diff --git a/README.md b/README.md
index 9ed3bea1..d71c3f0b 100644
--- a/README.md
+++ b/README.md
@@ -96,3 +96,6 @@ Vagrant destroy
 * `Vagrant ssh`: connect on your VM Vagrant.
 * `Vagrant halt`: stop your VM Vagrant.
 * `Vagrant destroy`: delete your VM Vagrant.
+
+## Features developed
+You have more details of features developed in back [README.md](./back/README.md).
\ No newline at end of file
diff --git a/back/README.md b/back/README.md
new file mode 100644
index 00000000..8a78f403
--- /dev/null
+++ b/back/README.md
@@ -0,0 +1,61 @@
+# Back Features
+
+## Login
+To start your game, you must authenticate on the server back.
+When you are authenticated, the back server return token and room starting.
+```
+POST => /login 
+Params : 
+    email: email of user.
+```
+
+## Join a room
+When a user is connected, the user can join a room.
+So you must send emit `join-room` with information user:
+```
+Socket.io => 'join-room'
+
+    userId: user id of gamer
+    roomId: room id when user enter in game
+    position: {
+        x: position x on map
+        y: position y on map
+    }
+```
+All data users are stocked on socket client.
+
+## Send position user
+When user move on the map, you can share new position on back with event  `user-position`.
+The information sent:
+```
+Socket.io => 'user-position'
+
+    userId: user id of gamer
+    roomId: room id when user enter in game
+    position: {
+        x: position x on map
+        y: position y on map
+    }
+```
+All data users are updated on socket client.
+
+## Receive positions of all users
+The application sends position of all users in each room in every few 10 milliseconds.
+The data will pushed on event `user-position`:
+```
+Socket.io => 'user-position'
+
+    [
+        {
+            userId: user id of gamer
+            roomId: room id when user enter in game
+            position: {
+                x: position x on map
+                y: position y on map
+            }
+        },
+        ...
+    ]
+```
+
+[<<< back](../README.md) 
\ No newline at end of file
diff --git a/back/src/App.ts b/back/src/App.ts
index e46f4cb3..4b3b3c53 100644
--- a/back/src/App.ts
+++ b/back/src/App.ts
@@ -1,8 +1,8 @@
 // lib/app.ts
-import {IoSocketController} from "./Controller/IoSocketController"; //TODO fix impot by "_Controller/..."
-import {AuthenticateController} from "./Controller/AuthenticateController"; //TODO fix impot by "_Controller/..."
+import {IoSocketController} from "./Controller/IoSocketController"; //TODO fix import by "_Controller/..."
+import {AuthenticateController} from "./Controller/AuthenticateController"; //TODO fix import by "_Controller/..."
 import express from "express";
-import {Application} from 'express';
+import {Application, Request, Response} from 'express';
 import bodyParser = require('body-parser');
 import * as http from "http";
 
@@ -28,6 +28,11 @@ class App {
     private config(): void {
         this.app.use(bodyParser.json());
         this.app.use(bodyParser.urlencoded({extended: false}));
+        this.app.use(function (req: Request, res: Response, next) {
+            res.header("Access-Control-Allow-Origin", "*"); // update to match the domain you will make the request from
+            res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
+            next();
+        });
     }
 }
 
diff --git a/back/src/Controller/AuthenticateController.ts b/back/src/Controller/AuthenticateController.ts
index 01985b6a..7555c67a 100644
--- a/back/src/Controller/AuthenticateController.ts
+++ b/back/src/Controller/AuthenticateController.ts
@@ -1,7 +1,7 @@
 import {Application, Request, Response} from "express";
-import Jwt, {JsonWebTokenError} from "jsonwebtoken";
+import Jwt from "jsonwebtoken";
 import {BAD_REQUEST, OK} from "http-status-codes";
-import {SECRET_KEY} from "../Enum/EnvironmentVariable";
+import {SECRET_KEY, ROOM} from "../Enum/EnvironmentVariable"; //TODO fix import by "_Enum/..."
 
