chore(release): 4.0.1

Diff: https://github.com/socketio/socket.io/compare/4.0.0...4.0.1

CHANGELOG.md

@@ -1,3 +1,28 @@
+## [4.0.1](https://github.com/socketio/socket.io/compare/4.0.0...4.0.1) (2021-03-31)
+
+
+### Bug Fixes
+
+* **typings:** add fallback to untyped event listener ([#3834](https://github.com/socketio/socket.io/issues/3834)) ([a11152f](https://github.com/socketio/socket.io/commit/a11152f42b281df83409313962f60f230239c79e))
+* **typings:** update return type from emit ([#3843](https://github.com/socketio/socket.io/issues/3843)) ([1a72ae4](https://github.com/socketio/socket.io/commit/1a72ae4fe27a14cf60916f991a2c94da91d9e54a))
+
+
+# [4.0.0](https://github.com/socketio/socket.io/compare/3.1.2...4.0.0) (2021-03-10)
+
+
+### Bug Fixes
+
+* make io.to(...) immutable ([ac9e8ca](https://github.com/socketio/socket.io/commit/ac9e8ca6c71e00d4af45ee03f590fe56f3951186))
+
+
+### Features
+
+* add some utility methods ([b25495c](https://github.com/socketio/socket.io/commit/b25495c069031674da08e19aed68922c7c7a0e28))
+* add support for typed events ([#3822](https://github.com/socketio/socket.io/issues/3822)) ([0107510](https://github.com/socketio/socket.io/commit/0107510ba8a0f148c78029d8be8919b350feb633))
+* allow to exclude specific rooms when broadcasting ([#3789](https://github.com/socketio/socket.io/issues/3789)) ([7de2e87](https://github.com/socketio/socket.io/commit/7de2e87e888d849eb2dfc5e362af4c9e86044701))
+* allow to pass an array to io.to(...) ([085d1de](https://github.com/socketio/socket.io/commit/085d1de9df909651de8b313cc6f9f253374b702e))
+
+
 ## [3.1.2](https://github.com/socketio/socket.io/compare/3.1.1...3.1.2) (2021-02-26)
 
 

client-dist/socket.io.js

@@ -1,5 +1,5 @@
 /*!
- * Socket.IO v3.1.2
+ * Socket.IO v4.0.1
  * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
@@ -12,7 +12,7 @@
 		exports["io"] = factory();
 	else
 		root["io"] = factory();
-})(this, function() {
+})(self, function() {
 return /******/ (function(modules) { // webpackBootstrap
 /******/ 	// The module cache
 /******/ 	var installedModules = {};
@@ -215,6 +215,7 @@ Object.defineProperty(exports, "Manager", {
     return manager_2.Manager;
   }
 });
+exports["default"] = lookup;
 
 /***/ }),
 
@@ -236,10 +237,6 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
-function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }
-
-function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }
-
 function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
 
 function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
@@ -263,18 +260,18 @@ var eio = __webpack_require__(/*! engine.io-client */ "./node_modules/engine.io-
 
 var socket_1 = __webpack_require__(/*! ./socket */ "./build/socket.js");
 
-var Emitter = __webpack_require__(/*! component-emitter */ "./node_modules/component-emitter/index.js");
-
 var parser = __webpack_require__(/*! socket.io-parser */ "./node_modules/socket.io-parser/dist/index.js");
 
 var on_1 = __webpack_require__(/*! ./on */ "./build/on.js");
 
 var Backoff = __webpack_require__(/*! backo2 */ "./node_modules/backo2/index.js");
 
+var typed_events_1 = __webpack_require__(/*! ./typed-events */ "./build/typed-events.js");
+
 var debug = __webpack_require__(/*! debug */ "./node_modules/debug/src/browser.js")("socket.io-client:manager");
 
-var Manager = /*#__PURE__*/function (_Emitter) {
-  _inherits(Manager, _Emitter);
+var Manager = /*#__PURE__*/function (_typed_events_1$Stric) {
+  _inherits(Manager, _typed_events_1$Stric);
 
   var _super = _createSuper(Manager);
 
@@ -425,7 +422,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
         self.cleanup();
         self._readyState = "closed";
 
-        _get(_getPrototypeOf(Manager.prototype), "emit", _this2).call(_this2, "error", err);
+        _this2.emitReserved("error", err);
 
         if (fn) {
           fn(err);
@@ -450,6 +447,11 @@ var Manager = /*#__PURE__*/function (_Emitter) {
           socket.close();
           socket.emit("error", new Error("timeout"));
         }, timeout);
+
+        if (this.opts.autoUnref) {
+          timer.unref();
+        }
+
         this.subs.push(function subDestroy() {
           clearTimeout(timer);
         });
@@ -485,9 +487,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
       this.cleanup(); // mark as open
 
       this._readyState = "open";
-
-      _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "open"); // add new subs
-
+      this.emitReserved("open"); // add new subs
 
       var socket = this.engine;
       this.subs.push(on_1.on(socket, "ping", this.onping.bind(this)), on_1.on(socket, "data", this.ondata.bind(this)), on_1.on(socket, "error", this.onerror.bind(this)), on_1.on(socket, "close", this.onclose.bind(this)), on_1.on(this.decoder, "decoded", this.ondecoded.bind(this)));
@@ -501,7 +501,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
   }, {
     key: "onping",
     value: function onping() {
-      _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "ping");
+      this.emitReserved("ping");
     }
     /**
      * Called with data.
@@ -523,7 +523,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
   }, {
     key: "ondecoded",
     value: function ondecoded(packet) {
-      _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "packet", packet);
+      this.emitReserved("packet", packet);
     }
     /**
      * Called upon socket error.
@@ -535,8 +535,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
     key: "onerror",
     value: function onerror(err) {
       debug("error", err);
-
-      _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "error", err);
+      this.emitReserved("error", err);
     }
     /**
      * Creates a new socket for the given `nsp`.
@@ -661,8 +660,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
       this.cleanup();
       this.backoff.reset();
       this._readyState = "closed";
-
-      _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "close", reason);
+      this.emitReserved("close", reason);
 
       if (this._reconnection && !this.skipReconnect) {
         this.reconnect();
@@ -685,9 +683,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
       if (this.backoff.attempts >= this._reconnectionAttempts) {
         debug("reconnect failed");
         this.backoff.reset();
-
-        _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "reconnect_failed");
-
+        this.emitReserved("reconnect_failed");
         this._reconnecting = false;
       } else {
         var delay = this.backoff.duration();
@@ -697,7 +693,7 @@ var Manager = /*#__PURE__*/function (_Emitter) {
           if (self.skipReconnect) return;
           debug("attempting reconnect");
 
-          _get(_getPrototypeOf(Manager.prototype), "emit", _this3).call(_this3, "reconnect_attempt", self.backoff.attempts); // check again for the case socket closed in above events
+          _this3.emitReserved("reconnect_attempt", self.backoff.attempts); // check again for the case socket closed in above events
 
 
           if (self.skipReconnect) return;
@@ -707,13 +703,18 @@ var Manager = /*#__PURE__*/function (_Emitter) {
               self._reconnecting = false;
               self.reconnect();
 
-              _get(_getPrototypeOf(Manager.prototype), "emit", _this3).call(_this3, "reconnect_error", err);
+              _this3.emitReserved("reconnect_error", err);
             } else {
               debug("reconnect success");
               self.onreconnect();
             }
           });
         }, delay);
+
+        if (this.opts.autoUnref) {
+          timer.unref();
+        }
+
         this.subs.push(function subDestroy() {
           clearTimeout(timer);
         });
@@ -731,13 +732,12 @@ var Manager = /*#__PURE__*/function (_Emitter) {
       var attempt = this.backoff.attempts;
       this._reconnecting = false;
       this.backoff.reset();
-
-      _get(_getPrototypeOf(Manager.prototype), "emit", this).call(this, "reconnect", attempt);
+      this.emitReserved("reconnect", attempt);
     }
   }]);
 
   return Manager;
-}(Emitter);
+}(typed_events_1.StrictEventEmitter);
 
 exports.Manager = Manager;
 
@@ -818,10 +818,10 @@ exports.Socket = void 0;
 
 var socket_io_parser_1 = __webpack_require__(/*! socket.io-parser */ "./node_modules/socket.io-parser/dist/index.js");
 
-var Emitter = __webpack_require__(/*! component-emitter */ "./node_modules/component-emitter/index.js");
-
 var on_1 = __webpack_require__(/*! ./on */ "./build/on.js");
 
+var typed_events_1 = __webpack_require__(/*! ./typed-events */ "./build/typed-events.js");
+
 var debug = __webpack_require__(/*! debug */ "./node_modules/debug/src/browser.js")("socket.io-client:socket");
 /**
  * Internal events.
@@ -839,8 +839,8 @@ var RESERVED_EVENTS = Object.freeze({
   removeListener: 1
 });
 
-var Socket = /*#__PURE__*/function (_Emitter) {
-  _inherits(Socket, _Emitter);
+var Socket = /*#__PURE__*/function (_typed_events_1$Stric) {
+  _inherits(Socket, _typed_events_1$Stric);
 
   var _super = _createSuper(Socket);
 
@@ -942,7 +942,6 @@ var Socket = /*#__PURE__*/function (_Emitter) {
      * Override `emit`.
      * If the event is in `events`, it's emitted normally.
      *
-     * @param ev - event name
      * @return self
      * @public
      */
@@ -1038,7 +1037,7 @@ var Socket = /*#__PURE__*/function (_Emitter) {
     key: "onerror",
     value: function onerror(err) {
       if (!this.connected) {
-        _get(_getPrototypeOf(Socket.prototype), "emit", this).call(this, "connect_error", err);
+        this.emitReserved("connect_error", err);
       }
     }
     /**
@@ -1055,8 +1054,7 @@ var Socket = /*#__PURE__*/function (_Emitter) {
       this.connected = false;
       this.disconnected = true;
       delete this.id;
-
-      _get(_getPrototypeOf(Socket.prototype), "emit", this).call(this, "disconnect", reason);
+      this.emitReserved("disconnect", reason);
     }
     /**
      * Called with socket packet.
@@ -1077,7 +1075,7 @@ var Socket = /*#__PURE__*/function (_Emitter) {
             var id = packet.data.sid;
             this.onconnect(id);
           } else {
-            _get(_getPrototypeOf(Socket.prototype), "emit", this).call(this, "connect_error", new Error("It seems you are trying to reach a Socket.IO server in v2.x with a v3.x client, but they are not compatible (more information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/)"));
+            this.emitReserved("connect_error", new Error("It seems you are trying to reach a Socket.IO server in v2.x with a v3.x client, but they are not compatible (more information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/)"));
           }
 
           break;
@@ -1106,9 +1104,7 @@ var Socket = /*#__PURE__*/function (_Emitter) {
           var err = new Error(packet.data.message); // @ts-ignore
 
           err.data = packet.data.data;
-
-          _get(_getPrototypeOf(Socket.prototype), "emit", this).call(this, "connect_error", err);
-
+          this.emitReserved("connect_error", err);
           break;
       }
     }
@@ -1220,9 +1216,7 @@ var Socket = /*#__PURE__*/function (_Emitter) {
       this.id = id;
       this.connected = true;
       this.disconnected = false;
-
-      _get(_getPrototypeOf(Socket.prototype), "emit", this).call(this, "connect");
-
+      this.emitReserved("connect");
       this.emitBuffered();
     }
     /**
@@ -1429,12 +1423,172 @@ var Socket = /*#__PURE__*/function (_Emitter) {
   }]);
 
   return Socket;
-}(Emitter);
+}(typed_events_1.StrictEventEmitter);
 
 exports.Socket = Socket;
 
