JavaScript
//lib
var express = require('express')
var app = express();
var chokidar = require('chokidar');
var fs = require('fs');
var server = require ('http').Server(app);
var io = require('socket.io')(server);
var filepath = require('path');

let clients = {};

var watcher = chikidar.watch('./***/',{
    ignored:/[/\]./,
    persistent:true,
    alwaysStat:true,
    }
});

app.get('/',req,res)=>{
   res.SendFile(__dirname + './***.html');
});

io.on('connection',(socket)=>{
    clients[socket.id]= socket;
    watcher.on('add',function(path){
///file read only so I omit it.
    io.json.to(socket.id).emit(～～～);
});// watcher
socket.on('event1',function(data){
    console.log('event1')。
});
socket.on('disconnect',(reason)=>{
     delete clients;
});
});

io.on('connection',(socket)=>{
    var info = io.sockets.client();
    var count = Oblect.keys(info.connected).length
    console.log(info); //console1
    console.log(count); //console2
    clients[socket.id]= socket;
    watcher.on('add',function(path){
    ・・・