DDD / Bounded Contexts

Domain-Driven Design uses bounded contexts to keep models and language valid inside explicit business boundaries. Deply can enforce package ownership, not the quality of the domain model or aggregate invariants.

src/app/
├── ordering/{domain,application,infrastructure}/
├── payments/{domain,application,infrastructure}/
└── shared_kernel/

Complete Configuration

deply:
  paths: ["."]
  exclude_files:
    - '.*/\.venv/.*'
    - '.*/tests?/.*'
  layers:
    - name: ordering
      collectors:
        - type: directory
          directories: ["src/app/ordering"]
    - name: payments
      collectors:
        - type: directory
          directories: ["src/app/payments"]
    - name: ordering_domain
      collectors:
        - type: directory
          directories: ["src/app/ordering/domain"]
    - name: payments_domain
      collectors:
        - type: directory
          directories: ["src/app/payments/domain"]
    - name: shared_kernel
      collectors:
        - type: directory
          directories: ["src/app/shared_kernel"]
  ruleset:
    ordering:
      disallow_layer_dependencies: [payments, payments_domain]
    payments:
      disallow_layer_dependencies: [ordering, ordering_domain]
    ordering_domain:
      disallow_layer_dependencies: [payments, payments_domain]
      disallow_external_imports: [django, fastapi, flask, sqlalchemy, requests]
    payments_domain:
      disallow_layer_dependencies: [ordering, ordering_domain]
      disallow_external_imports: [django, fastapi, flask, sqlalchemy, requests]
    shared_kernel:
      disallow_layer_dependencies: [ordering, payments, ordering_domain, payments_domain]

Overlapping collectors should be ordered carefully because one element can match both a context and its domain layer. Prefer the more specific domain layers for rules that isolate business logic. Create a shared kernel only for stable concepts genuinely shared by both contexts.

Deply cannot verify ubiquitous language, aggregate invariants, context maps, or the organizational ownership implied by a bounded context.

Validate

deply validate --config=deply.yaml
deply analyze --parallel --config=deply.yaml

Reference: Domain analysis and bounded contexts.