[Gradle, JS] Install dukat only if there is dependency with generateExternals

^KT-46178 fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/DukatIntegrationIT.kt

@@ -5,10 +5,14 @@
 
 package org.jetbrains.kotlin.gradle
 
+import com.google.gson.Gson
 import org.gradle.api.logging.configuration.WarningMode
 import org.jetbrains.kotlin.gradle.targets.js.dukat.ExternalsOutputFormat
+import org.jetbrains.kotlin.gradle.targets.js.npm.NpmProject
+import org.jetbrains.kotlin.gradle.targets.js.npm.PackageJson
 import org.jetbrains.kotlin.gradle.util.modify
 import org.junit.Test
+import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 
 class DukatIntegrationIT : BaseGradleIT() {
@@ -397,6 +401,32 @@ class DukatIntegrationIT : BaseGradleIT() {
         }
     }
 
+    @Test
+    fun testWithoutGenerateExternals() {
+        val projectName = "without-generate-externals"
+        val project = Project(
+            projectName = projectName,
+            directoryPrefix = "dukat-integration"
+        )
+        project.setupWorkingDir()
+
+        project.gradleBuildScript().modify(::transformBuildScriptWithPluginsDsl)
+
+        project.build("assemble", options = defaultBuildOptions().copy(warningMode = WarningMode.Summary)) {
+            assertSuccessful()
+
+            assertTasksNotExecuted(":generateExternalsIntegrated")
+
+            assertFalse("Dukat don't need to be dependency for thus project") {
+                fileInWorkingDir("build/js/packages/without-generate-externals")
+                    .resolve(NpmProject.PACKAGE_JSON)
+                    .let {
+                        Gson().fromJson(it.readText(), PackageJson::class.java)
+                    }.dependencies.containsKey("dukat")
+            }
+        }
+    }
+
     private fun projectName(
         dslType: DslType,
         dependenciesLocation: DependenciesLocation

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/dukat-integration/without-generate-externals/build.gradle.kts

@@ -0,0 +1,21 @@
+plugins {
+    kotlin("js") version "<pluginMarkerVersion>"
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    implementation(kotlin("stdlib-js"))
+    implementation(npm("left-pad", "1.3.0"))
+    implementation(npm("decamelize", "4.0.0"))
+}
+
+kotlin {
+    js {
+        useCommonJs()
+        nodejs()
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/dukat-integration/without-generate-externals/settings.gradle.kts

@@ -0,0 +1,6 @@
+pluginManagement {
+    repositories {
+        mavenLocal()
+        gradlePluginPortal()
+    }
+}