Puppeteer: How to handle multiple tabs?

Question

Scenario: Web form for developer app registration with two part workflow.

Page 1: Fill out developer app details and click on button to create Application ID, which

Answer 1

it looks like there's a simple 'page.popup' event

Page corresponding to "popup" window Emitted when the page opens a new tab or window.

const [popup] = await Promise.all([
  new Promise(resolve => page.once('popup', resolve)),
  page.click('a[target=_blank]'),
]);
const [popup] = await Promise.all([
  new Promise(resolve => page.once('popup', resolve)),
  page.evaluate(() => window.open('https://example.com')),
]);

credit to this github issue for easier 'targetcreated'