How to add pointer effect to the shape?

[dotku]

eg when user handover the curve, mouse would display pointer ({cursor: pointer})?

[Fil]

The role of d3-shape is to create shapes. What you do with them is out of scope.

For example, if you use the shape to draw a path in svg, you can set its css with d3-selection like so:

 d3.create("path").attr("d", shape).style("cursor", "pointer")