i have an expect class like so ```expect class Vid...

# multiplatform

[youssef hachicha]

i have an expect class like so

expect class VideoTrack

its actual in android looks like this

import org.webrtc.VideoTrack

actual typealias VideoTrack = VideoTrack

and I get this error when ever I run, it says to check my definition but the class is defined for all of my platfroms

[chrisjenx]

Yeah that won't work, there is not actual implementation, typealias is literally just a different name for the same type

[chrisjenx]

// common

expect class VideoTrack {
 abstract fun start()
 abstract fun stop()
}

// android

actual class VideoTrack {
  val impl = org.webrtc.VideoTrack()
  override fun start() = impl.start()
  override fun stop() = impl.stop()
}

[chrisjenx]

i.e. https://github.com/Kotlin/kotlinx-datetime/blob/master/core/common/src/LocalDate.kt
vs
https://github.com/Kotlin/kotlinx-datetime/blob/master/core/jvm/src/LocalDate.kt

[hfhbd]

You can use actual typealias 🤔 https://github.com/hfhbd/ComposeTodo/blob/main/clients/src/androidMain/kotlin/app/softwork/composetodo/viewmodels/ViewModels.kt

[hfhbd]

But you do need to add the expect functions in the expect class in commonmain

[hfhbd]

From commonmain view, the expect class has no functions.

[chrisjenx]

Interesting, not sure how that works as commonMain wouldn't be able to resolve that platform type. probably helps in cases like that extention function, very specific use case tho.

[hfhbd]

K2: Commonmain does not resolve the platform type at all, that’s why you need to write the expect functions