Async functions example

README.md

Code from:

puppeteer/puppeteer#1505 (comment)

Transformed to async function for practicing.

puppeteer-example-async-functions.js

const puppeteer = require("puppeteer"); // v0.13.0

const URL = "https://en.wikipedia.org/api/rest_v1/page/html/Maybeshewill";

goToPageAndClose(URL).catch(error => console.log("Error: ", error));

async function goToPageAndClose(url) {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();

  console.log(`page#goto(${URL})`);
  const navigation = page.goto(URL, {
    timeout: 5000,
    waitUntil: "networkidle2"
  });

  // Defer closing the page so that navigation can start.
  await nextTick();

  console.log("page#close()");
  await page.close();

  console.log("browser#close()");
  // Close the browser so that the Node.js process can
  // exit.
  browser.close();

  return navigation;
}

function nextTick() {
  return new Promise(res => process.nextTick(res));
}

puppeteer-example-promises.js

const puppeteer = require('puppeteer') // v0.13.0

const URL = 'https://en.wikipedia.org/api/rest_v1/page/html/Maybeshewill'

function gotoAndClose(browser) {
    browser.newPage()
        .then((page) => {
            console.log(`page#goto(${URL})`)

            // Defer closing the page so that navigation can start.
            process.nextTick(() => {
                console.log('page#close()')

                page.close()
                    .then(() => {
                        console.log('browser#close()')

                        // Close the browser so that the Node.js process can
                        // exit.
                        browser.close()
                    })
            })

            return page.goto(URL, {
                timeout: 5000,
                waitUntil: 'networkidle2'
            })
        })
        .catch((error) => console.log('Error: ', error))
}

puppeteer.launch()
    .then(gotoAndClose)