angular-di

Angular dependency injection providers for lazy-loaded modules are configured using hierarchical injectors and specific providedIn strategies. This approach controls service scope and lifecycle, ensuring predictable provider resolution in lazy-loaded contexts without duplicating singletons.

The best way to migrate to functional inject() is to replace constructor parameters with the inject() function while preserving existing provider scope and singleton semantics. This modern pattern improves testability and enables safer dependency resolution in Angular applications.

InjectionToken is used for non-class dependencies in Angular when configuring dependency injection for interfaces, configuration objects, or primitive values. It provides a type-safe mechanism for provider resolution where standard class-based tokens are not applicable.

Hierarchical injection in Angular components creates a tree of injectors that determines service scope and lifecycle. By configuring providers at specific levels, you control whether components receive shared singletons or independent service instances.

Yes, factory providers and multi-provider configurations manage Angular dependency injection by allowing dynamic service creation and registering multiple dependencies under a single token. These patterns support complex provider resolution and testable configurations.

Refactoring Angular dependency injection improves maintainability and testability by standardizing provider configuration, applying modern inject() patterns, and enforcing predictable service scoping. These practices reduce unexpected provider resolution behavior during migrations and testing.