Dependency Injection for JavaScript & TypeScript

injection-js is a lightweight (5.2KB minified) dependency injection library specifically designed for JavaScript and TypeScript applications outside of the Angular framework. Extracted from Angular's pre-v5 dependency injection system, it retains its feature completeness, speed, reliability, and robust testing. The library is currently at version 2.6.1 and provides a runtime reflection-based DI solution, differentiating itself from Angular's modern compile-time `StaticInjector`. It is ideal for Node.js, Vue, React, or vanilla JS/TS projects that require a sophisticated DI system without the full Angular ecosystem. Key requirements include a Reflect API polyfill (e.g., `reflect-metadata`) and specific `tsconfig.json` flags for TypeScript decorator support.