 /***/ }),
 
+/***/ "./build/typed-events.js":
+/*!*******************************!*\
+  !*** ./build/typed-events.js ***!
+  \*******************************/
+/*! no static exports found */
+/***/ (function(module, exports, __webpack_require__) {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }
+
+function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.StrictEventEmitter = void 0;
+
+var Emitter = __webpack_require__(/*! component-emitter */ "./node_modules/component-emitter/index.js");
+/**
+ * Strictly typed version of an `EventEmitter`. A `TypedEventEmitter` takes type
+ * parameters for mappings of event names to event data types, and strictly
+ * types method calls to the `EventEmitter` according to these event maps.
+ *
+ * @typeParam ListenEvents - `EventsMap` of user-defined events that can be
+ * listened to with `on` or `once`
+ * @typeParam EmitEvents - `EventsMap` of user-defined events that can be
+ * emitted with `emit`
+ * @typeParam ReservedEvents - `EventsMap` of reserved events, that can be
+ * emitted by socket.io with `emitReserved`, and can be listened to with
+ * `listen`.
+ */
+
+
+var StrictEventEmitter = /*#__PURE__*/function (_Emitter) {
+  _inherits(StrictEventEmitter, _Emitter);
+
+  var _super = _createSuper(StrictEventEmitter);
+
+  function StrictEventEmitter() {
+    _classCallCheck(this, StrictEventEmitter);
+
+    return _super.apply(this, arguments);
+  }
+
+  _createClass(StrictEventEmitter, [{
+    key: "on",
+
+    /**
+     * Adds the `listener` function as an event listener for `ev`.
+     *
+     * @param ev Name of the event
+     * @param listener Callback function
+     */
+    value: function on(ev, listener) {
+      _get(_getPrototypeOf(StrictEventEmitter.prototype), "on", this).call(this, ev, listener);
+
+      return this;
+    }
+    /**
+     * Adds a one-time `listener` function as an event listener for `ev`.
+     *
+     * @param ev Name of the event
+     * @param listener Callback function
+     */
+
+  }, {
+    key: "once",
+    value: function once(ev, listener) {
+      _get(_getPrototypeOf(StrictEventEmitter.prototype), "once", this).call(this, ev, listener);
+
+      return this;
+    }
+    /**
+     * Emits an event.
+     *
+     * @param ev Name of the event
+     * @param args Values to send to listeners of this event
+     */
+
+  }, {
+    key: "emit",
+    value: function emit(ev) {
+      var _get2;
+
+      for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+        args[_key - 1] = arguments[_key];
+      }
+
+      (_get2 = _get(_getPrototypeOf(StrictEventEmitter.prototype), "emit", this)).call.apply(_get2, [this, ev].concat(args));
+
+      return this;
+    }
+    /**
+     * Emits a reserved event.
+     *
+     * This method is `protected`, so that only a class extending
+     * `StrictEventEmitter` can emit its own reserved events.
+     *
+     * @param ev Reserved event name
+     * @param args Arguments to emit along with the event
+     */
+
+  }, {
+    key: "emitReserved",
+    value: function emitReserved(ev) {
+      var _get3;
+
+      for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
+        args[_key2 - 1] = arguments[_key2];
+      }
+
+      (_get3 = _get(_getPrototypeOf(StrictEventEmitter.prototype), "emit", this)).call.apply(_get3, [this, ev].concat(args));
+
+      return this;
+    }
+    /**
+     * Returns the listeners listening to an event.
+     *
+     * @param event Event name
+     * @returns Array of listeners subscribed to `event`
+     */
+
+  }, {
+    key: "listeners",
+    value: function listeners(event) {
+      return _get(_getPrototypeOf(StrictEventEmitter.prototype), "listeners", this).call(this, event);
+    }
+  }]);
+
+  return StrictEventEmitter;
+}(Emitter);
+
+exports.StrictEventEmitter = StrictEventEmitter;
+
+/***/ }),
+
 /***/ "./build/url.js":
 /*!**********************!*\
   !*** ./build/url.js ***!
@@ -2442,6 +2596,14 @@ var Socket = /*#__PURE__*/function (_Emitter) {
           _this.transport.close();
         }
       }, false);
+
+      if (_this.hostname !== "localhost") {
+        _this.offlineEventListener = function () {
+          _this.onClose("transport close");
+        };
+
+        addEventListener("offline", _this.offlineEventListener, false);
+      }
     }
 
     _this.open();
@@ -2765,6 +2927,10 @@ var Socket = /*#__PURE__*/function (_Emitter) {
       this.pingTimeoutTimer = setTimeout(function () {
         _this2.onClose("ping timeout");
       }, this.pingInterval + this.pingTimeout);
+
+      if (this.opts.autoUnref) {
+        this.pingTimeoutTimer.unref();
+      }
     }
     /**
      * Called on `drain` event
@@ -2949,7 +3115,12 @@ var Socket = /*#__PURE__*/function (_Emitter) {
 
         this.transport.close(); // ignore further transport communication
 
-        this.transport.removeAllListeners(); // set ready state
+        this.transport.removeAllListeners();
+
+        if (typeof removeEventListener === "function") {
+          removeEventListener("offline", this.offlineEventListener, false);
+        } // set ready state
+
 
         this.readyState = "closed"; // clear session id
 
@@ -3046,6 +3217,8 @@ var parser = __webpack_require__(/*! engine.io-parser */ "./node_modules/engine.
 
 var Emitter = __webpack_require__(/*! component-emitter */ "./node_modules/component-emitter/index.js");
 
+var debug = __webpack_require__(/*! debug */ "./node_modules/debug/src/browser.js")("engine.io-client:transport");
+
 var Transport = /*#__PURE__*/function (_Emitter) {
   _inherits(Transport, _Emitter);
 
@@ -3132,7 +3305,8 @@ var Transport = /*#__PURE__*/function (_Emitter) {
       if ("open" === this.readyState) {
         this.write(packets);
       } else {
-        throw new Error("Transport not open");
+        // this might happen if the transport was silently closed in the beforeunload event handler
+        debug("transport is not open, discarding packets");
       }
     }
     /**
@@ -3198,7 +3372,7 @@ module.exports = Transport;
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-var XMLHttpRequest = __webpack_require__(/*! xmlhttprequest-ssl */ "./node_modules/engine.io-client/lib/xmlhttprequest.js");
+var XMLHttpRequest = __webpack_require__(/*! ../../contrib/xmlhttprequest-ssl/XMLHttpRequest */ "./node_modules/engine.io-client/lib/xmlhttprequest.js");
 
 var XHR = __webpack_require__(/*! ./polling-xhr */ "./node_modules/engine.io-client/lib/transports/polling-xhr.js");
 
@@ -3531,7 +3705,7 @@ function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Re
 function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 /* global attachEvent */
-var XMLHttpRequest = __webpack_require__(/*! xmlhttprequest-ssl */ "./node_modules/engine.io-client/lib/xmlhttprequest.js");
+var XMLHttpRequest = __webpack_require__(/*! ../../contrib/xmlhttprequest-ssl/XMLHttpRequest */ "./node_modules/engine.io-client/lib/xmlhttprequest.js");
 
 var Polling = __webpack_require__(/*! ./polling */ "./node_modules/engine.io-client/lib/transports/polling.js");
 
@@ -3698,7 +3872,7 @@ var Request = /*#__PURE__*/function (_Emitter) {
   _createClass(Request, [{
     key: "create",
     value: function create() {
-      var opts = pick(this.opts, "agent", "enablesXDR", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized");
+      var opts = pick(this.opts, "agent", "enablesXDR", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized", "autoUnref");
       opts.xdomain = !!this.opts.xd;
       opts.xscheme = !!this.opts.xs;
       var xhr = this.xhr = new XMLHttpRequest(opts);
@@ -4321,22 +4495,24 @@ var WS = /*#__PURE__*/function (_Transport) {
   }, {
     key: "addEventListeners",
     value: function addEventListeners() {
-      var self = this;
+      var _this2 = this;
 
       this.ws.onopen = function () {
-        self.onOpen();
+        if (_this2.opts.autoUnref) {
+          _this2.ws._socket.unref();
+        }
+
+        _this2.onOpen();
       };
 
-      this.ws.onclose = function () {
-        self.onClose();
-      };
+      this.ws.onclose = this.onClose.bind(this);
 
       this.ws.onmessage = function (ev) {
-        self.onData(ev.data);
+        return _this2.onData(ev.data);
       };
 
       this.ws.onerror = function (e) {
-        self.onError("websocket error", e);
+        return _this2.onError("websocket error", e);
       };
     }
     /**

examples/.gitignore

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

examples/angular-todomvc/package.json

@@ -21,8 +21,8 @@
     "@angular/platform-browser-dynamic": "~11.0.4",
     "@angular/router": "~11.0.4",
     "rxjs": "~6.6.0",
-    "socket.io": "^3.0.4",
-    "socket.io-client": "^3.0.4",
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0",
     "tslib": "^2.0.0",
     "zone.js": "~0.10.2"
   },

examples/angular-todomvc/server.ts

@@ -1,4 +1,4 @@
-import { Server, Socket } from "socket.io";
+import { Server } from "socket.io";
 
 const io = new Server(8080, {
   cors: {
@@ -15,7 +15,7 @@ interface Todo {
 
 let todos: Array<Todo> = [];
 
-io.on("connect", (socket: Socket) => {
+io.on("connect", (socket) => {
     socket.emit("todos", todos);
 
     // note: we could also create a CRUD (create/read/update/delete) service for the todo list

examples/chat/package-lock.json

@@ -1,499 +0,0 @@
-{
-  "name": "socket.io-chat",
-  "version": "0.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
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-      "version": "1.3.7",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
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-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
-    },
-    "array-flatten": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
-    },
-    "base64id": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
-      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
-    },
-    "body-parser": {
-      "version": "1.19.0",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
-      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
-      "requires": {
-        "bytes": "3.1.0",
-        "content-type": "~1.0.4",
-        "debug": "2.6.9",
-        "depd": "~1.1.2",
-        "http-errors": "1.7.2",
-        "iconv-lite": "0.4.24",
-        "on-finished": "~2.3.0",
-        "qs": "6.7.0",
-        "raw-body": "2.4.0",
-        "type-is": "~1.6.17"
-      }
-    },
-    "bytes": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
-      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
-    },
-    "component-emitter": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
-      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
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-      "version": "0.5.3",
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-      "requires": {
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-    "content-type": {
-      "version": "1.0.4",
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-      "integrity": "sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==",
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-        "depd": "~1.1.2",
-        "destroy": "~1.0.4",
-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "etag": "~1.8.1",
-        "fresh": "0.5.2",
-        "http-errors": "~1.7.2",
-        "mime": "1.6.0",
-        "ms": "2.1.1",
-        "on-finished": "~2.3.0",
-        "range-parser": "~1.2.1",
-        "statuses": "~1.5.0"
-      },
-      "dependencies": {
-        "ms": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
-          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
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-      }
-    },
-    "serve-static": {
-      "version": "1.14.1",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
-      "integrity": "sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==",
-      "requires": {
-        "encodeurl": "~1.0.2",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "0.17.1"
-      }
-    },
-    "setprototypeof": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
-      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
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-    "socket.io": {
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-      "integrity": "sha512-arLQtd+UoJ08NXBRBGUJDyQ9B+cc9WwD67hc5s1WQcs2DyAkYzI5HWg4U0CrFtK00kjyAWxBGhLwVbfOeMqz1A==",
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-        "accepts": "~1.3.4",
-        "base64id": "~2.0.0",
-        "debug": "~4.1.0",
-        "engine.io": "~4.0.0",
-        "socket.io-adapter": "~2.0.3",
-        "socket.io-parser": "~4.0.1"
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-    "statuses": {
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-      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
-    },
-    "toidentifier": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
-      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
-    },
-    "type-is": {
-      "version": "1.6.18",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
-      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
-      "requires": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.24"
-      }
-    },
-    "unpipe": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
-    },
-    "utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
-    },
-    "vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
-    },
-    "ws": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
-      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
-    }
-  }
-}

examples/chat/package.json

@@ -8,7 +8,7 @@
   "license": "BSD",
   "dependencies": {
     "express": "~4.17.1",
-    "socket.io": "^3.0.0"
+    "socket.io": "^4.0.0"
   },
   "scripts": {
     "start": "node index.js"

examples/chat/public/main.js

@@ -72,7 +72,7 @@ $(function() {
   }
 
   // Adds the visual chat message to the message list
-  const addChatMessage = (data, options) => {
+  const addChatMessage = (data, options = {}) => {
     // Don't fade the message in if there is an 'X was typing'
     const $typingMessages = getTypingMessages(data);
     if ($typingMessages.length !== 0) {