 export class AuthenticateController{
     App : Application;
@@ -21,8 +21,8 @@ export class AuthenticateController{
                 });
             }
             //TODO check user email for The Coding Machine game
-            let token = Jwt.sign({email: param.email}, SECRET_KEY, {expiresIn: '24h'});
-            return res.status(OK).send({token: token});
+            let token = Jwt.sign({email: param.email, roomId: ROOM}, SECRET_KEY, {expiresIn: '24h'});
+            return res.status(OK).send({token: token, roomId: ROOM});
         });
     }
 }
\ No newline at end of file
diff --git a/back/src/Controller/IoSocketController.ts b/back/src/Controller/IoSocketController.ts
index 3907436b..aa5dfdc9 100644
--- a/back/src/Controller/IoSocketController.ts
+++ b/back/src/Controller/IoSocketController.ts
@@ -5,6 +5,8 @@ import {MessageUserPosition} from "../Model/Websocket/MessageUserPosition"; //TO
 import {ExSocketInterface} from "../Model/Websocket/ExSocketInterface"; //TODO fix import by "_Model/.."
 import Jwt, {JsonWebTokenError} from "jsonwebtoken";
 import {SECRET_KEY} from "../Enum/EnvironmentVariable"; //TODO fix import by "_Enum/..."
+import {ExtRooms, RefreshUserPositionFunction} from "../Model/Websocket/ExtRoom";
+import {ExtRoomsInterface} from "_Model/Websocket/ExtRoomsInterface";
 
 export class IoSocketController{
     Io: socketIO.Server;
@@ -26,6 +28,7 @@ export class IoSocketController{
         });
 
         this.ioConnection();
+        this.shareUsersPosition();
     }
 
     ioConnection() {
@@ -38,34 +41,47 @@ export class IoSocketController{
                         x: user x position on map
                         y: user y position on map
             */
-
             socket.on('join-room', (message : string) => {
                 let messageUserPosition = this.hydrateMessageReceive(message);
                 if(messageUserPosition instanceof Error){
                     return socket.emit("message-error", JSON.stringify({message: messageUserPosition.message}))
                 }
+
                 //join user in room
                 socket.join(messageUserPosition.roomId);
+
                 // sending to all clients in room except sender
-                this.saveUserPosition((socket as ExSocketInterface), messageUserPosition);
+                this.saveUserInformation((socket as ExSocketInterface), messageUserPosition);
+
+                //add function to refresh position user in real time.
+                let rooms = (this.Io.sockets.adapter.rooms as ExtRoomsInterface);
+                rooms.refreshUserPosition = RefreshUserPositionFunction;
+                rooms.refreshUserPosition(rooms, this.Io);
+
                 socket.to(messageUserPosition.roomId).emit('join-room', messageUserPosition.toString());
             });
 
             socket.on('user-position', (message : string) => {
                 let messageUserPosition = this.hydrateMessageReceive(message);
-                if(messageUserPosition instanceof Error){
+                if (messageUserPosition instanceof Error) {
                     return socket.emit("message-error", JSON.stringify({message: messageUserPosition.message}));
                 }
+
                 // sending to all clients in room except sender
-                this.saveUserPosition((socket as ExSocketInterface), messageUserPosition);
-                socket.to(messageUserPosition.roomId).emit('join-room', messageUserPosition.toString());
+                this.saveUserInformation((socket as ExSocketInterface), messageUserPosition);
+
+                //refresh position of all user in all rooms in real time
+                let rooms = (this.Io.sockets.adapter.rooms as ExtRoomsInterface)
+                rooms.refreshUserPosition(rooms, this.Io);
             });
         });
     }
 
     //permit to save user position in socket
-    saveUserPosition(socket : ExSocketInterface, message : MessageUserPosition){
+    saveUserInformation(socket : ExSocketInterface, message : MessageUserPosition){
         socket.position = message.position;
+        socket.roomId = message.roomId;
+        socket.userId = message.userId;
     }
 
     //Hydrate and manage error
@@ -77,4 +93,42 @@ export class IoSocketController{
             return new Error(err);
         }
     }
+
+    /** permit to share user position
+        ** users position will send in event 'user-position'
+        ** The data sent is an array with information for each user :
+        [
+          {
+            userId: <string>,
+            roomId: <string>,
+            position: {
+                x : <number>,
+                y : <number>
+            }
+          },
+          ...
+        ]
+     **/
+    seTimeOutInProgress : any = null;
+    shareUsersPosition(){
+        if(this.seTimeOutInProgress){
+            clearTimeout(this.seTimeOutInProgress);
+        }
+        //send for each room, all data of position user
+        let arrayMap = (this.Io.sockets.adapter.rooms as ExtRooms).userPositionMapByRoom;
+        if(!arrayMap){
+            this.seTimeOutInProgress = setTimeout(() => {
+                this.shareUsersPosition();
+            }, 10);
+            return;
+        }
+        arrayMap.forEach((value : any) => {
+            let roomId = value[0];
+            let data = value[1];
+            this.Io.in(roomId).emit('user-position', JSON.stringify(data));
+        });
+        this.seTimeOutInProgress = setTimeout(() => {
+            this.shareUsersPosition();
+        }, 10);
+    }
 }
diff --git a/back/src/Enum/EnvironmentVariable.ts b/back/src/Enum/EnvironmentVariable.ts
index 27f56d78..f795bf90 100644
--- a/back/src/Enum/EnvironmentVariable.ts
+++ b/back/src/Enum/EnvironmentVariable.ts
@@ -1,5 +1,7 @@
 const SECRET_KEY = process.env.SECRET_KEY || "THECODINGMACHINE_SECRET_KEY";
+const ROOM = process.env.ROOM || "THECODINGMACHINE";
 
