Hello, I'm trying to set up my multiplatform proje...

# kodein

[Shawn Witte]

Hello, I'm trying to set up my multiplatform project with Kodein DI, and I'm wondering if there is a recommended way to create a DI to provide platform-specific implementations.

Basically, I have an interface in my common code that I have created a platform specific implementation for in JVM (no other platforms yet, since common/jvm is enough for my current level of multiplatform exploration). I originally decided to inject the platform specific code into the constructor without a framework: class SomeClass(val commonInterfaceName: CommonInterfaceName) and then inject the implementation when I start the app from the JVM entry point.

I can do the same thing now by injecting a DI instead, but I want to be able to create a DI module that I know contains all of these bindings. I'm wondering if there is a standard way to ensure that the DI being passed in has all of the necessary bindings (which I guess gets into a broader question of compile-time verification). Or if there is a way to

I'm not sure if what I'm saying is clear or not. Also, before you ask why I'm not using expect/actual, the answer is because I don't know if/when I should. It seemed like interfaces would be more robust and provide for dependency injection (in the way that I was doing it, at least). I'm still trying to work out what multiplatform best practices look like.

[Joost Klitsie]

Well you should create the application component/module in each application.
Then you can bind in each of those the platform specific implementation to the common interface

[Joost Klitsie]

for example:

// In my JS component:
fun main() {
    val di = DI {
        import(applicationModule()) // Common application module
        bind<LocalStorage>() with singleton { DefaultLocalStorage(instance()) } // Binding the DefaultLocalStorage, which is platform specific, to the LocalStorage interface
    }
}

[Joost Klitsie]

// Android:

class Application: Application(), DIAware {

    override val di by DI.lazy {
        import(applicationModule()) // Same common application module
        bind<Context>() with instance(this@Application)
        bind<LocalStorage>() with singleton { DefaultLocalStorage(instance(), instance()) } // Binding the LocalStorage to the DefaultLocalStorage from the Android component
    }
}