bot-boilerplate.js

const Discord = require("discord.js");
const client = new Discord.Client();
const fs = require("fs");

require("dotenv").config();

const prefix = "!";

const commandFiles = fs.readdirSync("commands", "utf8");
client.commands = new Discord.Collection();
client.cooldowns = new Discord.Collection();

for (const file of commandFiles) {
  const command = require(`./commands/${file}`);
  client.commands.set(command.name, command);
}

client.once("ready", () => {
  console.log("Beep boop. Boop beep?");
})

client.on("message", message => {
  if (!message.content.startsWith(prefix) || message.author.bot) {
    return;
  }

  const args = message.content.slice(prefix.length).split(" ");
  const commandName = args.shift().toLowerCase();
  const command = client.commands.get(commandName) || client.commands.find(cmd => cmd.aliases && cmd.aliases.includes(commandName));

  if (command) {
    if (!client.cooldowns.has(command.name)) {
      client.cooldowns.set(command.name, new Discord.Collection());
    }

    const now = Date.now();
    const timestamps = client.cooldowns.get(command.name);
    const cooldown = (command.cooldown || 3) * 1000;

    if (timestamps.has(message.author.id)) {
      const expiration = timestamps.get(message.author.id) + cooldown;
      if (now < expiration) {
        const timeLeft = (expiration - now) / 1000;
        message.reply(`Sorry, to avoid spam, you need to wait ${timeLeft.toFixed(1)} more seconds before you can use \`${command.name}\` again!`);
      }
    } else {
      timestamps.set(message.author.id, now);
      setTimeout(() => timestamps.delete(message.author.id), cooldown);
      if (command.args && args.length <= 0) {
        message.channel.send(`This command requires arguments: \`!${command.name} ${command.usage}\``);
      } else {
        try {
          command.execute(message, args);
        } catch (err) {
          message.channel.send(err.toString());
        }
      }
    }
  }
})

client.login(process.env.BOT_TOKEN);