Hello everyone, I need to develop a KMP library th...

# multiplatform

[Mohammad Hossein Kalantarian]

Hello everyone, I need to develop a KMP library that should be used on Android/iOS/React(Web) as the core library and only build UI on top of it natively. Anyone have a sample project for this kind of development? Is it efficiently possible? How far can I go in the core module, can I go as far as shared ViewModels?

[Chrimaeon]

what research did you do so far?
I guess this is perfect starting point to all your questions: https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-create-first-app.html#next-step

[Mohammad Hossein Kalantarian]

I have successfully made a full sample with KMP + CMP but I was wondering if I can remove the CMP layer and just use the KMP library on all platforms and develop the UI with native tools instead of CMP

[Chrimaeon]

what makes you think you cannot remove the CMP part?

[Chrimaeon]

the link above is exactly that use case. KMP with native UI.

[Fernando]

Hey, Mohamed I would just say, watch out for the JS target, since I think it can get quite hard to maintain in a side project that I did, the idea was having a Android/iOS/Web (svelte) app using a Shared package. And while the iOS part wasn't that hard using SKIE plugin, the JS wasn't as straight forward.
here are a list of things that I found difficult.
• suspend functions do not have a counter part in JS, so you need to create wrappers for your suspend methods that wrap them in a JS promise . This can get solved using the suspend-transform plugin
• You might already know that you need to mark exported things with @JsExport, which might get annoying
• Dependency Injection might be hard as well, since you need to access the concrete implementation, or you need to crate a JS object that lazily loads your dependencies with the concrete implementation
• And lastly (and is something that I haven't solved already) is that if you want to have a i.e repository that returs a flow you will again, need to craete some kind of wrapper.
Hope this helps!

[koga]

Hi! Not sure if it's the best approach, but I managed to integrate a KMP module into a React/Vite app using Koin. Still missing Flow and ViewModel integration, but I believe it's a good starting point

https://github.com/FelipeKoga/Vitamin.kt