Simple showcase how a modular angular app can be built. Each app is runnable on it's own as each contains a standalone entry point.
However the submodules are designed to be included in the main-module. Each submodule is included via a lazy-loaded route.
Module A contains the setup for angular playground, a UI specific framework that enables to test and develop visual components fast and reliable. A similar technology would be Storybook for ReactJS.
You may notice that the root folder contains the folder 'packages/node_modules'. This is to utilize the way how node resolves modules in order to use just one repository and a flat project structure. Please this explanation by PouchDB for the reasons.