Index: node_modules/d3-hierarchy/src/treemap/squarify.js
===================================================================
--- node_modules/d3-hierarchy/src/treemap/squarify.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-hierarchy/src/treemap/squarify.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,66 @@
+import treemapDice from "./dice.js";
+import treemapSlice from "./slice.js";
+
+export var phi = (1 + Math.sqrt(5)) / 2;
+
+export function squarifyRatio(ratio, parent, x0, y0, x1, y1) {
+  var rows = [],
+      nodes = parent.children,
+      row,
+      nodeValue,
+      i0 = 0,
+      i1 = 0,
+      n = nodes.length,
+      dx, dy,
+      value = parent.value,
+      sumValue,
+      minValue,
+      maxValue,
+      newRatio,
+      minRatio,
+      alpha,
+      beta;
+
+  while (i0 < n) {
+    dx = x1 - x0, dy = y1 - y0;
+
+    // Find the next non-empty node.
+    do sumValue = nodes[i1++].value; while (!sumValue && i1 < n);
+    minValue = maxValue = sumValue;
+    alpha = Math.max(dy / dx, dx / dy) / (value * ratio);
+    beta = sumValue * sumValue * alpha;
+    minRatio = Math.max(maxValue / beta, beta / minValue);
+
+    // Keep adding nodes while the aspect ratio maintains or improves.
+    for (; i1 < n; ++i1) {
+      sumValue += nodeValue = nodes[i1].value;
+      if (nodeValue < minValue) minValue = nodeValue;
+      if (nodeValue > maxValue) maxValue = nodeValue;
+      beta = sumValue * sumValue * alpha;
+      newRatio = Math.max(maxValue / beta, beta / minValue);
+      if (newRatio > minRatio) { sumValue -= nodeValue; break; }
+      minRatio = newRatio;
+    }
+
+    // Position and record the row orientation.
+    rows.push(row = {value: sumValue, dice: dx < dy, children: nodes.slice(i0, i1)});
+    if (row.dice) treemapDice(row, x0, y0, x1, value ? y0 += dy * sumValue / value : y1);
+    else treemapSlice(row, x0, y0, value ? x0 += dx * sumValue / value : x1, y1);
+    value -= sumValue, i0 = i1;
+  }
+
+  return rows;
+}
+
+export default (function custom(ratio) {
+
+  function squarify(parent, x0, y0, x1, y1) {
+    squarifyRatio(ratio, parent, x0, y0, x1, y1);
+  }
+
+  squarify.ratio = function(x) {
+    return custom((x = +x) > 1 ? x : 1);
+  };
+
+  return squarify;
+})(phi);