index.js

const fs = require('fs');
const Discord = require('discord.js');
const { prefix, token } = require('./config.json');

const client = new Discord.Client({ disableEveryone: true });
client.commands = new Discord.Collection();
const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));
client.games = new Map(); 

// for each exported module in commands
for (const file of commandFiles) {
  const command = require(`./commands/${file}`);
  // set a new item in the Collection
  // with the key as the command name and the value as the exported module
  client.commands.set(command.name, command);
}

client.once('ready', () => {
  console.log('Ready!');
});
client.once('reconnecting', () => {
  console.log('Reconnecting!');
});
client.once('disconnect', () => {
  console.log('Disconnect!');
});

// discord message listener
client.on('message', async message => {
  // if the message doesn't start with prefix or is from the bot, ignore it
  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);

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

client.login(token);