Technical overview
MVVM pattern heavily depends on data binding. One-way binding is quite usual in the web world, and we have decided to rely on MobX with its observables and computed values for this purpose. Frui.ts also brings some custom features to make two-way binding possible.
The View part of MVVM should work only as a projection of data presented by the ViewModel, and thus we were looking for a markup framework with declarative syntax and strong IDE support. It might be surprising, but we have chosen React. Mainly because it is widespread, has a strong community, there are many UI controls available, and it has great tooling support. However, React is used solely for the UI rendering part, there is no need for its advanced features such as Context, so it should be possible to replace it with any other framework.
Frui.ts is UI framework agnostic - you can use it with any UI framework (such as React Bootstrap or Material UI) that supports React. It is also independent of backend or API structure. However, it brings some build-in support for REST API and Bootstrap.