login_to_github.js

const puppeteer = require('puppeteer');

const LOGIN = async (page) {
  const USER = {
    username : "<username>",
    password : "<password>"
  }
  // dom element selectors
  const USERNAME_SELECTOR = '#login_field';
  const PASSWORD_SELECTOR = '#password';
  const BUTTON_SELECTOR = '#login > form > div.auth-form-body.mt-3 > input.btn.btn-primary.btn-block';
  
  await page.click(USERNAME_SELECTOR);
  await page.type(USER.username);

  await page.click(PASSWORD_SELECTOR);
  await page.type(USER.password);

  await page.click(BUTTON_SELECTOR);

  await page.waitForNavigation();
}

async function run() {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  
  await page.goto('https://github.com');
  await page.screenshot({path: 'screenshots/github.png'});
  
  await LOGIN(page);
  await page.screenshot({path: 'screenshots/LOGIN.png'});

  browser.close();
}

run();