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diff --git a/clang-tools-extra/clangd/Format.h b/clang-tools-extra/clangd/Format.h
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+//===--- Format.h - automatic code formatting ---------------*- C++-*------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Clangd uses clang-format for formatting operations.
+// This file adapts it to support new scenarios like format-on-type.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_FORMAT_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_FORMAT_H
+
+#include "Protocol.h"
+#include "clang/Format/Format.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+namespace clangd {
+
+/// Applies limited formatting around new \p InsertedText.
+/// The \p Code already contains the updated text before \p Cursor, and may have
+/// had additional / characters (such as indentation) inserted by the editor.
+///
+/// Example breaking a line (^ is the cursor):
+/// === before newline is typed ===
+/// if(1){^}
+/// === after newline is typed and editor indents ===
+/// if(1){
+///   ^}
+/// === after formatIncremental(InsertedText="\n") ===
+/// if (1) {
+///   ^
+/// }
+///
+/// We return sorted vector<tooling::Replacement>, not tooling::Replacements!
+/// We may insert text both before and after the cursor. tooling::Replacements
+/// would merge these, and thus lose information about cursor position.
+std::vector<tooling::Replacement>
+formatIncremental(llvm::StringRef Code, unsigned Cursor,
+                  llvm::StringRef InsertedText, format::FormatStyle Style);
+
+/// Determine the new cursor position after applying \p Replacements.
+/// Analogue of tooling::Replacements::getShiftedCodePosition().
+unsigned
+transformCursorPosition(unsigned Offset,
+                        const std::vector<tooling::Replacement> &Replacements);
+
+} // namespace clangd
+} // namespace clang
+
+#endif
+