Hey! I hope you're doing well. I'm working on a Ko...

# konsist

[dzaitsev]

Hey! I hope you're doing well. I'm working on a Kotlin project and using your Konsist library. I've gone through the documentation and I see that the library supports generic types, but I'm still a bit confused as I'm new to this.
My goal is to create a static analysis rule that ensure all classes extended from BaseViewModel use a generic type whose name ends with "ScreenState".
Could you please provide some guidance or an example of how to achieve this?
Thank you for your help!

Example:
class HomeViewModel : BaseViewModel<HomeScreenState>() // Correct
class ProfileViewModel : BaseViewModel<ProfileState>() // Incorrect

[PoisonedYouth]

I think this is not possible currently. You can only use a workaround like below that is asserting the text representation. But this is probably very error prone:

Konsist.scopeFromProduction()
     .classes()
     .withParentClassOf(BaseViewModel::class)
     .assertTrue {
         it.text.contains(Regex(": BaseViewModel<[^>]+ScreenState>"))
     }

[igor.wojda]

For now text cna be used, but it like API could be improved here. I have created ticket
https://lemonappdev.atlassian.net/browse/KON-626

BTW this is called generic type argument (as opppose to class generic type parameter defined in BaseViewModel lcass, usuallynamed T)

[Natalia Peterwas]

Konsist 0.17.0 has been released! This release includes this improvement 🙂

The following test should be helpful in your case:

Konsist
    .scopeFromProduction()
    .classes()
    .withParentClassOf(BaseViewModel::class)
    .parents()
    .assertTrue {
        it.typeArguments
            ?.firstOrNull()
            ?.hasNameEndingWith("ScreenState")
    }