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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I think APDS-9960 only has a handful of sensors, enough to detect a hand swipe, but not what you'd associate with an optical mouse.
So you could kind of do a mouse, but it'd be amazingly slow - you'd have to swipe you hand over it multiple times to get to where you want - a bit like trying to do it by pressing arrow keys, but worse :)
There are other sensors that could be used though. Pretty much all of the mouse-related ones are 0.1" pins so are dead easy to solder to...