Introduce new Gradle plugin org.jetbrains.kotlin.js

This is the Gradle plugin that does not rely on the
Java model and uses the same Kotlin model
(target – compilation – source set) as MPP does.

Also add JS DCE support for this plugin.

Issue #KT-5756 Fixed
Issue #KT-13256 Fixed
Issue #KT-16355 Fixed
Issue #KT-20156 Fixed
Issue #KT-29284 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -349,4 +349,36 @@ class Kotlin2JsGradlePluginIT : BaseGradleIT() {
             assertNotContains(USING_JS_INCREMENTAL_COMPILATION_MESSAGE)
         }
     }
+
+    @Test
+    fun testNewKotlinJsPlugin() = with(Project("kotlin-js-plugin-project", GradleVersionRequired.AtLeast("4.10.2"))) {
+        setupWorkingDir()
+        gradleBuildScript().modify(::transformBuildScriptWithPluginsDsl)
+        gradleSettingsScript().modify(::transformBuildScriptWithPluginsDsl)
+
+        build("publish", "runDceKotlin", "test", "runDceBenchmarkKotlin") {
+            assertSuccessful()
+
+            assertTasksExecuted(
+                ":compileKotlin", ":compileTestKotlin", ":compileBenchmarkKotlin",
+                ":runDceKotlin", ":runDceBenchmarkKotlin"
+            )
+
+            val moduleDir = "build/repo/com/example/kotlin-js-plugin/1.0/"
+
+            val publishedJar = fileInWorkingDir(moduleDir + "kotlin-js-plugin-1.0.jar")
+            ZipFile(publishedJar).use { zip ->
+                val entries = zip.entries().asSequence().map { it.name }
+                assertTrue { "kotlin-js-plugin.js" in entries }
+            }
+
+            val publishedPom = fileInWorkingDir(moduleDir + "kotlin-js-plugin-1.0.pom")
+            val kotlinVersion = defaultBuildOptions().kotlinVersion
+            val pomText = publishedPom.readText().replace(Regex("\\s+"), "")
+            assertTrue { "kotlinx-html-js</artifactId><version>0.6.10</version><scope>compile</scope>" in pomText }
+            assertTrue { "kotlin-stdlib-js</artifactId><version>$kotlinVersion</version><scope>runtime</scope>" in pomText }
+
+            assertFileExists(moduleDir + "kotlin-js-plugin-1.0-sources.jar")
+        }
+    }
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlin-js-plugin-project/build.gradle.kts

@@ -0,0 +1,47 @@
+plugins {
+    kotlin("js").version("<pluginMarkerVersion>")
+    id("kotlin-dce-js")
+    `maven-publish`
+}
+
+group = "com.example"
+version = "1.0"
+
+repositories {
+    mavenLocal()
+    jcenter()
+}
+
+kotlin.sourceSets {
+    main {
+        dependencies {
+            api("org.jetbrains.kotlinx:kotlinx-html-js:0.6.10")
+            implementation(kotlin("stdlib-js"))
+        }
+    }
+    test {
+        dependencies {
+            implementation(kotlin("test-js"))
+        }
+    }
+}
+
+kotlin.target.compilations.create("benchmark") {
+    defaultSourceSet.dependencies {
+        val main by kotlin.target.compilations
+        implementation(main.compileDependencyFiles + main.output.classesDirs)
+        runtimeOnly(main.runtimeDependencyFiles)
+    }
+}
+
+publishing {
+    publications {
+        create("default", MavenPublication::class.java) {
+            from(kotlin.target.components.single())
+            artifact(tasks.getByName("kotlinSourcesJar"))
+        }
+    }
+    repositories {
+        maven("$buildDir/repo")
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlin-js-plugin-project/settings.gradle.kts

@@ -0,0 +1,15 @@
+pluginManagement {
+    resolutionStrategy {
+        eachPlugin{
+            when (requested.id.id) {
+                "kotlin-dce-js" -> useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:<pluginMarkerVersion>")
+            }
+        }
+    }
+    repositories {
+        mavenLocal()
+        gradlePluginPortal()
+    }
+}
+
+rootProject.name = "kotlin-js-plugin"

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlin-js-plugin-project/src/benchmark/kotlin/MainBenchmark.kt

@@ -0,0 +1,9 @@
+package com.example
+
+class MainBenchmark {
+    fun runBenchmark() {
+        main()
+        hello()
+        console.log("ran at the speed of light")
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlin-js-plugin-project/src/main/kotlin/Main.kt

@@ -0,0 +1,15 @@
+package com.example
+
+import kotlinx.html.dom.create
+import kotlinx.html.js.div
+import kotlinx.html.p
+import kotlin.browser.document
+
+fun hello() = "hello"
+
+fun main() {
+    document.create.div {
+        p { hello() }
+    }
+    console.log(hello())
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlin-js-plugin-project/src/test/kotlin/MainTest.kt

@@ -0,0 +1,11 @@
+package com.example
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class MainTest {
+    @Test
+    fun testHello() {
+        assertEquals("hello", hello())
+    }
+}