examples/cluster-haproxy/server/package.json

@@ -8,7 +8,7 @@
   "license": "BSD",
   "dependencies": {
     "express": "4.13.4",
-    "socket.io": "^3.1.0",
+    "socket.io": "^4.0.0",
     "socket.io-redis": "^6.0.1"
   },
   "scripts": {

examples/cluster-httpd/server/package.json

@@ -8,7 +8,7 @@
   "license": "BSD",
   "dependencies": {
     "express": "4.13.4",
-    "socket.io": "^3.1.0",
+    "socket.io": "^4.0.0",
     "socket.io-redis": "^6.0.1"
   },
   "scripts": {

examples/cluster-nginx/client/package.json

@@ -7,7 +7,7 @@
   "private": true,
   "license": "MIT",
   "dependencies": {
-    "socket.io-client": "^3.1.0"
+    "socket.io-client": "^4.0.0"
   },
   "scripts": {
     "start": "node index.js"

examples/cluster-nginx/server/package.json

@@ -8,7 +8,7 @@
   "license": "MIT",
   "dependencies": {
     "express": "4.13.4",
-    "socket.io": "^3.1.0",
+    "socket.io": "^4.0.0",
     "socket.io-redis": "^6.0.1"
   },
   "scripts": {

examples/cluster-traefik/server/package.json

@@ -8,7 +8,7 @@
   "license": "MIT",
   "dependencies": {
     "express": "4.13.4",
-    "socket.io": "^3.1.0",
+    "socket.io": "^4.0.0",
     "socket.io-redis": "^6.0.1"
   },
   "scripts": {

examples/create-react-app-example/package.json

@@ -9,8 +9,8 @@
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-scripts": "3.4.1",
-    "socket.io": "^2.3.0",
-    "socket.io-client": "^2.3.0"
+    "socket.io": "4",
+    "socket.io-client": "4"
   },
   "scripts": {
     "start": "react-scripts start",

examples/create-react-app-example/server.js

@@ -1,4 +1,8 @@
-const io = require('socket.io')();
+const io = require('socket.io')({
+  cors: {
+    origin: ['http://localhost:3000']
+  }
+});
 
 io.on('connection', socket => {
   console.log(`connect: ${socket.id}`);

examples/custom-parsers/package.json

@@ -12,10 +12,10 @@
     "component-emitter": "^1.2.1",
     "express": "^4.15.2",
     "schemapack": "^1.4.2",
-    "socket.io": "socketio/socket.io",
-    "socket.io-client": "socketio/socket.io-client",
-    "socket.io-json-parser": "^1.0.0",
-    "socket.io-msgpack-parser": "^1.0.0",
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0",
+    "socket.io-json-parser": "^3.0.0",
+    "socket.io-msgpack-parser": "^3.0.1",
     "webpack": "^2.4.1"
   }
 }

examples/custom-parsers/public/.gitignore

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

examples/custom-parsers/src/custom-parser.js

@@ -40,12 +40,12 @@ const errorPacket = {
 };
 
 class Encoder {
-  encode (packet, callback) {
+  encode (packet) {
     switch (packet.type) {
       case TYPES.EVENT:
-        return callback([ this.pack(packet) ]);
+        return [ this.pack(packet) ];
       default:
-        return callback([ JSON.stringify(packet) ]);
+        return [ JSON.stringify(packet) ];
     }
   }
   pack (packet) {

examples/custom-parsers/src/server.js

@@ -14,15 +14,22 @@ const msgpackParser = require('socket.io-msgpack-parser');
 const jsonParser = require('socket.io-json-parser');
 const customParser = require('./custom-parser');
 
-let server1 = io(3001, {});
+const cors = {
+  origin: ["http://localhost:3000"]
+}
+
+let server1 = io(3001, { cors });
 let server2 = io(3002, {
-  parser: msgpackParser
+  parser: msgpackParser,
+  cors
 });
 let server3 = io(3003, {
-  parser: jsonParser
+  parser: jsonParser,
+  cors
 });
 let server4 = io(3004, {
-  parser: customParser
+  parser: customParser,
+  cors
 });
 
 let string = [];

examples/es-modules/package-lock.json

@@ -1,217 +0,0 @@
-{
-  "name": "es-modules",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "@types/component-emitter": {
-      "version": "1.2.10",
-      "resolved": "https://registry.npmjs.org/@types/component-emitter/-/component-emitter-1.2.10.tgz",
-      "integrity": "sha512-bsjleuRKWmGqajMerkzox19aGbscQX5rmmvvXl3wlIp5gMG1HgkiwPxsN5p070fBDKTNSPgojVbuY1+HWMbFhg=="
-    },
-    "accepts": {
-      "version": "1.3.7",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
-      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
-    },
-    "backo2": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
-      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
-    },
-    "base64-arraybuffer": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.4.tgz",
-      "integrity": "sha1-mBjHngWbE1X5fgQooBfIOOkLqBI="
-    },
-    "base64id": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
-      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
-    },
-    "component-bind": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/component-bind/-/component-bind-1.0.0.tgz",
-      "integrity": "sha1-AMYIq33Nk4l8AAllGx06jh5zu9E="
-    },
-    "component-emitter": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
-      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
-    },
-    "cookie": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
-      "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA=="
-    },
-    "cors": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
-      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
-      "requires": {
-        "object-assign": "^4",
-        "vary": "^1"
-      }
-    },
-    "debug": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
-      "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
-      "requires": {
-        "ms": "^2.1.1"
-      }
-    },
-    "engine.io": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-4.0.1.tgz",
-      "integrity": "sha512-6EaSBxasBUwxRdf6B68SEYpD3tcrG80J4YTzHl/D+9Q+vM0AMHZabfYcc2WdnvEaQxZjX/UZsa+UdGoM0qQQkQ==",
-      "requires": {
-        "accepts": "~1.3.4",
-        "base64id": "2.0.0",
-        "cookie": "~0.4.1",
-        "cors": "~2.8.5",
-        "debug": "~4.1.0",
-        "engine.io-parser": "~4.0.0",
-        "ws": "^7.1.2"
-      }
-    },
-    "engine.io-client": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-4.0.1.tgz",
-      "integrity": "sha512-3XXfWrEutlf1vg5PlS805bD+AgZXhRIKYAG04f1iCGOs70dWEYlZGfCZUNwPwNx05lBCKs1lIeL3SkLB0P++xw==",
-      "requires": {
-        "base64-arraybuffer": "0.1.4",
-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0",
-        "engine.io-parser": "~4.0.1",
-        "has-cors": "1.1.0",
-        "parseqs": "0.0.6",
-        "parseuri": "0.0.6",
-        "ws": "~7.2.1",
-        "xmlhttprequest-ssl": "~1.5.4",
-        "yeast": "0.1.2"
-      },
-      "dependencies": {
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-          "version": "7.2.5",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.5.tgz",
-          "integrity": "sha512-C34cIU4+DB2vMyAbmEKossWq2ZQDr6QEyuuCzWrM9zfw1sGc0mYiJ0UnG9zzNykt49C2Fi34hvr2vssFQRS6EA=="
-        }
-      }
-    },
-    "engine.io-parser": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.1.tgz",
-      "integrity": "sha512-v5aZK1hlckcJDGmHz3W8xvI3NUHYc9t8QtTbqdR5OaH3S9iJZilPubauOm+vLWOMMWzpE3hiq92l9lTAHamRCg=="
-    },
-    "has-cors": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/has-cors/-/has-cors-1.1.0.tgz",
-      "integrity": "sha1-XkdHk/fqmEPRu5nCPu9J/xJv/zk="
-    },
-    "mime-db": {
-      "version": "1.44.0",
-      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.44.0.tgz",
-      "integrity": "sha512-/NOTfLrsPBVeH7YtFPgsVWveuL+4SjjYxaQ1xtM1KMFj7HdxlBlxeyNLzhyJVx7r4rZGJAZ/6lkKCitSc/Nmpg=="
-    },
-    "mime-types": {
-      "version": "2.1.27",
-      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.27.tgz",
-      "integrity": "sha512-JIhqnCasI9yD+SsmkquHBxTSEuZdQX5BuQnS2Vc7puQQQ+8yiP5AY5uWhpdv4YL4VM5c6iliiYWPgJ/nJQLp7w==",
-      "requires": {
-        "mime-db": "1.44.0"
-      }
-    },
-    "ms": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
-    },
-    "negotiator": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
-      "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw=="
-    },
-    "object-assign": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
-      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
-    },
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-    },
-    "xmlhttprequest-ssl": {
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-      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
-      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
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-    }
-  }
-}

examples/es-modules/package.json

@@ -9,7 +9,7 @@
     "node": ">=12.17.0"
   },
   "dependencies": {
-    "socket.io": "^3.0.0",
-    "socket.io-client": "^3.0.0"
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0"
   }
 }

examples/passport-example/index.js

@@ -51,9 +51,9 @@ app.post(
 app.post("/logout", (req, res) => {
   console.log(`logout ${req.session.id}`);
   const socketId = req.session.socketId;
-  if (socketId && io.of("/").connected[socketId]) {
+  if (socketId && io.of("/").sockets.get(socketId)) {
     console.log(`forcefully closing socket ${socketId}`);
-    io.sockets.connected[socketId].disconnect(true);
+    io.of("/").sockets.get(socketId).disconnect(true);
   }
   req.logout();
   res.cookie("connect.sid", "", { expires: new Date() });

examples/passport-example/package-lock.json

@@ -1,783 +0,0 @@
-{
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-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
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-      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8="
-    },
-    "array-flatten": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
-    },
-    "arraybuffer.slice": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
-      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog=="
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-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
-      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ=="
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-      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
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-      "integrity": "sha1-c5JncZI7Whl0etZmqlzUv5xunOg="
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-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
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-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
-    },
-    "vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
-    },
-    "ws": {
-      "version": "7.3.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.0.tgz",
-      "integrity": "sha512-iFtXzngZVXPGgpTlP1rBqsUK82p9tKqsWRPg5L56egiljujJT3vGAYnHANvFxBieXrTFavhzhxW52jnaWV+w2w=="
-    },
-    "xmlhttprequest-ssl": {
-      "version": "1.5.5",
-      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
-      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
-    },
-    "yeast": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
-      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
-    }
-  }
-}

examples/passport-example/package.json

@@ -8,7 +8,7 @@
     "express-session": "~1.17.1",
     "passport": "~0.4.1",
     "passport-local": "~1.0.0",
-    "socket.io": "~2.3.0"
+    "socket.io": "^4.0.0"
   },
   "scripts": {
     "start": "node index.js"

examples/private-messaging/package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "core-js": "^3.6.5",
-    "socket.io-client": "^3.1.1",
+    "socket.io-client": "^4.0.0",
     "vue": "^2.6.11"
   },
   "devDependencies": {

examples/private-messaging/server/package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "@socket.io/sticky": "^1.0.0",
     "ioredis": "^4.22.0",
-    "socket.io": "^3.1.1",
+    "socket.io": "^4.0.0",
     "socket.io-redis": "^6.0.1"
   }
 }

examples/react-native/package.json

@@ -13,8 +13,8 @@
     "react-dom": "~16.9.0",
     "react-native": "https://github.com/expo/react-native/archive/sdk-37.0.1.tar.gz",
     "react-native-web": "~0.11.7",
-    "socket.io": "^3.0.1",
-    "socket.io-client": "^3.0.1"
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0"
   },
   "devDependencies": {
     "babel-preset-expo": "~8.1.0",

examples/tweet-stream/index.js

@@ -7,7 +7,11 @@ const twitter = new Twitter({
   token_secret: process.env.TWITTER_TOKEN_SECRET
 });
 
