rogueChecker.js

const puppeteer = require('puppeteer');

var accountSid = ''; // Your Account SID from www.twilio.com/console
var authToken = '';   // Your Auth Token from www.twilio.com/console

var twilio = require('twilio');
var client = new twilio(accountSid, authToken);

var inStock = [];

const inStockSelector = '.pager .amount';

async function checkStock(url2check,word) {
    inStock[word] = await inStock[word] ? inStock[word] : 0;
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto(url2check);
    await page.waitFor(500);
    await page.waitForSelector(inStockSelector);
    const results = await page.$(inStockSelector);
    const stockFilter = await page.$('.remove-x');
    const inStockText = await results.evaluate(element => element.innerText);
    const currentStock = await stockFilter == null ? 0 : parseInt(inStockText.split(' ')[0]);
    console.log('Current stock for ' + word + ': ' + currentStock);

    if (currentStock != inStock[word]) {
      inStock[word] = currentStock;
      await client.messages.create({
        body: 'Go buy your ' + word + ', the stock just changed to ' + inStock[word] + '! ' + url2check,
        to: '+',  // Text this number
        from: '+' // From a valid Twilio number
      })
      .then((message) => console.log(message.sid));
    }

    await browser.close();
    setTimeout(checkStock, 180000, url2check, word);
}

checkStock('https://www.roguefitness.com/weightlifting-bars-plates/bumpers?is_salable[0]=1','weights');
checkStock('https://www.roguefitness.com/strength-equipment/strength-training/benches?is_salable[0]=1','bench');
checkStock('https://www.roguefitness.com/weightlifting-bars-plates/barbells?is_salable[0]=1','barbell');