diff --git a/src/actions/index.js b/src/actions/index.js
index b3186ca..acdb97f 100644
--- a/src/actions/index.js
+++ b/src/actions/index.js
@@ -362,14 +362,14 @@ export function receiveCoolDown(
  * draw pixel on canvas
  * @param i, j, offset Chunk and offset in chunk
  * @param color integer Color Index
- * @param notify Bool if pixel notification appears (false when my own pixel)
+ * @param notifyPxl Bool if pixel notification appears (false when my own pixel)
  */
 export function updatePixel(
   i,
   j,
   offset,
   color,
-  notify = true,
+  notifyPxl = true,
 ) {
   return {
     type: 'UPDATE_PIXEL',
@@ -377,7 +377,7 @@ export function updatePixel(
     j,
     offset,
     color,
-    notify,
+    notify: notifyPxl,
   };
 }
 
diff --git a/src/components/CanvasItem.jsx b/src/components/CanvasItem.jsx
index 7b41479..45af014 100644
--- a/src/components/CanvasItem.jsx
+++ b/src/components/CanvasItem.jsx
@@ -41,7 +41,10 @@ const CanvasItem = ({
       {t`Stacking till`}: 
       <span className="modalinfo"> {canvas.cds / 1000}s</span><br />
       {t`Ranked`}:&nbsp;
-      <span className="modalinfo">{(canvas.ranked) ? t`Yes` : t`No`}</span><br />
+      <span className="modalinfo">{
+        (canvas.ranked) ? t`Yes` : t`No`
+      }
+      </span><br />
       {(canvas.req !== -1) ? <span>{t`Requirements`}:<br /></span> : null}
       <span className="modalinfo">
         {(canvas.req !== -1) ? <span>{t`User Account`} </span> : null}
diff --git a/src/components/OnlineBox.jsx b/src/components/OnlineBox.jsx
index e870f7f..894d984 100644
--- a/src/components/OnlineBox.jsx
+++ b/src/components/OnlineBox.jsx
@@ -28,8 +28,6 @@ const OnlineBox = () => {
   ], shallowEqual);
   const dispatch = useDispatch();
 
-  const onlineUsers = (onlineCanvas) ? online[canvasId] : online.total;
-
   return (
     <div
       className="onlinebox"
@@ -51,15 +49,14 @@ const OnlineBox = () => {
           >
             {online.total}<FaUser />
           </span>
-        )
-      }
+        )}
        &nbsp;
       {(name != null)
           && (
           <span title={t`Pixels placed`}>
             {numberToString(totalPixels)} <FaPaintBrush />
           </span>
-      )}
+          )}
     </div>
   );
 };
diff --git a/src/core/Void.js b/src/core/Void.js
index 9663b36..2266ddb 100644
--- a/src/core/Void.js
+++ b/src/core/Void.js
@@ -4,7 +4,6 @@
  * users fight it with background pixels
  * if it reaches the TARGET_RADIUS size, the event is lost
  *
- * @flow
  */
 import socketEvents from '../socket/SocketEvents';
 import PixelUpdate from '../socket/packets/PixelUpdateServer';
@@ -19,17 +18,24 @@ const EVENT_DURATION_MIN = 10;
 // const EVENT_DURATION_MIN = 1;
 
 class Void {
-  i: number;
-  j: number;
-  maxClr: number;
-  msTimeout: number;
-  pixelStack: Array;
-  area: Object;
-  userArea: Object;
-  curRadius: number;
-  curAngle: number;
-  curAngleDelta: number;
-  ended: boolean;
+  // chunk coords
+  i;
+  j;
+  // number highest possible colorIndex
+  maxClr;
+  // timeout between pixels in ms
+  msTimeout;
+  // array of pixels that we place before continue building (instant-defense)
+  pixelStack;
+  // Uint8Array to log pixels in area
+  area;
+  userArea;
+  // current numberical data
+  curRadius;
+  curAngle;
+  curAngleDelta;
+  // boolean if ended
+  ended;
 
