Whether the purpose is to split a large corporate application into small pieces, or to offer general functions to other projects -- every Angular developer eventually needs to build Angular libraries. Here, we are approaching this with the official Angular Package Format which defines a lot of details to respect. For this, we develop a npm package and distribute it via a private registry. We will also talk about best practices to make this library adaptable to many use cases. After this session, you know all the tiny aspects and traps one needs to consider when building a library that seamlessly plays together with Angular and its ecosystem. Come to this session and let’s build a library!