client.on('message... event listener problem

bot.js

console.log('Beep Boop Beep'); //prints 'Beep Boop Beep'

require('dotenv').config(); //load the dotenv node pachage and call a config() func to load thea values from .env

const Discord = require('discord.js');

const client = new Discord.Client({ ws: { intents: [
    'GUILDS',
    'GUILD_MESSAGES',
    'GUILD_PRESENCES',
    'GUILD_MEMBERS'
] } });

//this line authenticates the bot with the discord API
client.login(process.env.BOTTOKEN); 

const embed = new Discord.MessageEmbed()
	.setColor('#0099ff')
	.setTitle('Some title')
	.setURL('https://discord.js.org/')
	.setAuthor('Some name', 'https://i.imgur.com/wSTFkRM.png', 'https://discord.js.org')
	.setDescription('Some description here')
	.setThumbnail('https://i.imgur.com/wSTFkRM.png')
	.addFields(
		{ name: 'Regular field title', value: 'Some value here' },
		{ name: '\u200B', value: '\u200B' },
		{ name: 'Inline field title', value: 'Some value here', inline: true },
		{ name: 'Inline field title', value: 'Some value here', inline: true },
	)
	.addField('Inline field title', 'Some value here', true)
	.setImage('https://i.imgur.com/wSTFkRM.png')
	.setTimestamp()
	.setFooter('Some footer text here', 'https://i.imgur.com/wSTFkRM.png');

//exporting those so that they are available in other .js files
module.exports = {client, embed};

//ready discord function prings stuff to terminal
function readyDiscord() {
    console.log('readyDiscord func executed. Discord is ready.'); 
}
client.on('ready', readyDiscord); 

//if a !command is typed send it to commandHandler
const commandHandler = require('./commands'); 
client.on('message', commandHandler);

//if a new member is added, DM him with a message
client.on('guildMemberAdd', async member => { 
    console.log(member)

    const message = `Hey, <@${member.id}>! Welcome. DM me if anytime you want.`
    
    const channel = await member.guild.channels.resolve(process.env.WELCOME_CHANNEL_ID);
    channel.send(message)
})

commands.js

const hey = require('./commands/hey.js');
const bind = require("./commands/bind.js");
const help = require("./commands/help.js");

const commands = { bind, hey, help };

module.exports = function (msg) {

    //commands only work within 'bot commands channel'
    if (msg.channel.type === 'dm') { 
        /*'.split()' method divides a string and puts it into an array.
        * the division is done by searching for a pattern which is the first parameter 
        * in the method's call */ 
        let tokens = msg.content.split(" ");

        /* moves the whole array one element forward, removes the first element and.
        * returns it. this is needed if some bot command has arguments. 
        * for instance: !bind 'key to bind to' */
        let command = tokens.shift();

        //bot command is only valid when it starts with a !
        if (command.charAt(0) === '!') {
            /*this one removes the first element of the. in our case it removes
            * the ! of the command and places command itself into commnad vairable.
            * so now command variable contains 'hey, bind' or smth, like that*/
            command = command.substring(1);

            /* take the 'commands' obj, take a function named [command] from it and 
            * pass (msg, tokens) to it. msg object contains all the message metadata
            * and tokens is an array of the command with all of it's arguments */
            commands[command](msg, tokens);
        }
    }
};