공유 Koin 모듈 선언

Your app is full of objects that need each other: a repository needs a client, a use case needs the repository. Dependency injection hands those pieces over for you.

Koin is a lightweight DI library written in pure Kotlin, so it runs happily in commonMain and works on both Android and iOS. 🎉

You pull Koin into your shared module the same way you add any other library, listing the core artifact in your version catalog or build file.

A Koin module is just a list of recipes telling Koin how to build each dependency. You declare it once and reuse it everywhere.

The module { } builder collects your definitions. An empty one is valid; you fill it with recipes next.

Inside the module, single { } registers one shared instance Koin reuses for the whole app, perfect for a repository.

When one object needs another, call get() inside the recipe. Koin looks up the matching definition and passes it in automatically.

You can declare definitions in any order. Koin resolves the graph lazily, so a recipe can safely get() something defined further down.

Because Koin is multiplatform, place appModule in commonMain. Both your Android and iOS apps then share the exact same wiring.

Large apps split definitions into several modules, like a data module and a domain module, then combine them later when starting Koin.

A common pattern exposes your module from a function, making it easy for each platform to grab the shared definition.

Let's lock in what a Koin module does.

You met Koin, added it to your shared module, and wrote a module that registers dependencies with single and links them using get. One recipe book, both platforms. 🚀