d3Selection.pointer does not work on mobile device

[stoneshell]

event.clientX, event.clientY are undefined.

Maybe get the values from event.touches ?

[mbostock]

Please read the documentation:

https://github.com/d3/d3-selection/blob/master/README.md#pointer

You need to pass a Touch to d3.pointer, not a TouchEvent. Also see d3.pointers.

[HarelM]

I migrated to latest version and also suffered from this mistake.
But moreover, I'm listening to both touch and mouse and I'm passing the e.touches[0] in case of touch and e in case of mouse.
The problem is that the currentTarget for Touch does not exists so passing Touch to pointer will result in an unwanted behavior.
While I understand I can pass the e.currentTarget it would be helpful to write it in the docs linked above or even in the method description to prevent other developers from creating a bug :-)

[HarelM]

So basically my code looks like this when using pointer

const expectedEvent = (window.TouchEvent && e instanceof TouchEvent) ? e.touches[0] : e;
return this.chartElements.xScale.invert(d3.pointer(expectedEvent, e.currentTarget)[0]);