title: How to change headless from false to true ? [puppeteer]
body: <p>How to change headless from false to true ?
  How to hide browser?</p>
  
  <pre><code>const browser = await puppeteer.launch({headless: false})
  const page = await browser.newPage();
  await page.goto(LOGIN_URL, { "waitUntil": "networkidle2" });
  await page.evaluate((a) =&gt; {
     $('input[name="username"]').val(a.username)
     $('input[name="password"]').val(a.password)
  }, {username, password})
   // I want to hide the browser
   // do something
  await browser.close();
  </code></pre>