mohammadwali

var favicon = {
    change: function(iconURL) {
        if (arguments.length == 2) {
            document.title = optionalDocTitle
        }
        this.addLink(iconURL, "icon")
        this.addLink(iconURL, "shortcut icon")

        // Google Chrome HACK - whenever an IFrame changes location 
        // (even to about:blank), it updates the favicon for some reason

mohammadwali

const MIN_LENGTH = 5;
const MAX_LENGTH = 63;
const ALPHA_NUMERIC_REGEX = /^[a-z][a-z\-]*[a-z0-9]*$/;
const START_END_HYPHEN_REGEX = /\A[^-].*[^-]\z/i;
const reservedNames = ['www', 'ftp', 'mail', 'pop', 'smtp', 'admin', 'ssl', 'sftp'];

const validateSubdomain = subdomain => {
    //if is reserved...
    if (reservedNames.includes(subdomain))
        throw new Error('cannot be a reserved name');