[Gradle, JS] Check only once set producing type

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

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.targets.js
+
+enum class KotlinJsProducingType {
+    KOTLIN_LIBRARY,
+    EXECUTABLE
+}

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

@@ -69,6 +69,8 @@ constructor(
         }
     }
 
+    var producingType: KotlinJsProducingType? = null
+
     var irTarget: KotlinJsIrTarget? = null
 
     val testTaskName get() = testRuns.getByName(KotlinTargetWithTests.DEFAULT_TEST_RUN_NAME).testTaskName
@@ -124,18 +126,27 @@ constructor(
     }
 
     override fun produceKotlinLibrary() {
-        produce {
+        produce(KotlinJsProducingType.KOTLIN_LIBRARY) {
             produceKotlinLibrary()
         }
     }
 
     override fun produceExecutable() {
-        produce {
+        produce(KotlinJsProducingType.EXECUTABLE) {
             produceExecutable()
         }
     }
 
-    private fun produce(producer: KotlinJsSubTarget.() -> Unit) {
+    private fun produce(
+        producingType: KotlinJsProducingType,
+        producer: KotlinJsSubTarget.() -> Unit
+    ) {
+        check(this.producingType == null || this.producingType == producingType) {
+            "Only one producing type supported. Try to set $producingType but previously ${this.producingType} found"
+        }
+
+        this.producingType = producingType
+
         whenBrowserConfigured {
             (this as KotlinJsSubTarget).producer()
         }

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

@@ -14,6 +14,7 @@ import org.jetbrains.kotlin.gradle.plugin.KotlinTargetWithTests
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinOnlyTarget
 import org.jetbrains.kotlin.gradle.targets.js.JsIrAggregatingExecutionSource
 import org.jetbrains.kotlin.gradle.targets.js.KotlinJsIrReportAggregatingTestRun
+import org.jetbrains.kotlin.gradle.targets.js.KotlinJsProducingType
 import org.jetbrains.kotlin.gradle.targets.js.dsl.KotlinJsIrBrowserDsl
 import org.jetbrains.kotlin.gradle.targets.js.dsl.KotlinJsIrNodeDsl
 import org.jetbrains.kotlin.gradle.targets.js.dsl.KotlinJsIrTargetDsl
@@ -31,6 +32,8 @@ open class KotlinJsIrTarget @Inject constructor(project: Project, platformType:
     override lateinit var testRuns: NamedDomainObjectContainer<KotlinJsIrReportAggregatingTestRun>
         internal set
 
+    var producingType: KotlinJsProducingType? = null
+
     val testTaskName get() = testRuns.getByName(KotlinTargetWithTests.DEFAULT_TEST_RUN_NAME).testTaskName
     val testTask: TaskProvider<KotlinTestReport>
         get() = checkNotNull(project.locateTask(testTaskName))
@@ -83,18 +86,27 @@ open class KotlinJsIrTarget @Inject constructor(project: Project, platformType:
     }
 
     override fun produceKotlinLibrary() {
-        produce {
+        produce(KotlinJsProducingType.KOTLIN_LIBRARY) {
             produceKotlinLibrary()
         }
     }
 
     override fun produceExecutable() {
-        produce {
+        produce(KotlinJsProducingType.EXECUTABLE) {
             produceExecutable()
         }
     }
 
-    private fun produce(producer: KotlinJsSubTarget.() -> Unit) {
+    private fun produce(
+        producingType: KotlinJsProducingType,
+        producer: KotlinJsSubTarget.() -> Unit
+    ) {
+        check(this.producingType == null || this.producingType == producingType) {
+            "Only one producing type supported. Try to set $producingType but previously ${this.producingType} found"
+        }
+
+        this.producingType = producingType
+
         whenBrowserConfigured {
             (this as KotlinJsSubTarget).producer()
         }