Index: node_modules/d3-array/src/greatestIndex.js
===================================================================
--- node_modules/d3-array/src/greatestIndex.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-array/src/greatestIndex.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,19 @@
+import ascending from "./ascending.js";
+import maxIndex from "./maxIndex.js";
+
+export default function greatestIndex(values, compare = ascending) {
+  if (compare.length === 1) return maxIndex(values, compare);
+  let maxValue;
+  let max = -1;
+  let index = -1;
+  for (const value of values) {
+    ++index;
+    if (max < 0
+        ? compare(value, value) === 0
+        : compare(value, maxValue) > 0) {
+      maxValue = value;
+      max = index;
+    }
+  }
+  return max;
+}