chrome headless print-to-pdf

pdf.js

'use strict';

const puppeteer = require('puppeteer');
const devices = require('puppeteer/DeviceDescriptors');

const [url, title] = process.argv.slice(-2,);
console.log('loading', title, url);

(async() => {

const browser = await puppeteer.launch();
const page = await browser.newPage();
// await page.emulate(devices['iPhone 6']);
await page.goto(url, {waitUntil: 'load'});
// page.pdf() is currently supported only in headless mode.
// @see https://bugs.chromium.org/p/chromium/issues/detail?id=753118

await page.setViewport({
	width: await page.evaluate(() => document.body.clientWidth),
	height: await page.evaluate(() => document.body.clientHeight)
});

await autoScroll(page);

await page.pdf({
  path: './articles/' + title + '.pdf',
  format: 'A4'
});

await browser.close();

})();


function autoScroll(page){
  return page.evaluate(() => {
      return new Promise((resolve, reject) => {
          var totalHeight = 0;
          var distance = 100;
          var timer = setInterval(() => {
              var scrollHeight = document.body.scrollHeight;
              window.scrollBy(0, distance);
              totalHeight += distance;

              if(totalHeight >= scrollHeight){
                  clearInterval(timer);
                  resolve();
              }
          }, 1000);
      })
  });
}