deploy-commands.js

const { REST, Routes } = require('discord.js');
const { clientId, guildId, token } = require('./config.json');
const fs = require('node:fs');
const { createLogger, format, transports } = require('winston');

const logger = createLogger({
    level: `info`,
    format: format.json(),
    defaultMeta: { service: `command` },
    transports: [
      //
      // - Write to all logs with level `info` and below to `console.log` 
      // - Write all logs error (and below) to `error.log`.
      //
      new transports.File({ filename: `error.log`, level: `error` }),
      new transports.File({ filename: `console.log` }),
	  new transports.Console()
    ]
  });

const commands = [];
// Grab all the command files from the commands directory you created earlier
const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));

// Grab the SlashCommandBuilder#toJSON() output of each command's data for deployment
for (const file of commandFiles) {
	const command = require(`./commands/${file}`);
	commands.push(command.data.toJSON());
}

// Construct and prepare an instance of the REST module
const rest = new REST({ version: '10' }).setToken(token);

// and deploy your commands!
(async () => {
	try {
		logger.info(`Started refreshing ${commands.length} application (/) commands.`);

		// for deleting old guild-based commands
		rest.put(Routes.applicationGuildCommands(clientId, guildId), { body: [] })
			.then(() => logger.info('Successfully deleted all guild commands.'))
			.catch(console.error);

		// for deleting old global commands
		rest.put(Routes.applicationCommands(clientId), { body: [] })
			.then(() => logger.info('Successfully deleted all application commands.'))
			.catch(console.error);

		// The put method is used to fully refresh all commands in the guild with the current set
		const data = await rest.put(
			Routes.applicationGuildCommands(clientId, guildId),
			{ body: commands },
		);

		logger.info(`Successfully reloaded ${data.length} application (/) commands.`);
	} catch (error) {
		// And of course, make sure you catch and log any errors!
		logger.error(error);
	}
})();