code: function isDark (r, g, b) {
    /**
     * W3C perceived brightness calculator
     * @see {@link https://www.w3.org/TR/AERT/#color-contrast}
     */
    const brightness = ((r * 299) + (g * 587) + (b * 114)) / 1000
  
    if (brightness < 140) {
      return true
    }
  
    return false
  }
docs: Color is dark
  @param {Number} r Red
  @param {Number} g Green
  @param {Number} b Blue
  @returns {Boolean} Is dark