Add io socket message to share user position.

- Add message 'user-position' to share position in a room.
 - Change JoinRoomMessage to MessageUserPosition to have all data to share position and user information
 - Fix error alias to build

back/src/Model/Websocket/JoinRoomMessage.ts

@@ -1,23 +0,0 @@
-export class JoinRoomMessage {
-    userId: string;
-    roomId: string;
-    positionXUser: string;
-    positionYUser: string;
-
-    constructor(message: string) {
-        let data = JSON.parse(message);
-        this.userId = data.userId;
-        this.roomId = data.roomId;
-        this.positionXUser = data.positionXUser;
-        this.positionYUser = data.positionYUser;
-    }
-
-    toString(){
-        return JSON.stringify({
-            userId: this.userId,
-            roomId: this.roomId,
-            positionXUser: this.positionXUser,
-            positionYUser: this.positionYUser
-        })
-    }
-}

back/src/Model/Websocket/Message.ts

@@ -0,0 +1,17 @@
+export class Message {
+    userId: string;
+    roomId: string;
+
+    constructor(message: string) {
+        let data = JSON.parse(message);
+        this.userId = data.userId;
+        this.roomId = data.roomId;
+    }
+
+    toJson() {
+        return {
+            userId: this.userId,
+            roomId: this.roomId,
+        }
+    }
+}

back/src/Model/Websocket/MessageUserPosition.ts

@@ -0,0 +1,24 @@
+import {Message} from "./Message";
+
+export class MessageUserPosition extends Message{
+    positionXUser: string;
+    positionYUser: string;
+
+    constructor(message: string) {
+        super(message);
+        let data = JSON.parse(message);
+        this.positionXUser = data.positionXUser;
+        this.positionYUser = data.positionYUser;
+    }
+
+    toString() {
+        return JSON.stringify(
+            Object.assign(
+                super.toJson(),
+                {
+                    positionXUser: this.positionXUser,
+                    positionYUser: this.positionYUser
+                })
+        );
+    }
+}