Add utils.inherits. Make User inherit EventEmitter.

utils.inherits is the Node.js impl but with the addition of a polyfill for
Object.create().

lib/client.js

@@ -33,9 +33,6 @@ function MatrixClient(opts) {
         ["baseUrl", "request", "accessToken", "userId", "store"]
     );
 
-    // super call
-    EventEmitter.call(this);
-
     this.store = opts.store || new MatrixInMemoryStore();
     // track our position in the overall eventstream
     this.fromToken = undefined;
@@ -53,16 +50,7 @@ function MatrixClient(opts) {
     };
     this._http = new httpApi.MatrixHttpApi(httpOpts);
 }
-// inherit from EventEmitter (not with ECMA5 Object.prototype for compat with IE8)
+utils.inherits(MatrixClient, EventEmitter);
-// See MDN for this shim impl.
-function createObject(proto) {
-    function Ctor() { }
-    Ctor.prototype = proto;
-    return new Ctor();
-}
-MatrixClient.prototype = createObject(EventEmitter.prototype);
-/** */
-MatrixClient.constructor = module.exports.MatrixClient;
 
 /**
  * Get the data store for this client.
@@ -848,7 +836,7 @@ MatrixClient.prototype.startClient = function(historyLen) {
                 return new MatrixEvent(event);
             };
             utils.forEach(utils.map(data.presence, eventMapper), function(e) {
-                var user = new User(e.getContent().user_id);
+                var user = createNewUser(self, e.getContent().user_id);
                 user.setPresenceEvent(e);
                 self.store.storeUser(user);
             });
@@ -977,6 +965,21 @@ MatrixClient.prototype.stopClient = function() {
     // TODO: f.e. Room => self.store.storeRoom(room) ?
 };
 
+
+function reEmit(reEmitEntity, emittableEntity, eventNames) {
+    utils.forEach(eventNames, function(eventName) {
+        emittableEntity.on(eventName, function() {
+            reEmitEntity.emit(eventName, arguments);
+        });
+    });
+}
+
+function createNewUser(client, userId) {
+    var user = new User(userId);
+    reEmit(client, user, ["User.avatarUrl", "User.displayName", "User.presence"]);
+    return user;
+}
+
 /** */
 module.exports.MatrixClient = MatrixClient;
 

lib/models/user.js

@@ -2,6 +2,8 @@
 /**
  * @module models/user
  */
+ var EventEmitter = require("events").EventEmitter;
+ var utils = require("../utils");
 
 /**
  * Construct a new User. A User must have an ID and can optionally have extra
@@ -22,6 +24,7 @@ function User(userId) {
     this.avatarUrl = null;
     this.lastActiveAgo = 0;
 }
+utils.inherits(User, EventEmitter);
 
 /**
  * Update this User with the given presence event. May fire "User.presence",

lib/utils.js

@@ -157,3 +157,95 @@ module.exports.checkObjectHasNoAdditionalKeys = function(obj, allowedKeys) {
         }
     }
 };
+
+/**
+ * Inherit the prototype methods from one constructor into another. This is a
+ * port of the Node.js implementation with an Object.create polyfill.
+ *
+ * @param {function} ctor Constructor function which needs to inherit the
+ *     prototype.
+ * @param {function} superCtor Constructor function to inherit prototype from.
+ */
+module.exports.inherits = function(ctor, superCtor) {
+    // Add Object.create polyfill for IE8
+    // Source:
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript
+    // /Reference/Global_Objects/Object/create#Polyfill
+    if (typeof Object.create != 'function') {
+      // Production steps of ECMA-262, Edition 5, 15.2.3.5
+      // Reference: http://es5.github.io/#x15.2.3.5
+      Object.create = (function() {
+        // To save on memory, use a shared constructor
+        function Temp() {}
+
+        // make a safe reference to Object.prototype.hasOwnProperty
+        var hasOwn = Object.prototype.hasOwnProperty;
+
+        return function(O) {
+          // 1. If Type(O) is not Object or Null throw a TypeError exception.
+          if (typeof O != 'object') {
+            throw new TypeError('Object prototype may only be an Object or null');
+          }
+
+          // 2. Let obj be the result of creating a new object as if by the
+          //    expression new Object() where Object is the standard built-in
+          //    constructor with that name
+          // 3. Set the [[Prototype]] internal property of obj to O.
+          Temp.prototype = O;
+          var obj = new Temp();
+          Temp.prototype = null; // Let's not keep a stray reference to O...
+
+          // 4. If the argument Properties is present and not undefined, add
+          //    own properties to obj as if by calling the standard built-in
+          //    function Object.defineProperties with arguments obj and
+          //    Properties.
+          if (arguments.length > 1) {
+            // Object.defineProperties does ToObject on its first argument.
+            var Properties = Object(arguments[1]);
+            for (var prop in Properties) {
+              if (hasOwn.call(Properties, prop)) {
+                obj[prop] = Properties[prop];
+              }
+            }
+          }
+
+          // 5. Return obj
+          return obj;
+        };
+      })();
+    }
+    // END polyfill
+
+    // Add util.inherits from Node.js
+    // Source:
+    // https://github.com/joyent/node/blob/master/lib/util.js
+    // Copyright Joyent, Inc. and other Node contributors.
+    //
+    // Permission is hereby granted, free of charge, to any person obtaining a
+    // copy of this software and associated documentation files (the
+    // "Software"), to deal in the Software without restriction, including
+    // without limitation the rights to use, copy, modify, merge, publish,
+    // distribute, sublicense, and/or sell copies of the Software, and to permit
+    // persons to whom the Software is furnished to do so, subject to the
+    // following conditions:
+    //
+    // The above copyright notice and this permission notice shall be included
+    // in all copies or substantial portions of the Software.
+    //
+    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+    // USE OR OTHER DEALINGS IN THE SOFTWARE.
+    ctor.super_ = superCtor;
+    ctor.prototype = Object.create(superCtor.prototype, {
+        constructor: {
+            value: ctor,
+            enumerable: false,
+            writable: true,
+            configurable: true
+        }
+    });
+};