server.js

'use strict';

const _ = require('lodash');
const Discord = require('discord.js');
const client = new Discord.Client();
const http = require('http');
const express = require('express');
const Bluebird = require('bluebird');
const mongoose = require('mongoose');

const commandList = require('./commands/index');
const guildController = require('./modules/guild/controllers/index');

const app = express();
const DEFAULT_PREFIX = process.env.PREFIX;

Bluebird.promisifyAll(mongoose);

//keep alive glitch method
app.get('/', (request, response) => {
  console.log(Date.now() + ' Ping Received');
  response.sendStatus(200);
});
app.listen(process.env.PORT);
setInterval(() => {
  http.get(`http://${process.env.PROJECT_DOMAIN}.glitch.me/`);
}, 280000);

client.on('ready', () => {
  console.log(`logged in as ${client.user.tag}`);
});

client.on('message', async (message) => {
  if (message.author.bot) return;
  if (!message.guild) return;

  const guildFound = await guildController.findById(message.guild.id);
  const prefix = _.get(guildFound, '[0].prefix', DEFAULT_PREFIX);

  if (message.content === '!prefix') {
    return message.channel.send(`Prefix for this channel is: \`${prefix}\``);
  }
  if (message.content.indexOf(prefix) !== 0) return;

  const args = message.content.slice(prefix.length).trim().split(/ +/g);
  const command = args.shift().toLowerCase();
  const commandFileObject = _.find(commandList(), { command: command });
  const commandFile = commandFileObject ? commandFileObject.fileName : '';

  // The list of if/else is replaced with those simple 2 lines:
  try {
    let commandRequired = require(`./commands/${commandFile}`);
    if (commandRequired.length <= 0) {
      const embedError = new Discord.MessageEmbed()
        .addField('I can\'t find command ', command)
        .setColor('RED');
      return message.channel.send(embedError);
    }
    await commandRequired.run(client, message, args).catch(async (err) => {
      console.log(err);
      const embedError = new Discord.MessageEmbed()
        .addField('I can\'t find command ', command)
        .setColor('RED');
      await message.channel.send(embedError);
    });
  } catch (err) {
    console.log(err);
    const embedError = new Discord.MessageEmbed()
      .addField('I can\'t find command ', command)
      .setColor('RED');
    await message.channel.send(embedError);
  }
});

client.on('voiceStateUpdate', (oldState, newState) => {
  if (newState.channelID === 'idChannelX') {
    newState.setChannel('idChannelY', 'just move 4Head');
  }
});

client.login(process.env.token);