@hexorialstudio/color-blinder/src/index.js

Color Blinder Simulate color blindness of the given valid color hex code

/*
 * color-blinder
 * https://github.com/HexorialStudio/color-blinder
 *
 * see blinder.js for more information about the original source.
 *
 * Copyright (c) 2020 Hexorial Studio LLP
 * Licensed under the MIT license.
 */
"use strict";

var Blinder = require("./blinder.js").Blind;
var colorVisionData = {
  protanomaly: { type: "protan", anomalize: true },
  protanopia: { type: "protan" },
  deuteranomaly: { type: "deutan", anomalize: true },
  deuteranopia: { type: "deutan" },
  tritanomaly: { type: "tritan", anomalize: true },
  tritanopia: { type: "tritan" },
  achromatomaly: { type: "achroma", anomalize: true },
  achromatopsia: { type: "achroma" },
};

var hexToRgb = (hex) => {
  // Convert HEX value to RGB value
  const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  return result
    ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16),
      }
    : null;
};
const rgbToHex = (rgb) => {
  // Convert RGB value to Hex value
  if (!rgb || !rgb.r || !rgb.g || !rgb.b) {
    return "#000000";
  }

  return `#${toHex(rgb.r)}${toHex(rgb.g)}${toHex(rgb.b)}`;
};
const toHex = function (c) {
  // converts string to Hex
  var hex = parseInt(c).toString(16);
  return hex.length == 1 ? "0" + hex : hex;
};
var createBlinder = function (key) {
  return function (colorString) {
    var color = hexToRgb(colorString);
    if (!color) {
      return "#000000";
    }
    var rgb = new Blinder(
      {
        R: color.r,
        G: color.g,
        B: color.b,
      },
      colorVisionData[key].type,
      colorVisionData[key].anomalize
    );

    rgb.R = rgb.R || 0;
    rgb.G = rgb.G || 0;
    rgb.B = rgb.B || 0;
    delete rgb.X;
    delete rgb.Y;
    delete rgb.Z;

    return rgbToHex({
      r: rgb.R,
      g: rgb.G,
      b: rgb.B,
    });
  };
};

// add our exported functions
for (var key in colorVisionData) {
  exports[key] = createBlinder(key);
}