d3js tree.nodes() is not a function

Question

While the below piece of code works find in d3v3, it fails in v4.

 var nodes = tree.nodes(root).reverse(),
      links = tree.links(nodes);

Answer 1

import { hierarchy, tree } from 'd3-hierarchy'

// create a hierarchy from the root
const treeRoot = hierarchy(root)
tree(treeRoot)
// nodes
const nodes = treeRoot.descendants()
// links
const links = treeRoot.links()