Suppress actual/expect classes warning

Author: fzhinkin

build.gradle.kts

@@ -4,6 +4,7 @@
  */
 
 import kotlinx.kover.gradle.plugin.dsl.MetricType
+import org.jetbrains.kotlin.gradle.dsl.KotlinJsCompile
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import org.jetbrains.kotlin.gradle.tasks.KotlinNativeCompile
 
@@ -27,11 +28,19 @@ subprojects {
         kotlinOptions {
             allWarningsAsErrors = true
             freeCompilerArgs += "-Xjvm-default=all"
+            freeCompilerArgs += "-Xexpect-actual-classes"
         }
     }
     tasks.withType<KotlinNativeCompile>().configureEach {
         kotlinOptions {
             allWarningsAsErrors = true
+            freeCompilerArgs += "-Xexpect-actual-classes"
+        }
+    }
+    tasks.withType<KotlinJsCompile>().configureEach {
+        kotlinOptions {
+            allWarningsAsErrors = true
+            freeCompilerArgs += "-Xexpect-actual-classes"
         }
     }
 }