Example block for d3-hiervis, which is available at https://github.com/fbreitwieser/d3-hiervis.
Gist link: https://gist.github.com/fbreitwieser/31e4be931541c74732dd6807ccb98daf. Block link: https://bl.ocks.org/fbreitwieser/31e4be931541c74732dd6807ccb98daf.