ng-todo is

An example of best practice Angular Application Architecture of Todo MVC

Including:

NgRx state management (not needed for 99% of applications) RxJS offers 99% of NgRx's features for free
A contenteditable directive is used to enable editing via double clicking a todo.
Saves state in NgRx stores and local storage with ngrx/router-store
Architected in the highest flexible state for maximum CSS and component reuse