text: import {hcl as colorHcl} from "d3-color";
  import color, {hue} from "./color.js";
  
  function hcl(hue) {
    return function(start, end) {
      var h = hue((start = colorHcl(start)).h, (end = colorHcl(end)).h),
          c = color(start.c, end.c),
          l = color(start.l, end.l),
          opacity = color(start.opacity, end.opacity);
      return function(t) {
        start.h = h(t);
        start.c = c(t);
        start.l = l(t);
        start.opacity = opacity(t);
        return start + "";
      };
    }
  }
  
  export default hcl(hue);
  export var hclLong = hcl(color);
  