Node‑DI is a lightweight Dependency Injection framework for Node.js that lets developers declare object dependencies in modules and have an injector automatically construct and wire them together (supporting type, factory and value bindings, with annotation via parameter names or comments). It’s aimed at Node developers—particularly those building test runners like Karma—who want a simple, Angular‑inspired DI container for managing object graphs and simplifying testing, though the project is now deprecated in favor of angular/di.