boundary-checker

Boundary Checker Skill

FSD Import 경계 규칙을 검사하고 위반 사항을 감지합니다.

EXECUTION INSTRUCTIONS

Step 1: Load Layer Map

1. Use layer-detector skill to get current layer map
2. Build layer hierarchy for validation

Step 2: Collect Import Statements

For each file in the project:

1. Read file content

2. Extract import statements using regex:

   import\s+.*?\s+from\s+['"]([^'"]+)['"]
   

   SECURITY NOTE: Use non-greedy .*? instead of greedy .* to prevent ReDoS (Regular Expression Denial of Service) attacks from maliciously crafted import statements.

   Alternative safer patterns:

   # More specific pattern (recommended for production)
   import\s+(?:\{[^}]*\}|[^'"]+)\s+from\s+['"]([^'"]+)['"]
   
   # Or use multiple specific patterns:
   import\s+\{[^}]*\}\s+from\s+['"]([^'"]+)['"]   # Named imports
   import\s+\w+\s+from\s+['"]([^'"]+)['"]         # Default imports
   import\s+\*\s+as\s+\w+\s+from\s+['"]([^'"]+)['"]  # Namespace imports
   

3. Categorize imports:

   • Absolute (alias): @entities/user
   • Relative: ../model/types
   • External: react, lodash

Step 3: Resolve Import Paths

For each import:

1. If alias, resolve using config aliases
2. If relative, resolve from current file path
3. Determine target layer and slice

Step 4: Check Layer Hierarchy

Layer Hierarchy (top to bottom):
  app (6)
  pages (5)
  widgets (4)
  features (3)
  entities (2)
  shared (1)

Rule: Lower number cannot import from higher number

For each import:

1. Get source layer rank
2. Get target layer rank
3. If source rank < target rank → VIOLATION

Step 5: Check Cross-Slice Imports

For sliced layers (pages, widgets, features, entities):

Rule: Slices in the same layer cannot import from each other

For each import within a sliced layer:

1. Get source slice
2. Get target slice
3. If source ≠ target and same layer → VIOLATION

Exception: @x/ cross-reference pattern is allowed.

The @x/ pattern enables controlled cross-slice imports within the same layer. See "REFERENCE: @x/ Cross-Reference Pattern" section for details.