@coreui/coreui-pro/js/dist/utilities/rgb-to-hex.js

UI Kit built on top of Bootstrap 4

import "core-js/modules/es.array.slice";
import "core-js/modules/es.object.to-string";
import "core-js/modules/es.regexp.to-string";
import "core-js/modules/es.string.match";

/**
 * --------------------------------------------------------------------------
 * CoreUI (v2.1.14): rgb-to-hex.js
 * Licensed under MIT (https://coreui.io/license)
 * --------------------------------------------------------------------------
 */

/* eslint-disable no-magic-numbers */
var rgbToHex = function rgbToHex(color) {
  if (typeof color === 'undefined') {
    throw new Error('Hex color is not defined');
  }

  if (color === 'transparent') {
    return '#00000000';
  }

  var rgb = color.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i);

  if (!rgb) {
    throw new Error(color + " is not a valid rgb color");
  }

  var r = "0" + parseInt(rgb[1], 10).toString(16);
  var g = "0" + parseInt(rgb[2], 10).toString(16);
  var b = "0" + parseInt(rgb[3], 10).toString(16);
  return "#" + r.slice(-2) + g.slice(-2) + b.slice(-2);
};
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