InversifyJS

InversifyJS brings Java-style dependency injection to TypeScript. Constructor injection, decorators, container bindings, and interface-based resolution. For large applications with complex dependency graphs, it enforces structure.

The trade-off is boilerplate. Every injectable class needs decorators, every dependency needs binding registration, and the container configuration grows with the application. For smaller services, TypeScript's module system and factory functions achieve the same decoupling with less overhead. Valuable in large codebases, overkill in most.