fewest turns

[goozo]

is there a way to pass option which would set a penalty if the path changes directions in order to get a path with fewest turns? (I need to avoid the staircase effect)

[marcong95]

I have similar requirement too, so I read the source code. But found nothing about it.
If you want to do the same thing, you can have a look on my forked version (marcong95/javascript-astar). I add some code on it referring to another project called JointJS. But do NOT use it directly for production use, I have not done any testing on it.