 export {
-    SECRET_KEY
+    SECRET_KEY,
+    ROOM
 }
\ No newline at end of file
diff --git a/back/src/Model/Websocket/ExSocketInterface.ts b/back/src/Model/Websocket/ExSocketInterface.ts
index 51df9258..095d3cbc 100644
--- a/back/src/Model/Websocket/ExSocketInterface.ts
+++ b/back/src/Model/Websocket/ExSocketInterface.ts
@@ -2,6 +2,8 @@ import {Socket} from "socket.io";
 import {PointInterface} from "./PointInterface";
 
 export interface ExSocketInterface extends Socket {
-    token: object;
+    token: any;
+    roomId: string;
+    userId: string;
     position: PointInterface;
 }
\ No newline at end of file
diff --git a/back/src/Model/Websocket/ExtRoom.ts b/back/src/Model/Websocket/ExtRoom.ts
new file mode 100644
index 00000000..03eb5e33
--- /dev/null
+++ b/back/src/Model/Websocket/ExtRoom.ts
@@ -0,0 +1,42 @@
+import {ExtRoomsInterface} from "./ExtRoomsInterface";
+import socketIO = require('socket.io');
+import {ExSocketInterface} from "_Model/Websocket/ExSocketInterface";
+
+export class ExtRooms implements ExtRoomsInterface{
+    userPositionMapByRoom: any;
+    refreshUserPosition: any;
+
+    [room: string]: SocketIO.Room;
+}
+
+let RefreshUserPositionFunction = function(rooms : ExtRooms, Io: socketIO.Server){
+    let clients = Io.clients();
+    let socketsKey = Object.keys(Io.clients().sockets);
+
+    //create mapping with all users in all rooms
+    let mapPositionUserByRoom = new Map();
+    for(let i = 0; i < socketsKey.length; i++){
+        let socket = clients.sockets[socketsKey[i]];
+        if(!(socket as ExSocketInterface).position){
+            continue;
+        }
+        let data = {
+            userId : (socket as ExSocketInterface).userId,
+            roomId : (socket as ExSocketInterface).roomId,
+            position : (socket as ExSocketInterface).position,
+        };
+        let dataArray = <any>[];
+        if(mapPositionUserByRoom.get(data.roomId)){
+            dataArray = mapPositionUserByRoom.get(data.roomId);
+            dataArray.push(data);
+        }else{
+            dataArray = [data];
+        }
+        mapPositionUserByRoom.set(data.roomId, dataArray);
+    }
+    rooms.userPositionMapByRoom = Array.from(mapPositionUserByRoom);
+}
+
+export {
+    RefreshUserPositionFunction
+}
\ No newline at end of file
diff --git a/back/src/Model/Websocket/ExtRoomsInterface.ts b/back/src/Model/Websocket/ExtRoomsInterface.ts
new file mode 100644
index 00000000..a71fcbf9
--- /dev/null
+++ b/back/src/Model/Websocket/ExtRoomsInterface.ts
@@ -0,0 +1,6 @@
+import {Rooms} from "socket.io";
+
+export interface ExtRoomsInterface extends Rooms{
+    userPositionMapByRoom: any;
+    refreshUserPosition: any;
+}
\ No newline at end of file
diff --git a/back/src/Model/Websocket/MessageUserPosition.ts b/back/src/Model/Websocket/MessageUserPosition.ts
index 731d60ff..493f1457 100644
--- a/back/src/Model/Websocket/MessageUserPosition.ts
+++ b/back/src/Model/Websocket/MessageUserPosition.ts
@@ -6,7 +6,7 @@ export class Point implements PointInterface{
     y: number;
 
     constructor(x : number, y : number) {
-        if(!x || !y){
+        if(x === null || y === null){
             throw Error("position x and y cannot be null");
         }
         this.x = x;
@@ -22,7 +22,7 @@ export class Point implements PointInterface{
 }
 
 export class MessageUserPosition extends Message{
-    position: PointInterface
+    position: PointInterface;
 
