[Gradle, JS] Add Groovy Closure support

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsPlugin.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.gradle.targets.js
 
+import groovy.lang.Closure
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.plugins.ExtensionAware
@@ -35,21 +36,59 @@ open class KotlinJsPlugin(
 
         checkGradleCompatibility()
 
-        val npm = object : Npm {
-            override fun invoke(packageName: String, version: String): NpmDependency {
+        val dependencies = project.dependencies as ExtensionAware
+
+        val npm: Npm = object : Npm, Closure<NpmDependency>(dependencies) {
+            override operator fun invoke(packageName: String, version: String): NpmDependency {
                 return NpmDependency(project, null, packageName, version)
             }
 
-            override fun invoke(org: String, packageName: String, version: String): NpmDependency {
+            override operator fun invoke(org: String, packageName: String, version: String): NpmDependency {
                 return NpmDependency(project, org, packageName, version)
             }
 
+            override fun call(vararg args: Any?): NpmDependency {
+                val size = args.size
+                if (size > 3) throw IllegalArgumentException(
+                    """
+                    Unable to add NPM dependency by $args
+                    - npm('packageName') -> packageName:*
+                    - npm('packageName', 'version') -> packageName:version
+                    - npm('org', 'packageName', 'version') -> org/packageName:version
+                    """.trimIndent()
+                )
+
+                if (size == 3) {
+                    val (org, packageName, version) = args
+                        .map { it as String }
+
+                    return invoke(
+                        org = org,
+                        packageName = packageName,
+                        version = version
+                    )
+                }
+
+                val packageName = args[0] as String
+                val version = if (size > 1) args[1] as String else null
+
+                return if (version != null) {
+                    invoke(
+                        packageName = packageName,
+                        version = version
+                    )
+                } else {
+                    invoke(
+                        packageName = packageName
+                    )
+                }
+            }
         }
 
-        (project.dependencies as ExtensionAware)
+        dependencies
             .extensions
             .add(
-                typeOf<Npm>(npm::class.java),
+                typeOf<Npm>(Npm::class.java),
                 "npm",
                 npm
             )