH3S9iJZilPubauOm+vLWOMMWzpE3hiq92l9lTAHamRCg=="
     },
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       "version": "7.5.1",
@@ -3118,21 +3089,6 @@
       "resolved": "https://registry.npmjs.org/growly/-/growly-1.3.0.tgz",
       "integrity": "sha1-8QdIy+dq+WS3yWyTxrzCivEgwIE="
     },
-    "has-binary2": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/has-binary2/-/has-binary2-1.0.3.tgz",
-      "integrity": "sha512-G1LWKhDSvhGeAQ8mPVQlqNcOB2sJdwATtZKl2pDKKHfpf/rYj24lkinxf69blJbnsvtqqNU+L3SL50vzZhXOnw==",
-      "requires": {
-        "isarray": "2.0.1"
-      },
-      "dependencies": {
-        "isarray": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.1.tgz",
-          "integrity": "sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4="
-        }
-      }
-    },
     "has-cors": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/has-cors/-/has-cors-1.1.0.tgz",
@@ -3236,11 +3192,6 @@
       "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
       "integrity": "sha1-khi5srkoojixPcT7a21XbyMUU+o="
     },
-    "indexof": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/indexof/-/indexof-0.0.1.tgz",
-      "integrity": "sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10="
-    },
     "inflight": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
@@ -4546,11 +4497,6 @@
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
       "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
     },
-    "object-component": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/object-component/-/object-component-0.0.3.tgz",
-      "integrity": "sha1-8MaapQ78lbhmwYb0AKM3acsvEpE="
-    },
     "object-copy": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/object-copy/-/object-copy-0.1.0.tgz",
@@ -4763,20 +4709,14 @@
       "integrity": "sha512-3YHlOa/JgH6Mnpr05jP9eDG254US9ek25LyIxZlDItp2iJtwyaXQb57lBYLdT3MowkUFYEV2XXNAYIPlESvJlA=="
     },
     "parseqs": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.5.tgz",
-      "integrity": "sha1-1SCKNzjkZ2bikbouoXNoSSGouJ0=",
-      "requires": {
-        "better-assert": "~1.0.0"
-      }
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.6.tgz",
+      "integrity": "sha512-jeAGzMDbfSHHA091hr0r31eYfTig+29g3GKKE/PPbEQ65X0lmMwlEoqmhzu0iztID5uJpZsFlUPDP8ThPL7M8w=="
     },
     "parseuri": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.5.tgz",
-      "integrity": "sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=",
-      "requires": {
-        "better-assert": "~1.0.0"
-      }
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.6.tgz",
+      "integrity": "sha512-AUjen8sAkGgao7UyCX6Ahv0gIK2fABKmYjvP4xmy5JaKvcbTRueIqIPHLAfq30xJddqSE033IOMUSOMCcK3Sow=="
     },
     "parseurl": {
       "version": "1.3.3",
@@ -5925,101 +5865,45 @@
       }
     },
     "socket.io": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-2.3.0.tgz",
-      "integrity": "sha512-2A892lrj0GcgR/9Qk81EaY2gYhCBxurV0PfmmESO6p27QPrUK1J3zdns+5QPqvUYK2q657nSj0guoIil9+7eFg==",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-3.0.1.tgz",
+      "integrity": "sha512-oVYbCQ4sCwm4wVi+f1bsE3YFXcvd6b4JjVP8D7IZnQqBeJOKX9XrdgJWSbXqBEqUXPY3jdTqb1M3s4KFTa/IHg==",
       "requires": {
+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
         "debug": "~4.1.0",
-        "engine.io": "~3.4.0",
-        "has-binary2": "~1.0.2",
-        "socket.io-adapter": "~1.1.0",
-        "socket.io-client": "2.3.0",
-        "socket.io-parser": "~3.4.0"
+        "engine.io": "~4.0.0",
+        "socket.io-adapter": "~2.0.3",
+        "socket.io-parser": "~4.0.1"
       }
     },
     "socket.io-adapter": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-1.1.2.tgz",
-      "integrity": "sha512-WzZRUj1kUjrTIrUKpZLEzFZ1OLj5FwLlAFQs9kuZJzJi5DKdU7FsWc36SNmA8iDOtwBQyT8FkrriRM8vXLYz8g=="
+      "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": "2.3.0",
-      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-2.3.0.tgz",
-      "integrity": "sha512-cEQQf24gET3rfhxZ2jJ5xzAOo/xhZwK+mOqtGRg5IowZsMgwvHwnf/mCRapAAkadhM26y+iydgwsXGObBB5ZdA==",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.1.tgz",
+      "integrity": "sha512-iIzWRDrF/h3KPtHjvLt5LL/1n7Euvv35zVa1r10ScRjVw40yc8DxFj7GnKrj1RNYkbtveWOwEsy2lWp3oFJO7w==",
       "requires": {
+        "@types/component-emitter": "^1.2.10",
         "backo2": "1.0.2",
-        "base64-arraybuffer": "0.1.5",
         "component-bind": "1.0.0",
-        "component-emitter": "1.2.1",
+        "component-emitter": "~1.3.0",
         "debug": "~4.1.0",
-        "engine.io-client": "~3.4.0",
-        "has-binary2": "~1.0.2",
-        "has-cors": "1.1.0",
-        "indexof": "0.0.1",
-        "object-component": "0.0.3",
-        "parseqs": "0.0.5",
-        "parseuri": "0.0.5",
-        "socket.io-parser": "~3.3.0",
-        "to-array": "0.1.4"
-      },
-      "dependencies": {
-        "component-emitter": {
-          "version": "1.2.1",
-          "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
-          "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY="
-        },
-        "isarray": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.1.tgz",
-          "integrity": "sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4="
-        },
-        "ms": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
-        },
-        "socket.io-parser": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.3.0.tgz",
-          "integrity": "sha512-hczmV6bDgdaEbVqhAeVMM/jfUfzuEZHsQg6eOmLgJht6G3mPKMxYm75w2+qhAQZ+4X+1+ATZ+QFKeOZD5riHng==",
-          "requires": {
-            "component-emitter": "1.2.1",
-            "debug": "~3.1.0",
-            "isarray": "2.0.1"
-          },
-          "dependencies": {
-            "debug": {
-              "version": "3.1.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-              "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
-              "requires": {
-                "ms": "2.0.0"
-              }
-            }
-          }
-        }
+        "engine.io-client": "~4.0.0",
+        "parseuri": "0.0.6",
+        "socket.io-parser": "~4.0.1"
       }
     },
     "socket.io-parser": {
-      "version": "3.4.1",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.4.1.tgz",
-      "integrity": "sha512-11hMgzL+WCLWf1uFtHSNvliI++tcRUWdoeYuwIl+Axvwy9z2gQM+7nJyN3STj1tLj5JyIUH8/gpDGxzAlDdi0A==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
+      "integrity": "sha512-5JfNykYptCwU2lkOI0ieoePWm+6stEhkZ2UnLDjqnE1YEjUlXXLd1lpxPZ+g+h3rtaytwWkWrLQCaJULlGqjOg==",
       "requires": {
-        "component-emitter": "1.2.1",
-        "debug": "~4.1.0",
-        "isarray": "2.0.1"
-      },
-      "dependencies": {
-        "component-emitter": {
-          "version": "1.2.1",
-          "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
-          "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY="
-        },
-        "isarray": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.1.tgz",
-          "integrity": "sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4="
-        }
+        "component-emitter": "~1.3.0",
+        "debug": "~4.1.0"
       }
     },
     "sort-keys": {
@@ -6284,11 +6168,6 @@
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
       "integrity": "sha1-I2QN17QtAEM5ERQIIOXPRA5SHdE="
     },
-    "to-array": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/to-array/-/to-array-0.1.4.tgz",
-      "integrity": "sha1-F+bBH3PdTz10zaek/zI46a2b+JA="
-    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",

