arc path

d3-arc-path.js

            var route = view.map.svg
                .select(".transactions")
                .append("path")
                .datum({
                    type: "LineString",
                    coordinates: [routeCoords[0], routeCoords[1]]
                })
                .attr("class", "route")
                .attr("d", view.map.path.projection(view.map.projection));