[Gradle, JS] DCE and minimized names could be falsify

[Gradle, JS] Add test on falsify compiler flags

[Gradle, JS] DCE and minimized names could be falsify

Merge-request: KT-MR-6167
Merged-by: Ilya Goncharov <Ilya.Goncharov@jetbrains.com>

^KT-51957 fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -219,6 +219,38 @@ class Kotlin2JsIrGradlePluginIT : AbstractKotlin2JsGradlePluginIT(true) {
             }
         }
     }
+
+    @DisplayName("falsify kotlin js compiler args")
+    @GradleTest
+    fun testFalsifyKotlinJsCompilerArgs(gradleVersion: GradleVersion) {
+        project("simple-js-executable", gradleVersion) {
+            buildGradleKts.appendText(
+                """
+                |
+                |tasks.named<org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrLink>("compileProductionExecutableKotlinJs").configure {
+                |    kotlinOptions {
+                |        freeCompilerArgs += "-Xir-dce=false"
+                |        freeCompilerArgs += "-Xir-minimized-member-names=false"
+                |    }
+                |    
+                |    doLast {
+                |        kotlinOptions {
+                |            if (freeCompilerArgs.single { it.startsWith("-Xir-dce") } != "-Xir-dce=false") throw GradleException("fail1")
+                |            if (
+                |            freeCompilerArgs
+                |                .single { it.startsWith("-Xir-minimized-member-names") } != "-Xir-minimized-member-names=false"
+                |            ) throw GradleException("fail2")
+                |        }
+                |    }
+                |}
+               """.trimMargin()
+            )
+
+            build("build") {
+                assertFileInProjectNotExists("build/js/packages/kotlin-js-nodejs/kotlin/")
+            }
+        }
+    }
 }
 
 @JsGradlePluginTests

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/simple-js-executable/build.gradle.kts

@@ -0,0 +1,18 @@
+plugins {
+    kotlin("js")
+}
+
+group = "com.example"
+version = "1.0"
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+kotlin {
+    js {
+        binaries.executable()
+        nodejs()
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/simple-js-executable/settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "js-executable"

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/simple-js-executable/src/main/kotlin/Main.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2019 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 com.example
+
+fun main() {
+    println("Hello, Yarn")
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/simple-js-executable/src/main/resources/main.js

@@ -0,0 +1 @@
+console.log("hello")

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrLink.kt

@@ -179,7 +179,12 @@ abstract class KotlinJsIrLink @Inject constructor(
     }
 
     private fun KotlinJsOptions.configureOptions(vararg additionalCompilerArgs: String) {
-        freeCompilerArgs += additionalCompilerArgs.toList() +
+        freeCompilerArgs += additionalCompilerArgs
+            .mapNotNull { arg ->
+                if (kotlinOptions.freeCompilerArgs
+                        .any { it.startsWith(arg) }
+                ) null else arg
+            } +
                 PRODUCE_JS +
                 "$ENTRY_IR_MODULE=${entryModule.get().asFile.canonicalPath}"