Override error about using JS legacy compiler

JetBrains/kotlin@f9cbd57

Author: 3flex

core/src/main/kotlin/com/tschuchort/compiletesting/KotlinJsCompilation.kt

@@ -33,6 +33,9 @@ class KotlinJsCompilation : AbstractKotlinCompilation<K2JSCompilerArguments>() {
   /** Specify a compilation module name for IR backend */
   var irModuleName: String? = null
 
+  /** Use deprecated legacy compiler without error */
+  var useDeprecatedLegacyCompiler: Boolean = false
+
   /**
    * Path to the kotlin-stdlib-js.jar
    * If none is given, it will be searched for in the host
@@ -88,6 +91,7 @@ class KotlinJsCompilation : AbstractKotlinCompilation<K2JSCompilerArguments>() {
     args.irOnly = irOnly
     args.irModuleName = irModuleName
     args.generateDts = generateDts
+    args.useDeprecatedLegacyCompiler = useDeprecatedLegacyCompiler
   }
 
   /** Runs the compilation task */

core/src/test/kotlin/com/tschuchort/compiletesting/TestUtils.kt

@@ -15,11 +15,12 @@ fun defaultCompilerConfig(): KotlinCompilation {
 }
 
 fun defaultJsCompilerConfig(): KotlinJsCompilation {
-    return KotlinJsCompilation( ).apply {
+    return KotlinJsCompilation().apply {
         inheritClassPath = false
         verbose = true
         reportOutputFiles = false
         messageOutputStream = System.out
+        useDeprecatedLegacyCompiler = true
     }
 }