Module Resolution and Caching
When Node.js encounters a module import, it resolves the requested path or package, loads the module, evaluates it, and caches the result. Understanding resolution helps diagnose problems involving relative paths, package exports, duplicate dependencies, and circular dependencies.
Circular dependencies occur when module A depends on B while B also depends directly or indirectly on A. They can produce partially initialized exports and should generally be avoided through better dependency design.
Circular Dependencies
Circular dependencies can produce undefined or partially initialized values. Refactoring shared logic into a third module is often cleaner.
Key Takeaways
- Node resolves modules according to the import type and package configuration.
- Module caching prevents repeated evaluation of the same resolved module.
- Circular dependencies can create difficult initialization bugs.
Knowledge Check
What is a common problem with circular dependencies?