Index: node_modules/d3-selection/src/local.js
===================================================================
--- node_modules/d3-selection/src/local.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-selection/src/local.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,27 @@
+var nextId = 0;
+
+export default function local() {
+  return new Local;
+}
+
+function Local() {
+  this._ = "@" + (++nextId).toString(36);
+}
+
+Local.prototype = local.prototype = {
+  constructor: Local,
+  get: function(node) {
+    var id = this._;
+    while (!(id in node)) if (!(node = node.parentNode)) return;
+    return node[id];
+  },
+  set: function(node, value) {
+    return node[this._] = value;
+  },
+  remove: function(node) {
+    return this._ in node && delete node[this._];
+  },
+  toString: function() {
+    return this._;
+  }
+};