You'll need to import the javascript file in your website before starting from this .
const { screen } = window.WTN
//to keep device screen on all the time
screen.keepScreenOn()
//to revert back to normal screen behaviour
screen.keepScreenNormal()
import { keepScreenOn, keepScreenNormal } from "webtonative/Screen"
//to keep device screen on all the time
keepScreenOn()
//to revert back to normal screen behaviour
keepScreenNormal()