Revert "Avoid check for union keys"

This reverts commit d7a7297.

Author: Kingwl

src/compiler/checker.ts

@@ -13274,13 +13274,13 @@ namespace ts {
                         undefined;
         }
 
-        function getPropertyTypeForIndexType(originalObjectType: Type, objectType: Type, indexType: Type, fullIndexType: Type, suppressNoImplicitAnyError: boolean, accessNode: ElementAccessExpression | IndexedAccessTypeNode | PropertyName | BindingName | SyntheticExpression | undefined, accessFlags: AccessFlags, reportDeprecated?: boolean) {
+        function getPropertyTypeForIndexType(originalObjectType: Type, objectType: Type, indexType: Type, fullIndexType: Type, suppressNoImplicitAnyError: boolean, accessNode: ElementAccessExpression | IndexedAccessTypeNode | PropertyName | BindingName | SyntheticExpression | undefined, accessFlags: AccessFlags) {
             const accessExpression = accessNode && accessNode.kind === SyntaxKind.ElementAccessExpression ? accessNode : undefined;
             const propName = accessNode && isPrivateIdentifier(accessNode) ? undefined : getPropertyNameFromIndex(indexType, accessNode);
             if (propName !== undefined) {
                 const prop = getPropertyOfType(objectType, propName);
                 if (prop) {
-                    if (reportDeprecated && accessNode && prop.flags & SymbolFlags.Deprecated) {
+                    if (accessNode && prop.flags & SymbolFlags.Deprecated) {
                         if (getDeprecatedFlags(prop) & (DeprecatedFlags.Type | DeprecatedFlags.Value)) {
                             const deprecatedNode = accessExpression?.argumentExpression ?? (isIndexedAccessTypeNode(accessNode) ? accessNode.indexType : accessNode);
                             errorOrSuggestion(/* isError */ false, deprecatedNode, Diagnostics._0_is_deprecated, propName as string);
@@ -13652,7 +13652,7 @@ namespace ts {
                 }
                 return accessFlags & AccessFlags.Writing ? getIntersectionType(propTypes, aliasSymbol, aliasTypeArguments) : getUnionType(propTypes, UnionReduction.Literal, aliasSymbol, aliasTypeArguments);
             }
-            return getPropertyTypeForIndexType(objectType, apparentObjectType, indexType, indexType, /* supressNoImplicitAnyError */ false, accessNode, accessFlags | AccessFlags.CacheSymbol, /* reportDeprecated */ true);
+            return getPropertyTypeForIndexType(objectType, apparentObjectType, indexType, indexType, /* supressNoImplicitAnyError */ false, accessNode, accessFlags | AccessFlags.CacheSymbol);
         }
 
         function getTypeFromIndexedAccessTypeNode(node: IndexedAccessTypeNode) {