[Gradle, JS] Back field to delegate

#KT-37582 fixed

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

@@ -169,7 +169,7 @@ open class KotlinBrowserJsIr @Inject constructor(target: KotlinJsIrTarget) :
                     compilation.developmentLinkTask.map { it.outputFile }
                 ).get()
                 it.description = "build webpack ${kind.name.toLowerCase()} bundle"
-                it._destinationDirectory = distribution.directory
+                it.destinationDirectory = distribution.directory!!
 
                 commonWebpackConfigurations.forEach { configure ->
                     it.configure()

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

@@ -195,7 +195,7 @@ open class KotlinBrowserJs @Inject constructor(target: KotlinJsTarget) :
 
                 it.compilation = compilation
                 it.description = "build webpack ${kind.name.toLowerCase()} bundle"
-                it._destinationDirectory = distribution.directory
+                it.destinationDirectory = distribution.directory!!
 
                 when (kind) {
                     BuildVariantKind.PRODUCTION -> {

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

@@ -24,7 +24,6 @@ import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpackConfig.Mode
 import org.jetbrains.kotlin.gradle.testing.internal.reportsDir
 import org.jetbrains.kotlin.gradle.utils.injected
 import org.jetbrains.kotlin.gradle.utils.property
-import org.jetbrains.kotlin.gradle.utils.provider
 import java.io.File
 import javax.inject.Inject
 
@@ -53,11 +52,9 @@ open class KotlinWebpack : DefaultTask(), RequiresNpmDependencies {
     @Input
     var mode: Mode = Mode.DEVELOPMENT
 
-    private var _entry: File? = null
-
     @get:PathSensitive(PathSensitivity.ABSOLUTE)
     @get:InputFile
-    var entry: File by property(::_entry) {
+    var entry: File by property {
         compilation.compileKotlinTask.outputFile
     }
 
@@ -95,17 +92,13 @@ open class KotlinWebpack : DefaultTask(), RequiresNpmDependencies {
         get() = project.convention.plugins["base"] as BasePluginConvention?
 
     @get:Internal
-    internal var _destinationDirectory: File? = null
+    var destinationDirectory: File by property {
-
-    @get:Internal
-    val destinationDirectory: File by provider(::_destinationDirectory) {
         project.buildDir.resolve(baseConventions!!.distsDirName)
     }
-
+        internal set
-    private var _outputFileName: String? = null
 
     @get:Internal
-    var outputFileName: String by property(::_outputFileName) {
+    var outputFileName: String by property {
         baseConventions?.archivesBaseName + ".js"
     }
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/utils/Delegates.kt

@@ -5,33 +5,32 @@
 
 package org.jetbrains.kotlin.gradle.utils
 
-import kotlin.reflect.KMutableProperty
 import kotlin.reflect.KProperty
 
 open class ProviderDelegate<out T : Any>(
-    protected open val backing: KProperty<T?>,
     private val defaultValueProvider: () -> T
 ) {
+    protected open val backing: T? = null
+
     operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
-        return backing.getter.call() ?: defaultValueProvider()
+        return backing ?: defaultValueProvider()
     }
 }
 
 class PropertyDelegate<T : Any>(
-    override val backing: KMutableProperty<T?>,
     defaultValueProvider: () -> T
-) : ProviderDelegate<T>(backing, defaultValueProvider) {
+) : ProviderDelegate<T>(defaultValueProvider) {
+    override var backing: T? = null
+
     operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
-        backing.setter.call(value)
+        backing = value
     }
 }
 
 fun <T : Any> provider(
-    backing: KProperty<T?>,
     defaultValueProvider: () -> T
-): ProviderDelegate<T> = ProviderDelegate(backing, defaultValueProvider)
+): ProviderDelegate<T> = ProviderDelegate(defaultValueProvider)
 
 fun <T : Any> property(
-    backing: KMutableProperty<T?>,
     defaultValueProvider: () -> T
-): PropertyDelegate<T> = PropertyDelegate(backing, defaultValueProvider)
+): PropertyDelegate<T> = PropertyDelegate(defaultValueProvider)