JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.sencha.io/ext-4.1.1-gpl/resources/css/ext-all.css">

JavaScript

Ext.onReady(function() {
    Ext.require("Ext.data.Store", function() {
        Ext.Msg.show({
            title: "callback",
            msg: "callback"
        });
    });
});