index.js

const Discord = require('discord.js');
const fs = require('fs');
const { prefix, token } = require('./config/config.json');

const client = new Discord.Client({
  partials: ["MESSAGE", "CHANNEL", "REACTION"]
});

client.commands = new Discord.Collection();
client.aliases = new Discord.Collection();

// Command Handler
const commandFolders = fs.readdirSync('./commands');
for (const folder of commandFolders) {
  const commandFiles = fs.readdirSync(`./commands/${folder}`).filter(file => file.endsWith('.js'));
  for (const file of commandFiles) {
    const command = require(`./commands/${folder}/${file}`);
    client.commands.set(command.name, command);
    if (command.aliases) {
      command.aliases.forEach(alias => client.aliases.set(alias, command.name));
    }
  }
}

// Event Handler
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(token);