     constructor(message: string) {
         super(message);
diff --git a/back/tsconfig.json b/back/tsconfig.json
index 2fefad63..7686fb67 100644
--- a/back/tsconfig.json
+++ b/back/tsconfig.json
@@ -44,7 +44,8 @@
     "baseUrl": ".",                           /* Base directory to resolve non-absolute module names. */
     "paths": {
       "_Controller/*": ["src/Controller/*"],
-      "_Model/*": ["src/Model/*"]
+      "_Model/*": ["src/Model/*"],
+      "_Enum/*": ["src/Enum/*"]
     },                                        /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
     // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
     // "typeRoots": [],                       /* List of folders to include type definitions from. */
diff --git a/front/package.json b/front/package.json
index dae1eb8c..25d613e6 100644
--- a/front/package.json
+++ b/front/package.json
@@ -14,7 +14,10 @@
     "webpack-dev-server": "^3.10.3"
   },
   "dependencies": {
-    "phaser": "^3.22.0"
+    "@types/axios": "^0.14.0",
+    "@types/socket.io-client": "^1.4.32",
+    "phaser": "^3.22.0",
+    "socket.io-client": "^2.3.0"
   },
   "scripts": {
     "start": "webpack-dev-server --open",
diff --git a/front/src/Connexion.ts b/front/src/Connexion.ts
new file mode 100644
index 00000000..4f094152
--- /dev/null
+++ b/front/src/Connexion.ts
@@ -0,0 +1,148 @@
+const SocketIo = require('socket.io-client');
+import Axios from "axios";
+import {API_URL} from "./Enum/EnvironmentVariable";
+
+export interface PointInterface {
+    x: number;
+    y: number;
+    toJson() : object;
+}
+
+export class Message {
+    userId: string;
+    roomId: string;
+
+    constructor(userId : string, roomId : string) {
+        this.userId = userId;
+        this.roomId = roomId;
+    }
+
+    toJson() {
+        return {
+            userId: this.userId,
+            roomId: this.roomId,
+        }
+    }
+}
+
+export class Point implements PointInterface{
+    x: number;
+    y: number;
+
+    constructor(x : number, y : number) {
+        if(x  === null || y === null){
+            throw Error("position x and y cannot be null");
+        }
+        this.x = x;
+        this.y = y;
+    }
+
+    toJson(){
+        return {
+            x : this.x,
+            y: this.y
+        }
+    }
+}
+
+export class MessageUserPosition extends Message{
+    position: PointInterface;
+
+    constructor(userId : string, roomId : string, point : Point) {
+        super(userId, roomId);
+        this.position = point;
+    }
+
+    toString() {
+        return JSON.stringify(
+            Object.assign(
+                super.toJson(),
+                {
+                    position: this.position.toJson()
+                })
+        );
+    }
+}
+
+export class Connexion {
+    socket : any;
+    token : string;
+    email : string;
+    startedRoom : string;
+
+    constructor(email : string) {
+        this.email = email;
+        Axios.post(`${API_URL}/login`, {email: email})
+            .then((res) => {
+                this.token = res.data.token;
+                this.startedRoom = res.data.roomId;
+
+                this.socket = SocketIo(`${API_URL}`, {
+                    query: {
+                        token: this.token
+                    }
+                });
+
+                //join the room
+                this.joinARoom(this.startedRoom);
+
+                //share your first position
+                this.sharePosition(0, 0);
+
+                //create listen event to get all data user shared by the back
+                this.positionOfAllUser();
+
+                this.errorMessage();
+            })
+            .catch((err) => {
+                console.error(err);
+                throw err;
+            });
+    }
+
+    /**
+     * Permit to join a room
+     * @param roomId
+     */
+    joinARoom(roomId : string){
+        let messageUserPosition = new MessageUserPosition(this.email, this.startedRoom, new Point(0, 0));
+        this.socket.emit('join-room', messageUserPosition.toString());
+    }
+
+    /**
+     * Permit to share your position in map
+     * @param x
+     * @param y
+     */
+    sharePosition(x : number, y : number){
+        let messageUserPosition = new MessageUserPosition(this.email, this.startedRoom, new Point(x, y));
+        this.socket.emit('user-position', messageUserPosition.toString());
+    }
+
+    /**
+     * The data sent is an array with information for each user :
+     * [
+     * {
+     *       userId: <string>,
+     *       roomId: <string>,
+     *       position: {
+     *           x : <number>,
+     *           y : <number>
+     *       }
+     *     },
+     * ...
+     * ]
+     **/
+    positionOfAllUser(){
+        this.socket.on("user-position", (message : string) => {
+            //TODO show all user in map
+            console.info("user-position", message);
+        });
+    }
+
+    errorMessage(){
+        this.socket.on('message-error', (message : string) => {
+            console.error("message-error", message);
+        })
+    }
+}
\ No newline at end of file
diff --git a/front/src/Enum/EnvironmentVariable.ts b/front/src/Enum/EnvironmentVariable.ts
new file mode 100644
index 00000000..0e10e789
--- /dev/null
+++ b/front/src/Enum/EnvironmentVariable.ts
@@ -0,0 +1,5 @@
+const API_URL = process.env.API_URL || "http://api.workadventure.localhost";
+
+export {
+    API_URL
+}
\ No newline at end of file
diff --git a/front/src/index.ts b/front/src/index.ts
index 9038a9c7..9c7c0e8a 100644
--- a/front/src/index.ts
+++ b/front/src/index.ts
@@ -1,6 +1,7 @@
 import 'phaser';
 import GameConfig = Phaser.Types.Core.GameConfig;
 import {GameScene} from "./GameScene";
+import {Connexion} from "./Connexion";
 
