Index: node_modules/d3-interpolate/src/lab.js
===================================================================
--- node_modules/d3-interpolate/src/lab.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-interpolate/src/lab.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,16 @@
+import {lab as colorLab} from "d3-color";
+import color from "./color.js";
+
+export default function lab(start, end) {
+  var l = color((start = colorLab(start)).l, (end = colorLab(end)).l),
+      a = color(start.a, end.a),
+      b = color(start.b, end.b),
+      opacity = color(start.opacity, end.opacity);
+  return function(t) {
+    start.l = l(t);
+    start.a = a(t);
+    start.b = b(t);
+    start.opacity = opacity(t);
+    return start + "";
+  };
+}