Transform a HEX color to RGBA

hexToRgbA.js

export default function hexToRgbA(hex, alpha = 1) {
  var c;

  if (/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex)) {
    c = hex.substring(1).split('');

    if (c.length == 3) {
      c = [c[0], c[0], c[1], c[1], c[2], c[2]];
    }

    c = '0x' + c.join('');

    return `rgba(${[(c >> 16) & 255, (c >> 8) & 255, c & 255].join(',')},${alpha})`;
  }

  throw new Error('Bad Hex');
}