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Theming with Bundle Classes, Layout builder and Twig

Bundle classes

The first thing I wanted to go over is Bundle classes

Out of curiosity, who has used Bundle classes here already?

In my opinion, Bundle classes are one of the best if not the best addition to core in a long time.

Bundle classes let you define a PHP class per entity in your site. So you can have a bundle class for Nodes, Vocabs, Media, Block content and any other entity type like the User Entity.

It means you can keep business logic in one logical place per entity, saving developers from needing to dig around various places in the code to find what they're looking for.

Since they're just standard PHP classes, bundle classes allow you to reuse code across entitys with traits, interfaces, base classes etc

This leads to better code and the big win in my book, much cleaner testabilty, we'll go over this later

Another part of this talk is about Twig, and Bundle classes come with significant twig integration. Any function that starts with get or has can be called directly in your twig files. All of this leads to less preproccesses, since you already have all the functinality you need in your bundle class.

All this leads to less PHP in the theme, which I'm a big fan of.

Bundle classes are also opt-in, so for your existing sites you can slowly move code to bundle classes when new features or change requests come in, it doesn't have to be all done at once.

I highly recommend you look up some more on Bundle classes, sadly there isn't any talks on this conference on them, but I can't imagine going back to not using them.

One of the best new additions to core

Keep business logic in a single place per entity

Code sharing, interfaces and traits

Better testability

Twig integration & less preprocesses

Theming with Bundle Classes, Layout builder and Twig