 const resolution = 2;
 
@@ -18,3 +19,5 @@ let game = new Phaser.Game(config);
 window.addEventListener('resize', function (event) {
     game.scale.resize(window.innerWidth / resolution, window.innerHeight / resolution);
 });
+
+const connexion = new Connexion("test@gmail.com");
diff --git a/front/yarn.lock b/front/yarn.lock
index e2ec8385..c9b34f3f 100644
--- a/front/yarn.lock
+++ b/front/yarn.lock
@@ -23,6 +23,13 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
+"@types/axios@^0.14.0":
+  version "0.14.0"
+  resolved "https://registry.yarnpkg.com/@types/axios/-/axios-0.14.0.tgz#ec2300fbe7d7dddd7eb9d3abf87999964cafce46"
+  integrity sha1-7CMA++fX3d1+udOr+HmZlkyvzkY=
+  dependencies:
+    axios "*"
+
 "@types/color-name@^1.1.1":
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
@@ -58,6 +65,11 @@
   version "13.11.0"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-13.11.0.tgz#390ea202539c61c8fa6ba4428b57e05bc36dc47b"
 
+"@types/socket.io-client@^1.4.32":
+  version "1.4.32"
+  resolved "https://registry.yarnpkg.com/@types/socket.io-client/-/socket.io-client-1.4.32.tgz#988a65a0386c274b1c22a55377fab6a30789ac14"
+  integrity sha512-Vs55Kq8F+OWvy1RLA31rT+cAyemzgm0EWNeax6BWF8H7QiiOYMJIdcwSDdm5LVgfEkoepsWkS+40+WNb7BUMbg==
+
 "@typescript-eslint/eslint-plugin@^2.26.0":
   version "2.26.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.26.0.tgz#04c96560c8981421e5a9caad8394192363cc423f"
@@ -257,6 +269,11 @@ acorn@^7.1.1:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.1.tgz#e35668de0b402f359de515c5482a1ab9f89a69bf"
   integrity sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==
 
+after@0.8.2:
+  version "0.8.2"
+  resolved "https://registry.yarnpkg.com/after/-/after-0.8.2.tgz#fedb394f9f0e02aa9768e702bda23b505fae7e1f"
+  integrity sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=
+
 ajv-errors@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/ajv-errors/-/ajv-errors-1.0.1.tgz#f35986aceb91afadec4102fbd85014950cefa64d"
@@ -372,6 +389,11 @@ array-unique@^0.3.2:
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.3.2.tgz#a894b75d4bc4f6cd679ef3244a9fd8f46ae2d428"
 
+arraybuffer.slice@~0.0.7:
+  version "0.0.7"
+  resolved "https://registry.yarnpkg.com/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz#3bbc4275dd584cc1b10809b89d4e8b63a69e7675"
+  integrity sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog==
+
 asn1.js@^4.0.0:
   version "4.10.1"
   resolved "https://registry.yarnpkg.com/asn1.js/-/asn1.js-4.10.1.tgz#b9c2bf5805f1e64aadeed6df3a2bfafb5a73f5a0"
@@ -414,10 +436,27 @@ atob@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
 
