const SteamUser = require('steam-user');
const client = new SteamUser();

var logOnOptions = {
  accountName: "username",
  password: "password"
};

client.logOn(logOnOptions);

client.on('loggedOn', () => {
    console.log('Logged on.');
    client.setPersona(SteamUser.Steam.EPersonaState.Online);
    client.gamesPlayed([730]);
});