index.js

const { Client, GatewayIntentBits, Collection, Events } = require('discord.js');
const path = require('path');
const fs = require('fs');
const { token } = require('./config.json')

const client = new Client({
    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMembers]
});

client.commands = new Collection();

const eventsPath = path.join(__dirname, 'events') // events folder
const eventFiles = fs.readdirSync(eventsPath).filter(file => file.endsWith(".js")) // get all files in events folder
const commandsPath = path.join(__dirname, 'commands')
const commandFiles = fs.readdirSync(commandsPath).filter(file => file.endsWith(".js"));

for (const file of eventFiles){
    const filePath = path.join(eventsPath, file);
    const event = require(filePath);
    if(event.once){
        client.once(event.name, (...args) => event.execute(...args));
    } else {
        client.on(event.name, (...args) => event.execute(...args));
    }
}

for (const file of commandFiles){
    const filePath = path.join(commandsPath, file);
    const command = require(filePath);
    client.commands.set(command.data.name, command);
}

client.on(Events.InteractionCreate, async interaction => {
    if(!interaction.isChatInputCommand()) return;

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

    if(!command) return;

    try {
        await command.execute(interaction);
    } catch (error) {
        console.error(error);
        await interaction.reply({content: 'Ha ocurrido un error', ephemeral: true})
    }

})

client.login(token);