Discord のテキストから音声に変換

const { Client, GatewayIntentBits } = require('discord.js');
const { joinVoiceChannel, createAudioPlayer,
        createAudioResource } = require('@discordjs/voice');
const fetch = require('node-fetch');
const fs = require('fs');

const client = new Client({
    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages,
              GatewayIntentBits.GuildVoiceStates, GatewayIntentBits.MessageContent]
});

client.on('messageCreate', async (message) => {
    if (!message.content.startsWith('!say ')) return;
    const text = message.content.slice(5);

    // Generate speech with TTS.ai API
    const res = await fetch('https://api.tts.ai/v1/tts', {
        method: 'POST',
        headers: {
            'Authorization': 'Bearer YOUR_API_KEY',
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({
            text: text,
            model: 'kokoro',
            voice: 'af_heart',
            format: 'wav'
        })
    });

    // Play in voice channel
    const buffer = await res.buffer();
    fs.writeFileSync('/tmp/tts.wav', buffer);
    const connection = joinVoiceChannel({
        channelId: message.member.voice.channelId,
        guildId: message.guildId,
        adapterCreator: message.guild.voiceAdapterCreator
    });
    const player = createAudioPlayer();
    player.play(createAudioResource('/tmp/tts.wav'));
    connection.subscribe(player);
});