architecture-feature-first

Feature-first architecture in Flutter groups each feature into its own folder with layered UI, logic, and data responsibilities, keeping views focused on presentation and repositories on data access. It requires unidirectional data flow and adjacent-layer communication.

Separate UI and data logic in Flutter by assigning presentation to views, state and commands to business logic holders, and data access to repositories or services. This layered responsibility ensures clear boundaries and unidirectional data flow.

Yes, dependency injection is a required component for layered Flutter feature structures. It wires dependencies across adjacent layers and clarifies which layer should own each piece of logic, ensuring services and repositories remain decoupled from the UI.

Refactor an existing Flutter app to a feature-first structure when UI and data concerns are mixed, making features hard to test and build. This structure eases refactoring by separating repository, service, and view responsibilities into distinct layers.

Directly accessing repositories from the UI breaks Flutter state management by bypassing the logic layer. Enforcing adjacent-layer communication and placing state holders between views and data services restores unidirectional data flow and clean boundaries.