RGBW Node Conversion

const chroma = require('chroma-js');

var Q = 255;
var color = chroma("#FF0000").rgb();
var max = Math.max.apply(null, color);
var min = Math.min.apply(null, color);
var K;
var Wo = (min/max < 0.5) ? ((min*max) / (max-min)) : (max);

if(color[0] == color[1] && color[0] == color[2] && color[0] != null) {
  K = 1;
} else {
  K = (Wo + max) / min;
}

if (K > Q) {
  K = Q;
} else if (K < 0) {
  K = 0;
}

var Ro, Go, Bo;
Ro = Math.floor(((K * color[0]) - Wo) / Q);
Go = Math.floor(((K * color[1]) - Wo) / Q);
Bo = Math.floor(((K * color[2]) - Wo) / Q);