In this chapter we have learned how to create a new theme using the new theming engine of Ext JS 4.2, we learned why it is important to make a production build and how to do it, including the difference between the files from the development environment those for the production environment.
We have also learned about Sencha Desktop Packager and how to natively package our Ext JS application to be executed as a native application on Mac OS, Linux, and Windows. We learned that it is not simply a matter of packaging the application and that some changes are required. In case we want to distribute the application to be accessed from different domains, there are alternatives we can use.
In the next chapter, we will learn how to build a complete WordPress theme using Ext JS.