-const io = require('socket.io')(process.env.PORT || 3000);
+const io = require('socket.io')(process.env.PORT || 3000, {
+  cors: {
+    origin: true
+  }
+});
 
 twitter.track('socket.io');
 twitter.track('javascript');

examples/tweet-stream/package-lock.json

@@ -1,705 +0,0 @@
-{
-  "name": "socket.io-tweet-stream",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
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-      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
-    },
-    "after": {
-      "version": "0.8.2",
-      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
-      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8="
-    },
-    "ajv": {
-      "version": "6.12.0",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.0.tgz",
-      "integrity": "sha512-D6gFiFA0RRLyUbvijN74DWAjXSFxWKaWP7mldxkVhyhAV3+SWA9HEJPHQ2c9soIeTFJqcSdFDGFgdqs1iUU2Hw==",
-      "requires": {
-        "fast-deep-equal": "^3.1.1",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
-        "uri-js": "^4.2.2"
-      }
-    },
-    "arraybuffer.slice": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
-      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog=="
-    },
-    "asn1": {
-      "version": "0.2.4",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
-      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
-      "requires": {
-        "safer-buffer": "~2.1.0"
-      }
-    },
-    "assert-plus": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
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-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.9.1.tgz",
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examples/tweet-stream/package.json

@@ -15,6 +15,6 @@
   "license": "MIT",
   "dependencies": {
     "node-tweet-stream": "^2.0.1",
-    "socket.io": "~2.3.0"
+    "socket.io": "^4.0.0"
   }
 }

examples/typescript/package-lock.json

@@ -1,295 +0,0 @@
-{
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-    },
-    "@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": {
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-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0",
-        "engine.io-parser": "~4.0.1",
-        "has-cors": "1.1.0",
-        "parseqs": "0.0.6",
-        "parseuri": "0.0.6",
-        "ws": "~7.2.1",
-        "xmlhttprequest-ssl": "~1.5.4",
-        "yeast": "0.1.2"
-      },
-      "dependencies": {
-        "ws": {
-          "version": "7.2.5",
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-          "integrity": "sha512-C34cIU4+DB2vMyAbmEKossWq2ZQDr6QEyuuCzWrM9zfw1sGc0mYiJ0UnG9zzNykt49C2Fi34hvr2vssFQRS6EA=="
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-        "@types/cors": "^2.8.8",
-        "@types/node": "^14.14.7",
-        "accepts": "~1.3.4",
-        "base64id": "~2.0.0",
-        "debug": "~4.1.0",
-        "engine.io": "~4.0.0",
-        "socket.io-adapter": "~2.0.3",
-        "socket.io-parser": "~4.0.1"
-      }
-    },
-    "socket.io-adapter": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.0.3.tgz",
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-        "component-emitter": "~1.3.0",
-        "debug": "~4.1.0",
-        "engine.io-client": "~4.0.0",
-        "parseuri": "0.0.6",
-        "socket.io-parser": "~4.0.1"
-      }
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-      "version": "4.0.2",
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-        "source-map": "^0.6.0"
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-      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-9.0.0.tgz",
-      "integrity": "sha512-/TqB4SnererCDR/vb4S/QvSZvzQMJN8daAslg7MeaiHvD8rDZsSfXmNeNumyZZzMned72Xoq/isQljYSt8Ynfg==",
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-        "arg": "^4.1.0",
-        "diff": "^4.0.1",
-        "make-error": "^1.1.1",
-        "source-map-support": "^0.5.17",
-        "yn": "3.1.1"
-      }
-    },
-    "typescript": {
-      "version": "4.0.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.5.tgz",
-      "integrity": "sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ=="
-    },
-    "vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
-    },
-    "ws": {
-      "version": "7.4.2",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.2.tgz",
-      "integrity": "sha512-T4tewALS3+qsrpGI/8dqNMLIVdq/g/85U98HPMa6F0m6xTbvhXU6RCQLqPH3+SlomNV/LdY6RXEbBpMH6EOJnA=="
-    },
-    "xmlhttprequest-ssl": {
-      "version": "1.5.5",
-      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
-      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
-    },
-    "yeast": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
-      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk="
-    },
-    "yn": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
-      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q=="
-    }
-  }
-}

examples/typescript/package.json

@@ -11,8 +11,8 @@
   "author": "Damien Arrachequesne",
   "license": "MIT",
   "dependencies": {
-    "socket.io": "^3.0.4",
-    "socket.io-client": "^3.0.4",
+    "socket.io": "^4.0.0",
+    "socket.io-client": "^4.0.0",
     "ts-node": "^9.0.0",
     "typescript": "^4.0.5"
   }

examples/typescript/server.ts

@@ -1,8 +1,8 @@
-import { Server, Socket } from "socket.io";
+import { Server } from "socket.io";
 
 const io = new Server(8080);
 
-io.on("connect", (socket: Socket) => {
+io.on("connect", (socket) => {
     console.log(`connect ${socket.id}`);
 
     socket.on("ping", (cb) => {

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

@@ -1,8 +1,7 @@
 
 const server = require('http').createServer();
 const io = require('socket.io')(server, {
-  serveClient: false,
-  wsEngine: 'ws' // uws is not supported since it is a native module
+  serveClient: false
 });
 const port = process.env.PORT || 3000;
 

examples/webpack-build-server/package.json

@@ -9,7 +9,7 @@
   "author": "Damien Arrachequesne",
   "license": "MIT",
   "devDependencies": {
-    "socket.io": "~2.3.0",
+    "socket.io": "^4.0.0",
     "webpack": "~4.43.0",
     "webpack-cli": "~3.3.11"
   }

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

@@ -5,5 +5,6 @@ module.exports = {
   output: {
     path: require('path').join(__dirname, '../dist'),
     filename: 'server.js'
-  }
+  },
+  mode: 'production'
 };

examples/whiteboard/package-lock.json

@@ -1,499 +0,0 @@
-{
-  "name": "whiteboard",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "accepts": {
-      "version": "1.3.7",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
-      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
-    },
-    "array-flatten": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
-    },
-    "base64id": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
-      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
-    },
-    "body-parser": {
-      "version": "1.19.0",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
-      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
-      "requires": {
-        "bytes": "3.1.0",
-        "content-type": "~1.0.4",
-        "debug": "2.6.9",
-        "depd": "~1.1.2",
-        "http-errors": "1.7.2",
-        "iconv-lite": "0.4.24",
-        "on-finished": "~2.3.0",
-        "qs": "6.7.0",
-        "raw-body": "2.4.0",
-        "type-is": "~1.6.17"
-      }
-    },
-    "bytes": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
-      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
-    },
-    "component-emitter": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
-      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
-    },
-    "content-disposition": {
-      "version": "0.5.3",
-      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
-      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
-      "requires": {
-        "safe-buffer": "5.1.2"
-      }
-    },
-    "content-type": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
-      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
-    },
-    "cookie": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
-      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg=="
-    },
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-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
-      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
-      "requires": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.24"
-      }
-    },
-    "unpipe": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
-    },
-    "utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
-    },
-    "vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
-    },
-    "ws": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
-      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
-    }
-  }
-}

examples/whiteboard/package.json

@@ -9,7 +9,7 @@
   ],
   "dependencies": {
     "express": "~4.17.1",
-    "socket.io": "^3.0.0"
+    "socket.io": "^4.0.0"
   },
   "scripts": {
     "start": "node index"

lib/broadcast-operator.ts

@@ -0,0 +1,315 @@
+import type { BroadcastFlags, Room, SocketId } from "socket.io-adapter";
+import { Handshake, RESERVED_EVENTS, Socket } from "./socket";
+import { PacketType } from "socket.io-parser";
+import type { Adapter } from "socket.io-adapter";
+import type {
+  EventParams,
+  EventNames,
+  EventsMap,
+  TypedEventBroadcaster,
+} from "./typed-events";
+
+export class BroadcastOperator<EmitEvents extends EventsMap>
+  implements TypedEventBroadcaster<EmitEvents> {
+  constructor(
+    private readonly adapter: Adapter,
+    private readonly rooms: Set<Room> = new Set<Room>(),
+    private readonly exceptRooms: Set<Room> = new Set<Room>(),
+    private readonly flags: BroadcastFlags = {}
+  ) {}
+
+  /**
+   * Targets a room when emitting.
+   *
+   * @param room
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    const rooms = new Set(this.rooms);
+    if (Array.isArray(room)) {
+      room.forEach((r) => rooms.add(r));
+    } else {
+      rooms.add(room);
+    }
+    return new BroadcastOperator(
+      this.adapter,
+      rooms,
+      this.exceptRooms,
+      this.flags
+    );
+  }
+
+  /**
+   * Targets a room when emitting.
+   *
+   * @param room
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.to(room);
+  }
+
+  /**
+   * Excludes a room when emitting.
+   *
+   * @param room
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    const exceptRooms = new Set(this.exceptRooms);
+    if (Array.isArray(room)) {
+      room.forEach((r) => exceptRooms.add(r));
+    } else {
+      exceptRooms.add(room);
+    }
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      exceptRooms,
+      this.flags
+    );
+  }
+
+  /**
+   * Sets the compress flag.
+   *
+   * @param compress - if `true`, compresses the sending data
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags, { compress });
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      this.exceptRooms,
+      flags
+    );
+  }
+
+  /**
+   * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
+   * receive messages (because of network slowness or other issues, or because they’re connected through long polling
+   * and is in the middle of a request-response cycle).
+   *
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public get volatile(): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags, { volatile: true });
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      this.exceptRooms,
+      flags
+    );
+  }
+
+  /**
+   * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
+   *
+   * @return a new BroadcastOperator instance
+   * @public
+   */
+  public get local(): BroadcastOperator<EmitEvents> {
+    const flags = Object.assign({}, this.flags, { local: true });
+    return new BroadcastOperator(
+      this.adapter,
+      this.rooms,
+      this.exceptRooms,
+      flags
+    );
+  }
+
+  /**
+   * Emits to all clients.
+   *
+   * @return Always true
+   * @public
+   */
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    if (RESERVED_EVENTS.has(ev)) {
+      throw new Error(`"${ev}" is a reserved event name`);
+    }
+    // set up packet object
+    const data = [ev, ...args];
+    const packet = {
+      type: PacketType.EVENT,
+      data: data,
+    };
+
+    if ("function" == typeof data[data.length - 1]) {
+      throw new Error("Callbacks are not supported when broadcasting");
+    }
+
+    this.adapter.broadcast(packet, {
+      rooms: this.rooms,
+      except: this.exceptRooms,
+      flags: this.flags,
+    });
+
+    return true;
+  }
+
+  /**
+   * Gets a list of clients.
+   *
+   * @public
+   */
+  public allSockets(): Promise<Set<SocketId>> {
+    if (!this.adapter) {
+      throw new Error(
+        "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
+      );
+    }
+    return this.adapter.sockets(this.rooms);
+  }
+
+  /**
+   * Returns the matching socket instances
+   *
+   * @public
+   */
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+    return this.adapter
+      .fetchSockets({
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      })
+      .then((sockets) => {
+        return sockets.map((socket) => {
+          if (socket instanceof Socket) {
+            // FIXME the TypeScript compiler complains about missing private properties
+            return (socket as unknown) as RemoteSocket<EmitEvents>;
+          } else {
+            return new RemoteSocket(this.adapter, socket as SocketDetails);
+          }
+        });
+      });
+  }
+
+  /**
+   * Makes the matching socket instances join the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsJoin(room: Room | Room[]): void {
+    this.adapter.addSockets(
+      {
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      },
+      Array.isArray(room) ? room : [room]
+    );
+  }
+
+  /**
+   * Makes the matching socket instances leave the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsLeave(room: Room | Room[]): void {
+    this.adapter.delSockets(
+      {
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      },
+      Array.isArray(room) ? room : [room]
+    );
+  }
+
+  /**
+   * Makes the matching socket instances disconnect
+   *
+   * @param close - whether to close the underlying connection
+   * @public
+   */
+  public disconnectSockets(close: boolean = false): void {
+    this.adapter.disconnectSockets(
+      {
+        rooms: this.rooms,
+        except: this.exceptRooms,
+      },
+      close
+    );
+  }
+}
+
+/**
+ * Format of the data when the Socket instance exists on another Socket.IO server
+ */
+interface SocketDetails {
+  id: SocketId;
+  handshake: Handshake;
+  rooms: Room[];
+  data: any;
+}
+
+/**
+ * Expose of subset of the attributes and methods of the Socket class
+ */
+export class RemoteSocket<EmitEvents extends EventsMap>
+  implements TypedEventBroadcaster<EmitEvents> {
+  public readonly id: SocketId;
+  public readonly handshake: Handshake;
+  public readonly rooms: Set<Room>;
+  public readonly data: any;
+
+  private readonly operator: BroadcastOperator<EmitEvents>;
+
+  constructor(adapter: Adapter, details: SocketDetails) {
+    this.id = details.id;
+    this.handshake = details.handshake;
+    this.rooms = new Set(details.rooms);
+    this.data = details.data;
+    this.operator = new BroadcastOperator(adapter, new Set([this.id]));
+  }
+
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    return this.operator.emit(ev, ...args);
+  }
+
+  /**
+   * Joins a room.
+   *
+   * @param {String|Array} room - room or array of rooms
+   * @public
+   */
+  public join(room: Room | Room[]): void {
+    return this.operator.socketsJoin(room);
+  }
+
+  /**
+   * Leaves a room.
+   *
+   * @param {String} room
+   * @public
+   */
+  public leave(room: Room): void {
+    return this.operator.socketsLeave(room);
+  }
+
+  /**
+   * Disconnects this client.
+   *
+   * @param {Boolean} close - if `true`, closes the underlying connection
+   * @return {Socket} self
+   *
+   * @public
+   */
+  public disconnect(close = false): this {
+    this.operator.disconnectSockets(close);
+    return this;
+  }
+}

lib/client.ts

@@ -3,20 +3,24 @@ import debugModule = require("debug");
 import url = require("url");
 import type { IncomingMessage } from "http";
 import type { Namespace, Server } from "./index";
+import type { EventsMap } from "./typed-events";
 import type { Socket } from "./socket";
 import type { SocketId } from "socket.io-adapter";
 
 const debug = debugModule("socket.io:client");
 
