promise_catch.js

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

function sleep(ms) {
  return new Promise((resolve) => {
    setTimeout(resolve, ms);
  });
}

const get_html = async() => {
  const browser = await puppeteer.launch({
    defaultViewport: {width: 1920, height: 1080}
    //,args: [ '--proxy-server=192.168.1.234':3128' ]
  });
  const page = await browser.newPage();
  //await page.setDefaultNavigationTimeout(10000)
  await page.goto('https://www.google.com/search?q=bitcoin');
  //await sleep(1000);

  var html = await page.content();
  await page.screenshot({path: 'screenshot.png'});
  browser.close();
  return html;
};

get_html()
  .then(html => {
    fs.writeFileSync('source.htm', html);
  })
  .catch(error => {
    console.log(error);
    process.exit(1);
  });