server.js

var LOGIN = "";
var PASSWORD = "";

'use strict';
var SteamUser = require('steam-user');
var Winston = require('winston');
var fs = require('fs');

var logger = new Winston.Logger({
    transports: [
        new Winston.transports.Console({
            colorize: true,
            level: 'debug'
        }),
        new Winston.transports.File({
            level: 'info',
            timestamp: true,
            filename: 'chat.log',
            json: false
        })
    ]
});

var client = new SteamUser();

client.logOn({
    accountName: LOGIN,
    password: PASSWORD
});

client.on('loggedOn', (details) => {
    console.log('logged in!');
});

client.on('webSession', ()=> {
    client.joinChat('103582791456573856');
});

client.on('friendOrChatMessage#76561198011442932', (sender, message, room) => {
    logger.info(`Bug: ${message}`
});