server.js

const Discord = require("discord.js");
const client = new Discord.Client();
require("dotenv").config({
  path: "./src/.env"
});
client.login(process.env.BOT_TOKEN);
const fs = require("fs");
client.commands = new Discord.Collection();
const {
  prefix
} = require("./config.json");
const commandFiles = fs
  .readdirSync("./src/commands")
  .filter((file) => file.endsWith(".js"));
const cooldowns = new Discord.Collection();

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

client.once("ready", () => {

  console.log("Ready!");
});

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

  const args = message.content.slice(prefix.length).trim().split(/ +/);
  const commandName = args.shift().toLowerCase();

  if (!client.commands.has(commandName)) return;
  const command = client.commands.get(commandName);

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

  const now = Date.now();
  const timestamps = cooldowns.get(command.name);
  const cooldownAmount = (command.cooldown || 1) * 1000;

  if (timestamps.has(message.author.id)) {
    const expirationTime = timestamps.get(message.author.id) + cooldownAmount;

    if (now < expirationTime) {
      const timeLeft = (expirationTime - now) / 1000;
      return message.reply(
        `please wait ${timeLeft.toFixed(
          1
        )} more second(s) before reusing the \`${command.name}\` command.`
      );
    }
  }
  timestamps.set(message.author.id, now);
  setTimeout(() => timestamps.delete(message.author.id), cooldownAmount);

  try {
    command.execute(message, args);
  } catch (error) {
    console.error(error);
    message.reply("there was an error trying to execute that command!");
  }
});