-export class Client {
+export class Client<
+  ListenEvents extends EventsMap,
+  EmitEvents extends EventsMap
+> {
   public readonly conn;
 
   private readonly id: string;
-  private readonly server: Server;
+  private readonly server: Server<ListenEvents, EmitEvents>;
   private readonly encoder: Encoder;
   private readonly decoder: Decoder;
-  private sockets: Map<SocketId, Socket> = new Map();
-  private nsps: Map<string, Socket> = new Map();
+  private sockets: Map<SocketId, Socket<ListenEvents, EmitEvents>> = new Map();
+  private nsps: Map<string, Socket<ListenEvents, EmitEvents>> = new Map();
   private connectTimeout?: NodeJS.Timeout;
 
   /**
@@ -26,7 +30,7 @@ export class Client {
    * @param conn
    * @package
    */
-  constructor(server: Server, conn: Socket) {
+  constructor(server: Server<ListenEvents, EmitEvents>, conn: any) {
     this.server = server;
     this.conn = conn;
     this.encoder = server.encoder;
@@ -87,7 +91,7 @@ export class Client {
     this.server._checkNamespace(
       name,
       auth,
-      (dynamicNspName: Namespace | false) => {
+      (dynamicNspName: Namespace<ListenEvents, EmitEvents> | false) => {
         if (dynamicNspName) {
           debug("dynamic namespace %s was created", dynamicNspName);
           this.doConnect(name, auth);
@@ -145,7 +149,7 @@ export class Client {
    *
    * @private
    */
-  _remove(socket: Socket): void {
+  _remove(socket: Socket<ListenEvents, EmitEvents>): void {
     if (this.sockets.has(socket.id)) {
       const nsp = this.sockets.get(socket.id)!.nsp.name;
       this.sockets.delete(socket.id);

lib/index.ts

@@ -7,7 +7,11 @@ import path = require("path");
 import engine = require("engine.io");
 import { Client } from "./client";
 import { EventEmitter } from "events";
-import { ExtendedError, Namespace } from "./namespace";
+import {
+  ExtendedError,
+  Namespace,
+  NamespaceReservedEventsMap,
+} from "./namespace";
 import { ParentNamespace } from "./parent-namespace";
 import { Adapter, Room, SocketId } from "socket.io-adapter";
 import * as parser from "socket.io-parser";
@@ -16,6 +20,13 @@ import debugModule from "debug";
 import { Socket } from "./socket";
 import type { CookieSerializeOptions } from "cookie";
 import type { CorsOptions } from "cors";
+import type { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
+import {
+  EventsMap,
+  DefaultEventsMap,
+  EventParams,
+  StrictEventEmitter,
+} from "./typed-events";
 
 const debug = debugModule("socket.io:server");
 
@@ -32,7 +43,7 @@ type ParentNspNameMatchFn = (
 interface EngineOptions {
   /**
    * how many ms without a pong packet to consider the connection closed
-   * @default 5000
+   * @default 20000
    */
   pingTimeout: number;
   /**
@@ -82,10 +93,12 @@ interface EngineOptions {
   httpCompression: boolean | object;
   /**
    * what WebSocket server implementation to use. Specified module must
-   * conform to the ws interface (see ws module api docs). Default value is ws.
-   * An alternative c++ addon is also available by installing uws module.
+   * conform to the ws interface (see ws module api docs).
+   * An alternative c++ addon is also available by installing eiows module.
+   *
+   * @default `require("ws").Server`
    */
-  wsEngine: string;
+  wsEngine: Function;
   /**
    * an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
    */
@@ -155,8 +168,15 @@ interface ServerOptions extends EngineAttachOptions {
   connectTimeout: number;
 }
 
-export class Server extends EventEmitter {
-  public readonly sockets: Namespace;
+export class Server<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends StrictEventEmitter<
+  {},
+  EmitEvents,
+  NamespaceReservedEventsMap<ListenEvents, EmitEvents>
+> {
+  public readonly sockets: Namespace<ListenEvents, EmitEvents>;
 
   /** @private */
   readonly _parser: typeof parser;
@@ -166,8 +186,11 @@ export class Server extends EventEmitter {
   /**
    * @private
    */
-  _nsps: Map<string, Namespace> = new Map();
-  private parentNsps: Map<ParentNspNameMatchFn, ParentNamespace> = new Map();
+  _nsps: Map<string, Namespace<ListenEvents, EmitEvents>> = new Map();
+  private parentNsps: Map<
+    ParentNspNameMatchFn,
+    ParentNamespace<ListenEvents, EmitEvents>
+  > = new Map();
   private _adapter?: typeof Adapter;
   private _serveClient: boolean;
   private opts: Partial<EngineOptions>;
@@ -247,7 +270,7 @@ export class Server extends EventEmitter {
   _checkNamespace(
     name: string,
     auth: { [key: string]: any },
-    fn: (nsp: Namespace | false) => void
+    fn: (nsp: Namespace<ListenEvents, EmitEvents> | false) => void
   ): void {
     if (this.parentNsps.size === 0) return fn(false);
 
@@ -556,8 +579,8 @@ export class Server extends EventEmitter {
    */
   public of(
     name: string | RegExp | ParentNspNameMatchFn,
-    fn?: (socket: Socket) => void
-  ): Namespace {
+    fn?: (socket: Socket<ListenEvents, EmitEvents>) => void
+  ): Namespace<ListenEvents, EmitEvents> {
     if (typeof name === "function" || name instanceof RegExp) {
       const parentNsp = new ParentNamespace(this);
       debug("initializing parent namespace %s", parentNsp.name);
@@ -615,7 +638,10 @@ export class Server extends EventEmitter {
    * @public
    */
   public use(
-    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
+    fn: (
+      socket: Socket<ListenEvents, EmitEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   ): this {
     this.sockets.use(fn);
     return this;
@@ -624,24 +650,34 @@ export class Server extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public to(name: Room): this {
-    this.sockets.to(name);
-    return this;
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.sockets.to(room);
   }
 
   /**
    * Targets a room when emitting.
    *
+   * @param room
+   * @return self
+   * @public
+   */
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return this.sockets.in(room);
+  }
+
+  /**
+   * Excludes a room when emitting.
+   *
    * @param name
    * @return self
    * @public
    */
-  public in(name: Room): this {
-    this.sockets.in(name);
+  public except(name: Room | Room[]): Server<ListenEvents, EmitEvents> {
+    this.sockets.except(name);
     return this;
   }
 
@@ -651,7 +687,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.sockets.emit("message", ...args);
     return this;
   }
@@ -662,7 +698,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.sockets.emit("message", ...args);
     return this;
   }
@@ -683,9 +719,8 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public compress(compress: boolean): this {
-    this.sockets.compress(compress);
-    return this;
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+    return this.sockets.compress(compress);
   }
 
   /**
@@ -696,9 +731,8 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public get volatile(): this {
-    this.sockets.volatile;
-    return this;
+  public get volatile(): BroadcastOperator<EmitEvents> {
+    return this.sockets.volatile;
   }
 
   /**
@@ -707,9 +741,47 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public get local(): this {
-    this.sockets.local;
-    return this;
+  public get local(): BroadcastOperator<EmitEvents> {
+    return this.sockets.local;
+  }
+
+  /**
+   * Returns the matching socket instances
+   *
+   * @public
+   */
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+    return this.sockets.fetchSockets();
+  }
+
+  /**
+   * Makes the matching socket instances join the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsJoin(room: Room | Room[]): void {
+    return this.sockets.socketsJoin(room);
+  }
+
+  /**
+   * Makes the matching socket instances leave the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsLeave(room: Room | Room[]): void {
+    return this.sockets.socketsLeave(room);
+  }
+
+  /**
+   * Makes the matching socket instances disconnect
+   *
+   * @param close - whether to close the underlying connection
+   * @public
+   */
+  public disconnectSockets(close: boolean = false): void {
+    return this.sockets.disconnectSockets(close);
   }
 }
 
@@ -732,4 +804,4 @@ emitterMethods.forEach(function (fn) {
 module.exports = (srv?, opts?) => new Server(srv, opts);
 module.exports.Server = Server;
 
-export { Socket, ServerOptions, Namespace };
+export { Socket, ServerOptions, Namespace, BroadcastOperator, RemoteSocket };

lib/namespace.ts

@@ -1,10 +1,16 @@
-import { Socket, RESERVED_EVENTS } from "./socket";
+import { Socket } from "./socket";
 import type { Server } from "./index";
+import {
+  EventParams,
+  EventNames,
+  EventsMap,
+  StrictEventEmitter,
+  DefaultEventsMap,
+} from "./typed-events";
 import type { Client } from "./client";
-import { EventEmitter } from "events";
-import { PacketType } from "socket.io-parser";
 import debugModule from "debug";
 import type { Adapter, Room, SocketId } from "socket.io-adapter";
+import { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
 
 const debug = debugModule("socket.io:namespace");
 
@@ -12,26 +18,41 @@ export interface ExtendedError extends Error {
   data?: any;
 }
 
-export class Namespace extends EventEmitter {
+export interface NamespaceReservedEventsMap<
+  ListenEvents extends EventsMap,
+  EmitEvents extends EventsMap
+> {
+  connect: (socket: Socket<ListenEvents, EmitEvents>) => void;
+  connection: (socket: Socket<ListenEvents, EmitEvents>) => void;
+}
+
+export class Namespace<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends StrictEventEmitter<
+  {},
+  EmitEvents,
+  NamespaceReservedEventsMap<ListenEvents, EmitEvents>
+> {
   public readonly name: string;
-  public readonly sockets: Map<SocketId, Socket> = new Map();
+  public readonly sockets: Map<
+    SocketId,
+    Socket<ListenEvents, EmitEvents>
+  > = new Map();
 
   public adapter: Adapter;
 
   /** @private */
-  readonly server: Server;
+  readonly server: Server<ListenEvents, EmitEvents>;
 
   /** @private */
   _fns: Array<
-    (socket: Socket, next: (err?: ExtendedError) => void) => void
+    (
+      socket: Socket<ListenEvents, EmitEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   > = [];
 
-  /** @private */
-  _rooms: Set<Room> = new Set();
-
-  /** @private */
-  _flags: any = {};
-
   /** @private */
   _ids: number = 0;
 
