The new architecture highlights are:

Components called Sections that implement a specific user interface of the application. Each section instance implements a different interface. Login section, as example, implements everything the frontend needs to request users their credentials; Passport section implements the user management frontend;

A Composer component with the only task of managing application routing and Sections rendering;

Each Section is managed by a single engineering team;

Each Section must be decoupled from other sections and from the composer: it has to be possible to test it on its own;

Starting the SPA will just load the Composer which will dynamically load Section based on what’s needed to render user “route” (url);

https://medium.com/thron-tech/single-page-application-from-monolithic-to-modular-c1d413c10292