How to detect device mode emulation?

Question

Referring to Chrome\'s ability to emulate device resolution and touch events: https://developer.chrome.com/devtools/docs/device-mode

The actual issue:

Answer 1

I ended with:

window.navigator.userAgent.indexOf('Mobile') !== -1;

Chrome adds Mobile to userAgent in device emulation mode, for example "Mozilla/5.0 (iPhone; CPU iPhone OS 10_3 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) CriOS/56.0.2924.75 Mobile/14E5239e Safari/602.1"

'TouchEvent' in window && 'ontouchstart' in window

isn’t providing correct state in real time when you turning on/off device mode unfortunately