server.js

require('dotenv').config()

const fs = require('fs');
const Discord = require("discord.js");

const client = new Discord.Client();
client.commands = new Discord.Collection();

const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));

for (const file of commandFiles) {
	const command = require(`./commands/${file}`);
	client.commands.set(command.name, command);
}

const prefix = "!";
client.on("message", function(message) { 
    if (message.author.bot) return;
    if (!message.content.startsWith(prefix)) return;
    
    const commandBody = message.content.slice(prefix.length);
    const args = commandBody.split(' ');
    const commandName = args.shift().toLowerCase();

    if (!client.commands.has(commandName)) return;

    const command = client.commands.get(commandName);

	try {
		command.execute(message, args);
	} catch (error) {
		console.error(error);
		message.reply('An error occurred while executing a command!');
	}
});

const eventFiles = fs.readdirSync('./events').filter(file => file.endsWith('.js'));

for (const file of eventFiles) {
	const event = require(`./events/${file}`);
	if (event.once) {
		client.once(event.name, (...args) => event.execute(...args, client));
	} else {
		client.on(event.name, (...args) => event.execute(...args, client));
	}
}

client.on("ready", function(message) { 
    console.log(
	`Started in ${client.guilds.cache.size} servers.`
	);
});

client.login(process.env.BOT_TOKEN);