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": "~2.3.0",
-    "socket.io-client": "~2.3.0"
+    "socket.io": "^3.0.1",
+    "socket.io-client": "^3.0.1"
   },
   "devDependencies": {
     "babel-preset-expo": "~8.1.0",

examples/react-native/server.js

@@ -8,7 +8,11 @@ io.on('connection', socket => {
   });
 });
 
-io.listen(3000);
+io.listen(3000, {
+  cors: {
+    origin: ["http://localhost:19006"]
+  }
+});
 
 setInterval(() => {
   io.emit('message', new Date().toISOString());

examples/typescript/client.ts

@@ -1,7 +1,6 @@
-import { Manager } from "socket.io-client";
+import { io } from "socket.io-client";
 
-const manager = new Manager("ws://localhost:8080");
-const socket = manager.socket("/");
+const socket = io("ws://localhost:8080/", {});
 
 socket.on("connect", () => {
     console.log(`connect ${socket.id}`);

examples/typescript/package-lock.json

@@ -1,5 +1,5 @@
 {
-  "name": "typescript",
+  "name": "typescript-example",
   "version": "1.0.0",
   "lockfileVersion": 1,
   "requires": true,
@@ -9,6 +9,21 @@
       "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",
@@ -81,9 +96,9 @@
       "integrity": "sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A=="
     },
     "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==",
+      "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": {
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@@ -172,27 +190,30 @@
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+        "@types/cors": "^2.8.8",
+        "@types/node": "^14.14.7",
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         "debug": "~4.1.0",
         "engine.io": "~4.0.0",
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-        "socket.io-parser": "4.0.1-rc3"
+        "socket.io-adapter": "~2.0.3",
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+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-3.0.4.tgz",
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@@ -201,14 +222,15 @@
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         "engine.io-client": "~4.0.0",
         "parseuri": "0.0.6",
-        "socket.io-parser": "4.0.1-rc3"
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         "debug": "~4.1.0"
       }
@@ -239,15 +261,20 @@
         "yn": "3.1.1"
       }
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+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.5.tgz",
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examples/typescript/package.json

@@ -1,17 +1,19 @@
 {
-  "name": "typescript",
+  "name": "typescript-example",
   "version": "1.0.0",
   "description": "An example with TypeScript",
   "private": true,
   "scripts": {
+    "build": "tsc",
     "start:server": "ts-node server.ts",
     "start:client": "ts-node client.ts"
   },
   "author": "Damien Arrachequesne",
   "license": "MIT",
   "dependencies": {
-    "socket.io": "beta",
-    "socket.io-client": "beta",
-    "ts-node": "^9.0.0"
+    "socket.io": "^3.0.4",
+    "socket.io-client": "^3.0.4",
+    "ts-node": "^9.0.0",
+    "typescript": "^4.0.5"
   }
 }

examples/typescript/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5"
+  },
+  "exclude": [
+    "node_modules"
+  ]
+}

examples/whiteboard/README.md

@@ -1,7 +1,7 @@
 
 # Socket.IO Collaborative Whiteboard
 
-A simple collaborative whiteboard for socket.io
+A simple collaborative whiteboard for Socket.IO
 
