Index: node_modules/d3-hierarchy/src/hierarchy/index.js
===================================================================
--- node_modules/d3-hierarchy/src/hierarchy/index.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-hierarchy/src/hierarchy/index.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,91 @@
+import node_count from "./count.js";
+import node_each from "./each.js";
+import node_eachBefore from "./eachBefore.js";
+import node_eachAfter from "./eachAfter.js";
+import node_find from "./find.js";
+import node_sum from "./sum.js";
+import node_sort from "./sort.js";
+import node_path from "./path.js";
+import node_ancestors from "./ancestors.js";
+import node_descendants from "./descendants.js";
+import node_leaves from "./leaves.js";
+import node_links from "./links.js";
+import node_iterator from "./iterator.js";
+
+export default function hierarchy(data, children) {
+  if (data instanceof Map) {
+    data = [undefined, data];
+    if (children === undefined) children = mapChildren;
+  } else if (children === undefined) {
+    children = objectChildren;
+  }
+
+  var root = new Node(data),
+      node,
+      nodes = [root],
+      child,
+      childs,
+      i,
+      n;
+
+  while (node = nodes.pop()) {
+    if ((childs = children(node.data)) && (n = (childs = Array.from(childs)).length)) {
+      node.children = childs;
+      for (i = n - 1; i >= 0; --i) {
+        nodes.push(child = childs[i] = new Node(childs[i]));
+        child.parent = node;
+        child.depth = node.depth + 1;
+      }
+    }
+  }
+
+  return root.eachBefore(computeHeight);
+}
+
+function node_copy() {
+  return hierarchy(this).eachBefore(copyData);
+}
+
+function objectChildren(d) {
+  return d.children;
+}
+
+function mapChildren(d) {
+  return Array.isArray(d) ? d[1] : null;
+}
+
+function copyData(node) {
+  if (node.data.value !== undefined) node.value = node.data.value;
+  node.data = node.data.data;
+}
+
+export function computeHeight(node) {
+  var height = 0;
+  do node.height = height;
+  while ((node = node.parent) && (node.height < ++height));
+}
+
+export function Node(data) {
+  this.data = data;
+  this.depth =
+  this.height = 0;
+  this.parent = null;
+}
+
+Node.prototype = hierarchy.prototype = {
+  constructor: Node,
+  count: node_count,
+  each: node_each,
+  eachAfter: node_eachAfter,
+  eachBefore: node_eachBefore,
+  find: node_find,
+  sum: node_sum,
+  sort: node_sort,
+  path: node_path,
+  ancestors: node_ancestors,
+  descendants: node_descendants,
+  leaves: node_leaves,
+  links: node_links,
+  copy: node_copy,
+  [Symbol.iterator]: node_iterator
+};