How to detect color included in the dark or light category

isDarkColor.js

function isDarkColor(color) {
  const luminance = (0.299 * color[0] + 0.587 * color[1] + 0.114 * color[2]) / 255;
  return luminance <= 0.5;
}

function hexToRgb(hex) {
  const r = parseInt(hex.substring(1, 3), 16);
  const g = parseInt(hex.substring(3, 5), 16);
  const b = parseInt(hex.substring(5, 7), 16);
  return [r, g, b];
}

const colorHex = "#c9baba"; // hexa color 
const colorRgb = hexToRgb(colorHex); // convert to RGB
if (isDarkColor(colorRgb)) {
  console.log("Color is dark category");
} else {
  console.log("Color is light category");
}