@@ -41,7 +62,7 @@ export class Namespace extends EventEmitter {
    * @param server instance
    * @param name
    */
-  constructor(server: Server, name: string) {
+  constructor(server: Server<ListenEvents, EmitEvents>, name: string) {
     super();
     this.server = server;
     this.name = name;
@@ -66,7 +87,10 @@ export class Namespace extends EventEmitter {
    * @public
    */
   public use(
-    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
+    fn: (
+      socket: Socket<ListenEvents, EmitEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   ): this {
     this._fns.push(fn);
     return this;
@@ -79,7 +103,10 @@ export class Namespace extends EventEmitter {
    * @param fn - last fn call in the middleware
    * @private
    */
-  private run(socket: Socket, fn: (err: ExtendedError | null) => void) {
+  private run(
+    socket: Socket<ListenEvents, EmitEvents>,
+    fn: (err: ExtendedError | null) => void
+  ) {
     const fns = this._fns.slice(0);
     if (!fns.length) return fn(null);
 
@@ -102,25 +129,34 @@ export class Namespace extends EventEmitter {
   /**
    * Targets a room when emitting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public to(name: Room): this {
-    this._rooms.add(name);
-    return this;
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).to(room);
   }
 
   /**
    * Targets a room when emitting.
    *
-   * @param name
+   * @param room
    * @return self
    * @public
    */
-  public in(name: Room): this {
-    this._rooms.add(name);
-    return this;
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).in(room);
+  }
+
+  /**
+   * Excludes a room when emitting.
+   *
+   * @param room
+   * @return self
+   * @public
+   */
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).except(room);
   }
 
   /**
@@ -129,7 +165,11 @@ export class Namespace extends EventEmitter {
    * @return {Socket}
    * @private
    */
-  _add(client: Client, query, fn?: () => void): Socket {
+  _add(
+    client: Client<ListenEvents, EmitEvents>,
+    query,
+    fn?: () => void
+  ): Socket<ListenEvents, EmitEvents> {
     debug("adding socket to nsp %s", this.name);
     const socket = new Socket(this, client, query);
     this.run(socket, (err) => {
@@ -157,8 +197,8 @@ export class Namespace extends EventEmitter {
           if (fn) fn();
 
           // fire user-set events
-          super.emit("connect", socket);
-          super.emit("connection", socket);
+          this.emitReserved("connect", socket);
+          this.emitReserved("connection", socket);
         } else {
           debug("next called after client was closed - ignoring socket");
         }
@@ -172,7 +212,7 @@ export class Namespace extends EventEmitter {
    *
    * @private
    */
-  _remove(socket: Socket): void {
+  _remove(socket: Socket<ListenEvents, EmitEvents>): void {
     if (this.sockets.has(socket.id)) {
       this.sockets.delete(socket.id);
     } else {
@@ -186,34 +226,11 @@ export class Namespace extends EventEmitter {
    * @return Always true
    * @public
    */
-  public emit(ev: string | Symbol, ...args: any[]): true {
-    if (RESERVED_EVENTS.has(ev)) {
-      throw new Error(`"${ev}" is a reserved event name`);
-    }
-    // set up packet object
-    args.unshift(ev);
-    const packet = {
-      type: PacketType.EVENT,
-      data: args,
-    };
-
-    if ("function" == typeof args[args.length - 1]) {
-      throw new Error("Callbacks are not supported when broadcasting");
-    }
-
-    const rooms = new Set(this._rooms);
-    const flags = Object.assign({}, this._flags);
-
-    // reset flags
-    this._rooms.clear();
-    this._flags = {};
-
-    this.adapter.broadcast(packet, {
-      rooms: rooms,
-      flags: flags,
-    });
-
-    return true;
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    return new BroadcastOperator<EmitEvents>(this.adapter).emit(ev, ...args);
   }
 
   /**
@@ -222,7 +239,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -233,7 +250,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -245,14 +262,7 @@ export class Namespace extends EventEmitter {
    * @public
    */
   public allSockets(): Promise<Set<SocketId>> {
-    if (!this.adapter) {
-      throw new Error(
-        "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
-      );
-    }
-    const rooms = new Set(this._rooms);
-    this._rooms.clear();
-    return this.adapter.sockets(rooms);
+    return new BroadcastOperator(this.adapter).allSockets();
   }
 
   /**
@@ -262,9 +272,8 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public compress(compress: boolean): this {
-    this._flags.compress = compress;
-    return this;
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).compress(compress);
   }
 
   /**
@@ -275,9 +284,8 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public get volatile(): this {
-    this._flags.volatile = true;
-    return this;
+  public get volatile(): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).volatile;
   }
 
   /**
@@ -286,8 +294,46 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public get local(): this {
-    this._flags.local = true;
-    return this;
+  public get local(): BroadcastOperator<EmitEvents> {
+    return new BroadcastOperator(this.adapter).local;
+  }
+
+  /**
+   * Returns the matching socket instances
+   *
+   * @public
+   */
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+    return new BroadcastOperator(this.adapter).fetchSockets();
+  }
+
+  /**
+   * Makes the matching socket instances join the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsJoin(room: Room | Room[]): void {
+    return new BroadcastOperator(this.adapter).socketsJoin(room);
+  }
+
+  /**
+   * Makes the matching socket instances leave the specified rooms
+   *
+   * @param room
+   * @public
+   */
+  public socketsLeave(room: Room | Room[]): void {
+    return new BroadcastOperator(this.adapter).socketsLeave(room);
+  }
+
+  /**
+   * Makes the matching socket instances disconnect
+   *
+   * @param close - whether to close the underlying connection
+   * @public
+   */
+  public disconnectSockets(close: boolean = false): void {
+    return new BroadcastOperator(this.adapter).disconnectSockets(close);
   }
 }

lib/parent-namespace.ts

@@ -1,11 +1,21 @@
 import { Namespace } from "./namespace";
 import type { Server } from "./index";
+import type {
+  EventParams,
+  EventNames,
+  EventsMap,
+  DefaultEventsMap,
+} from "./typed-events";
+import type { BroadcastOptions } from "socket.io-adapter";
 
-export class ParentNamespace extends Namespace {
+export class ParentNamespace<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends Namespace<ListenEvents, EmitEvents> {
   private static count: number = 0;
-  private children: Set<Namespace> = new Set();
+  private children: Set<Namespace<ListenEvents, EmitEvents>> = new Set();
 
-  constructor(server: Server) {
+  constructor(server: Server<ListenEvents, EmitEvents>) {
     super(server, "/_" + ParentNamespace.count++);
   }
 
@@ -13,29 +23,34 @@ export class ParentNamespace extends Namespace {
    * @private
    */
   _initAdapter(): void {
-    /* no-op */
+    const broadcast = (packet: any, opts: BroadcastOptions) => {
+      this.children.forEach((nsp) => {
+        nsp.adapter.broadcast(packet, opts);
+      });
+    };
+    // @ts-ignore FIXME is there a way to declare an inner class in TypeScript?
+    this.adapter = { broadcast };
   }
 
-  public emit(ev: string | Symbol, ...args: [...any]): true {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
     this.children.forEach((nsp) => {
-      nsp._rooms = this._rooms;
-      nsp._flags = this._flags;
       nsp.emit(ev, ...args);
     });
-    this._rooms.clear();
-    this._flags = {};
 
     return true;
   }
 
-  createChild(name: string): Namespace {
+  createChild(name: string): Namespace<ListenEvents, EmitEvents> {
     const namespace = new Namespace(this.server, name);
     namespace._fns = this._fns.slice(0);
     this.listeners("connect").forEach((listener) =>
-      namespace.on("connect", listener as (...args: any[]) => void)
+      namespace.on("connect", listener)
     );
     this.listeners("connection").forEach((listener) =>
-      namespace.on("connection", listener as (...args: any[]) => void)
+      namespace.on("connection", listener)
     );
     this.children.add(namespace);
     this.server._nsps.set(name, namespace);

lib/socket.ts

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

lib/typed-events.ts

@@ -0,0 +1,179 @@
+import { EventEmitter } from "events";
+
+/**
+ * An events map is an interface that maps event names to their value, which
+ * represents the type of the `on` listener.
+ */
+export interface EventsMap {
+  [event: string]: any;
+}
+
+/**
+ * The default events map, used if no EventsMap is given. Using this EventsMap
+ * is equivalent to accepting all event names, and any data.
+ */
+export interface DefaultEventsMap {
+  [event: string]: (...args: any[]) => void;
+}
+
+/**
+ * Returns a union type containing all the keys of an event map.
+ */
+export type EventNames<Map extends EventsMap> = keyof Map & (string | symbol);
+
+/** The tuple type representing the parameters of an event listener */
+export type EventParams<
+  Map extends EventsMap,
+  Ev extends EventNames<Map>
+> = Parameters<Map[Ev]>;
+
+/**
+ * The event names that are either in ReservedEvents or in UserEvents
+ */
+export type ReservedOrUserEventNames<
+  ReservedEventsMap extends EventsMap,
+  UserEvents extends EventsMap
+> = EventNames<ReservedEventsMap> | EventNames<UserEvents>;
+
+/**
+ * Type of a listener of a user event or a reserved event. If `Ev` is in
+ * `ReservedEvents`, the reserved event listener is returned.
+ */
+export type ReservedOrUserListener<
+  ReservedEvents extends EventsMap,
+  UserEvents extends EventsMap,
+  Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>
+> = FallbackToUntypedListener<
+  Ev extends EventNames<ReservedEvents>
+    ? ReservedEvents[Ev]
+    : Ev extends EventNames<UserEvents>
+    ? UserEvents[Ev]
+    : never
+>;
+
+/**
+ * Returns an untyped listener type if `T` is `never`; otherwise, returns `T`.
+ *
+ * This is a hack to mitigate https://github.com/socketio/socket.io/issues/3833.
+ * Needed because of https://github.com/microsoft/TypeScript/issues/41778
+ */
+type FallbackToUntypedListener<T> = [T] extends [never]
+  ? (...args: any[]) => void
+  : T;
+
+/**
+ * Interface for classes that aren't `EventEmitter`s, but still expose a
+ * strictly typed `emit` method.
+ */
+export interface TypedEventBroadcaster<EmitEvents extends EventsMap> {
+  emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean;
+}
+
+/**
+ * Strictly typed version of an `EventEmitter`. A `TypedEventEmitter` takes type
+ * parameters for mappings of event names to event data types, and strictly
+ * types method calls to the `EventEmitter` according to these event maps.
+ *
+ * @typeParam ListenEvents - `EventsMap` of user-defined events that can be
+ * listened to with `on` or `once`
+ * @typeParam EmitEvents - `EventsMap` of user-defined events that can be
+ * emitted with `emit`
+ * @typeParam ReservedEvents - `EventsMap` of reserved events, that can be
+ * emitted by socket.io with `emitReserved`, and can be listened to with
+ * `listen`.
+ */
+export abstract class StrictEventEmitter<
+    ListenEvents extends EventsMap,
+    EmitEvents extends EventsMap,
+    ReservedEvents extends EventsMap = {}
+  >
+  extends EventEmitter
+  implements TypedEventBroadcaster<EmitEvents> {
+  /**
+   * Adds the `listener` function as an event listener for `ev`.
+   *
+   * @param ev Name of the event
+   * @param listener Callback function
+   */
+  on<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+    ev: Ev,
+    listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
+  ): this {
+    return super.on(ev, listener);
+  }
+
+  /**
+   * Adds a one-time `listener` function as an event listener for `ev`.
+   *
+   * @param ev Name of the event
+   * @param listener Callback function
+   */
+  once<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+    ev: Ev,
+    listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
+  ): this {
+    return super.once(ev, listener);
+  }
+
+  /**
+   * Emits an event.
+   *
+   * @param ev Name of the event
+   * @param args Values to send to listeners of this event
+   */
+  emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    return super.emit(ev, ...args);
+  }
+
+  /**
+   * Emits a reserved event.
+   *
+   * This method is `protected`, so that only a class extending
+   * `StrictEventEmitter` can emit its own reserved events.
+   *
+   * @param ev Reserved event name
+   * @param args Arguments to emit along with the event
+   */
+  protected emitReserved<Ev extends EventNames<ReservedEvents>>(
+    ev: Ev,
+    ...args: EventParams<ReservedEvents, Ev>
+  ): boolean {
+    return super.emit(ev, ...args);
+  }
+
+  /**
+   * Emits an event.
+   *
+   * This method is `protected`, so that only a class extending
+   * `StrictEventEmitter` can get around the strict typing. This is useful for
+   * calling `emit.apply`, which can be called as `emitUntyped.apply`.
+   *
+   * @param ev Event name
+   * @param args Arguments to emit along with the event
+   */
+  protected emitUntyped(ev: string, ...args: any[]): boolean {
+    return super.emit(ev, ...args);
+  }
+
+  /**
+   * Returns the listeners listening to an event.
+   *
+   * @param event Event name
+   * @returns Array of listeners subscribed to `event`
+   */
+  listeners<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+    event: Ev
+  ): ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>[] {
+    return super.listeners(event) as ReservedOrUserListener<
+      ReservedEvents,
+      ListenEvents,
+      Ev
+    >[];
+  }
+}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "socket.io",
-  "version": "3.1.2",
+  "version": "4.0.1",
   "description": "node.js realtime framework server",
   "keywords": [
     "realtime",
@@ -37,7 +37,9 @@
   },
   "scripts": {
     "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",
+    "test": "npm run format:check && npm run compile && npm run test:types && npm run test:unit",
+    "test:types": "tsd",
+    "test:unit": "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"
@@ -49,8 +51,8 @@
     "accepts": "~1.3.4",
     "base64id": "~2.0.0",
     "debug": "~4.3.1",
-    "engine.io": "~4.1.0",
-    "socket.io-adapter": "~2.1.0",
+    "engine.io": "~5.0.0",
+    "socket.io-adapter": "~2.2.0",
     "socket.io-parser": "~4.0.3"
   },
   "devDependencies": {
@@ -63,11 +65,12 @@
     "nyc": "^15.1.0",
     "prettier": "^2.2.0",
     "rimraf": "^3.0.2",
-    "socket.io-client": "3.1.2",
+    "socket.io-client": "4.0.1",
     "socket.io-client-v2": "npm:socket.io-client@^2.4.0",
     "superagent": "^6.1.0",
     "supertest": "^6.0.1",
     "ts-node": "^9.0.0",
+    "tsd": "^0.14.0",
     "typescript": "^4.1.2"
   },
   "contributors": [
@@ -90,5 +93,8 @@
   ],
   "engines": {
     "node": ">=10.0.0"
+  },
+  "tsd": {
+    "directory": "test"
   }
 }

