Allow export declaration to reference const enums

Author: EvanCahill

src/compiler/checker.ts

@@ -27464,7 +27464,7 @@ namespace ts {
                 (node.parent.kind === SyntaxKind.ElementAccessExpression && (<ElementAccessExpression>node.parent).expression === node) ||
                 ((node.kind === SyntaxKind.Identifier || node.kind === SyntaxKind.QualifiedName) && isInRightSideOfImportOrExportAssignment(<Identifier>node) ||
                     (node.parent.kind === SyntaxKind.TypeQuery && (<TypeQueryNode>node.parent).exprName === node)) ||
-                (node.parent.kind === SyntaxKind.ExportSpecifier && (compilerOptions.preserveConstEnums || node.flags & NodeFlags.Ambient)); // We allow reexporting const enums
+                (node.parent.kind === SyntaxKind.ExportSpecifier); // We allow reexporting const enums
 
             if (!ok) {
                 error(node, Diagnostics.const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query);