[Gradle, JS] Add all possible values of library target as enums

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

@@ -21,7 +21,6 @@ import org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootPlugin
 import org.jetbrains.kotlin.gradle.targets.js.npm.RequiresNpmDependencies
 import org.jetbrains.kotlin.gradle.targets.js.npm.npmProject
 import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpackConfig.Mode
-import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpackOutput.Companion.UMD
 import org.jetbrains.kotlin.gradle.testing.internal.reportsDir
 import org.jetbrains.kotlin.gradle.utils.injected
 import java.io.File
@@ -79,7 +78,7 @@ open class KotlinWebpack : DefaultTask(), RequiresNpmDependencies {
     @Nested
     val output: KotlinWebpackOutput = KotlinWebpackOutput(
         library = baseConventions?.archivesBaseName,
-        libraryTarget = UMD
+        libraryTarget = KotlinWebpackLibraryTarget.UMD
     )
 
     @get:Internal

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

@@ -6,12 +6,47 @@
 package org.jetbrains.kotlin.gradle.targets.js.webpack
 
 import org.gradle.api.tasks.Input
+import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpackLibraryTarget.Companion.fromString
 
 data class KotlinWebpackOutput(
     @Input var library: String?,
-    @Input var libraryTarget: String?
+    @Input var libraryTarget: KotlinWebpackLibraryTarget?
 ) {
+    fun getLibraryTarget(): String {
+        return this.libraryTarget.toString()
+    }
+
+    fun setLibraryTarget(value: String) {
+        this.libraryTarget = fromString(value)
+    }
+}
+
+enum class KotlinWebpackLibraryTarget {
+    VAR,
+    ASSIGN,
+    THIS,
+    WINDOW,
+    SELF,
+    GLOBAL,
+    COMMONJS,
+    COMMONJS2,
+    COMMONJS_MODULE,
+    AMD,
+    AMD_REQUIRE,
+    UMD,
+    UMD2,
+    JSONP,
+    SYSTEM;
+
+    override fun toString(): String {
+        return super.toString()
+            .toLowerCase()
+            .replace("_", "-")
+    }
+
     companion object {
-        const val UMD = "umd"
+        internal fun fromString(value: String): KotlinWebpackLibraryTarget {
+            return valueOf(value.toUpperCase().replace("-", "_"))
+        }
     }
 }