Index: node_modules/d3-hierarchy/src/treemap/slice.js
===================================================================
--- node_modules/d3-hierarchy/src/treemap/slice.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-hierarchy/src/treemap/slice.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,12 @@
+export default function(parent, x0, y0, x1, y1) {
+  var nodes = parent.children,
+      node,
+      i = -1,
+      n = nodes.length,
+      k = parent.value && (y1 - y0) / parent.value;
+
+  while (++i < n) {
+    node = nodes[i], node.x0 = x0, node.x1 = x1;
+    node.y0 = y0, node.y1 = y0 += node.value * k;
+  }
+}