Index: node_modules/d3-array/src/map.js
===================================================================
--- node_modules/d3-array/src/map.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-array/src/map.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,5 @@
+export default function map(values, mapper) {
+  if (typeof values[Symbol.iterator] !== "function") throw new TypeError("values is not iterable");
+  if (typeof mapper !== "function") throw new TypeError("mapper is not a function");
+  return Array.from(values, (value, index) => mapper(value, index, values));
+}