<client>.on('message', message => {
if (message.content === '!ping') {
message.channel.send('Pong.');
} else if (message.content.startsWith('beep')) {
message.channel.send('Boop.');
}
});
// The client is the bot itself.
// You would have defined this at the top of your index.js/app.js
// It would look like 'const client = new Discord.Client()'
// Put that in place for '<client>' and remove the <>