export function getColorContrast()

in src/utils/utils.js [95:113]

• 15 lines of code
• 3 McCabe index (conditional complexity)

export function getColorContrast(foreground, background) {
  // Formula: http://www.w3.org/TR/2008/REC-WCAG20-20081211/#contrast-ratiodef
  const backgroundLuminance = relativeLuminance(rgbFromHex(background)) + 0.05;
  const foregroundLuminance = relativeLuminance(rgbFromHex(foreground)) + 0.05;

  let score = backgroundLuminance / foregroundLuminance;
  if (foregroundLuminance > backgroundLuminance) {
    score = 1 / score;
  }

  const level = CONTRAST_LEVELS.find(({ min, max }) => {
    return score >= min && score < max;
  });

  return {
    score: (Math.round(score * 10) / 10).toFixed(1),
    level,
  };
}