Catalog of MVVM guidelines

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MVVM-1 Models, Views, and ViewModels should exclusively expose their state

MVVM-2 The app should possess a single source of truth of data.

MVVM-3 Models should be evolvable/testable

MVVM-4 ViewModels should not refer to View-specific components.

MVVM-5 Views should always know about changes after ViewModels

MVVM-6 Adopt one Model for each feature of the app.

MVVM-7 Keep ViewModels as simple as possible.

MVVM-8 The state of the app should be defined in the Models only.

MVVM-9 The data produced by the Models should be reliable and of high quality.

MVVM-10 Networking or data access functionalities should be performed by Models.