How to use the chroma-js.cubehelix function in chroma-js

.gamma(0.7)
        .lightness([0.3, 0.8])
        .scale() // convert to chroma.scale
        .correctLightness()
        .colors(5);

    chroma.scale('RdYlBu');
    chroma.scale('RdYlBu').padding(0.15);

    chroma.scale('OrRd');
    chroma.scale('OrRd').padding([0.2, 0]);

    chroma.scale('OrRd').classes(5);
    chroma.scale('OrRd').classes(8);

    myChroma.cubehelix()
        .start(200)
        .rotations(-0.35)
        .gamma(0.7)
        .lightness([0.3, 0.8])
        .scale() // convert to chroma.scale

        .correctLightness()
        .colors(5);

    myChroma.scale('RdYlBu');
    myChroma.scale('RdYlBu').padding(0.15);
}

function palette() {
  // prettier-ignore
  return chroma
    .cubehelix()
    .start(randomNumber(0, 360))
    .rotations(-0.35)
    .gamma(0.7)
    .lightness([0.4, 0.8])
  .scale()
    .correctLightness()
    .colors(DEPTH + 2);
}

function randomColor() {
  // prettier-ignore
  return chroma.cubehelix()
    .start(range(0, 360))
    .rotations(-0.5)
    .gamma(0.8)
    .lightness([0.3, 0.8])(range(0, 1));
}

prepareColors(l1, l2){
        //const colors = chroma.scale(['#fafa6e','#2A4858']).mode('lch').colors(l1);
        const colors = chroma.cubehelix().start(200).rotations(-0.35).gamma(0.7).lightness([0.7, 1]).scale().correctLightness().colors(l1);
        //const sub_colors = chroma.scale(['#1a75ff', 'grey']).mode('lch').colors(l2);
        //const sub_colors = chroma.scale('OrRd').colors(l2);
        //const sub_colors = chroma.cubehelix().start(200).rotations(-0.35).gamma(0.7).lightness([0.4, 0.85]).scale().correctLightness().colors(l2);
        //const sub_colors = chroma.scale(['green', 'yellow', 'teal', 'blue']).mode('lch').colors(l2)
        let rc, sub_colors = [];
        for(let i=1; i<= l2; i++){
            rc = chroma.random();
            sub_colors.push(rc);
        }
        return [colors, sub_colors];
    }
    renderTooltip(xLabel, yLabel, params){

/**
 * Color function transfer management.
 * Requires chroma.js
 */
//var colormaps = function(){
var chroma = require("chroma-js");
  const svgNS = "http://www.w3.org/2000/svg";
  
  var tables = {
    Default: [[0,1],[0,1],[0,1]], //[[1,1,1],[0.93,0.001,0],[0.63,0.001,0]],
    OrRd: tableFromChroma(chroma.brewer.OrRd),
    PuBu: tableFromChroma(chroma.brewer.PuBu),
    Oranges: tableFromChroma(chroma.brewer.Oranges),
    Greens:  tableFromChroma(chroma.brewer.Greens),
    CubeHelix: tableFromChroma(chroma.cubehelix().scale().correctLightness().colors(9)),
    InvertedGrayscale: [[1,0.01,0],[1,0.01,0],[1,0.01,0]],
    Identity: [[0,1],[0,1],[0,1]]
  };

  function tableFromChroma(chromaTable){
    var rtab = [];
    var gtab = [];
    var btab = [];
    
    chromaTable.forEach(function(chromaElt){
      var rgb = chroma(chromaElt).get('rgb');
      rtab.push(rgb[0]/255);
      gtab.push(rgb[1]/255);
      btab.push(rgb[2]/255);
    });

CUBEHELIX.map((x, i) => (
              
            ))}