Puppeteer: In page.emulate(option), option. hasTouch not worker

[sheweichun]

Steps to reproduce

Tell us about your environment:

• Puppeteer version:0.12.0
• Platform / OS version:mac 10.11.6
• URLs (if applicable): any mobile page

What steps will reproduce the problem?

_Please include code that reproduces the issue._

1. prepare the demo like beblow:

const puppeteer = require('puppeteer');
const devices = require('puppeteer/DeviceDescriptors');
const browser = await puppeteer.launch({headless: false});
  const page = await browser.newPage();
  await page.emulate(devices['iPad landscape']);
  await page.goto(REDIRECT_URL);

1. interact with the page in the chrome

What is the expected result?
touch operations work

What happens instead?
touch operations don't work

[JoelEinbinder]

Emulating a touch device with Puppeteer sets up the page so that something like modernizr will detect touch support. It doesn't convert mouse clicks into touch events. You can use page.touchscreen to send automated taps into the page.

[actionnick]

This should work.

const devtoolsProtocolClient = await page.target().createCDPSession();
await devtoolsProtocolClient.send("Emulation.setEmitTouchEventsForMouse", { enabled: true });

[TNT-Likely]

@actionnick it work fine for me,thanks