================
@@ -0,0 +1,47 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef 
LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_REPLACEWITHSTRINGVIEWCHECK_H
+#define 
LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_REPLACEWITHSTRINGVIEWCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::performance {
+
+/// Looks for functions returning `std::[w|u8|u16|u32]string` and suggests to
+/// change it to `std::[...]string_view` if possible and profitable.
+///
+/// Example:
+///
+/// std::string foo(int i) { // <---- can be replaced to std::string_view 
f(...)
+///   switch(i) {
+///     case 1:
+///       return "case1";
+///     case 2:
+///       return "case2";
+///     default:
+///       return {};
+///   }
+/// }
+///
----------------
vbvictor wrote:

```suggestion
```

https://github.com/llvm/llvm-project/pull/172170
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