[Wasm] Major compiler and stdlib update

libraries/stdlib/wasm/build.gradle.kts

@@ -1,19 +1,65 @@
 import org.jetbrains.kotlin.gradle.dsl.KotlinCompile
-import org.jetbrains.kotlin.gradle.plugin.KotlinJsCompilerType.IR
-import org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootExtension
-import org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootPlugin
 
 plugins {
     kotlin("multiplatform")
 }
 
+val unimplementedNativeBuiltIns =
+    (file("$rootDir/core/builtins/native/kotlin/").list().toSortedSet() - file("$rootDir/libraries/stdlib/wasm/builtins/kotlin/").list())
+        .map { "core/builtins/native/kotlin/$it" }
+
+
+
+val builtInsSources by task<Sync> {
+    val sources = listOf(
+        "core/builtins/src/kotlin/"
+    ) + unimplementedNativeBuiltIns
+
+    val excluded = listOf(
+        // JS-specific optimized version of emptyArray() already defined
+        "core/builtins/src/kotlin/ArrayIntrinsics.kt"
+    )
+
+    sources.forEach { path ->
+        from("$rootDir/$path") {
+            into(path.dropLastWhile { it != '/' })
+            excluded.filter { it.startsWith(path) }.forEach {
+                exclude(it.substring(path.length))
+            }
+        }
+    }
+
+    into("$buildDir/builtInsSources")
+}
+
+val commonMainSources by task<Sync> {
+    val sources = listOf(
+        "libraries/stdlib/common/src/",
+        "libraries/stdlib/src/kotlin/",
+        "libraries/stdlib/unsigned/"
+    )
+
+    sources.forEach { path ->
+        from("$rootDir/$path") {
+            into(path.dropLastWhile { it != '/' })
+        }
+    }
+
+    into("$buildDir/commonMainSources")
+}
+
 kotlin {
     js(IR) {
         nodejs()
     }
     sourceSets {
         val jsMain by getting {
-            kotlin.srcDirs("builtins", "internal", "runtime")
+            kotlin.srcDirs("builtins", "internal", "runtime", "src", "stubs")
+            kotlin.srcDirs(files(builtInsSources.map { it.destinationDir }))
+        }
+
+        val commonMain by getting {
+            kotlin.srcDirs(files(commonMainSources.map { it.destinationDir }))
         }
     }
 }
@@ -28,10 +74,13 @@ tasks.withType<KotlinCompile<*>>().configureEach {
         "-Xinline-classes",
         "-Xopt-in=kotlin.RequiresOptIn",
         "-Xopt-in=kotlin.ExperimentalUnsignedTypes",
-        "-Xopt-in=kotlin.ExperimentalStdlibApi"
+        "-Xopt-in=kotlin.ExperimentalStdlibApi",
+        "-Xexplicit-api=warning"
     )
 }
 
 tasks.named("compileKotlinJs") {
     (this as KotlinCompile<*>).kotlinOptions.freeCompilerArgs += "-Xir-module-name=kotlin"
+    dependsOn(commonMainSources)
+    dependsOn(builtInsSources)
 }