 ## How to use
 

examples/whiteboard/package-lock.json

@@ -13,54 +13,16 @@
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-      "integrity": "sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=",
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-      "integrity": "sha1-ZF/ErfWLcrZJ1crmUTVhnbJv8UM="
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@@ -126,6 +73,15 @@
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       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
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+    "cors": {
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+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
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+      "requires": {
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+        "vary": "^1"
+      }
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@@ -155,22 +111,23 @@
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       "requires": {
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         "base64id": "2.0.0",
-        "cookie": "0.3.1",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
         "debug": "~4.1.0",
-        "engine.io-parser": "~2.2.0",
+        "engine.io-parser": "~4.0.0",
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-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-          "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
+          "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA=="
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@@ -187,58 +144,10 @@
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-        "base64-arraybuffer": "0.1.5",
-        "blob": "0.0.5",
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+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.1.tgz",
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@@ -311,19 +220,6 @@
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@@ -344,11 +240,6 @@
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     "inherits": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
@@ -359,11 +250,6 @@
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
       "integrity": "sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g=="
     },
-    "isarray": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.1.tgz",
-      "integrity": "sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4="
-    },
     "media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -407,10 +293,10 @@
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
       "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw=="
     },
-    "object-component": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/object-component/-/object-component-0.0.3.tgz",
-      "integrity": "sha1-8MaapQ78lbhmwYb0AKM3acsvEpE="
+    "object-assign": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
     },
     "on-finished": {
       "version": "2.3.0",
@@ -420,22 +306,6 @@
         "ee-first": "1.1.1"
       }
     },
-    "parseqs": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.5.tgz",
-      "integrity": "sha1-1SCKNzjkZ2bikbouoXNoSSGouJ0=",
-      "requires": {
-        "better-assert": "~1.0.0"
-      }
-    },
-    "parseuri": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.5.tgz",
-      "integrity": "sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=",
-      "requires": {
-        "better-assert": "~1.0.0"
-      }
-    },
     "parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -530,16 +400,16 @@
       "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
     },
     "socket.io": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-2.3.0.tgz",
-      "integrity": "sha512-2A892lrj0GcgR/9Qk81EaY2gYhCBxurV0PfmmESO6p27QPrUK1J3zdns+5QPqvUYK2q657nSj0guoIil9+7eFg==",
+      "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": "~3.4.0",
-        "has-binary2": "~1.0.2",
-        "socket.io-adapter": "~1.1.0",
-        "socket.io-client": "2.3.0",
-        "socket.io-parser": "~3.4.0"
+        "engine.io": "~4.0.0",
+        "socket.io-adapter": "~2.0.3",
+        "socket.io-parser": "~4.0.1"
       },
       "dependencies": {
         "debug": {
@@ -558,79 +428,17 @@
       }
     },
     "socket.io-adapter": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-1.1.2.tgz",
-      "integrity": "sha512-WzZRUj1kUjrTIrUKpZLEzFZ1OLj5FwLlAFQs9kuZJzJi5DKdU7FsWc36SNmA8iDOtwBQyT8FkrriRM8vXLYz8g=="
-    },
-    "socket.io-client": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-2.3.0.tgz",
-      "integrity": "sha512-cEQQf24gET3rfhxZ2jJ5xzAOo/xhZwK+mOqtGRg5IowZsMgwvHwnf/mCRapAAkadhM26y+iydgwsXGObBB5ZdA==",
-      "requires": {
-        "backo2": "1.0.2",
-        "base64-arraybuffer": "0.1.5",
-        "component-bind": "1.0.0",
-        "component-emitter": "1.2.1",
-        "debug": "~4.1.0",
-        "engine.io-client": "~3.4.0",
-        "has-binary2": "~1.0.2",
-        "has-cors": "1.1.0",
-        "indexof": "0.0.1",
-        "object-component": "0.0.3",
-        "parseqs": "0.0.5",
-        "parseuri": "0.0.5",
-        "socket.io-parser": "~3.3.0",
-        "to-array": "0.1.4"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "4.1.1",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
-          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
-          "requires": {
-            "ms": "^2.1.1"
-          }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
-        },
-        "socket.io-parser": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.3.0.tgz",
-          "integrity": "sha512-hczmV6bDgdaEbVqhAeVMM/jfUfzuEZHsQg6eOmLgJht6G3mPKMxYm75w2+qhAQZ+4X+1+ATZ+QFKeOZD5riHng==",
-          "requires": {
-            "component-emitter": "1.2.1",
-            "debug": "~3.1.0",
-            "isarray": "2.0.1"
-          },
-          "dependencies": {
-            "debug": {
-              "version": "3.1.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-              "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
-              "requires": {
-                "ms": "2.0.0"
-              }
-            },
-            "ms": {
-              "version": "2.0.0",
-              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
-            }
-          }
-        }
-      }
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.0.3.tgz",
+      "integrity": "sha512-2wo4EXgxOGSFueqvHAdnmi5JLZzWqMArjuP4nqC26AtLh5PoCPsaRbRdah2xhcwTAMooZfjYiNVNkkmmSMaxOQ=="
     },
     "socket.io-parser": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.4.0.tgz",
-      "integrity": "sha512-/G/VOI+3DBp0+DJKW4KesGnQkQPFmUCbA/oO2QGT6CWxU7hLGWqU3tyuzeSK/dqcyeHsQg1vTe9jiZI8GU9SCQ==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.1.tgz",
+      "integrity": "sha512-5JfNykYptCwU2lkOI0ieoePWm+6stEhkZ2UnLDjqnE1YEjUlXXLd1lpxPZ+g+h3rtaytwWkWrLQCaJULlGqjOg==",
       "requires": {
-        "component-emitter": "1.2.1",
-        "debug": "~4.1.0",
-        "isarray": "2.0.1"
+        "component-emitter": "~1.3.0",
+        "debug": "~4.1.0"
       },
       "dependencies": {
         "debug": {
@@ -653,11 +461,6 @@
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
     },
-    "to-array": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/to-array/-/to-array-0.1.4.tgz",
-      "integrity": "sha1-F+bBH3PdTz10zaek/zI46a2b+JA="
-    },
     "toidentifier": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
@@ -688,19 +491,9 @@
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
     },
     "ws": {
-      "version": "7.2.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.3.tgz",
-      "integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ=="
-    },
-    "xmlhttprequest-ssl": {
-      "version": "1.5.5",
-      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
-      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
-    },
-    "yeast": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
-      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
+      "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": "~2.3.0"
+    "socket.io": "^3.0.0"
   },
   "scripts": {
     "start": "node index"

lib/client.ts

@@ -1,10 +1,9 @@
 import { Decoder, Encoder, Packet, PacketType } from "socket.io-parser";
 import debugModule = require("debug");
-import { IncomingMessage } from "http";
-import { Server } from "./index";
-import { Socket } from "./socket";
-import { SocketId } from "socket.io-adapter";
-import { ParentNamespace } from "./parent-namespace";
+import type { IncomingMessage } from "http";
+import type { Namespace, Server } from "./index";
+import type { Socket } from "./socket";
+import type { SocketId } from "socket.io-adapter";
 
 const debug = debugModule("socket.io:client");
 
@@ -17,16 +16,16 @@ export class Client {
   private readonly decoder: Decoder;
   private sockets: Map<SocketId, Socket> = new Map();
   private nsps: Map<string, Socket> = new Map();
-  private connectTimeout: NodeJS.Timeout;
+  private connectTimeout?: NodeJS.Timeout;
 
   /**
    * Client constructor.
    *
-   * @param {Server} server instance
-   * @param {Socket} conn
+   * @param server instance
+   * @param conn
    * @package
    */
-  constructor(server: Server, conn) {
+  constructor(server: Server, conn: Socket) {
     this.server = server;
     this.conn = conn;
     this.encoder = server.encoder;
@@ -84,41 +83,46 @@ export class Client {
       return this.doConnect(name, auth);
     }
 
-    this.server._checkNamespace(name, auth, (dynamicNsp: ParentNamespace) => {
-      if (dynamicNsp) {
-        debug("dynamic namespace %s was created", dynamicNsp.name);
-        this.doConnect(name, auth);
-      } else {
-        debug("creation of namespace %s was denied", name);
-        this._packet({
-          type: PacketType.CONNECT_ERROR,
-          nsp: name,
-          data: {
-            message: "Invalid namespace"
-          }
-        });
+    this.server._checkNamespace(
+      name,
+      auth,
+      (dynamicNspName: Namespace | false) => {
+        if (dynamicNspName) {
+          debug("dynamic namespace %s was created", dynamicNspName);
+          this.doConnect(name, auth);
+        } else {
+          debug("creation of namespace %s was denied", name);
+          this._packet({
+            type: PacketType.CONNECT_ERROR,
+            nsp: name,
+            data: {
+              message: "Invalid namespace",
+            },
+          });
+        }
       }
-    });
+    );
   }
 
   /**
    * Connects a client to a namespace.
    *
-   * @param {String} name - the namespace
+   * @param name - the namespace
    * @param {Object} auth - the auth parameters
    *
    * @private
    */
   private doConnect(name: string, auth: object) {
-    if (this.connectTimeout) {
-      clearTimeout(this.connectTimeout);
-      this.connectTimeout = null;
-    }
     const nsp = this.server.of(name);
 
     const socket = nsp._add(this, auth, () => {
       this.sockets.set(socket.id, socket);
       this.nsps.set(nsp.name, socket);
+
+      if (this.connectTimeout) {
+        clearTimeout(this.connectTimeout);
+        this.connectTimeout = undefined;
+      }
     });
   }
 
