How to read file with okio inside commanMain module in a Kotlin Multiplatform Project? - kotlin

Question

I am trying to read/write files in the commonMain module.
I created a new Kotlin Multiplatform App for Android and iOS using the Android Studio Wizard. (New -> New Project ... -> Koltin Multiplatform App)
Then I added okio as dependency to common in the shared/build.gradle.kts file.
sourceSets {
val okio = "3.3.0"
val commonMain by getting {
dependencies {
implementation("com.squareup.okio:okio:$okio")
}
}
...
In the module commonMain I cannot access FileSystem.SYSTEM (Unresolved Reference: SYSTEM) and therefore not read or write any files.
In the module iOSMain and androidMain I can access FileSystem.SYSTEM. Is this expected behaviour? This would require me to write an expected/actual mapping for all okio apis. Or is there an other way?
Or do I need to configure my project differently to be able to access FileSystem.SYSTEM inside the commonMain-Module?
shared/build.gradle
plugins {
kotlin("multiplatform")
kotlin("native.cocoapods")
id("com.android.library")
}
kotlin {
android()
iosX64()
iosArm64()
iosSimulatorArm64()
cocoapods {
summary = "Some description for the Shared Module"
homepage = "Link to the Shared Module homepage"
version = "1.0"
ios.deploymentTarget = "14.1"
podfile = project.file("../iosApp/Podfile")
framework {
baseName = "shared"
}
}
sourceSets {
val okio = "3.3.0"
val commonMain by getting {
dependencies {
implementation("com.squareup.okio:okio:$okio")
}
}
val commonTest by getting {
dependencies {
implementation(kotlin("test"))
}
}
val androidMain by getting
val androidTest by getting
val iosX64Main by getting
val iosArm64Main by getting
val iosSimulatorArm64Main by getting
val iosMain by creating {
dependsOn(commonMain)
iosX64Main.dependsOn(this)
iosArm64Main.dependsOn(this)
iosSimulatorArm64Main.dependsOn(this)
}
val iosX64Test by getting
val iosArm64Test by getting
val iosSimulatorArm64Test by getting
val iosTest by creating {
dependsOn(commonTest)
iosX64Test.dependsOn(this)
iosArm64Test.dependsOn(this)
iosSimulatorArm64Test.dependsOn(this)
}
}
}
android {
namespace = "de.pixel.kmmpodstryout"
compileSdk = 32
defaultConfig {
minSdk = 21
targetSdk = 32
}
}
Greetings.kt in commonMain from the sample app generated by the wizard:
package de.pixel.kmmpodstryout
import okio.FileSystem
import okio.Path.Companion.toPath
class Greeting {
private val platform: Platform = getPlatform()
fun greet(): String {
val path = "helloworld.txt".toPath()
FileSystem.SYSTEM <--- "Unresolved Reference SYSTEM"
return "Hello, ${platform.name} ${readFile()}!"
}
}