upgrade up to multiplatform project

build.gradle

@@ -1,6 +1,3 @@
-project.version = "0.6.0"
-project.group = "com.github.insanusmokrassar"
-
 buildscript {
     repositories {
         mavenLocal()
@@ -15,9 +12,14 @@ buildscript {
     }
 }
 
-apply plugin: 'kotlin'
+plugins {
+    id "org.jetbrains.kotlin.multiplatform" version "$kotlin_version"
+}
 apply plugin: 'kotlinx-serialization'
 
+project.version = "0.6.0"
+project.group = "com.github.insanusmokrassar"
+
 apply from: "publish.gradle"
 
 repositories {
@@ -25,17 +27,48 @@ repositories {
     jcenter()
     mavenCentral()
     maven { url "https://kotlin.bintray.com/kotlinx" }
-    maven { url "https://dl.bintray.com/kotlin/ktor" }
 }
 
-dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
-    implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime:$kotlin_serialisation_runtime_version"
-    implementation "com.soywiz.korlibs.klock:klock:$klock_version"
-    implementation "io.ktor:ktor-client-core:$ktor_version"
-    implementation "io.ktor:ktor-client-okhttp:$ktor_version"
+kotlin {
+    jvm()
+    js(BOTH) {
+        browser()
+        nodejs()
+    }
 
-    // Use JUnit test framework
-    testImplementation 'junit:junit:4.13'
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation kotlin('stdlib')
+
+                api "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
+                api "org.jetbrains.kotlinx:kotlinx-serialization-core:$kotlin_serialisation_runtime_version"
+                api "com.soywiz.korlibs.klock:klock:$klock_version"
+                api "io.ktor:ktor-client-core:$ktor_version"
+            }
+        }
+        commonTest {
+            dependencies {
+                implementation kotlin('test-common')
+                implementation kotlin('test-annotations-common')
+            }
+        }
+        jvmMain {
+            dependencies {
+                implementation kotlin('stdlib')
+            }
+        }
+        jvmTest {
+            dependencies {
+                implementation kotlin('test-junit')
+                implementation "io.ktor:ktor-client-okhttp:$ktor_version"
+            }
+        }
+        jsMain {
+            dependencies {
+                implementation kotlin('test-js')
+            }
+        }
+    }
 }