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diff --git a/src/searchindex_js.h b/src/searchindex_js.h
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+/******************************************************************************
+ *
+ * Copyright (C) 1997-2022 by Dimitri van Heesch.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation under the terms of the GNU General Public License is hereby
+ * granted. No representations are made about the suitability of this software
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ * See the GNU General Public License for more details.
+ *
+ * Documents produced by Doxygen are derivative works derived from the
+ * input used in their production; they are not affected by this license.
+ *
+ */
+
+/** @file
+ *  @brief Javascript based search engine.
+ */
+
+#ifndef SEARCHINDEX_JS_H
+#define SEARCHINDEX_JS_H
+
+#include <array>
+#include <vector>
+#include <map>
+#include <string>
+#include <functional>
+
+#include "qcstring.h"
+
+#define NUM_SEARCH_INDICES 21
+
+class Definition;
+
+QCString searchId(const Definition *d);
+QCString searchName(const Definition *d);
+
+using SearchIndexList = std::vector<const Definition *>;
+using SearchIndexMap  = std::map<std::string,SearchIndexList>;
+
+struct SearchIndexInfo
+{
+  void add(const std::string &letter,const Definition *def);
+  QCString name;
+  std::function<QCString()> getText;
+  SearchIndexMap symbolMap;
+};
+
+void createJavaScriptSearchIndex();
+void writeJavaScriptSearchIndex();
+const std::array<SearchIndexInfo,NUM_SEARCH_INDICES> &getSearchIndices();
+
+#endif