Operation   : Linux host59.registrar-servers.com 4.18.0-513.18.1.lve.2.el8.x86_64 #1 SMP Sat Mar 30 15:36:11 UTC 2024 x86_64
Software     : Apache
Server IP    : 198.54.126.42 | Your IP: 216.73.216.38
Domains      : 1034 Domain(s)
Permission   : [ 0755 ]

'use strict';
var semver = require('semver');

module.exports = function (a, b) {
	if (semver.gt(a, b)) {
		return null;
	}

	a = semver.parse(a);
	b = semver.parse(b);

	for (var key in a) {
		if (key === 'major' || key === 'minor' || key === 'patch') {
			if (a[key] !== b[key]) {
				return key;
			}
		}

		if (key === 'prerelease' || key === 'build') {
			if (JSON.stringify(a[key]) !== JSON.stringify(b[key])) {
				return key;
			}
		}
	}

	return null;
};