Why wheelDeltaY field is undefined in event object in wheel event handler? about pixi-viewport

[blnvdanil]

Are you listening the wheel event this way viewport.on("wheel", (e) => console.log(e))? If you are, then you should check out the documentation of Federated Events system of pixijs, this event if not special to viewport. I suppose that e.nativeEvent is what you are looking for in this case.

Viewport does not listen this event by the way, what viewport does is it attaches wheel event listener to the cavnas, that way it has an original WheelEvent of the browser.