index.js

const commando = require('discord.js-commando');
const discord = require('discord.js');
const config = require('./config.json');
const path = require('path');
const bot = new commando.Client({
    owner: config.owner,
    commandPrefix: 'xd//'
});

bot.on("ready", () => {
	bot.user.setPresence({
    	status: "online",
    	game: {
    		name: "developing myself",
    		type: "LISTENING"
    	}
    });
    console.log(`**Bot ready. ${bot.guilds.size} servers, ${bot.channels.size} channels, ${bot.users.size} users.**`);
});

bot.on("error", (e) => console.error(e));
bot.on("warn", (e) => console.warn(e));
// bot.on("debug", (e) => console.info(e));

bot.registry.registerGroups([
	['useful', 'Useful'],
    ['random', 'Random'],
    ['xendric', 'Xendric']
]).registerDefaults().registerCommandsIn(path.join(__dirname, 'commands'));

bot.on("messageUpdate", async(oldMsg, newMsg) =>{
	if(oldMsg.content === newMsg.content) return;

	let logEmbed = new discord.RichEmbed();
	logEmbed.setAuthor(oldMsg.author.tag, oldMsg.author.avatarUrl);
	logEmbed.setThumbnail(oldMsg.author.avatarUrl);
	logEmbed.setColor(0x007fed);
	logEmbed.setDescription("Message from a user was updated.");
	logEmbed.addField("Before", oldMsg.content, true);
	logEmbed.addField("After", newMsg.content, true);
	logEmbed.setTimestamp();
	logEmbed.setFooter("Embed for message updates");

	let loggingChannel = newMsg.guild.channels.find(ch => ch.name === "dev-bot-testing");
	if(!loggingChannel) return;

	loggingChannel.send(logEmbed);
});

bot.login(config.token);