+axios@*:
+  version "0.19.2"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.19.2.tgz#3ea36c5d8818d0d5f8a8a97a6d36b86cdc00cb27"
+  integrity sha512-fjgm5MvRHLhx+osE2xoekY70AhARk3a6hkN+3Io1jc00jtquGvxYlKlsFUhmUET0V5te6CcZI7lcv2Ym61mjHA==
+  dependencies:
+    follow-redirects "1.5.10"
+
+backo2@1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/backo2/-/backo2-1.0.2.tgz#31ab1ac8b129363463e35b3ebb69f4dfcfba7947"
+  integrity sha1-MasayLEpNjRj41s+u2n038+6eUc=
+
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
 
+base64-arraybuffer@0.1.5:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/base64-arraybuffer/-/base64-arraybuffer-0.1.5.tgz#73926771923b5a19747ad666aa5cd4bf9c6e9ce8"
+  integrity sha1-c5JncZI7Whl0etZmqlzUv5xunOg=
+
 base64-js@^1.0.2:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.3.1.tgz#58ece8cb75dd07e71ed08c736abc5fac4dbf8df1"
@@ -438,6 +477,13 @@ batch@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/batch/-/batch-0.6.1.tgz#dc34314f4e679318093fc760272525f94bf25c16"
 
+better-assert@~1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/better-assert/-/better-assert-1.0.2.tgz#40866b9e1b9e0b55b481894311e68faffaebc522"
+  integrity sha1-QIZrnhueC1W0gYlDEeaPr/rrxSI=
+  dependencies:
+    callsite "1.0.0"
+
 big.js@^5.2.2:
   version "5.2.2"
   resolved "https://registry.yarnpkg.com/big.js/-/big.js-5.2.2.tgz#65f0af382f578bcdc742bd9c281e9cb2d7768328"
@@ -452,6 +498,11 @@ bindings@^1.5.0:
   dependencies:
     file-uri-to-path "1.0.0"
 
+blob@0.0.5:
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/blob/-/blob-0.0.5.tgz#d680eeef25f8cd91ad533f5b01eed48e64caf683"
+  integrity sha512-gaqbzQPqOoamawKg0LGVd7SzLgXS+JH61oWprSLH+P+abTczqJbhTR8CmJ2u9/bUYNmHTGJx/UEmn6doAvvuig==
+
 bluebird@^3.5.5:
   version "3.7.2"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.7.2.tgz#9f229c15be272454ffa973ace0dbee79a1b0c36f"
@@ -637,6 +688,11 @@ cache-base@^1.0.1:
     union-value "^1.0.0"
     unset-value "^1.0.0"
 
+callsite@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/callsite/-/callsite-1.0.0.tgz#280398e5d664bd74038b6f0905153e6e8af1bc20"
+  integrity sha1-KAOY5dZkvXQDi28JBRU+borxvCA=
+
 callsites@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73"
@@ -780,10 +836,25 @@ commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
 
+component-bind@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/component-bind/-/component-bind-1.0.0.tgz#00c608ab7dcd93897c0009651b1d3a8e1e73bbd1"
+  integrity sha1-AMYIq33Nk4l8AAllGx06jh5zu9E=
+
+component-emitter@1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.2.1.tgz#137918d6d78283f7df7a6b7c5a63e140e69425e6"
+  integrity sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=
+
 component-emitter@^1.2.1:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.3.0.tgz#16e4070fba8ae29b679f2215853ee181ab2eabc0"
 
+component-inherit@0.0.3:
+  version "0.0.3"
+  resolved "https://registry.yarnpkg.com/component-inherit/-/component-inherit-0.0.3.tgz#645fc4adf58b72b649d5cae65135619db26ff143"
+  integrity sha1-ZF/ErfWLcrZJ1crmUTVhnbJv8UM=
+
 compressible@~2.0.16:
   version "2.0.18"
   resolved "https://registry.yarnpkg.com/compressible/-/compressible-2.0.18.tgz#af53cca6b070d4c3c0750fbd77286a6d7cc46fba"
@@ -928,13 +999,20 @@ debug@2.6.9, debug@^2.2.0, debug@^2.3.3:
   dependencies:
     ms "2.0.0"
 
+debug@=3.1.0, debug@~3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
+  integrity sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==
+  dependencies:
+    ms "2.0.0"
+
 debug@^3.0.0, debug@^3.1.1, debug@^3.2.5:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
   dependencies:
     ms "^2.1.1"
 
-debug@^4.0.1, debug@^4.1.0, debug@^4.1.1:
+debug@^4.0.1, debug@^4.1.0, debug@^4.1.1, debug@~4.1.0:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
   dependencies:
@@ -1119,6 +1197,34 @@ end-of-stream@^1.0.0, end-of-stream@^1.1.0:
   dependencies:
     once "^1.4.0"
 