@@ -142,7 +146,7 @@ export class Client {
    */
   _remove(socket: Socket) {
     if (this.sockets.has(socket.id)) {
-      const nsp = this.sockets.get(socket.id).nsp.name;
+      const nsp = this.sockets.get(socket.id)!.nsp.name;
       this.sockets.delete(socket.id);
       this.nsps.delete(nsp);
     } else {
@@ -221,7 +225,7 @@ export class Client {
     } else {
       const socket = this.nsps.get(packet.nsp);
       if (socket) {
-        process.nextTick(function() {
+        process.nextTick(function () {
           socket._onpacket(packet);
         });
       } else {
@@ -274,5 +278,10 @@ export class Client {
     this.conn.removeListener("close", this.onclose);
     // @ts-ignore
     this.decoder.removeListener("decoded", this.ondecoded);
+
+    if (this.connectTimeout) {
+      clearTimeout(this.connectTimeout);
+      this.connectTimeout = undefined;
+    }
   }
 }

lib/index.ts

@@ -1,21 +1,21 @@
-import http from "http";
+import http = require("http");
 import { createReadStream } from "fs";
 import { createDeflate, createGzip, createBrotliCompress } from "zlib";
 import accepts = require("accepts");
 import { pipeline } from "stream";
-import path from "path";
-import engine from "engine.io";
+import path = require("path");
+import engine = require("engine.io");
 import { Client } from "./client";
 import { EventEmitter } from "events";
 import { ExtendedError, Namespace } from "./namespace";
 import { ParentNamespace } from "./parent-namespace";
 import { Adapter, Room, SocketId } from "socket.io-adapter";
 import * as parser from "socket.io-parser";
-import { Encoder } from "socket.io-parser";
+import type { Encoder } from "socket.io-parser";
 import debugModule from "debug";
 import { Socket } from "./socket";
-import { CookieSerializeOptions } from "cookie";
-import { CorsOptions } from "cors";
+import type { CookieSerializeOptions } from "cookie";
+import type { CorsOptions } from "cors";
 
 const debug = debugModule("socket.io:server");
 
@@ -23,6 +23,11 @@ const clientVersion = require("../package.json").version;
 const dotMapRegex = /\.map/;
 
 type Transport = "polling" | "websocket";
+type ParentNspNameMatchFn = (
+  name: string,
+  query: object,
+  fn: (err: Error | null, success: boolean) => void
+) => void;
 
 interface EngineOptions {
   /**
@@ -149,7 +154,7 @@ export class Server extends EventEmitter {
   public readonly sockets: Namespace;
 
   /** @private */
-  readonly _parser;
+  readonly _parser: typeof parser;
   /** @private */
   readonly encoder: Encoder;
 
@@ -157,18 +162,10 @@ export class Server extends EventEmitter {
    * @private
    */
   _nsps: Map<string, Namespace> = new Map();
-  private parentNsps: Map<
-    | string
-    | RegExp
-    | ((
-        name: string,
-        query: object,
-        fn: (err: Error, success: boolean) => void
-      ) => void),
-    ParentNamespace
-  > = new Map();
-  private _adapter: any;
+  private parentNsps: Map<ParentNspNameMatchFn, ParentNamespace> = new Map();
+  private _adapter?: typeof Adapter;
   private _serveClient: boolean;
+  private opts: Partial<EngineOptions>;
   private eio;
   private engine;
   private _path: string;
@@ -183,18 +180,24 @@ export class Server extends EventEmitter {
   /**
    * Server constructor.
    *
-   * @param {http.Server|Number|Object} srv http server, port or options
-   * @param {Object} [opts]
+   * @param srv http server, port, or options
+   * @param [opts]
    * @public
    */
   constructor(opts?: Partial<ServerOptions>);
-  constructor(srv: http.Server, opts?: Partial<ServerOptions>);
-  constructor(srv: number, opts?: Partial<ServerOptions>);
-  constructor(srv?: any, opts: Partial<ServerOptions> = {}) {
+  constructor(srv?: http.Server | number, opts?: Partial<ServerOptions>);
+  constructor(
+    srv: undefined | Partial<ServerOptions> | http.Server | number,
+    opts: Partial<ServerOptions> = {}
+  ) {
     super();
-    if ("object" == typeof srv && srv instanceof Object && !srv.listen) {
-      opts = srv;
-      srv = null;
+    if (
+      "object" === typeof srv &&
+      srv instanceof Object &&
+      !(srv as Partial<http.Server>).listen
+    ) {
+      opts = srv as Partial<ServerOptions>;
+      srv = undefined;
     }
     this.path(opts.path || "/socket.io");
     this.connectTimeout(opts.connectTimeout || 45000);
@@ -203,44 +206,45 @@ export class Server extends EventEmitter {
     this.encoder = new this._parser.Encoder();
     this.adapter(opts.adapter || Adapter);
     this.sockets = this.of("/");
-    if (srv) this.attach(srv, opts);
+    this.opts = opts;
+    if (srv) this.attach(srv as http.Server);
   }
 
   /**
    * Sets/gets whether client code is being served.
    *
-   * @param {Boolean} v - whether to serve client code
-   * @return {Server|Boolean} self when setting or value when getting
+   * @param v - whether to serve client code
+   * @return self when setting or value when getting
    * @public
    */
   public serveClient(v: boolean): Server;
   public serveClient(): boolean;
   public serveClient(v?: boolean): Server | boolean {
     if (!arguments.length) return this._serveClient;
-    this._serveClient = v;
+    this._serveClient = v!;
     return this;
   }
 
   /**
    * Executes the middleware for an incoming namespace not already created on the server.
    *
-   * @param {String} name - name of incoming namespace
+   * @param name - name of incoming namespace
    * @param {Object} auth - the auth parameters
-   * @param {Function} fn - callback
+   * @param fn - callback
    *
    * @private
    */
   _checkNamespace(
     name: string,
     auth: object,
-    fn: (nsp: Namespace | boolean) => void
+    fn: (nsp: Namespace | false) => void
   ) {
     if (this.parentNsps.size === 0) return fn(false);
 
     const keysIterator = this.parentNsps.keys();
 
     const run = () => {
-      let nextFn = keysIterator.next();
+      const nextFn = keysIterator.next();
       if (nextFn.done) {
         return fn(false);
       }
@@ -248,7 +252,7 @@ export class Server extends EventEmitter {
         if (err || !allow) {
           run();
         } else {
-          fn(this.parentNsps.get(nextFn.value).createChild(name));
+          fn(this.parentNsps.get(nextFn.value)!.createChild(name));
         }
       });
     };
@@ -268,7 +272,7 @@ export class Server extends EventEmitter {
   public path(v?: string): Server | string {
     if (!arguments.length) return this._path;
 
