Dependency injection (DI) is a software design pattern used to manage dependencies between different components of an application. It is a concept that promotes loose coupling, modularity, and testability by allowing components to depend on abstractions rather than concrete implementations.
In the context of TypeScript frameworks, such as Angular, NestJS, or even custom applications, dependency injection plays a central role in managing the creation and resolution of dependencies within the application. Here's a more detailed explanation of the concept and its role in TypeScript frameworks:
1. Concept of Dependency Injection:
Dependency injection is based on the principle of inversion of control (IoC), which delegates the responsibility of creating and managing dependencies to an external entity, typically referred to as the "container" or "injector." The container is responsible for creating and injecting instances of dependent objects into the requesting components.
2. Dependency Inversion Principle (DIP):
Dependency injection follows the Dependency Inversion Principle, one of the SOLID principles of object-oriented design. The DIP states that high-level modules should not depend on low-level modules; both should depend on abstractions. In other words, rather than depending on concrete implementations, components should rely on....
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