Hi,  Currently I'm using v3 version:   
const Steam = require('steam-client');
const SteamUser = require('steam-user');
const SteamCommunity = require('steamcommunity');
const TradeOfferManager = require('steam-tradeoffer-manager');
let client = new Steam.CMClient();
client.setHttpProxy(proxyUrl);
let user = new SteamUser(client, {
	debug: true,
	singleSentryfile: false,
	autoRelogin: true,
	dataDirectory: '/files/clients'
});
let community = new SteamCommunity();
let manager = new TradeOfferManager({
	steam: user,
	community: community
});
And in v4 I should change to:    
const SteamUser = require('steam-user');
const SteamCommunity = require('steamcommunity');
const TradeOfferManager = require('steam-tradeoffer-manager');
let user = new SteamUser({
	debug: true,
	singleSentryfile: false,
	autoRelogin: true,
	dataDirectory: '/files/clients'
});
user.setHttpProxy(proxyUrl);
let community = new SteamCommunity();
let manager = new TradeOfferManager({
	steam: user,
	community: community
});
Can you advice please?  NOTE: so v4 node-user replaces steam-client?