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Dependency Injection Has Never Been This Easy in TypeScript

Dependency injection (DI) is a powerful design pattern that enhances code modularity, testability, and maintainability. However, implementing DI in TypeScript can often lead to verbose boilerplate and manual service management, making it cumbersome to work with. In this video, I explore how the Effect library simplifies DI in TypeScript, revolutionizing the way we inject and manage services like database connections and authentication sessions. 00:00 What is Dependency Injection? 00:34 The Problem (Example) 04:55 Prerequisites 06:06 Using Effect for Dependency Injection 06:54 Dependency #1: AuthContext 08:05 Dependency #2: DatabaseContext (Live Layers & Dependency Tags) 11:10 Dependency #3: DebtsRepository 13:17 Dependency #4: DebtsService 14:22 Providing the Layers 16:26 Streamlining DI with Managed Runtimes 17:26 Real Example with Express: Dynamically Providing Layers 21:05 Leveraging Composability