JSFiddle - React, Tailwind, and code Playground

JavaScript

(function( $ ){
    var rboolean = /^(?:autofocus|autoplay|async|checked|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped|selected)$/i,
        rreadonlyheaders = /(accept-(charset|encoding)|content-length|(content-)?transfer-encoding|cookie2?|date|expect|host|keep-alive|referer|te|trailer|upgrade|user-agent|via)/ig,
        rbeforesendreadonly = /setrequestheader\([\"'](accept-(charset|encoding)|content-length|(content-)?transfer-encoding|cookie2?|date|expect|host|keep-alive|referer|te|trailer|upgrade|user-agent|via)/ig,
        ajaxFunc, header;
    
    $.each( 'attr removeAttr'.split(' '), function( i, val ) {
        var realFunc = $.fn[ val ];
        $.fn[ val ] = function( name ) {    
            if ( rboolean.test(name) ) {
                // How should we warn people using browsers that don't implement console && console.warn ( I'm looking at you IE7- ).
                // Swallow the errors, do an alert, or should we create some kind of floating warn box on the page since this is a *debug* script?
                console.warn( 'You should be using jQuery.fn.prop to set boolean property: ' + name );
            }            
            return realFunc.apply( this, Array.prototype.slice.call(arguments, 0) );
        };
    });

    ajaxFunc = $.ajax;
    
    $.ajax = function( url, settings ) {
        if ( !settings && $.isPlainObject(url) ) {
            settings = url;
        }
        
        if ( settings ) {
            if ( settings.headers ) {
                for ( header in settings.headers ) {
                    if ( rreadonlyheaders.test(header) ) {
                        console.warn( 'Attempting to set readonly XHR header: ' + header );
                    }
                }
            }
            
            // SetRequestHeader isn't exposed here, so the best thing I can think of to do is check the actual function definition
            if ( settings.beforeSend ) {
                while ( (header =...