discord-bot.js

const Discord = require('discord.js');
const bot = new Discord.Client();

var isReady = true;

async function sendAudio(connection, filepath) {
    console.log('sendAudio');
    return new Promise((resolve, reject) => {
        const dispatcher = connection.playFile(filepath);
        dispatcher.on('end', () => {
            setTimeout(resolve, 2000);
        });
        dispatcher.on('error', reject);
    });
}

async function sendMessage(message, pathfile) {
    isReady = false;
    message.delete();
    const connection = await message.member.voiceChannel.join();
    await sendAudio(connection, pathfile);
    await message.member.voiceChannel.leave();
    isReady = true;
}

async function handleMessage(message) {
    switch (message.content) {
        case 'estan': {
            sendMessage(message, './estan.mp3');
            break;
        }
        case 'estan2': {
            sendMessage(message, './estan2.mp3');
            break;
        }
        case 'estande': {
            sendMessage(message, './estan-slow.mp3');
            break;
        }
        case 'moan': {
            sendMessage(message, './moan1.mp3');
            break;
        }
        case 'willy': {
            sendMessage(message, './willy.mp3');
            break;
        }
        case 'brum': {
            sendMessage(message, './brum.mp3');
            break;
        }
        case 'hola': {
            sendMessage(message, './hola.mp3');
            break;
        }
        case 'rajoy1': {
            sendMessage(message, './rajoy1.mp3');
            break;
        }
        case 'callate': {
            sendMessage(message, './callate.mp3');
            break;
        }
        case 'k': {
            sendMessage(message, './k.mp3');
            break;
        }
        case 'look': {
            sendMessage(message, './look.mp3');
            break;
        }
    }
}

bot.on('message', handleMessage);

bot.login('<discord-token>');