main.js

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

client.commands = 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('Ready!');
});

// Create an event listener for new guild members
client.on('guildMemberAdd', member => {
    // Send the message to a designated channel on a server:
    const channel = member.guild.channels.cache.find(ch => ch.name === 'welcome');
    // Do nothing if the channel wasn't found on this server
    if (!channel) return;
    // Send the message, mentioning the member
    channel.send(`Welcome to the server, ${member}`);
  });

client.on('message', message => {
    console.log(`Message string:${message.toString()}\nSent by:${message.author}`);

    if (!message.content.startsWith(prefix) || message.author.bot) return;
    
    const args = message.content.slice(prefix.length).split(/ +/);
    const command = args.shift().toLowerCase();

    if (message.channel.type === 'dm' || message.channel.name !== 'testing'){
        message.reply('Hello there');
        return;
    }


    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(token);