[JS IR] make using the original parameter names possible

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFileToJsTransformer.kt

@@ -12,12 +12,13 @@ import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
 import org.jetbrains.kotlin.js.backend.ast.JsBlock
 import org.jetbrains.kotlin.js.backend.ast.JsGlobalBlock
 
-class IrFileToJsTransformer : BaseIrElementToJsNodeTransformer<JsBlock, JsStaticContext> {
+class IrFileToJsTransformer(private val useBareParameterNames: Boolean = false) : BaseIrElementToJsNodeTransformer<JsBlock, JsStaticContext> {
     override fun visitFile(declaration: IrFile, data: JsStaticContext): JsBlock {
         val fileContext = JsGenerationContext(
             currentFile = declaration,
             currentFunction = null,
             staticContext = data,
+            useBareParameterNames = useBareParameterNames
         )
         val block = JsGlobalBlock()
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt

@@ -10,11 +10,8 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrLoop
 import org.jetbrains.kotlin.ir.expressions.IrReturnableBlock
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
-import org.jetbrains.kotlin.ir.util.isSuspend
 import org.jetbrains.kotlin.js.backend.ast.JsName
-import org.jetbrains.kotlin.js.backend.ast.JsNameRef
 import org.jetbrains.kotlin.js.backend.ast.JsScope
-import org.jetbrains.kotlin.js.backend.ast.JsThisRef
 
 val emptyScope: JsScope
     get() = object : JsScope("nil") {
@@ -28,7 +25,8 @@ class JsGenerationContext(
     val currentFunction: IrFunction?,
     val staticContext: JsStaticContext,
     val localNames: LocalNameGenerator? = null,
-    private val nameCache: MutableMap<IrElement, JsName> = mutableMapOf()
+    private val nameCache: MutableMap<IrElement, JsName> = mutableMapOf(),
+    private val useBareParameterNames: Boolean = false,
 ): IrNamer by staticContext {
     fun newFile(file: IrFile, func: IrFunction? = null, localNames: LocalNameGenerator? = null): JsGenerationContext {
         return JsGenerationContext(
@@ -37,6 +35,7 @@ class JsGenerationContext(
             staticContext = staticContext,
             localNames = localNames,
             nameCache = nameCache,
+            useBareParameterNames = useBareParameterNames,
         )
     }
 
@@ -47,14 +46,19 @@ class JsGenerationContext(
             staticContext = staticContext,
             localNames = localNames,
             nameCache = nameCache,
+            useBareParameterNames = useBareParameterNames,
         )
     }
 
     fun getNameForValueDeclaration(declaration: IrDeclarationWithName): JsName {
         return nameCache.getOrPut(declaration) {
-            val name = localNames!!.variableNames.names[declaration]
-                ?: error("Variable name is not found ${declaration.name}")
-            JsName(name, true)
+            if (useBareParameterNames) {
+                JsName(sanitizeName(declaration.name.asString()), true)
+            } else {
+                val name = localNames!!.variableNames.names[declaration]
+                    ?: error("Variable name is not found ${declaration.name}")
+                JsName(name, true)
+            }
         }
     }