Scrapes Info off multiple tabbed pages

server.js

const puppeteer = require('puppeteer');
const USED_CAR_SELECTOR = '#react-content > div > section > div.vehicles > div:nth-child(INDEX) > div > a';
const VIN_SELECTOR = '#page > div > div.pane-content-constrain > main > div > div > div > div > section.side > aside > p.extra-info > span:nth-child(3)';

async function run() {
  let vins = [];
  let browser = await puppeteer.launch();
  let page;
  let pages = await browser.pages();
  if (pages.length > 0) {
    page = pages[0];
    console.log('already one page default');
  } else {
    page = await browser.newPage();
    console.log('nope');
  }

  await page.goto('https://tesla.com/used');

  let carHandles = await page.$$('.vehicle-link');
  console.log('handles: ', carHandles.length);

  for (let i = 0; i < carHandles.length; i++) {
    try {
      if (i === carHandles.length - 1) {
        await page.waitFor(200);
      } else {
        await page.waitForSelector(USED_CAR_SELECTOR.replace('INDEX', i + 1));
      }

      carHandles[i].click();
      console.log('handle ' + i + ' clicked.');
    } catch (error) {
      console.log('something wrong with clicking used cars.', error);
      console.log('index wrong: ', i);
    }
  }
  console.log('Finished clicking.');

  let count = 0;
  let targets;
  while (count < carHandles.length) {
    targets = await browser.pages();
    count = targets.length;
    console.log('pages in browser: ', count);
  }

  console.log('getting vins...', targets.length);
  for (let i = 1; i < targets.length; i++) {
    let targetPage = await targets[i];
    let vin = await targetPage.evaluate((sel) => {
      if (document.querySelector(sel)) {
        return document.querySelector(sel).innerHTML;
      }
    }, VIN_SELECTOR);

    if (vin) {
      vins.push(vin);
    } else {
      console.log('i was not created:', i);
    }
  }

  let checkPages = await browser.pages();
  console.log('num of pages: ', checkPages.length);

  vins.forEach((vin, i) => {
    console.log(i + 1 + ': ' + vin);
  });


  console.log('total tabs: ', targets.length);
}
run();