index.js

require("dotenv").config(); //* npm install dotenv

const Discord = require("discord.js"); //* npm install discord.js
const fs = require("fs");

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 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.login(process.env.token);