flutter-state-management

Implement MVVM and Unidirectional Data Flow patterns for Flutter state management. Implements robust state management and architectural patterns in Flutter applications using Unidirectional Data Flow (UDF) and the Model-View-ViewModel (MVVM) design pattern. Evaluates state complexity to differentiate between ephemeral (local) state and app (shared) state, applying the appropriate mechanisms ( setState , ChangeNotifier , or the provider package). Ensures that the UI remains a pure function of immutable state and that the data layer acts as the Single Source of Truth (SSOT). Evaluate the data requirements of the feature to determine the appropriate state management approach. Use the following decision tree: STOP AND ASK THE USER: If the scope of the state (ephemeral vs. app-wide) is ambiguous based on the provided requirements, pause and ask the user to clarify the intended scope and lifecycle of the data. For local UI state, use a StatefulWidget . Ensure that setState() is called immediately when the internal state is modified to mark the widget as dirty and schedule a rebuild.