Const isLocalhost
isLocalhost: boolean = Boolean(window.location.hostname === 'localhost' ||// [::1] is the IPv6 localhost address.window.location.hostname === '[::1]' ||// 127.0.0.1/8 is considered localhost for IPv4.window.location.hostname.match(/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/))