Domain-Driven Design (DDD) Architecture

Rules

Layered Architecture

• Use four-layer architecture: Presentation → Application → Domain ← Infrastructure
• Domain layer MUST be pure TypeScript with NO framework dependencies
• ALL dependencies point inward toward the Domain layer
• Do NOT allow Domain layer to depend on Application, Infrastructure, or Presentation

Dependency Direction

• Presentation MAY depend on Application and Shared layers
• Application MAY depend on Domain and Shared layers
• Infrastructure MUST depend ONLY on Domain layer interfaces
• Domain MUST NOT depend on any other layer