thgh

export function lighten(color = '#004488', opacity = 1) {
  // Convert to color channels
  const num = parseInt(color.slice(1), 16)
  let R = num >> 16,
    G = (num >> 8) & 0x00ff,
    B = num & 0x0000ff

  // Interpolate channel
  opacity = Math.min(Math.max(opacity, 0), 1)
  R = Math.round(R + (1 - opacity) * (255 - R))