Index: node_modules/d3-selection/src/window.js
===================================================================
--- node_modules/d3-selection/src/window.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-selection/src/window.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,5 @@
+export default function(node) {
+  return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node
+      || (node.document && node) // node is a Window
+      || node.defaultView; // node is a Document
+}