What problem does it solve?
Angular's dependency injection can be verbose and hard to manage across large apps. This guide shows how to use inject(), tokens, and provider scopes to create clean, testable, and scalable service architectures.
Core Features & Use Cases
- Inject-based DI: Use inject() to retrieve dependencies inside classes, enabling more flexible composition and easier testing.
- Provider Scopes & Tokens: Configure root, component, and route-scoped providers with injection tokens for dynamic configurations.
- Hierarchical & Dynamic DI: Leverage hierarchical injectors and dynamic providers to adapt to platform differences and runtime flags.
- Testing Patterns: Mock, override, and swap providers during unit tests to isolate behavior.
Quick Start
Start by enabling inject() in your Angular components and define tokens for configuration, then inject dependencies via inject() to compose services.