But the fetcher call cannot resolve launch, runBlocking, async, or anything in kotlinx.coroutines. Any ideas?

This really should be in an FAQ.

runBlocking

isn’t in coroutines-common because there isn’t a version of it possible in javascript. You can use expect/actual with typeAlias on the iOS and Android platforms.

You also probably need

implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.4")

in your Android dependencies.

Thanks, I was able to get it to build by putting the code into the android actual.kt, but then i went to test the library in an android app and I get this error:

java.lang.NoClassDefFoundError: Failed resolution of: Lio/ktor/client/HttpClientJvmKt;