Index: node_modules/d3-selection/src/selection/clone.js
===================================================================
--- node_modules/d3-selection/src/selection/clone.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-selection/src/selection/clone.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,13 @@
+function selection_cloneShallow() {
+  var clone = this.cloneNode(false), parent = this.parentNode;
+  return parent ? parent.insertBefore(clone, this.nextSibling) : clone;
+}
+
+function selection_cloneDeep() {
+  var clone = this.cloneNode(true), parent = this.parentNode;
+  return parent ? parent.insertBefore(clone, this.nextSibling) : clone;
+}
+
+export default function(deep) {
+  return this.select(deep ? selection_cloneDeep : selection_cloneShallow);
+}