The book does not provide the code and it can be simpler to just see the code. Since the book the docs have some extra info that is excellent to see folder structure and get clarification. https://nx.dev/angular/guides/monorepo-nx-enterprise.
duncanhunter/enterprise-angular-mono-repo-patterns-book
This is example implementation of the concepts in the 'Enterprise Angular mono repo patterns' book. Showing the folder structure with some extra libs for clarification.
TypeScript