test/socket.io.test-d.ts

@@ -0,0 +1,232 @@
+"use strict";
+import { Server, Socket } from "..";
+import type { DefaultEventsMap } from "../lib/typed-events";
+import { createServer } from "http";
+import { expectError, expectType } from "tsd";
+
+// This file is run by tsd, not mocha.
+
+describe("server", () => {
+  describe("no event map", () => {
+    describe("on", () => {
+      it("infers correct types for listener parameters of reserved events", (done) => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectType<Socket<DefaultEventsMap, DefaultEventsMap>>(s);
+            s.on("disconnect", (reason) => {
+              expectType<string>(reason);
+            });
+            s.on("disconnecting", (reason) => {
+              expectType<string>(reason);
+            });
+          });
+          sio.on("connect", (s) => {
+            expectType<Socket<DefaultEventsMap, DefaultEventsMap>>(s);
+          });
+          done();
+        });
+      });
+
+      it("infers 'any' for listener parameters of other events", (done) => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.on("random", (a, b, c) => {
+              expectType<any>(a);
+              expectType<any>(b);
+              expectType<any>(c);
+              done();
+            });
+            s.emit("random", 1, "2", [3]);
+          });
+        });
+      });
+
+      it("infers 'any' for listener parameters of other events using enums", () => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (socket) => {
+            expectType<Socket<DefaultEventsMap, DefaultEventsMap>>(socket);
+          });
+
+          enum Events {
+            CONNECTION = "connection",
+            TEST = "test",
+          }
+
+          sio.on(Events.CONNECTION, (socket) => {
+            // TODO(#3833): Make this expect `Socket<DefaultEventsMap, DefaultEventsMap>`
+            expectType<any>(socket);
+
+            socket.on("test", (a, b, c) => {
+              expectType<any>(a);
+              expectType<any>(b);
+              expectType<any>(c);
+            });
+
+            socket.on(Events.TEST, (a, b, c) => {
+              expectType<any>(a);
+              expectType<any>(b);
+              expectType<any>(c);
+            });
+          });
+        });
+      });
+    });
+
+    describe("emit", () => {
+      it("accepts any parameters", () => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.emit("random", 1, "2", [3]);
+            s.emit("no parameters");
+          });
+        });
+      });
+    });
+  });
+
+  describe("single event map", () => {
+    interface BidirectionalEvents {
+      random: (a: number, b: string, c: number[]) => void;
+    }
+
+    describe("on", () => {
+      it("infers correct types for listener parameters", (done) => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        expectType<Server<BidirectionalEvents, BidirectionalEvents>>(sio);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectType<Socket<BidirectionalEvents, BidirectionalEvents>>(s);
+            s.on("random", (a, b, c) => {
+              expectType<number>(a);
+              expectType<string>(b);
+              expectType<number[]>(c);
+              done();
+            });
+          });
+        });
+      });
+
+      it("does not accept arguments of wrong types", (done) => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        expectError(sio.on("random", (a, b, c) => {}));
+        srv.listen(() => {
+          expectError(sio.on("wrong name", (s) => {}));
+          sio.on("connection", (s) => {
+            s.on("random", (a, b, c) => {});
+            expectError(s.on("random"));
+            expectError(s.on("random", (a, b, c, d) => {}));
+            expectError(s.on(2, 3));
+          });
+        });
+      });
+    });
+
+    describe("emit", () => {
+      it("accepts arguments of the correct types", () => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.emit("random", 1, "2", [3]);
+          });
+        });
+      });
+
+      it("does not accept arguments of the wrong types", () => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectError(s.emit("noParameter", 2));
+            expectError(s.emit("oneParameter"));
+            expectError(s.emit("random"));
+            expectError(s.emit("oneParameter", 2, 3));
+            expectError(s.emit("random", (a, b, c) => {}));
+            expectError(s.emit("wrong name", () => {}));
+            expectError(s.emit("complicated name with spaces", 2));
+          });
+        });
+      });
+    });
+  });
+
+  describe("listen and emit event maps", () => {
+    interface ClientToServerEvents {
+      helloFromClient: (message: string) => void;
+    }
+
+    interface ServerToClientEvents {
+      helloFromServer: (message: string, x: number) => void;
+    }
+
+    describe("on", () => {
+      it("infers correct types for listener parameters", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        expectType<Server<ClientToServerEvents, ServerToClientEvents>>(sio);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectType<Socket<ClientToServerEvents, ServerToClientEvents>>(s);
+            s.on("helloFromClient", (message) => {
+              expectType<string>(message);
+              done();
+            });
+          });
+        });
+      });
+
+      it("does not accept emit events", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectError(
+              s.on("helloFromServer", (message, number) => {
+                done();
+              })
+            );
+          });
+        });
+      });
+    });
+
+    describe("emit", () => {
+      it("accepts arguments of the correct types", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.emit("helloFromServer", "hi", 10);
+            done();
+          });
+        });
+      });
+
+      it("does not accept arguments of wrong types", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectError(s.emit("helloFromClient", "hi"));
+            expectError(s.emit("helloFromServer", "hi", 10, "10"));
+            expectError(s.emit("helloFromServer", "hi", "10"));
+            expectError(s.emit("helloFromServer", 0, 0));
+            expectError(s.emit("wrong name", 10));
+            expectError(s.emit("wrong name"));
+            done();
+          });
+        });
+      });
+    });
+  });
+});

test/socket.io.ts

@@ -9,13 +9,14 @@ import request from "supertest";
 import expect from "expect.js";
 import type { AddressInfo } from "net";
 import * as io_v2 from "socket.io-client-v2";
-
-const ioc = require("socket.io-client");
+import type { SocketId } from "socket.io-adapter";
+import { io as ioc, Socket as ClientSocket } from "socket.io-client";
 
 import "./support/util";
+import "./utility-methods";
 
 // Creates a socket.io client for the given server
-function client(srv, nsp?: string | object, opts?: object) {
+function client(srv, nsp?: string | object, opts?: object): ClientSocket {
   if ("object" == typeof nsp) {
     opts = nsp;
     nsp = undefined;
@@ -227,7 +228,7 @@ describe("socket.io", () => {
       });
       request
         .options("http://localhost:54013/socket.io/default/")
-        .query({ transport: "polling" })
+        .query({ transport: "polling", EIO: 4 })
         .set("Origin", "http://localhost:54023")
         .end((err, res) => {
           expect(res.status).to.be(204);
@@ -255,7 +256,7 @@ describe("socket.io", () => {
       });
       request
         .get("http://localhost:54014/socket.io/default/")
-        .query({ transport: "polling" })
+        .query({ transport: "polling", EIO: 4 })
         .set("Origin", "http://localhost:54024")
         .end((err, res) => {
           expect(res.status).to.be(200);
@@ -275,7 +276,7 @@ describe("socket.io", () => {
 
       request
         .get("http://localhost:54022/socket.io/default/")
-        .query({ transport: "polling" })
+        .query({ transport: "polling", EIO: 4 })
         .end((err, res) => {
           expect(res.status).to.be(200);
           done();
@@ -289,7 +290,7 @@ describe("socket.io", () => {
       request
         .get("http://localhost:54023/socket.io/default/")
         .set("origin", "http://foo.example")
-        .query({ transport: "polling" })
+        .query({ transport: "polling", EIO: 4 })
         .end((err, res) => {
           expect(res.status).to.be(403);
           done();
@@ -332,7 +333,9 @@ describe("socket.io", () => {
       const net = require("net");
       const server = net.createServer();
 
-      const clientSocket = ioc("ws://0.0.0.0:" + PORT, { reconnection: false });
+      const clientSocket = ioc("ws://0.0.0.0:" + PORT, {
+        reconnection: false,
+      });
 
       clientSocket.on("disconnect", () => {
         expect(Object.keys(sio._nsps["/"].sockets).length).to.equal(0);
@@ -388,10 +391,22 @@ describe("socket.io", () => {
       expect(sio.write).to.be.a("function");
       expect(sio.allSockets).to.be.a("function");
       expect(sio.compress).to.be.a("function");
-      expect(sio.volatile).to.be(sio);
-      expect(sio.local).to.be(sio);
-      expect(sio.sockets._flags).to.eql({ volatile: true, local: true });
-      delete sio.sockets._flags;
+    });
+
+    it("should return an immutable broadcast operator", () => {
+      const sio = new Server();
+      const operator = sio.local.to(["room1", "room2"]).except("room3");
+      operator.compress(true).emit("hello");
+      operator.volatile.emit("hello");
+      operator.to("room4").emit("hello");
+      operator.except("room5").emit("hello");
+      sio.to("room6").emit("hello");
+      // @ts-ignore
+      expect(operator.rooms).to.contain("room1", "room2");
+      // @ts-ignore
+      expect(operator.exceptRooms).to.contain("room3");
+      // @ts-ignore
+      expect(operator.flags).to.eql({ local: true });
     });
 
     it("should automatically connect", (done) => {
@@ -592,7 +607,7 @@ describe("socket.io", () => {
       const srv = createServer();
       const sio = new Server(srv);
       const chatSids: string[] = [];
-      let otherSid = null;
+      let otherSid: SocketId | null = null;
       srv.listen(() => {
         const c1 = client(srv, "/chat");
         const c2 = client(srv, "/chat", { forceNew: true });
@@ -619,9 +634,9 @@ describe("socket.io", () => {
     it("should find all clients in a namespace room", (done) => {
       const srv = createServer();
       const sio = new Server(srv);
-      let chatFooSid = null;
-      let chatBarSid = null;
-      let otherSid = null;
+      let chatFooSid: SocketId | null = null;
+      let chatBarSid: SocketId | null = null;
+      let otherSid: SocketId | null = null;
       srv.listen(() => {
         const c1 = client(srv, "/chat");
         const c2 = client(srv, "/chat", { forceNew: true });
@@ -658,9 +673,9 @@ describe("socket.io", () => {
     it("should find all clients across namespace rooms", (done) => {
       const srv = createServer();
       const sio = new Server(srv);
-      let chatFooSid = null;
-      let chatBarSid = null;
-      let otherSid = null;
+      let chatFooSid: SocketId | null = null;
+      let chatBarSid: SocketId | null = null;
+      let otherSid: SocketId | null = null;
       srv.listen(() => {
         const c1 = client(srv, "/chat");
         const c2 = client(srv, "/chat", { forceNew: true });
@@ -823,6 +838,57 @@ describe("socket.io", () => {
       });
     });
 