-    this._path = v.replace(/\/$/, "");
+    this._path = v!.replace(/\/$/, "");
 
     const escapedPath = this._path.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&");
     this.clientPathRegex = new RegExp(
@@ -295,13 +299,13 @@ export class Server extends EventEmitter {
   /**
    * Sets the adapter for rooms.
    *
-   * @param {Adapter} v pathname
-   * @return {Server|Adapter} self when setting or value when getting
+   * @param v pathname
+   * @return self when setting or value when getting
    * @public
    */
-  public adapter(): any;
-  public adapter(v: any);
-  public adapter(v?): Server | any {
+  public adapter(): typeof Adapter | undefined;
+  public adapter(v: typeof Adapter): Server;
+  public adapter(v?: typeof Adapter): typeof Adapter | undefined | Server {
     if (!arguments.length) return this._adapter;
     this._adapter = v;
     for (const nsp of this._nsps.values()) {
@@ -313,28 +317,30 @@ export class Server extends EventEmitter {
   /**
    * Attaches socket.io to a server or port.
    *
-   * @param {http.Server|Number} srv - server or port
-   * @param {Object} opts - options passed to engine.io
-   * @return {Server} self
+   * @param srv - server or port
+   * @param opts - options passed to engine.io
+   * @return self
    * @public
    */
-  public listen(srv: http.Server, opts?: Partial<ServerOptions>): Server;
-  public listen(srv: number, opts?: Partial<ServerOptions>): Server;
-  public listen(srv: any, opts: Partial<ServerOptions> = {}): Server {
+  public listen(
+    srv: http.Server | number,
+    opts: Partial<ServerOptions> = {}
+  ): Server {
     return this.attach(srv, opts);
   }
 
   /**
    * Attaches socket.io to a server or port.
    *
-   * @param {http.Server|Number} srv - server or port
-   * @param {Object} opts - options passed to engine.io
-   * @return {Server} self
+   * @param srv - server or port
+   * @param opts - options passed to engine.io
+   * @return self
    * @public
    */
-  public attach(srv: http.Server, opts?: Partial<ServerOptions>): Server;
-  public attach(port: number, opts?: Partial<ServerOptions>): Server;
-  public attach(srv: any, opts: Partial<ServerOptions> = {}): Server {
+  public attach(
+    srv: http.Server | number,
+    opts: Partial<ServerOptions> = {}
+  ): Server {
     if ("function" == typeof srv) {
       const msg =
         "You are trying to attach socket.io to an express " +
@@ -357,6 +363,8 @@ export class Server extends EventEmitter {
       srv.listen(port);
     }
 
+    // merge the options passed to the Socket.IO server
+    Object.assign(opts, this.opts);
     // set engine.io path to `/socket.io`
     opts.path = opts.path || this._path;
 
@@ -390,10 +398,10 @@ export class Server extends EventEmitter {
   /**
    * Attaches the static file serving.
    *
-   * @param {Function|http.Server} srv http server
+   * @param srv http server
    * @private
    */
-  private attachServe(srv) {
+  private attachServe(srv: http.Server) {
     debug("attaching client serving req handler");
 
     const evs = srv.listeners("request").slice(0);
@@ -412,12 +420,12 @@ export class Server extends EventEmitter {
   /**
    * Handles a request serving of client source and map
    *
-   * @param {http.IncomingMessage} req
-   * @param {http.ServerResponse} res
+   * @param req
+   * @param res
    * @private
    */
   private serve(req: http.IncomingMessage, res: http.ServerResponse) {
-    const filename = req.url.replace(this._path, "");
+    const filename = req.url!.replace(this._path, "");
     const isMap = dotMapRegex.test(filename);
     const type = isMap ? "map" : "source";
 
@@ -466,7 +474,7 @@ export class Server extends EventEmitter {
     );
     const encoding = accepts(req).encodings(["br", "gzip", "deflate"]);
 
-    const onError = err => {
+    const onError = (err: NodeJS.ErrnoException | null) => {
       if (err) {
         res.end();
       }
@@ -496,7 +504,7 @@ export class Server extends EventEmitter {
    * Binds socket.io to an engine.io instance.
    *
    * @param {engine.Server} engine engine.io (or compatible) server
-   * @return {Server} self
+   * @return self
    * @public
    */
   public bind(engine): Server {
@@ -509,7 +517,7 @@ export class Server extends EventEmitter {
    * Called with each incoming transport connection.
    *
    * @param {engine.Socket} conn
-   * @return {Server} self
+   * @return self
    * @private
    */
   private onconnection(conn): Server {
@@ -522,18 +530,11 @@ export class Server extends EventEmitter {
    * Looks up a namespace.
    *
    * @param {String|RegExp|Function} name nsp name
-   * @param {Function} [fn] optional, nsp `connection` ev handler
+   * @param [fn] optional, nsp `connection` ev handler
    * @public
    */
   public of(
-    name:
-      | string
-      | RegExp
-      | ((
-          name: string,
-          query: object,
-          fn: (err: Error, success: boolean) => void
-        ) => void),
+    name: string | RegExp | ParentNspNameMatchFn,
     fn?: (socket: Socket) => void
   ) {
     if (typeof name === "function" || name instanceof RegExp) {
@@ -569,7 +570,7 @@ export class Server extends EventEmitter {
   /**
    * Closes server connection
    *
-   * @param {Function} [fn] optional, called as `fn([err])` on error OR all conns closed
+   * @param [fn] optional, called as `fn([err])` on error OR all conns closed
    * @public
    */
   public close(fn?: (err?: Error) => void): void {
@@ -589,7 +590,7 @@ export class Server extends EventEmitter {
   /**
    * Sets up namespace middleware.
    *
-   * @return {Server} self
+   * @return self
    * @public
    */
   public use(
@@ -602,8 +603,8 @@ export class Server extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param {String} name
-   * @return {Server} self
+   * @param name
+   * @return self
    * @public
    */
   public to(name: Room): Server {
@@ -614,8 +615,8 @@ export class Server extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param {String} name
-   * @return {Server} self
+   * @param name
+   * @return self
    * @public
    */
   public in(name: Room): Server {
@@ -626,24 +627,22 @@ export class Server extends EventEmitter {
   /**
    * Sends a `message` event to all clients.
    *
-   * @return {Server} self
+   * @return self
    * @public
    */
-  public send(...args): Server {
-    args.unshift("message");
-    this.sockets.emit.apply(this.sockets, args);
+  public send(...args: readonly any[]): Server {
+    this.sockets.emit("message", ...args);
     return this;
   }
 
   /**
    * Sends a `message` event to all clients.
    *
-   * @return {Server} self
+   * @return self
    * @public
    */
-  public write(...args): Server {
-    args.unshift("message");
-    this.sockets.emit.apply(this.sockets, args);
+  public write(...args: readonly any[]): Server {
+    this.sockets.emit("message", ...args);
     return this;
   }
 
