Index: node_modules/d3-interpolate/src/piecewise.js
===================================================================
--- node_modules/d3-interpolate/src/piecewise.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-interpolate/src/piecewise.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,11 @@
+import {default as value} from "./value.js";
+
+export default function piecewise(interpolate, values) {
+  if (values === undefined) values = interpolate, interpolate = value;
+  var i = 0, n = values.length - 1, v = values[0], I = new Array(n < 0 ? 0 : n);
+  while (i < n) I[i] = interpolate(v, v = values[++i]);
+  return function(t) {
+    var i = Math.max(0, Math.min(n - 1, Math.floor(t *= n)));
+    return I[i](t - i);
+  };
+}