Dependency Injection with TypeScript: Bringing Order to Chaos

2023/08/18

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The article discusses the importance of dependency injection in TypeScript and how it can bring order to chaotic code. The author shares their experience of refactoring a project that lacked SOLID principles and testability. They highlight the challenges of a function that combines sending login emails and creating user accounts, making it difficult to test and reuse. The author then explains how dependency injection can address these issues by refactoring the code to be more reusable and testable. They emphasize that well-structured code is inherently testable and that dependency injection plays a crucial role in achieving this. By decoupling dependencies and injecting them into classes or functions, developers can easily mock dependencies for testing purposes. The article concludes by highlighting the synergy between code structure and testability, and how dependency injection can help achieve both.