@@ -659,8 +658,8 @@ export class Server extends EventEmitter {
   /**
    * Sets the compress flag.
    *
-   * @param {Boolean} compress - if `true`, compresses the sending data
-   * @return {Server} self
+   * @param compress - if `true`, compresses the sending data
+   * @return self
    * @public
    */
   public compress(compress: boolean): Server {
@@ -673,7 +672,7 @@ export class Server extends EventEmitter {
    * 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 {Server} self
+   * @return self
    * @public
    */
   public get volatile(): Server {
@@ -684,7 +683,7 @@ export class Server extends EventEmitter {
   /**
    * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
    *
-   * @return {Server} self
+   * @return self
    * @public
    */
   public get local(): Server {
@@ -697,14 +696,14 @@ export class Server extends EventEmitter {
  * Expose main namespace (/).
  */
 
-const emitterMethods = Object.keys(EventEmitter.prototype).filter(function(
+const emitterMethods = Object.keys(EventEmitter.prototype).filter(function (
   key
 ) {
   return typeof EventEmitter.prototype[key] === "function";
 });
 
-emitterMethods.forEach(function(fn) {
-  Server.prototype[fn] = function() {
+emitterMethods.forEach(function (fn) {
+  Server.prototype[fn] = function () {
     return this.sockets[fn].apply(this.sockets, arguments);
   };
 });
@@ -712,4 +711,4 @@ emitterMethods.forEach(function(fn) {
 module.exports = (srv?, opts?) => new Server(srv, opts);
 module.exports.Server = Server;
 
-export { Socket }; // for "connect" event typing
+export { Socket, ServerOptions, Namespace };

lib/namespace.ts

@@ -1,10 +1,10 @@
 import { Socket, RESERVED_EVENTS } from "./socket";
-import { Server } from "./index";
-import { Client } from "./client";
+import type { Server } from "./index";
+import type { Client } from "./client";
 import { EventEmitter } from "events";
 import { PacketType } from "socket.io-parser";
 import debugModule from "debug";
-import { Adapter, Room, SocketId } from "socket.io-adapter";
+import type { Adapter, Room, SocketId } from "socket.io-adapter";
 
 const debug = debugModule("socket.io:namespace");
 
@@ -23,7 +23,7 @@ export class Namespace extends EventEmitter {
 
   /** @private */
   _fns: Array<
-    (socket: Socket, next: (err: ExtendedError) => void) => void
+    (socket: Socket, next: (err?: ExtendedError) => void) => void
   > = [];
 
   /** @private */
@@ -38,8 +38,8 @@ export class Namespace extends EventEmitter {
   /**
    * Namespace constructor.
    *
-   * @param {Server} server instance
-   * @param {string} name
+   * @param server instance
+   * @param name
    */
   constructor(server: Server, name: string) {
     super();
@@ -56,13 +56,13 @@ export class Namespace extends EventEmitter {
    * @private
    */
   _initAdapter(): void {
-    this.adapter = new (this.server.adapter())(this);
+    this.adapter = new (this.server.adapter()!)(this);
   }
 
   /**
    * Sets up namespace middleware.
    *
-   * @return {Namespace} self
+   * @return self
    * @public
    */
   public use(
@@ -75,16 +75,16 @@ export class Namespace extends EventEmitter {
   /**
    * Executes the middleware for an incoming client.
    *
-   * @param {Socket} socket - the socket that will get added
-   * @param {Function} fn - last fn call in the middleware
+   * @param socket - the socket that will get added
+   * @param fn - last fn call in the middleware
    * @private
    */
-  private run(socket: Socket, fn: (err: ExtendedError) => void) {
+  private run(socket: Socket, fn: (err: ExtendedError | null) => void) {
     const fns = this._fns.slice(0);
     if (!fns.length) return fn(null);
 
-    function run(i) {
-      fns[i](socket, function(err) {
+    function run(i: number) {
+      fns[i](socket, function (err) {
         // upon error, short-circuit
         if (err) return fn(err);
 
@@ -102,8 +102,8 @@ export class Namespace extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param {String} name
-   * @return {Namespace} self
+   * @param name
+   * @return self
    * @public
    */
   public to(name: Room): Namespace {
@@ -114,8 +114,8 @@ export class Namespace extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param {String} name
-   * @return {Namespace} self
+   * @param name
+   * @return self
    * @public
    */
   public in(name: Room): Namespace {
@@ -132,13 +132,13 @@ export class Namespace extends EventEmitter {
   _add(client: Client, query, fn?: () => void): Socket {
     debug("adding socket to nsp %s", this.name);
     const socket = new Socket(this, client, query);
-    this.run(socket, err => {
+    this.run(socket, (err) => {
       process.nextTick(() => {
         if ("open" == client.conn.readyState) {
           if (err)
             return socket._error({
               message: err.message,
-              data: err.data
+              data: err.data,
             });
 
           // track socket
@@ -178,11 +178,10 @@ export class Namespace extends EventEmitter {
   /**
    * Emits to all clients.
    *
-   * @return {Namespace} self
+   * @return Always true
    * @public
    */
-  // @ts-ignore
-  public emit(ev: string, ...args: any[]): Namespace {
+  public emit(ev: string | Symbol, ...args: any[]): true {
     if (RESERVED_EVENTS.has(ev)) {
       throw new Error(`"${ev}" is a reserved event name`);
     }
@@ -190,7 +189,7 @@ export class Namespace extends EventEmitter {
     args.unshift(ev);
     const packet = {
       type: PacketType.EVENT,
-      data: args
+      data: args,
     };
 
     if ("function" == typeof args[args.length - 1]) {
@@ -206,40 +205,38 @@ export class Namespace extends EventEmitter {
 
     this.adapter.broadcast(packet, {
       rooms: rooms,
-      flags: flags
+      flags: flags,
     });
 
+    return true;
+  }
+
+  /**
+   * Sends a `message` event to all clients.
+   *
+   * @return self
+   * @public
+   */
+  public send(...args: readonly any[]): Namespace {
+    this.emit("message", ...args);
     return this;
   }
 
   /**
    * Sends a `message` event to all clients.
    *
-   * @return {Namespace} self
+   * @return self
    * @public
    */
-  public send(...args): Namespace {
-    args.unshift("message");
-    this.emit.apply(this, args);
-    return this;
-  }
-
-  /**
-   * Sends a `message` event to all clients.
-   *
-   * @return {Namespace} self
-   * @public
-   */
-  public write(...args): Namespace {
-    args.unshift("message");
-    this.emit.apply(this, args);
+  public write(...args: readonly any[]): Namespace {
+    this.emit("message", ...args);
     return this;
   }
 