+engine.io-client@~3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/engine.io-client/-/engine.io-client-3.4.0.tgz#82a642b42862a9b3f7a188f41776b2deab643700"
+  integrity sha512-a4J5QO2k99CM2a0b12IznnyQndoEvtA4UAldhGzKqnHf42I3Qs2W5SPnDvatZRcMaNZs4IevVicBPayxYt6FwA==
+  dependencies:
+    component-emitter "1.2.1"
+    component-inherit "0.0.3"
+    debug "~4.1.0"
+    engine.io-parser "~2.2.0"
+    has-cors "1.1.0"
+    indexof "0.0.1"
+    parseqs "0.0.5"
+    parseuri "0.0.5"
+    ws "~6.1.0"
+    xmlhttprequest-ssl "~1.5.4"
+    yeast "0.1.2"
+
+engine.io-parser@~2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/engine.io-parser/-/engine.io-parser-2.2.0.tgz#312c4894f57d52a02b420868da7b5c1c84af80ed"
+  integrity sha512-6I3qD9iUxotsC5HEMuuGsKA0cXerGz+4uGcXQEkfBidgKf0amsjrrtwcbwK/nzpZBxclXlV7gGl9dgWvu4LF6w==
+  dependencies:
+    after "0.8.2"
+    arraybuffer.slice "~0.0.7"
+    base64-arraybuffer "0.1.5"
+    blob "0.0.5"
+    has-binary2 "~1.0.2"
+
 enhanced-resolve@4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-4.1.0.tgz#41c7e0bfdfe74ac1ffe1e57ad6a5c6c9f3742a7f"
@@ -1545,6 +1651,13 @@ flush-write-stream@^1.0.0:
     inherits "^2.0.3"
     readable-stream "^2.3.6"
 
+follow-redirects@1.5.10:
+  version "1.5.10"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.5.10.tgz#7b7a9f9aea2fdff36786a94ff643ed07f4ff5e2a"
+  integrity sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==
+  dependencies:
+    debug "=3.1.0"
+
 follow-redirects@^1.0.0:
   version "1.11.0"
   resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.11.0.tgz#afa14f08ba12a52963140fe43212658897bc0ecb"
@@ -1705,6 +1818,18 @@ handle-thing@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/handle-thing/-/handle-thing-2.0.1.tgz#857f79ce359580c340d43081cc648970d0bb234e"
 
+has-binary2@~1.0.2:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/has-binary2/-/has-binary2-1.0.3.tgz#7776ac627f3ea77250cfc332dab7ddf5e4f5d11d"
+  integrity sha512-G1LWKhDSvhGeAQ8mPVQlqNcOB2sJdwATtZKl2pDKKHfpf/rYj24lkinxf69blJbnsvtqqNU+L3SL50vzZhXOnw==
+  dependencies:
+    isarray "2.0.1"
+
+has-cors@1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/has-cors/-/has-cors-1.1.0.tgz#5e474793f7ea9843d1bb99c23eef49ff126fff39"
+  integrity sha1-XkdHk/fqmEPRu5nCPu9J/xJv/zk=
+
 has-flag@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
@@ -1895,6 +2020,11 @@ imurmurhash@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/imurmurhash/-/imurmurhash-0.1.4.tgz#9218b9b2b928a238b13dc4fb6b6d576f231453ea"
 
+indexof@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/indexof/-/indexof-0.0.1.tgz#82dc336d232b9062179d05ab3293a66059fd435d"
+  integrity sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10=
+
 infer-owner@^1.0.3:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/infer-owner/-/infer-owner-1.0.4.tgz#c4cefcaa8e51051c2a40ba2ce8a3d27295af9467"
@@ -2140,6 +2270,11 @@ isarray@1.0.0, isarray@^1.0.0, isarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
 
+isarray@2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/isarray/-/isarray-2.0.1.tgz#a37d94ed9cda2d59865c9f76fe596ee1f338741e"
+  integrity sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4=
+
 isexe@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
@@ -2566,6 +2701,11 @@ object-assign@^4.0.1, object-assign@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
 
+object-component@0.0.3:
+  version "0.0.3"
+  resolved "https://registry.yarnpkg.com/object-component/-/object-component-0.0.3.tgz#f0c69aa50efc95b866c186f400a33769cb2f1291"
+  integrity sha1-8MaapQ78lbhmwYb0AKM3acsvEpE=
+
 object-copy@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/object-copy/-/object-copy-0.1.0.tgz#7e7d858b781bd7c991a41ba975ed3812754e998c"
@@ -2747,6 +2887,20 @@ parse-passwd@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/parse-passwd/-/parse-passwd-1.0.0.tgz#6d5b934a456993b23d37f40a382d6f1666a8e5c6"
 
