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