DiscordJs Event Handler With SubFolders And Aliases - discord.js

Question

I have the following code which i have from a tutorial. I would like to extend it so there are subfolders (instead of just one command folder) and aliases if the user knows a different and shorter name for the command.
I added aliases and modules line, but am not sure how to implement those in in code that i have.
const fs = require('fs');
const Discord = require('discord.js');
const { prefix } = require('./config.json');
const modules = ["administration", "fun", "misc", "information"];
const client = new Discord.Client();
client.commands = new Discord.Collection();
client.aliases = 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);
}
client.once('ready', () => {
console.log('Philomena is ready for action!');
client.user.setActivity("`ph.help`")
.then(console.log)
.catch(console.error);
});
client.on('message', message => {
if (!message.content.startsWith(prefix) || message.author.bot) return;
const args = message.content.slice(prefix.length).split(/ +/);
const command = args.shift().toLowerCase();
if (!client.commands.has(command)) return;
try {
client.commands.get(command).execute(message, args);
} catch (error) {
console.error(error);
message.reply('there was an error trying to execute that command!');
}
});
client.login(process.env.BOT_TOKEN);

Answer 1

You can just repeat what you already have for every sub-folder:
const subCommandACmds = fs.readdirSync('./commands/subCommandA').filter(file => file.endsWith('.js'));
for (const file of subCommandACmds) {
const command = require(`./commands/subCommandA/${file}`);
client.commands.set(command.name, command);
}
const subCommandBCmds = fs.readdirSync('./commands/subCommandB').filter(file => file.endsWith('.js'));
for (const file of subCommandBCmds) {
const command = require(`./commands/subCommandB/${file}`);
client.commands.set(command.name, command);
}

Answer 2

To have your bot also retrieve the commands from subfolders, you could use a function like this:
client.commands=new Discord.Collection();
loadCommands(client.commands, './commands');
function loadCommands(collection, directory){
const files = fs.readdirSync(directory);
for (const file of files) {
const path=`${directory}/${file}`;
if(file.endsWith('.js')){
const command = require(path);
collection.set(command.name, command);
}
else if(fs.lstatSync(path).isDirectory()){
loadCommands(collection, path);
}
}
};