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diff --git a/indra/newview/llluamanager.h b/indra/newview/llluamanager.h
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+/**
+ * @file llluamanager.h
+ * @brief classes and functions for interfacing with LUA.
+ *
+ * $LicenseInfo:firstyear=2023&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2023, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLLUAMANAGER_H
+#define LL_LLLUAMANAGER_H
+
+#include "fsyspath.h"
+#include "llcoros.h"
+#include "llsd.h"
+#include <functional>
+#include <string>
+#include <utility>                  // std::pair
+
+#include "luau/lua.h"
+#include "luau/lualib.h"
+
+class LuaState;
+
+class LLLUAmanager
+{
+    friend class ScriptObserver;
+
+public:
+    // Pass a callback with this signature to obtain the error message, if
+    // any, from running a script or source string. Empty msg means success.
+    typedef std::function<void(std::string msg)> script_finished_fn;
+    // Pass a callback with this signature to obtain the result, if any, of
+    // running a script or source string.
+    // count <  0 means error, and result.asString() is the error message.
+    // count == 0 with result.isUndefined() means the script returned no results.
+    // count == 1 means the script returned one result.
+    // count >  1 with result.isArray() means the script returned multiple
+    //            results, represented as the entries of the result array.
+    typedef std::function<void(int count, const LLSD& result)> script_result_fn;
+    // same semantics as script_result_fn parameters
+    typedef std::pair<int, LLSD> script_result;
+
+    static void runScriptFile(const std::string &filename, bool autorun = false, script_result_fn result_cb = {},
+                              script_finished_fn finished_cb = {});
+    // Start running a Lua script file, returning an LLCoros::Future whose
+    // get() method will pause the calling coroutine until it can deliver the
+    // (count, result) pair described above. Between startScriptFile() and
+    // Future::get(), the caller and the Lua script coroutine will run
+    // concurrently.
+    static LLCoros::Future<script_result> startScriptFile(const std::string& filename);
+    // Run a Lua script file, and pause the calling coroutine until it completes.
+    // The return value is the (count, result) pair described above.
+    static script_result waitScriptFile(const std::string& filename);
+
+    static void runScriptLine(const std::string &chunk, script_result_fn result_cb = {},
+                              script_finished_fn finished_cb = {});
+    // Start running a Lua chunk, returning an LLCoros::Future whose
+    // get() method will pause the calling coroutine until it can deliver the
+    // (count, result) pair described above. Between startScriptLine() and
+    // Future::get(), the caller and the Lua script coroutine will run
+    // concurrently.
+    static LLCoros::Future<script_result> startScriptLine(const std::string& chunk);
+    // Run a Lua chunk, and pause the calling coroutine until it completes.
+    // The return value is the (count, result) pair described above.
+    static script_result waitScriptLine(const std::string& chunk);
+
+    static const std::map<std::string, std::string> getScriptNames() { return sScriptNames; }
+
+    static S32 sAutorunScriptCount;
+    static S32 sScriptCount;
+
+ private:
+   static std::map<std::string, std::string> sScriptNames;
+};
+
+class LLRequireResolver
+{
+ public:
+    static void resolveRequire(lua_State *L, std::string path);
+
+ private:
+    fsyspath mPathToResolve;
+    fsyspath mSourceDir;
+
+    LLRequireResolver(lua_State *L, const std::string& path);
+
+    void findModule();
+    lua_State *L;
+
+    bool findModuleImpl(const std::string& absolutePath);
+    void runModule(const std::string& desc, const std::string& code);
+};
+
+// RAII class to guarantee that a script entry is erased even when coro is terminated
+class ScriptObserver
+{
+  public:
+    ScriptObserver(const std::string &coro_name, const std::string &filename) : mCoroName(coro_name)
+    {
+        LLLUAmanager::sScriptNames[mCoroName] = filename;
+    }
+    ~ScriptObserver() { LLLUAmanager::sScriptNames.erase(mCoroName); }
+
+  private:
+    std::string mCoroName;
+};
+#endif