[JS FIR] Do not verify typealias JS name

Since typealiases are not present in the generated JS code,
there is no need to verify their JS names.

^KT-64463 Fixed

compiler/fir/checkers/checkers.js/src/org/jetbrains/kotlin/fir/analysis/js/checkers/FirJsStableName.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.fir.analysis.js.checkers
 import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.analysis.checkers.getContainingClassSymbol
+import org.jetbrains.kotlin.fir.declarations.FirTypeAlias
 import org.jetbrains.kotlin.fir.declarations.utils.*
 import org.jetbrains.kotlin.fir.symbols.FirBasedSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.*
@@ -47,6 +48,10 @@ internal data class FirJsStableName(
             when (symbol) {
                 is FirConstructorSymbol -> return null
                 is FirPropertyAccessorSymbol -> return null
+                // Skip type aliases since they cannot be external, cannot be exported to JavaScript, and cannot be marked with @JsName.
+                // Furthermore, in the generated JavaScript code, all type alias declarations are removed,
+                // and their usages are replaced with the aliased types.
+                is FirTypeAliasSymbol -> return null
             }
 
             val hasStableNameInJavaScript = when {

compiler/fir/checkers/checkers.js/src/org/jetbrains/kotlin/fir/analysis/js/checkers/declaration/FirJsNameClashFileTopLevelDeclarationsChecker.kt

@@ -34,12 +34,6 @@ object FirJsNameClashFileTopLevelDeclarationsChecker : FirFileChecker() {
     override fun check(declaration: FirFile, context: CheckerContext, reporter: DiagnosticReporter) {
         val topLevelDeclarationsWithStableName = mutableMapOf<String, MutableList<FirJsStableName>>()
         for (topLevelDeclaration in declaration.declarations) {
-            if (topLevelDeclaration is FirTypeAlias) {
-                // Skip type aliases since they cannot be external, cannot be exported to JavaScript, and cannot be marked with @JsName.
-                // Furthermore, in the generated JavaScript code, all type alias declarations are removed,
-                // and their usages are replaced with the aliased types.
-                continue
-            }
             topLevelDeclarationsWithStableName.addStableName(topLevelDeclaration.symbol, context)
             if (topLevelDeclaration is FirClass) {
                 for (classConstructor in topLevelDeclaration.constructors(context.session)) {