index.js

const dotenv = require('dotenv')
dotenv.config();
const fs = require('node:fs');
const path = require('node:path');
const { Client, Collection, GatewayIntentBits, Routes } = require('discord.js');

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

client.commands = new Collection();
const commands = [];
const foldersPath = path.join(__dirname, 'commands');
const commandFolders = fs.readdirSync(foldersPath);

for (const folder of commandFolders) {
    const commandsPath = path.join(foldersPath, folder);
    const commandFiles = fs.readdirSync(commandsPath).filter(file => file.endsWith('.js') && !file.startsWith('-'));
    for (const file of commandFiles) {
        const filePath = path.join(commandsPath, file);
        const command = require(filePath);
        // Set a new item in the Collection with the key as the command name and the value as the exported module
        if ('data' in command && 'execute' in command) {
            client.commands.set(command.data.name, command);
            const json = command.data.toJSON();
            commands.push(json);
        } else {
            console.log('[WARNING] The command at ' + filePath + ' is missing a required \'data\' or \'execute\' property.');
        }
    }
}

const eventsPath = path.join(__dirname, 'events');
const eventFiles = fs.readdirSync(eventsPath).filter(file => file.endsWith('.js') && !file.startsWith('-'));

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));
    }
}

process.on("SIGTERM", async () => {
    console.log("Shutting down gracefully...");
    await client.destroy();
    process.exit(0);
});

client.login(process.env.token);

(async () => {
    try {
        console.log('Started deploying ' + commands.length + ' application (/) commands.');

        var data;
        if (process.env.guildId) data = await client.rest.put(
            Routes.applicationGuildCommands(process.env.clientId, process.env.guildId),
            { body: commands },
        );
        else data = await client.rest.put(
            Routes.applicationCommands(process.env.clientId, process.env.guildId),
            { body: commands },
        );

        console.log('Successfully deployed ' + data.length + ' application (/) commands.');
    } catch (error) {
        console.error(error);
    }
})();