Get the position of the mouse

mousePosition.js

const mousePosition = (() => {

	let pos = {}

	const position = (e) => ({
		x: e.pageX,
		y: e.pageY
	})

	document.addEventListener('mousemove', (e) => pos = position(e), false)
	document.addEventListener('mouseenter', (e) => pos = position(e), false)

	return () => pos

})()

Example:

mousePosition() // { x: 0, y: 0 }