Проблемы автоматического скачивания файлов

const fs = require('fs');
const request = require('request');

module.exports.download = (url, dest, cb) => {
    const file = fs.createWriteStream(dest);
    const sendReq = request.get(url);

    // verify response code
    sendReq.on('response', (response) => {
        if (response.statusCode !== 200) {
            return cb({"url":url,"error":'Response status was ' + response.statusCode});
        }

        sendReq.pipe(file);
    });

    // close() is async, call cb after close completes
    file.on('finish', () => file.close(cb));

    // check for request errors
    sendReq.on('error', (err) => {
        fs.unlink(dest);
        return cb({"url":url,"error":err.message});
    });

    file.on('error', (err) => { // Handle errors
        fs.unlink(dest); // Delete the file async. (But we don't check the result)
        return cb({"url":url,"error":err.message});
    });
};