Circular Dependency Breaking Application Startup
Application fails to start with circular dependency error. Module A imports Module B which imports Module A, creating a cycle that prevents initialization. This often surfaces after refactoring when reorganizing modules.
The error message clearly indicates a circular dependency but resolving it requires understanding module relationships.
Error Messages You Might See
Common Causes
- Service A injects Service B which injects Service A
- Parent and child components/modules import each other
- Shared utility imported by both, but utility also imports both
- Misunderstanding of dependency direction (should be parent → child, not bidirectional)
- Barrel exports (index.js) importing too broadly
How to Fix It
Refactor to break cycle: extract shared logic to third module. Use lazy initialization (Lazy
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Get HelpFrequently Asked Questions
How to detect circular dependencies?
Build system usually shows them with stack trace. Draw dependency graph: A→B→A is circular. Should be acyclic.
How to break cycles?
Extract shared code to third module C: A→C, B→C (no A↔B). Or make one unidirectional: A→B but not B→A.
When should lazy loading be used?
When you need bidirectional relationships despite good design. @Lazy delays initialization until actually used.