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diff --git a/js/src/frontend/FoldConstants.h b/js/src/frontend/FoldConstants.h
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+++ b/js/src/frontend/FoldConstants.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef frontend_FoldConstants_h
+#define frontend_FoldConstants_h
+
+#include "frontend/SyntaxParseHandler.h"
+
+namespace js {
+
+class FrontendContext;
+
+namespace frontend {
+
+class FullParseHandler;
+template <class ParseHandler>
+class PerHandlerParser;
+class ParserAtomsTable;
+
+// Perform constant folding on the given AST. For example, the program
+// `print(2 + 2)` would become `print(4)`.
+//
+// pnp is the address of a pointer variable that points to the root node of the
+// AST. On success, *pnp points to the root node of the new tree, which may be
+// the same node (unchanged or modified in place) or a new node.
+//
+// Usage:
+//    MOZ_TRY_VAR(pn, parser->statement());
+//    if (!FoldConstants(fc, parserAtoms, &pn, parser)) {
+//        return errorResult();
+//    }
+[[nodiscard]] extern bool FoldConstants(FrontendContext* fc,
+                                        ParserAtomsTable& parserAtoms,
+                                        ParseNode** pnp,
+                                        FullParseHandler* handler);
+
+[[nodiscard]] inline bool FoldConstants(FrontendContext* fc,
+                                        ParserAtomsTable& parserAtoms,
+                                        typename SyntaxParseHandler::Node* pnp,
+                                        SyntaxParseHandler* handler) {
+  return true;
+}
+
+} /* namespace frontend */
+} /* namespace js */
+
+#endif /* frontend_FoldConstants_h */