node-d3-hierarchy 1.1.8-2 (amd64 binary) in ubuntu hirsute

 Many datasets are intrinsically hierarchical. Consider geographic entities,
 such as census blocks, census tracts, counties and states; the command
 structure of businesses and governments; file systems and software packages.
 .
 This module implements several popular techniques for visualizing hierarchical
 data.
 .
 Node.js is an event-based server-side JavaScript engine.