Flutter Feature Based Clean Architecture

Feature-Based Clean Architecture

Priority: P0 (CRITICAL)

Structure

Every feature lives in lib/features/ with 3-layer separation (domain/data/presentation):

• domain/ — Entities, failures, and Repository interfaces.
• data/ — DTOs, DataSource, and Repository implementations.
• presentation/ — BLoC/Cubit, pages, and widgets.

See references/folder-structure.md for complete directory blueprint.

Implementation Workflow

1. Create feature directory — Add new folder under lib/features/ (e.g., lib/features/promotions/).
2. Define domain layer — Add entities, failures, and repository interfaces with zero external dependencies.
3. Implement data layer — Add DTOs, data sources, and repository implementations that depend only on Domain.
4. Build presentation layer — Add BLoC/Cubit, pages, and widgets that depend only on Domain.
5. Enforce dependency rule — Presentation -> Domain <- Data. Domain must zero external dependencies.
6. Share cross-cutting logic — Move reusable utilities to lib/shared/ or lib/core/.

Feature Directory Example

See implementation examples for full directory tree and cross-feature import patterns.

Reference & Examples

For feature folder blueprints and cross-layer dependency templates: See references/REFERENCE.md.

Anti-Patterns

• No Cross-Feature Data Imports: Only import Domain types across features
• No UI/Data in Domain Layer: Never put UI or Data classes inside domain/
• No Nested Features: Keep lib/features/ flat with no sub-feature directories
• No Direct Repository Calls: Use specific BLoCs or use-cases instead of calling other features' repositories directly from UI

Related Topics

layer-based-clean-architecture | retrofit-networking | go-router-navigation | bloc-state-management | dependency-injection

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

• entities) but never import from loyalty's data/ or presentation/ layers,entities