@yookue/ts-lang-utils/dist/esm/util/ColorUtils/reverseHex.js

Common lang utilities for typescript

export function reverseHex(hex) {
  if (!hex) {
    return undefined;
  }
  var rgx = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
  var rep = hex.replace(rgx, function (m, r, g, b) {
    return r + r + g + g + b + b;
  });
  var arr = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(rep);
  if (!arr || arr.length !== 4) {
    return undefined;
  }
  var hexR = (255 - Number.parseInt(arr[1], 16)).toString(16).padStart(2, '0');
  var hexG = (255 - Number.parseInt(arr[2], 16)).toString(16).padStart(2, '0');
  var hexB = (255 - Number.parseInt(arr[3], 16)).toString(16).padStart(2, '0');
  return "#".concat(hexR).concat(hexG).concat(hexB);
}