Although briefly possessed on screen by two Force wielders (Maul and Kanan Jarrus), I don't recall ever seeing the Darksaber being used in the way we've often seen lightsabers used in Star Wars, to deflect blaster fire. Presumably it's original creator, Tar Visla, who was a Jedi, could have used it for this purpose.
But, given that every other lightsaber is shown to have a blade that is cylindrical and the Darksaber has a distinctly flat blade, more akin to an Earthly sabre, do we have any canon or legends idea how it would deflect a blaster bolt? Could it accurately redirect blaster fire back at the shooter? And would that deflection actually be different if the edge or the flat of the blade was used?