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diff --git a/clang-tools-extra/clangd/index/IndexAction.h b/clang-tools-extra/clangd/index/IndexAction.h
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+++ b/clang-tools-extra/clangd/index/IndexAction.h
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+//===--- IndexAction.h - Run the indexer as a frontend action ----*- C++-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_INDEX_ACTION_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_INDEX_ACTION_H
+#include "SymbolCollector.h"
+#include "clang/Frontend/FrontendActions.h"
+
+namespace clang {
+namespace clangd {
+
+// Creates an action that indexes translation units and delivers the results
+// for SymbolsCallback (each slab corresponds to one TU).
+//
+// Only a subset of SymbolCollector::Options are respected:
+//   - include paths are always collected, and canonicalized appropriately
+//   - references are always counted
+//   - the symbol origin is always Static
+std::unique_ptr<FrontendAction>
+createStaticIndexingAction(SymbolCollector::Options Opts,
+                           std::function<void(SymbolSlab)> SymbolsCallback);
+
+} // namespace clangd
+} // namespace clang
+
+#endif