Index: node_modules/d3-selection/src/selection/enter.js
===================================================================
--- node_modules/d3-selection/src/selection/enter.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-selection/src/selection/enter.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,22 @@
+import sparse from "./sparse.js";
+import {Selection} from "./index.js";
+
+export default function() {
+  return new Selection(this._enter || this._groups.map(sparse), this._parents);
+}
+
+export function EnterNode(parent, datum) {
+  this.ownerDocument = parent.ownerDocument;
+  this.namespaceURI = parent.namespaceURI;
+  this._next = null;
+  this._parent = parent;
+  this.__data__ = datum;
+}
+
+EnterNode.prototype = {
+  constructor: EnterNode,
+  appendChild: function(child) { return this._parent.insertBefore(child, this._next); },
+  insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
+  querySelector: function(selector) { return this._parent.querySelector(selector); },
+  querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
+};