Browser detection for ES6 support

browser-support.js

/**
 * Detect browser capabilities on the server.
 */
var useragent = require('useragent')

var MinimumForES6 = {
	"Chrome": 49,
	"Edge": 14,
	"Firefox": 45,
	"Safari": 10
}

function supportsES6(headers) {

	var agent = useragent.lookup(headers['user-agent'])
	var requiredVersion = MinimumForES6[agent.family]

	if (requiredVersion) {
		return parseInt(agent.major) >= requiredVersion
	}

	return false
}

exports.supportsES6 = supportsES6