Why is PCM file empty when recording voice stream in discord.js?

Question

Node.js

When entering a command, the bot enters the voice channel and creates a pcm file, but does not write anything to it, who knows what the problem is?

const fs = require("fs");

module.exports.run = async (client, message, args) => {

    const voicechannel = message.member.voice.channel;
    if (!voicechannel) return message.channel.send("Please join a voice channel first!");

    const connection = await message.member.voice.channel.join();
    const audio = connection.receiver.createStream(message.member, { mode: 'opus', end: 'silence'});

    audio.pipe(fs.createWriteStream(`./recorded-${message.author.id}.pcm`));
    audio.on("end", () => {
        message.channel.send("Finished writing audio");
    });

}

module.exports.help = {
    name: "record"
};