angular-di

Angular dependency injection with inject() replaces constructor parameters by allowing you to retrieve dependencies directly within class properties, improving tree-shaking and readability. This skill standardizes that pattern to create clearer, more maintainable service graphs.

Using InjectionToken for Angular providers involves defining a typed token and configuring a provider map to supply dependencies. This enables environment-specific configurations and strong typing across root, component, and route scopes.

Hierarchical injection is needed when building scalable Angular architectures where different component trees require distinct service instances. It supports dynamic providers and scoped service graphs across root, component, and route levels.

Angular multi-providers and dynamic providers are set up by configuring provider maps to inject multiple values into an array and dynamically altering dependency resolution. This skill provides patterns to build robust, configurable service architectures.

Yes, using inject() and token-based providers improves Angular service testability by standardizing dependency injection patterns. Provider maps and InjectionToken configurations allow you to easily mock and override dependencies during testing.