[K/JS] Add file-to-file compilation ^KT-6168 Fixed

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -657,6 +657,13 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
         collector.deprecationWarn(irBaseClassInMetadata, false, "-Xir-base-class-in-metadata")
         collector.deprecationWarn(irNewIr2Js, true, "-Xir-new-ir2js")
 
+        if (irPerFile && moduleKind != MODULE_ES) {
+            collector.report(
+                CompilerMessageSeverity.ERROR,
+                "Per-file compilation can't be used with any `moduleKind` except `es` (ECMAScript Modules)"
+            )
+        }
+
         return super.configureAnalysisFlags(collector, languageVersion).also {
             it[allowFullyQualifiedNameInKClass] = wasm && wasmKClassFqn //Only enabled WASM BE supports this flag
         }

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JsArgumentConstants.java

@@ -26,6 +26,10 @@ public interface K2JsArgumentConstants {
     String MODULE_UMD = "umd";
     String MODULE_ES = "es";
 
+    String GRANULARITY_WHOLE_PROGRAM = "whole-program";
+    String GRANULARITY_PER_MODULE = "per-module";
+    String GRANULARITY_PER_FILE = "per-file";
+
     String SOURCE_MAP_SOURCE_CONTENT_ALWAYS = "always";
     String SOURCE_MAP_SOURCE_CONTENT_NEVER = "never";
     String SOURCE_MAP_SOURCE_CONTENT_INLINING = "inlining";