   /**
    * Gets a list of clients.
    *
-   * @return {Namespace} self
+   * @return self
    * @public
    */
   public allSockets(): Promise<Set<SocketId>> {
@@ -256,8 +253,8 @@ export class Namespace extends EventEmitter {
   /**
    * Sets the compress flag.
    *
-   * @param {Boolean} compress - if `true`, compresses the sending data
-   * @return {Namespace} self
+   * @param compress - if `true`, compresses the sending data
+   * @return self
    * @public
    */
   public compress(compress: boolean): Namespace {
@@ -270,7 +267,7 @@ export class Namespace extends EventEmitter {
    * 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 {Namespace} self
+   * @return self
    * @public
    */
   public get volatile(): Namespace {
@@ -281,7 +278,7 @@ export class Namespace extends EventEmitter {
   /**
    * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
    *
-   * @return {Namespace} self
+   * @return self
    * @public
    */
   public get local(): Namespace {

lib/parent-namespace.ts

@@ -1,37 +1,41 @@
 import { Namespace } from "./namespace";
+import type { Server } from "./index";
 
 export class ParentNamespace extends Namespace {
   private static count: number = 0;
   private children: Set<Namespace> = new Set();
 
-  constructor(server) {
+  constructor(server: Server) {
     super(server, "/_" + ParentNamespace.count++);
   }
 
-  _initAdapter() {}
+  /**
+   * @private
+   */
+  _initAdapter(): void {
+    /* no-op */
+  }
 
-  public emit(...args): Namespace {
-    this.children.forEach(nsp => {
+  public emit(ev: string | Symbol, ...args: [...any]): true {
+    this.children.forEach((nsp) => {
       nsp._rooms = this._rooms;
       nsp._flags = this._flags;
-      nsp.emit.apply(nsp, args);
+      nsp.emit(ev, ...args);
     });
     this._rooms.clear();
     this._flags = {};
 
-    return this;
+    return true;
   }
 
-  createChild(name) {
+  createChild(name: string): Namespace {
     const namespace = new Namespace(this.server, name);
     namespace._fns = this._fns.slice(0);
-    this.listeners("connect").forEach(listener =>
-      // @ts-ignore
-      namespace.on("connect", listener)
+    this.listeners("connect").forEach((listener) =>
+      namespace.on("connect", listener as (...args: any[]) => void)
     );
-    this.listeners("connection").forEach(listener =>
-      // @ts-ignore
-      namespace.on("connection", listener)
+    this.listeners("connection").forEach((listener) =>
+      namespace.on("connection", listener as (...args: any[]) => void)
     );
     this.children.add(namespace);
     this.server._nsps.set(name, namespace);

lib/socket.ts

@@ -1,25 +1,30 @@
 import { EventEmitter } from "events";
 import { PacketType } from "socket.io-parser";
-import url from "url";
+import url = require("url");
 import debugModule from "debug";
-import { Server } from "./index";
-import { Client } from "./client";
-import { Namespace } from "./namespace";
-import { IncomingMessage } from "http";
-import { Adapter, BroadcastFlags, Room, SocketId } from "socket.io-adapter";
+import type { Server } from "./index";
+import type { Client } from "./client";
+import type { Namespace } from "./namespace";
+import type { IncomingMessage } from "http";
+import type {
+  Adapter,
+  BroadcastFlags,
+  Room,
+  SocketId,
+} from "socket.io-adapter";
 import base64id from "base64id";
 
 const debug = debugModule("socket.io:socket");
 
-export const RESERVED_EVENTS = new Set([
+export const RESERVED_EVENTS = new Set(<const>[
   "connect",
   "connect_error",
   "disconnect",
   "disconnecting",
   // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
   "newListener",
-  "removeListener"
-]);
+  "removeListener",
+]) as ReadonlySet<string | Symbol>;
 
 /**
  * The handshake details
@@ -86,7 +91,7 @@ export class Socket extends EventEmitter {
   > = [];
   private flags: BroadcastFlags = {};
   private _rooms: Set<Room> = new Set();
-  private _anyListeners: Array<(...args: any[]) => void>;
+  private _anyListeners?: Array<(...args: any[]) => void>;
 
   /**
    * Interface to a `Client` for a given `Namespace`.
@@ -120,27 +125,26 @@ export class Socket extends EventEmitter {
       // @ts-ignore
       secure: !!this.request.connection.encrypted,
       issued: +new Date(),
-      url: this.request.url,
-      query: url.parse(this.request.url, true).query,
-      auth
+      url: this.request.url!,
+      query: url.parse(this.request.url!, true).query,
+      auth,
     };
   }
 
   /**
    * Emits to this client.
    *
-   * @return {Socket} self
+   * @return Always returns `true`.
    * @public
    */
-  // @ts-ignore
-  public emit(ev: string, ...args: any[]) {
+  public emit(ev: string, ...args: any[]): boolean {
     if (RESERVED_EVENTS.has(ev)) {
       throw new Error(`"${ev}" is a reserved event name`);
     }
     args.unshift(ev);
     const packet: any = {
       type: PacketType.EVENT,
-      data: args
+      data: args,
     };
 
     // access last argument to see if it's an ACK callback
@@ -165,23 +169,23 @@ export class Socket extends EventEmitter {
       this.adapter.broadcast(packet, {
         except: new Set([this.id]),
         rooms: rooms,
-        flags: flags
+        flags: flags,
       });
     } else {
       // dispatch packet
       this.packet(packet, flags);
     }
-    return this;
+    return true;
   }
 
   /**
    * Targets a room when broadcasting.
    *
-   * @param {String} name
-   * @return {Socket} self
+   * @param name
+   * @return self
    * @public
    */
-  public to(name: Room) {
+  public to(name: Room): Socket {
     this._rooms.add(name);
     return this;
   }
@@ -189,8 +193,8 @@ export class Socket extends EventEmitter {
   /**
    * Targets a room when broadcasting.
    *
-   * @param {String} name
-   * @return {Socket} self
+   * @param name
+   * @return self
    * @public
    */
   public in(name: Room): Socket {
@@ -201,24 +205,22 @@ export class Socket extends EventEmitter {
   /**
    * Sends a `message` event.
    *
-   * @return {Socket} self
+   * @return self
    * @public
    */
-  public send(...args): Socket {
-    args.unshift("message");
-    this.emit.apply(this, args);
+  public send(...args: readonly any[]): Socket {
+    this.emit("message", ...args);
     return this;
   }
 
   /**
    * Sends a `message` event.
    *
-   * @return {Socket} self
+   * @return self
    * @public
    */
-  public write(...args): Socket {
-    args.unshift("message");
-    this.emit.apply(this, args);
+  public write(...args: readonly any[]): Socket {
+    this.emit("message", ...args);
     return this;
   }
 
@@ -342,7 +344,7 @@ export class Socket extends EventEmitter {
         listener.apply(this, args);
       }
     }
-    super.emit.apply(this, args);
+    this.dispatch(args);
   }
 
