Fix tuple name homogeneity check (#40118)

src/compiler/checker.ts

@@ -31080,13 +31080,10 @@ namespace ts {
         function checkTupleType(node: TupleTypeNode) {
             const elementTypes = node.elements;
             let seenOptionalElement = false;
-            let seenNamedElement = false;
+            const hasNamedElement = some(elementTypes, isNamedTupleMember);
             for (let i = 0; i < elementTypes.length; i++) {
                 const e = elementTypes[i];
-                if (e.kind === SyntaxKind.NamedTupleMember) {
-                    seenNamedElement = true;
-                }
-                else if (seenNamedElement) {
+                if (e.kind !== SyntaxKind.NamedTupleMember && hasNamedElement) {
                     grammarErrorOnNode(e, Diagnostics.Tuple_members_must_all_have_names_or_all_not_have_names);
                     break;
                 }