It seems like you cannot use kotlinx.coroutines.flow.MutableStateFlow in common code? Only platform-...

# multiplatform

[Mgj]

It seems like you cannot use kotlinx.coroutines.flow.MutableStateFlow in common code? Only platform-specific code?

[gildor]

I didn’t check myself, but it should be available there, it’s in common code:
https://github.com/Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-core/common/src/flow/StateFlow.kt#L123

[Mgj]

Yeah the rest of the "flow" namespace seems to be available but not the new-ish StateFlow's which i thought was weird. Im unable to import it and get an error while building about it being an unresolved reference

[gildor]

are you sure that you use 1.3.6+ for common code? Maybe just common uses an old version

[Mgj]

I think i am:

sourceSets {
	def coroutines_version = "1.3.7"
	commonMain {
            dependencies {
                implementation(kotlin('stdlib-common'))
                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version")
                // ...
            }
        }

[Mgj]

Its the same version i use for the android code where it works fine 🤔

[Mgj]

Just for future reference, i needed to add "org.jetbrains.kotlinx:kotlinx-coroutines-core-common:$coroutines_version" as a dependency (note -common)

[gildor]

Interesting, I thought that it already works with Gradle metadata without separate dependencies
Do you use the latest Gradle?

[Mgj]

Could be because of that, im not on the latest Gradle (using 3.6.3 , 4.x should be out now)

[gildor]

3.6.3? Don't think it's Gradle version, looks like Android Gradle Plugin version

[edenman]

i’m definitely using MutableStateFlow in my common code fwiw

[edenman]

oh and yeah i have both coroutines-core and coroutines-core-common specified in my common module deps. my issue was some transitive dep was screwing up the version # iirc

[gildor]

Ahh, transitive dependency can break it, just because there are 2 artifacts with different name but same content, had similar issue when kotlin stdlib artifact was renamed from jre to jdk
I think the better solution is exclude it on level of Gradle

[louiscad]

@Mgj Reading your build.gradle snippet, I'm not seeing the dependency on kotlinx coroutines common for commonMain, you specified the JVM artifact (note: this becomes correct starting Kotlin 1.4-M2 because these artifacts start being Multiplatform publications)

[gildor]

Oh, so Gradle metadata for coroutines works only from 1.4

[louiscad]

Before 1.4, it works with -native prefixed artifacts.

[gildor]

Yes, right, it was only for different native platforms.
It was quite messy experience to have all those different dependencies for every platform
Even for stdlib or ootlin-test

[louiscad]

Actually, it works for non Kotlin/Native targets/platforms as well, but these are gone(replaced) for 1.4-M2

[Mgj]

Interesting.... good to know, thank you