   constructor(centerCell) {
     // chunk coordinates
@@ -39,16 +45,13 @@ class Void {
     this.ended = false;
     this.maxClr = canvases[CANVAS_ID].colors.length;
     const area = TARGET_RADIUS ** 2 * Math.PI;
-    const online = socketEvents.onlineCounter;
+    const online = socketEvents.onlineCounter.total || 0;
     // require an average of 0.25 px / min / user
     const requiredSpeed = Math.floor(online / 1.8);
     const ppm = Math.ceil(area / EVENT_DURATION_MIN + requiredSpeed);
-    // timeout between pixels
     this.msTimeout = 60 * 1000 / ppm;
-    // area where we log placed pixels
     this.area = new Uint8Array(TILE_SIZE * 3 * TILE_SIZE * 3);
     this.userArea = new Uint8Array(TILE_SIZE * 3 * TILE_SIZE * 3);
-    // array of pixels that we place before continue building (instant-defense)
     this.pixelStack = [];
     this.curRadius = 0;
     this.curAngle = 0;
diff --git a/src/socket/SocketEvents.js b/src/socket/SocketEvents.js
index c28753a..e6fde4a 100644
--- a/src/socket/SocketEvents.js
+++ b/src/socket/SocketEvents.js
@@ -1,5 +1,4 @@
-/* @flow
- *
+/*
  * Events for WebSockets
  */
 import EventEmitter from 'events';
@@ -13,31 +12,34 @@ class SocketEvents extends EventEmitter {
     super();
     /*
      * {
+     *   total: totalUsersOnline,
      *  canvasId: onlineUsers,
      *  ...
      *  }
      */
-    this.onlineCounter = {};
+    this.onlineCounter = {
+      total: 0,
+    };
   }
 
   /*
    * broadcast message via websocket
-   * @param message Message to send
+   * @param message Buffer Message to send
    */
-  broadcast(message: Buffer) {
+  broadcast(message) {
     this.emit('broadcast', message);
   }
 
   /*
    * broadcast pixel message via websocket
-   * @param canvasId ident of canvas
-   * @param chunkid id consisting of i,j chunk coordinates
+   * @param canvasId number ident of canvas
+   * @param chunkid number id consisting of i,j chunk coordinates
    * @param pxls buffer with offset and color of one or more pixels
    */
   broadcastPixels(
-    canvasId: number,
-    chunkId: number,
-    pixels: Buffer,
+    canvasId,
+    chunkId,
+    pixels,
   ) {
     const buffer = PixelUpdate.dehydrate(chunkId, pixels);
     this.emit('pixelUpdate', canvasId, chunkId, buffer);
@@ -50,9 +52,9 @@ class SocketEvents extends EventEmitter {
    * @param channelId numerical channel id
    */
   recvChatMessage(
-    user: Object,
-    message: string,
-    channelId: number,
+    user,
+    message,
+    channelId,
   ) {
     this.emit('recvChatMessage', user, message, channelId);
   }
@@ -65,12 +67,12 @@ class SocketEvents extends EventEmitter {
    *                (usefull if the api is supposed to not answer to its own messages)
    */
   broadcastChatMessage(
-    name: string,
-    message: string,
-    channelId: number,
-    id: number,
-    country: string = 'xx',
-    sendapi: boolean = true,
+    name,
+    message,
+    channelId,
+    id,
+    country = 'xx',
+    sendapi = true,
   ) {
     this.emit(
       'chatMessage',
@@ -87,12 +89,12 @@ class SocketEvents extends EventEmitter {
    * send chat message to a single user in channel
    */
   broadcastSUChatMessage(
-    targetUserId: number,
-    name: string,
-    message: string,
-    channelId: number,
-    id: number,
-    country: string = 'xx',
+    targetUserId,
+    name,
+    message,
+    channelId,
+    id,
+    country = 'xx',
   ) {
     this.emit(
       'suChatMessage',
@@ -112,9 +114,9 @@ class SocketEvents extends EventEmitter {
    * @param channelArray array with channel info [name, type, lastTs]
    */
   broadcastAddChatChannel(
-    userId: number,
-    channelId: number,
-    channelArray: Array,
+    userId,
+    channelId,
+    channelArray,
   ) {
     this.emit(
       'addChatChannel',
@@ -131,8 +133,8 @@ class SocketEvents extends EventEmitter {
    *        (i.e. false if the user already gets it via api response)
    */
   broadcastRemoveChatChannel(
-    userId: number,
-    channelId: number,
+    userId,
+    channelId,
   ) {
     this.emit('remChatChannel', userId, channelId);
   }
@@ -140,15 +142,16 @@ class SocketEvents extends EventEmitter {
   /*
    * reload user on websocket to get changes
    */
-  reloadUser(name: string) {
+  reloadUser(name) {
     this.emit('reloadUser', name);
   }
 
   /*
    * broadcast online counter
-   * @param online Number of users online
+   * @param online Object of total and canvas online users
+   *   (see this.onlineCounter)
    */
-  broadcastOnlineCounter(online: number) {
+  broadcastOnlineCounter(online) {
     this.onlineCounter = online;
     const buffer = OnlineCounter.dehydrate(online);
     this.emit('broadcast', buffer);
diff --git a/src/socket/SocketServer.js b/src/socket/SocketServer.js
index f486b6a..d519e00 100644
--- a/src/socket/SocketServer.js
+++ b/src/socket/SocketServer.js
@@ -4,6 +4,7 @@
 import WebSocket from 'ws';
 
 import logger from '../core/logger';
+// eslint-disable-next-line import/no-unresolved
 import canvases from './canvases.json';
 import Counter from '../utils/Counter';
 import { getIPFromRequest } from '../utils/ip';