CLI K2: report an error for JS/Native/Metadata #KT-52035 Fixed

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java

@@ -172,6 +172,10 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments> {
             @Nullable KotlinPaths paths
     ) {
         MessageCollector messageCollector = configuration.getNotNull(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY);
+        if (configuration.getBoolean(CommonConfigurationKeys.USE_FIR)) {
+            messageCollector.report(ERROR, "K2 does not support JS target right now", null);
+            return ExitCode.COMPILATION_ERROR;
+        }
 
         ExitCode exitCode = OK;
 

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -87,6 +87,10 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
         paths: KotlinPaths?
     ): ExitCode {
         val messageCollector = configuration.getNotNull(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY)
+        if (configuration.getBoolean(CommonConfigurationKeys.USE_FIR)) {
+            messageCollector.report(ERROR, "K2 does not support JS target right now")
+            return ExitCode.COMPILATION_ERROR
+        }
 
         val pluginLoadResult = loadPlugins(paths, arguments, configuration)
         if (pluginLoadResult != ExitCode.OK) return pluginLoadResult