Vertical Slice

Vertical Slice Architecture groups all code needed for one request or use case and minimizes coupling between slices. Each slice can use the simplest internal design that fits its behavior.

src/app/features/orders/
├── create/
├── get/
├── cancel/
└── shared/

Complete Configuration

deply:
  paths: ["."]
  exclude_files:
    - '.*/\.venv/.*'
    - '.*/tests?/.*'
  layers:
    - name: create_order
      collectors:
        - type: directory
          directories: ["src/app/features/orders/create"]
    - name: get_order
      collectors:
        - type: directory
          directories: ["src/app/features/orders/get"]
    - name: cancel_order
      collectors:
        - type: directory
          directories: ["src/app/features/orders/cancel"]
    - name: order_shared
      collectors:
        - type: directory
          directories: ["src/app/features/orders/shared"]
  ruleset:
    create_order:
      disallow_layer_dependencies: [get_order, cancel_order]
    get_order:
      disallow_layer_dependencies: [create_order, cancel_order]
    cancel_order:
      disallow_layer_dependencies: [create_order, get_order]
    order_shared:
      disallow_layer_dependencies: [create_order, get_order, cancel_order]

Only extract shared code after multiple slices need the same stable concept. Deply can reject sibling imports; it cannot determine whether a slice is cohesive or whether duplication should be refactored.

Validate

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

Reference: Jimmy Bogard’s Vertical Slice Architecture.