[Wasm] Add wasi stdlib target gradle buildscript

KT-56608

libraries/stdlib/wasm/js/build.gradle.kts

@@ -0,0 +1,47 @@
+import org.jetbrains.kotlin.gradle.targets.js.d8.D8RootPlugin
+import org.jetbrains.kotlin.gradle.targets.js.KotlinWasmTargetAttribute
+
+plugins {
+    `maven-publish`
+    kotlin("multiplatform")
+}
+
+description = "Kotlin Standard Library for experimental WebAssembly JS platform"
+
+D8RootPlugin.apply(rootProject).version = v8Version
+
+val targetDependentSources = listOf("builtins/kotlin", "internal", "src/kotlin", "src/kotlinx", "src/org.w3c").map {
+    "$rootDir/libraries/stdlib/wasm/js/$it"
+}
+
+configureWasmStdLib(
+    wasmTargetParameter = "wasm-js",
+    wasmTargetAttribute = KotlinWasmTargetAttribute.js,
+    targetDependentSources = targetDependentSources,
+    targetDependentTestSources = listOf("$rootDir/libraries/stdlib/wasm/testJs/"),
+    kotlinTestDependencyName = ":kotlin-test:kotlin-test-wasm-js"
+) { extensionBody ->
+    kotlin(extensionBody)
+}
+
+afterEvaluate {
+    // cleanup default publications
+    // TODO: remove after mpp plugin allows avoiding their creation at all, KT-29273
+    publishing {
+        publications.removeAll { it.name != "Main" }
+    }
+
+    tasks.withType<AbstractPublishToMaven> {
+        if (publication.name != "Main") this.enabled = false
+    }
+
+    tasks.named("publish") {
+        doFirst {
+            publishing.publications {
+                if (singleOrNull()?.name != "Main") {
+                    throw GradleException("kotlin-stdlib-wasm should have only one publication, found $size: ${joinToString { it.name }}")
+                }
+            }
+        }
+    }
+}