   /**
@@ -354,7 +356,7 @@ export class Socket extends EventEmitter {
   private ack(id: number) {
     const self = this;
     let sent = false;
-    return function() {
+    return function () {
       // prevent double callbacks
       if (sent) return;
       const args = Array.prototype.slice.call(arguments);
@@ -363,7 +365,7 @@ export class Socket extends EventEmitter {
       self.packet({
         id: id,
         type: PacketType.ACK,
-        data: args
+        data: args,
       });
 
       sent = true;
@@ -418,7 +420,7 @@ export class Socket extends EventEmitter {
    *
    * @private
    */
-  _onclose(reason: string) {
+  _onclose(reason: string): Socket | undefined {
     if (!this.connected) return this;
     debug("closing socket - reason %s", reason);
     super.emit("disconnecting", reason);
@@ -428,6 +430,7 @@ export class Socket extends EventEmitter {
     this.connected = false;
     this.disconnected = true;
     super.emit("disconnect", reason);
+    return;
   }
 
   /**
@@ -508,6 +511,65 @@ export class Socket extends EventEmitter {
     return this;
   }
 
+  /**
+   * Dispatch incoming event to socket listeners.
+   *
+   * @param {Array} event - event that will get emitted
+   * @private
+   */
+  private dispatch(event): void {
+    debug("dispatching an event %j", event);
+    this.run(event, (err) => {
+      process.nextTick(() => {
+        if (err) {
+          return this._onerror(err);
+        }
+        super.emit.apply(this, event);
+      });
+    });
+  }
+
+  /**
+   * Sets up socket middleware.
+   *
+   * @param {Function} fn - middleware function (event, next)
+   * @return {Socket} self
+   * @public
+   */
+  public use(
+    fn: (event: Array<any>, next: (err: Error) => void) => void
+  ): Socket {
+    this.fns.push(fn);
+    return this;
+  }
+
+  /**
+   * Executes the middleware for an incoming event.
+   *
+   * @param {Array} event - event that will get emitted
+   * @param {Function} fn - last fn call in the middleware
+   * @private
+   */
+  private run(event: Array<any>, fn: (err: Error | null) => void) {
+    const fns = this.fns.slice(0);
+    if (!fns.length) return fn(null);
+
+    function run(i) {
+      fns[i](event, function (err) {
+        // upon error, short-circuit
+        if (err) return fn(err);
+
+        // if no middleware left, summon callback
+        if (!fns[i + 1]) return fn(null);
+
+        // go on to next
+        run(i + 1);
+      });
+    }
+
+    run(0);
+  }
+
   /**
    * A reference to the request that originated the underlying Engine.IO Socket.
    *

package.json

@@ -1,6 +1,6 @@
 {
   "name": "socket.io",
-  "version": "3.0.0",
+  "version": "3.0.5",
   "description": "node.js realtime framework server",
   "keywords": [
     "realtime",
@@ -14,8 +14,15 @@
   "files": [
     "dist/",
     "client-dist/",
-    "wrapper.mjs"
+    "wrapper.mjs",
+    "!**/*.tsbuildinfo"
   ],
+  "directories": {
+    "doc": "docs/",
+    "example": "example/",
+    "lib": "lib/",
+    "test": "test/"
+  },
   "type": "commonjs",
   "main": "./dist/index.js",
   "exports": {
@@ -29,36 +36,38 @@
     "url": "git://github.com/socketio/socket.io"
   },
   "scripts": {
-    "test": "npm run format:check && tsc && nyc mocha --require ts-node/register --reporter spec --slow 200 --bail --timeout 10000 test/socket.io.ts",
-    "format:check": "prettier --check 'lib/**/*.ts' 'test/**/*.ts'",
-    "format:fix": "prettier --write 'lib/**/*.ts' 'test/**/*.ts'",
-    "prepack": "tsc"
+    "compile": "rimraf ./dist && tsc",
+    "test": "npm run format:check && npm run compile && nyc mocha --require ts-node/register --reporter spec --slow 200 --bail --timeout 10000 test/socket.io.ts",
+    "format:check": "prettier --check \"lib/**/*.ts\" \"test/**/*.ts\"",
+    "format:fix": "prettier --write \"lib/**/*.ts\" \"test/**/*.ts\"",
+    "prepack": "npm run compile"
   },
   "dependencies": {
+    "@types/cookie": "^0.4.0",
+    "@types/cors": "^2.8.8",
+    "@types/node": "^14.14.10",
     "accepts": "~1.3.4",
     "base64id": "~2.0.0",
-    "debug": "~4.1.0",
-    "engine.io": "~4.0.0",
+    "debug": "~4.3.1",
+    "engine.io": "~4.0.6",
     "socket.io-adapter": "~2.0.3",
-    "socket.io-parser": "~4.0.1"
+    "socket.io-parser": "~4.0.3"
   },
   "devDependencies": {
-    "@types/cookie": "^0.4.0",
-    "@types/cors": "^2.8.7",
-    "@types/mocha": "^8.0.3",
-    "@types/node": "^14.11.2",
+    "@types/mocha": "^8.0.4",
     "babel-eslint": "^10.1.0",
-    "eslint": "^7.9.0",
+    "eslint": "^7.14.0",
     "eslint-config-prettier": "^6.11.0",
     "expect.js": "0.3.1",
     "mocha": "^3.5.3",
-    "nyc": "^11.2.1",
-    "prettier": "^1.19.1",
-    "socket.io-client": "3.0.0",
-    "superagent": "^3.8.2",
-    "supertest": "^3.0.0",
+    "nyc": "^15.1.0",
+    "prettier": "^2.2.0",
+    "rimraf": "^3.0.2",
+    "socket.io-client": "3.0.5",
+    "superagent": "^6.1.0",
+    "supertest": "^6.0.1",
     "ts-node": "^9.0.0",
-    "typescript": "^4.0.3"
+    "typescript": "^4.1.2"
   },
   "contributors": [
     {

test/support/util.ts

@@ -3,15 +3,15 @@ const i = expect.stringify;
 
 // add support for Set/Map
 const contain = expect.Assertion.prototype.contain;
-expect.Assertion.prototype.contain = function(...args) {
+expect.Assertion.prototype.contain = function (...args) {
   if (typeof this.obj === "object") {
-    args.forEach(obj => {
+    args.forEach((obj) => {
       this.assert(
         this.obj.has(obj),
-        function() {
+        function () {
           return "expected " + i(this.obj) + " to contain " + i(obj);
         },
-        function() {
+        function () {
           return "expected " + i(this.obj) + " to not contain " + i(obj);
         }
       );

tsconfig.json

@@ -1,11 +1,20 @@
 {
   "compilerOptions": {
     "outDir": "./dist",
-    "allowJs": true,
     "target": "es2017",
     "module": "commonjs",
     "declaration": true,
-    "esModuleInterop": true
+    "esModuleInterop": true,
+
+    "incremental": true,
+    "skipLibCheck": true,
+
+    "strict": true,
+    "noImplicitAny": false,
+    "noImplicitThis": false,
+    "strictPropertyInitialization": false,
+    "noImplicitReturns": true,
+    "importsNotUsedAsValues": "error",
   },
   "include": [
     "./lib/**/*"