+    it("should exclude a specific socket when emitting", (done) => {
+      const srv = createServer();
+      const sio = new Server(srv);
+
+      const nsp = sio.of("/nsp");
+
+      srv.listen(() => {
+        const socket1 = client(srv, "/nsp");
+        const socket2 = client(srv, "/nsp");
+
+        socket2.on("a", () => {
+          done(new Error("not"));
+        });
+        socket1.on("a", () => {
+          done();
+        });
+
+        socket2.on("connect", () => {
+          nsp.except(socket2.id).emit("a");
+        });
+      });
+    });
+
+    it("should exclude a specific room when emitting", (done) => {
+      const srv = createServer();
+      const sio = new Server(srv);
+
+      const nsp = sio.of("/nsp");
+
+      srv.listen(() => {
+        const socket1 = client(srv, "/nsp");
+        const socket2 = client(srv, "/nsp");
+
+        socket1.on("a", () => {
+          done();
+        });
+        socket2.on("a", () => {
+          done(new Error("not"));
+        });
+
+        nsp.on("connection", (socket) => {
+          socket.on("broadcast", () => {
+            socket.join("room1");
+            nsp.except("room1").emit("a");
+          });
+        });
+
+        socket2.emit("broadcast");
+      });
+    });
+
     describe("dynamic namespaces", () => {
       it("should allow connections to dynamic namespaces with a regex", (done) => {
         const srv = createServer();
@@ -889,7 +955,7 @@ describe("socket.io", () => {
       srv.listen(() => {
         const clientSocket = client(srv, { reconnection: false });
         clientSocket.on("connect", function init() {
-          clientSocket.removeListener("connect", init);
+          clientSocket.off("connect", init);
           clientSocket.io.engine.close();
 
           clientSocket.connect();
@@ -978,7 +1044,7 @@ describe("socket.io", () => {
               done();
             });
           });
-          s.client.ondata(null);
+          (s as any).client.ondata(null);
         });
       });
     });
@@ -2166,7 +2232,7 @@ describe("socket.io", () => {
           expect(s.rooms).to.contain(s.id, "a", "b", "c");
           s.leave("b");
           expect(s.rooms).to.contain(s.id, "a", "c");
-          s.leaveAll();
+          (s as any).leaveAll();
           expect(s.rooms.size).to.eql(0);
           done();
         });
@@ -2202,7 +2268,7 @@ describe("socket.io", () => {
           expect(s.rooms).to.contain(s.id, "a", "b");
           s.leave("unknown");
           expect(s.rooms).to.contain(s.id, "a", "b");
-          s.leaveAll();
+          (s as any).leaveAll();
           expect(s.rooms.size).to.eql(0);
           done();
         });
@@ -2222,6 +2288,106 @@ describe("socket.io", () => {
         });
       });
     });
+
+    it("should exclude specific sockets when broadcasting", (done) => {
+      const srv = createServer();
+      const sio = new Server(srv);
+
+      srv.listen(() => {
+        const socket1 = client(srv, { multiplex: false });
+        const socket2 = client(srv, { multiplex: false });
+        const socket3 = client(srv, { multiplex: false });
+
+        socket2.on("a", () => {
+          done(new Error("not"));
+        });
+        socket3.on("a", () => {
+          done(new Error("not"));
+        });
+        socket1.on("a", () => {
+          done();
+        });
+
+        sio.on("connection", (socket) => {
+          socket.on("exclude", (id) => {
+            socket.broadcast.except(id).emit("a");
+          });
+        });
+
+        socket2.on("connect", () => {
+          socket3.emit("exclude", socket2.id);
+        });
+      });
+    });
+
+    it("should exclude a specific room when broadcasting", (done) => {
+      const srv = createServer();
+      const sio = new Server(srv);
+
+      srv.listen(() => {
+        const socket1 = client(srv, { multiplex: false });
+        const socket2 = client(srv, { multiplex: false });
+        const socket3 = client(srv, { multiplex: false });
+
+        socket2.on("a", () => {
+          done(new Error("not"));
+        });
+        socket3.on("a", () => {
+          done(new Error("not"));
+        });
+        socket1.on("a", () => {
+          done();
+        });
+
+        sio.on("connection", (socket) => {
+          socket.on("join", (room, cb) => {
+            socket.join(room);
+            cb();
+          });
+          socket.on("broadcast", () => {
+            socket.broadcast.except("room1").emit("a");
+          });
+        });
+
+        socket2.emit("join", "room1", () => {
+          socket3.emit("broadcast");
+        });
+      });
+    });
+
+    it("should return an immutable broadcast operator", (done) => {
+      const srv = createServer();
+      const sio = new Server(srv);
+
+      srv.listen(() => {
+        const clientSocket = client(srv, { multiplex: false });
+
+        sio.on("connection", (socket: Socket) => {
+          const operator = socket.local
+            .compress(false)
+            .to(["room1", "room2"])
+            .except("room3");
+          operator.compress(true).emit("hello");
+          operator.volatile.emit("hello");
+          operator.to("room4").emit("hello");
+          operator.except("room5").emit("hello");
+          socket.emit("hello");
+          socket.to("room6").emit("hello");
+          // @ts-ignore
+          expect(operator.rooms).to.contain("room1", "room2");
+          // @ts-ignore
+          expect(operator.rooms).to.not.contain("room4", "room5", "room6");
+          // @ts-ignore
+          expect(operator.exceptRooms).to.contain("room3");
+          // @ts-ignore
+          expect(operator.flags).to.eql({ local: true, compress: false });
+
+          clientSocket.close();
+          sio.close();
+          done();
+        });
+      });
+    });
   });
 
   describe("middleware", () => {
@@ -2289,6 +2455,7 @@ describe("socket.io", () => {
         socket.on("connect_error", (err) => {
           expect(err).to.be.an(Error);
           expect(err.message).to.eql("Authentication error");
+          // @ts-ignore
           expect(err.data).to.eql({ a: "b", c: 3 });
           done();
         });
@@ -2305,7 +2472,7 @@ describe("socket.io", () => {
       srv.listen(() => {
         const socket = client(srv);
         sio.on("connection", (socket) => {
-          expect(socket.name).to.be("guillermo");
+          expect((socket as any).name).to.be("guillermo");
           done();
         });
       });

test/utility-methods.ts

@@ -0,0 +1,176 @@
+import { createServer } from "http";
+import { Server, Socket } from "..";
+import { io as ioc, Socket as ClientSocket } from "socket.io-client";
+import { Adapter, BroadcastOptions } from "socket.io-adapter";
+import expect from "expect.js";
+import type { AddressInfo } from "net";
+
+import "./support/util";
+
+const SOCKETS_COUNT = 3;
+
+const createPartialDone = (
+  count: number,
+  done: () => void,
+  callback?: () => void
+) => {
+  let i = 0;
+  return () => {
+    i++;
+    if (i === count) {
+      done();
+      if (callback) {
+        callback();
+      }
+    }
+  };
+};
+
+class DummyAdapter extends Adapter {
+  fetchSockets(opts: BroadcastOptions): Promise<any[]> {
+    return Promise.resolve([
+      {
+        id: "42",
+        handshake: {
+          headers: {
+            accept: "*/*",
+          },
+          query: {
+            transport: "polling",
+            EIO: "4",
+          },
+        },
+        rooms: ["42", "room1"],
+        data: {
+          username: "john",
+        },
+      },
+    ]);
+  }
+}
+
+describe("socket.io", () => {
+  let io: Server, clientSockets: ClientSocket[], serverSockets: Socket[];
+  beforeEach((done) => {
+    const srv = createServer();
+    io = new Server(srv);
+    srv.listen(() => {
+      const port = (srv.address() as AddressInfo).port;
+
+      clientSockets = [];
+      for (let i = 0; i < SOCKETS_COUNT; i++) {
+        clientSockets.push(ioc(`http://localhost:${port}`));
+      }
+
+      serverSockets = [];
+      io.on("connection", (socket: Socket) => {
+        serverSockets.push(socket);
+        if (serverSockets.length === SOCKETS_COUNT) {
+          done();
+        }
+      });
+    });
+  });
+
+  afterEach(() => {
+    io.close();
+    clientSockets.forEach((socket) => socket.disconnect());
+  });
+
+  describe("utility methods", () => {
+    describe("fetchSockets", () => {
+      it("returns all socket instances", async () => {
+        const sockets = await io.fetchSockets();
+        expect(sockets.length).to.eql(3);
+      });
+
+      it("returns all socket instances in the given room", async () => {
+        serverSockets[0].join(["room1", "room2"]);
+        serverSockets[1].join("room1");
+        serverSockets[2].join("room2");
+        const sockets = await io.in("room1").fetchSockets();
+        expect(sockets.length).to.eql(2);
+      });
+
+      it("works with a custom adapter", async () => {
+        io.adapter(DummyAdapter);
+        const sockets = await io.fetchSockets();
+        expect(sockets.length).to.eql(1);
+        const remoteSocket = sockets[0];
+        expect(remoteSocket.id).to.eql("42");
+        expect(remoteSocket.rooms).to.contain("42", "room1");
+        expect(remoteSocket.data).to.eql({ username: "john" });
+      });
+    });
+
+    describe("socketsJoin", () => {
+      it("makes all socket instances join the given room", () => {
+        io.socketsJoin("room1");
+        serverSockets.forEach((socket) => {
+          expect(socket.rooms).to.contain("room1");
+        });
+      });
+
+      it("makes all socket instances in a room join the given room", () => {
+        serverSockets[0].join(["room1", "room2"]);
+        serverSockets[1].join("room1");
+        serverSockets[2].join("room2");
+        io.in("room1").socketsJoin("room3");
+        expect(serverSockets[0].rooms).to.contain("room3");
+        expect(serverSockets[1].rooms).to.contain("room3");
+        expect(serverSockets[2].rooms).to.not.contain("room3");
+      });
+    });
+
+    describe("socketsLeave", () => {
+      it("makes all socket instances leave the given room", () => {
+        serverSockets[0].join(["room1", "room2"]);
+        serverSockets[1].join("room1");
+        serverSockets[2].join("room2");
+        io.socketsLeave("room1");
+        expect(serverSockets[0].rooms).to.contain("room2");
+        expect(serverSockets[0].rooms).to.not.contain("room1");
+        expect(serverSockets[1].rooms).to.not.contain("room1");
+      });
+
+      it("makes all socket instances in a room leave the given room", () => {
+        serverSockets[0].join(["room1", "room2"]);
+        serverSockets[1].join("room1");
+        serverSockets[2].join("room2");
+        io.in("room2").socketsLeave("room1");
+        expect(serverSockets[0].rooms).to.contain("room2");
+        expect(serverSockets[0].rooms).to.not.contain("room1");
+        expect(serverSockets[1].rooms).to.contain("room1");
+      });
+    });
+
+    describe("disconnectSockets", () => {
+      it("makes all socket instances disconnect", (done) => {
+        io.disconnectSockets(true);
+
+        const partialDone = createPartialDone(3, done);
+
+        clientSockets[0].on("disconnect", partialDone);
+        clientSockets[1].on("disconnect", partialDone);
+        clientSockets[2].on("disconnect", partialDone);
+      });
+
+      it("makes all socket instances in a room disconnect", (done) => {
+        serverSockets[0].join(["room1", "room2"]);
+        serverSockets[1].join("room1");
+        serverSockets[2].join("room2");
+        io.in("room2").disconnectSockets(true);
+
+        const partialDone = createPartialDone(2, done, () => {
+          clientSockets[1].off("disconnect");
+        });
+
+        clientSockets[0].on("disconnect", partialDone);
+        clientSockets[1].on("disconnect", () => {
+          done(new Error("should not happen"));
+        });
+        clientSockets[2].on("disconnect", partialDone);
+      });
+    });
+  });
+});