kowalski/commands/youtube.js

var exec = require('child_process').exec;

async function DownloadFromYoutube(command) {
    return new Promise((resolve, reject) => {
        
        exec(command, (error, stdout, stderr) => {
            if (error) {
                reject({ error, stdout, stderr });
            } else {
                resolve({ error, stdout, stderr });
            }
        });
    });
}

module.exports = (bot) => {
    bot.command('yt', async (ctx) => {
        const args = ctx.message.text.split(' ').slice(1).join(' ');
        const ytCommand = 'yt-dlp ' + args + ' -o video.mp4';
        await DownloadFromYoutube(ytCommand);
            try{
                await ctx.replyWithVideo({source: 'video.mp4'});
            }catch (error){
              console.log(error);
            }
    }
    )
}