HL API: Add type parameters and visibility to KtTypeAliasSymbol.

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/KtClassLikeSymbol.kt

@@ -32,7 +32,10 @@ public sealed class KtClassLikeSymbol : KtClassifierSymbol(), KtSymbolWithKind {
     abstract override fun createPointer(): KtSymbolPointer<KtClassLikeSymbol>
 }
 
-public abstract class KtTypeAliasSymbol : KtClassLikeSymbol(), KtNamedSymbol {
+public abstract class KtTypeAliasSymbol : KtClassLikeSymbol(),
+    KtSymbolWithTypeParameters,
+    KtSymbolWithVisibility,
+    KtNamedSymbol {
     final override val symbolKind: KtSymbolKind get() = KtSymbolKind.TOP_LEVEL
 
     /**

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/symbols/KtFirTypeAliasSymbol.kt

@@ -6,8 +6,12 @@
 package org.jetbrains.kotlin.idea.frontend.api.fir.symbols
 
 import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.descriptors.Visibilities
+import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
 import org.jetbrains.kotlin.fir.declarations.FirTypeAlias
+import org.jetbrains.kotlin.fir.declarations.FirTypeParameter
+import org.jetbrains.kotlin.fir.declarations.utils.isLocal
 import org.jetbrains.kotlin.idea.fir.findPsi
 import org.jetbrains.kotlin.idea.fir.low.level.api.api.FirModuleResolveState
 import org.jetbrains.kotlin.idea.frontend.api.fir.KtSymbolByFirBuilder
@@ -34,6 +38,18 @@ internal class KtFirTypeAliasSymbol(
     override val name: Name get() = firRef.withFir { it.name }
     override val classIdIfNonLocal: ClassId get() = firRef.withFir { it.symbol.classId }
 
+    override val visibility: Visibility
+        get() = when (val possiblyRawVisibility = getVisibility(FirResolvePhase.RAW_FIR)) {
+            Visibilities.Unknown -> Visibilities.Public
+            else -> possiblyRawVisibility
+        }
+
+    override val typeParameters by firRef.withFirAndCache { fir ->
+        fir.typeParameters.filterIsInstance<FirTypeParameter>().map { typeParameter ->
+            builder.classifierBuilder.buildTypeParameterSymbol(typeParameter.symbol.fir)
+        }
+    }
+
     override val expandedType: KtType by firRef.withFirAndCache(FirResolvePhase.SUPER_TYPES) { fir ->
         builder.typeBuilder.buildKtType(fir.expandedTypeRef)
     }

idea/idea-frontend-fir/testData/symbols/symbolByPsi/typeAlias.kt

@@ -1,3 +1,3 @@
 class X<T>
 
-typealias Y<Z> = X<Z>
+private typealias Y<Z> = X<Z>

idea/idea-frontend-fir/testData/symbols/symbolByPsi/typeAlias.txt

@@ -48,4 +48,8 @@ KtFirTypeAliasSymbol:
   name: Y
   origin: SOURCE
   symbolKind: TOP_LEVEL
+  typeParameters: [
+    KtFirTypeParameterSymbol(Z)
+  ]
+  visibility: Private
   deprecationStatus: null