Determine if the given hex color is light or dark. Helpful to determining foreground color against a background color.

index.js

// https://github.com/scottcorgan/contrast

var hexToRgb = require('hex-to-rgb');

module.exports = function contrast (hex) {
	var rgb = hexToRgb(hex);
	var o = Math.round(((parseInt(rgb[0]) * 299) + (parseInt(rgb[1]) * 587) + (parseInt(rgb[2]) * 114)) /1000);
	
	return (o <= 180) ? 'dark' : 'light';
};