Upgrading ESLint and adding some more rules. Refactoring to meet these new rules

web/react/components/msg_typing.jsx

@@ -74,11 +74,12 @@ export default class MsgTyping extends React.Component {
         case 1:
             text = users[0] + ' is typing...';
             break;
-        default:
+        default: {
             const last = users.pop();
             text = users.join(', ') + ' and ' + last + ' are typing...';
             break;
         }
+        }
 
         this.setState({text});
     }