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Domain Layer

Purpose

The domain layer is the core of the application. It contains all business rules, entities, and contracts. It has no dependencies on any other layer and no knowledge of Flutter, HTTP, or databases.

Rules

  • No Flutter imports (package:flutter/...).
  • No infrastructure imports (no HTTP clients, no JSON libraries, no third-party data packages).
  • No dependency on the application layer.
  • All public APIs that can fail must return Either<E, T> or TaskEither<E, T> from fpdart.

Components

Component Description
Entities Immutable objects that represent core business concepts
Enums Domain-level enumerations; no serialization logic
Errors Typed failures specific to each domain concept
Repository Interfaces Contracts the infrastructure layer must fulfill
Validators Field-level validation rules expressed as typed objects

Folder Structure

domain/
├── entities/
│   ├── enums/
│   │   ├── user_status.dart
│   │   └── order_status.dart
│   ├── user.dart
│   └── order.dart
├── errors/
│   ├── user_error.dart
│   └── order_error.dart
├── repositories/
│   ├── i_user_repository.dart
│   └── i_order_repository.dart
└── validators/
    ├── email_field.dart
    └── password_field.dart

Detailed Docs