The Bundle system is "one of the greatest and most powerful features of Symfony2". Bundles contain all the files related to a single feature of your application: controllers, entities, event listeners, form types, Twig templates, etc. But how much of that actually needs to be inside a bundle?
In this talk I take a bundle, containing all those different types of classes, configuration files and templates, and strip it down to the bare necessities. And I promise that after moving many files out of the bundle, at the end everything still works.
While looking for ways to move things out of the bundle, I will discuss some of the more advanced features of bundle design, like prepending configuration, compiler passes and Doctrine mapping drivers. We will end with a very thin bundle, surrounded by a few highly reusable, maximally decoupled libraries.