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Dependency injection

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Dependency injection (DI) is an implementation of the dependency inversion principle with the aim of separation of concerns by separating the depndency’s implementation from the class that’s using it. That kind of abstraction makes it possible to have different implementations with the same public methods so the class using it, doesn’t need to care which of the implementations is used. This is also especially useful for unit testing.

There are different types of dependency injection:

  • constructor injection
  • setter injection
  • interface injection

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    tsed

    tsedio / tsed

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    📐 Ts.ED is a Node.js and TypeScript framework on top of Express to write your application with TypeScript (or ES6). It provides a lot of decorators and guideline to make your code more readable and less error-prone. ⭐️ Star to support our work!

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    • Updated Oct 21, 2025
    • TypeScript

    Created by Martin Fowler

    Released January 23, 2004

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    Website
    github.com/topics/dependency-injection
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    Related topics

    constructor-injection dependency-injection-container dependency-inversion-principle inversion-of-control loose-coupling separation-of-concerns service-locator-pattern