[Gradle, JS] Output file of public package json as var for changing it

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

@@ -64,12 +64,6 @@ open class NpmProject(val compilation: KotlinJsCompilation) {
     val externalsDir: File
         get() = externalsDirRoot.resolve("src")
 
-    val publicPackageJson: File
-        get() = project.buildDir
-            .resolve("tmp")
-            .resolve(publicPackageJsonTaskName)
-            .resolve(PACKAGE_JSON)
-
     val publicPackageJsonTaskName: String
         get() = compilation.disambiguateName(PublicPackageJsonTask.NAME)
 

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

@@ -11,6 +11,8 @@ import org.gradle.api.tasks.Nested
 import org.gradle.api.tasks.OutputFile
 import org.gradle.api.tasks.TaskAction
 import org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootExtension
+import org.jetbrains.kotlin.gradle.targets.js.npm.NpmProject.Companion.PACKAGE_JSON
+import org.jetbrains.kotlin.gradle.utils.property
 import java.io.File
 import javax.inject.Inject
 
@@ -42,8 +44,12 @@ constructor(
     var skipOnEmptyNpmDependencies: Boolean = false
 
     @get:OutputFile
-    val packageJson: File
-        get() = npmProject.publicPackageJson
+    var packageJson: File by property {
+        project.buildDir
+            .resolve("tmp")
+            .resolve(npmProject.publicPackageJsonTaskName)
+            .resolve(PACKAGE_JSON)
+    }
 
     @TaskAction
     fun resolve() {
@@ -62,7 +68,7 @@ constructor(
 
             packageJson.devDependencies.clear()
 
-            packageJson.saveTo(npmProject.publicPackageJson)
+            packageJson.saveTo(this@PublicPackageJsonTask.packageJson)
         }
     }