d3-dag/src/dag/height.js

Layout algorithms for visualizing directed acylic graphs.

// Set each node's value to zero for leaf nodes and the greatest distance to
// any leaf for other nodes
export default function() {
  return this.eachAfter(
    (n) => (n.value = Math.max(0, ...n.children.map((c) => 1 + c.value)))
  );
}