hex-argb-converter/src/hexToArgb.ts

You can convert hex color to argb number and convert argb number to hex color

function parseIntHex(value: string) {
  return parseInt(value, 16);
}
export function hexToArgb(hex: string): number {
  hex = hex.replace("#", "");
  const isThree = hex.length === 3;
  const isSix = hex.length === 6;
  const isEight = hex.length === 8;
  if (!isThree && !isSix && !isEight) {
    throw new Error("unexpected hex " + hex);
  }
  let r = 0;
  let g = 0;
  let b = 0;
  if (isThree) {
    r = parseIntHex(hex.slice(0, 1).repeat(2));
    g = parseIntHex(hex.slice(1, 2).repeat(2));
    b = parseIntHex(hex.slice(2, 3).repeat(2));
  } else if (isSix) {
    r = parseIntHex(hex.slice(0, 2));
    g = parseIntHex(hex.slice(2, 4));
    b = parseIntHex(hex.slice(4, 6));
  } else if (isEight) {
    r = parseIntHex(hex.slice(2, 4));
    g = parseIntHex(hex.slice(4, 6));
    b = parseIntHex(hex.slice(6, 8));
  }
  return (
    ((255 << 24) | ((r & 0x0ff) << 16) | ((g & 0x0ff) << 8) | (b & 0x0ff)) >>> 0
  );
}