convert project to kotlin multiplatform

Author: osoykan

.gitignore

@@ -75,3 +75,5 @@ outTmp/
 /kotlin-native/dist
 kotlin-ide/
 site/
+kotlin-js-store/
+.kotlin/

build.gradle.kts

@@ -1,33 +1,92 @@
+import org.jetbrains.kotlin.gradle.dsl.*
+
 group = "com.trendyol"
 
 plugins {
   kotlin("jvm") version libs.versions.kotlin.get()
   java
   alias(libs.plugins.spotless)
   alias(libs.plugins.maven.publish)
+  alias(libs.plugins.kover)
+  alias(libs.plugins.testLogger)
 }
 
 version = properties["version"]!!
 
+val kmpModules = listOf(
+  projects.projects.kediatrCore.name,
+  projects.projects.kediatrKoinStarter.name,
+)
+
 subprojectsOf("projects") {
+  val isKmp = name in kmpModules
+
   apply {
-    plugin("kotlin")
-    plugin("java")
+    if (isKmp) {
+      plugin("org.jetbrains.kotlin.multiplatform")
+    } else {
+      plugin("kotlin")
+      plugin("java")
+    }
     plugin(rootProject.libs.plugins.spotless.pluginId)
     plugin(rootProject.libs.plugins.maven.publish.pluginId)
+    plugin(rootProject.libs.plugins.kover.pluginId)
+    plugin(rootProject.libs.plugins.testLogger.pluginId)
   }
 
+  configureKotlin(isKmp)
+
   spotless {
     kotlin {
       ktlint(rootProject.libs.ktlint.cli.get().version)
         .setEditorConfigPath(rootProject.layout.projectDirectory.file(".editorconfig"))
     }
   }
 
-  java {
-    withSourcesJar()
+  kover {
+    reports {
+      filters {
+        excludes {
+          packages("com.trendyol.kediatr.testing")
+        }
+      }
+    }
+  }
+
+  dependencies {
+    kover(project)
+  }
+
+  // KMP modules handle sources jar automatically, JVM-only modules need explicit configuration
+  if (!isKmp) {
+    java {
+      withSourcesJar()
+    }
+
+    dependencies {
+      implementation(rootProject.libs.kotlinx.coroutines.core)
+      testImplementation(rootProject.libs.kotlinx.coroutines.test)
+      testImplementation(rootProject.libs.kotest.assertions.core)
+      testImplementation(rootProject.libs.kotest.assertions.table)
+      testImplementation(rootProject.libs.kotest.framework.engine)
+      testImplementation(rootProject.libs.kotest.runner.junit5)
+    }
+  }
+
+  tasks.withType<Test> {
+    useJUnitPlatform()
+    configure<com.adarshr.gradle.testlogger.TestLoggerExtension> {
+      setTheme("mocha")
+      showStandardStreams = true
+    }
+    reports {
+      junitXml.required.set(true)
+      html.required.set(true)
+    }
   }
+}
 
+subprojects.of("project", except = listOf(projects.projects.kediatrTesting.name)) {
   mavenPublishing {
     coordinates(groupId = rootProject.group.toString(), artifactId = project.name, version = rootProject.version.toString())
     publishToMavenCentral()
@@ -57,3 +116,21 @@ subprojectsOf("projects") {
     signAllPublications()
   }
 }
+
+fun Project.configureKotlin(isKmp: Boolean) {
+  val kotlinExtension = if (isKmp) {
+    extensions.getByType<KotlinMultiplatformExtension>()
+  } else {
+    extensions.getByType<KotlinJvmProjectExtension>()
+  }
+
+  kotlinExtension.apply {
+    jvmToolchain(17)
+    compilerOptions {
+      val commonArgs = listOf("-Xskip-metadata-version-check", "-Xexpect-actual-classes")
+      val args = if (isKmp) commonArgs else listOf("-Xjsr305=strict") + commonArgs
+      freeCompilerArgs.addAll(args)
+      allWarningsAsErrors.set(true)
+    }
+  }
+}