neumorphism utils.ts

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  export function colorLuminance(hex: string, lum?: number) {
  // validate hex string
  hex = String(hex).replace(/[^0-9a-f]/gi, '');
  if (hex.length < 6) {
    hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
  }
  lum = lum || 0;

  // convert to decimal and change luminosity
  let rgb = '#';
  let c;
  let i;
  for (i = 0; i < 3; i++) {
    c = parseInt(hex.substring(i * 2, i * 2 + 2), 16);
    c = Math.round(Math.min(Math.max(0, c + c * lum), 255)).toString(16);
    rgb += ('00' + c).substring(c.length);
  }

  return rgb;
}

export const isValidColor = (hex: string) => /^#[0-9A-F]{6}$/i.test(hex);