Обход ссылок, поиск на них JS-ошибок и сигнализирование об этом в Slack

gulpfile.js

//В phpdoc контроллера указать @url

gulp.task('urlfind', function () {
    return gulp.src('modules/*.class.php')
        .pipe(find(/@url.(.+)+/g))
        .pipe(replace('@url ', '\r\n'))
        .pipe(concat('urls.txt', {newLine: ''}))
        .pipe(replace('\r\n\r\n', ''))
        .pipe(replace(',', ''))
        .pipe(gulp.dest(''));
})

url_test.js

/**
 * Created by daager on 10.10.16.
 * require Nightmare.js
 */
fs = require('fs');
var urls = fs.readFileSync('urls.txt', 'utf-8').split('\r\n');

var Nightmare = require('nightmare');

var IncomingWebhooks = require('@slack/client').IncomingWebhook;
var url_hook = 'https://hooks.slack.com/services/*********/*********/**************************';
var wh = new IncomingWebhooks(url_hook);

function asd(url) {
    if (url == '') {
        if (urls.length > 0) {
            asd(urls.shift())
        }
        return;
    }
    var result = '';
    Nightmare({
        show: false,
        width: 1600,
        height: 800
    })
        .on('page', function (type, message, stack) {
            console.log(stack)
            result = result + stack;
        })
        .goto(url)
        .end()
        .then(function () {
            console.log('url_test: ' + url);
            if (result.length > 0) {
                wh.send({
                    text: result + url,
                    channel: 'js_error',
                    icon_emoji: ':scream:',
                    username: 'url_test.js'
                });
                console.log(result);
                console.log('');
            }
            if (urls.length > 0) {
                asd(urls.shift())
            }
        });
}

asd(urls.shift())