Inside App Designer takes care of used views, store, etc to build corresponding require statements.

Later on building and packaging i ran in to lots of warnings like
[WARN][Anonymous] [Ext.Loader] Synchronously loading 'Ext.plugin.PullRefresh'; consider adding 'Ext.plugin.PullRefresh' explicitly as a require of the corresponding class

Currently i solve this by adding a Ext. requires section to my build.html file because win sdk builder needs all loaded warning src before generating jsb3 file.

It would be great if there would be a requires config setting for application (or maybe even better in each class config) to manually declare used components. Maybe designer could also take care of used components to automatically add them to a global auto requires section.

Cheers Holger