+parseqs@0.0.5:
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/parseqs/-/parseqs-0.0.5.tgz#d5208a3738e46766e291ba2ea173684921a8b89d"
+  integrity sha1-1SCKNzjkZ2bikbouoXNoSSGouJ0=
+  dependencies:
+    better-assert "~1.0.0"
+
+parseuri@0.0.5:
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/parseuri/-/parseuri-0.0.5.tgz#80204a50d4dbb779bfdc6ebe2778d90e4bce320a"
+  integrity sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=
+  dependencies:
+    better-assert "~1.0.0"
+
 parseurl@~1.3.2, parseurl@~1.3.3:
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/parseurl/-/parseurl-1.3.3.tgz#9da19e7bee8d12dff0513ed5b76957793bc2e8d4"
@@ -3300,6 +3454,35 @@ snapdragon@^0.8.1:
     source-map-resolve "^0.5.0"
     use "^3.1.0"
 
+socket.io-client@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/socket.io-client/-/socket.io-client-2.3.0.tgz#14d5ba2e00b9bcd145ae443ab96b3f86cbcc1bb4"
+  integrity sha512-cEQQf24gET3rfhxZ2jJ5xzAOo/xhZwK+mOqtGRg5IowZsMgwvHwnf/mCRapAAkadhM26y+iydgwsXGObBB5ZdA==
+  dependencies:
+    backo2 "1.0.2"
+    base64-arraybuffer "0.1.5"
+    component-bind "1.0.0"
+    component-emitter "1.2.1"
+    debug "~4.1.0"
+    engine.io-client "~3.4.0"
+    has-binary2 "~1.0.2"
+    has-cors "1.1.0"
+    indexof "0.0.1"
+    object-component "0.0.3"
+    parseqs "0.0.5"
+    parseuri "0.0.5"
+    socket.io-parser "~3.3.0"
+    to-array "0.1.4"
+
+socket.io-parser@~3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/socket.io-parser/-/socket.io-parser-3.3.0.tgz#2b52a96a509fdf31440ba40fed6094c7d4f1262f"
+  integrity sha512-hczmV6bDgdaEbVqhAeVMM/jfUfzuEZHsQg6eOmLgJht6G3mPKMxYm75w2+qhAQZ+4X+1+ATZ+QFKeOZD5riHng==
+  dependencies:
+    component-emitter "1.2.1"
+    debug "~3.1.0"
+    isarray "2.0.1"
+
 sockjs-client@1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/sockjs-client/-/sockjs-client-1.4.0.tgz#c9f2568e19c8fd8173b4997ea3420e0bb306c7d5"
@@ -3629,6 +3812,11 @@ tmp@^0.0.33:
   dependencies:
     os-tmpdir "~1.0.2"
 
+to-array@0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/to-array/-/to-array-0.1.4.tgz#17e6c11f73dd4f3d74cda7a4ff3238e9ad9bf890"
+  integrity sha1-F+bBH3PdTz10zaek/zI46a2b+JA=
+
 to-arraybuffer@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz#7d229b1fcc637e466ca081180836a7aabff83f43"
@@ -4018,6 +4206,18 @@ ws@^6.2.1:
   dependencies:
     async-limiter "~1.0.0"
 
+ws@~6.1.0:
+  version "6.1.4"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-6.1.4.tgz#5b5c8800afab925e94ccb29d153c8d02c1776ef9"
+  integrity sha512-eqZfL+NE/YQc1/ZynhojeV8q+H050oR8AZ2uIev7RU10svA9ZnJUddHcOUZTJLinZ9yEfdA2kSATS2qZK5fhJA==
+  dependencies:
+    async-limiter "~1.0.0"
+
+xmlhttprequest-ssl@~1.5.4:
+  version "1.5.5"
+  resolved "https://registry.yarnpkg.com/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz#c2876b06168aadc40e57d97e81191ac8f4398b3e"
+  integrity sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4=
+
 xtend@^4.0.0, xtend@~4.0.1:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
@@ -4076,3 +4276,8 @@ yargs@13.2.4:
     which-module "^2.0.0"
     y18n "^4.0.0"
     yargs-parser "^13.1.0"
+
+yeast@0.1.2:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/yeast/-/yeast-0.1.2.tgz#008e06d8094320c372dbc2f8ed76a0ca6c8ac419"
+  integrity sha1-AI4G2AlDIMNy28L47XagymyKxBk=