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node_modules/d3-interpolate/src/cubehelix.js

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+import {cubehelix as colorCubehelix} from "d3-color";
+import color, {hue} from "./color.js";
+
+function cubehelix(hue) {
+  return (function cubehelixGamma(y) {
+    y = +y;
+
+    function cubehelix(start, end) {
+      var h = hue((start = colorCubehelix(start)).h, (end = colorCubehelix(end)).h),
+          s = color(start.s, end.s),
+          l = color(start.l, end.l),
+          opacity = color(start.opacity, end.opacity);
+      return function(t) {
+        start.h = h(t);
+        start.s = s(t);
+        start.l = l(Math.pow(t, y));
+        start.opacity = opacity(t);
+        return start + "";
+      };
+    }
+
+    cubehelix.gamma = cubehelixGamma;
+
+    return cubehelix;
+  })(1);
+}
+
+export default cubehelix(hue);
+export var cubehelixLong = cubehelix(color);