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diff --git a/include/lib/ArduinoJson/Variant/VariantTo.hpp b/include/lib/ArduinoJson/Variant/VariantTo.hpp
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+++ b/include/lib/ArduinoJson/Variant/VariantTo.hpp
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+// ArduinoJson - https://arduinojson.org
+// Copyright Benoit Blanchon 2014-2021
+// MIT License
+
+#pragma once
+
+#include <ArduinoJson/Namespace.hpp>
+
+namespace ARDUINOJSON_NAMESPACE {
+class ArrayRef;
+class ObjectRef;
+class VariantRef;
+
+// A metafunction that returns the type of the value returned by
+// VariantRef::to<T>()
+template <typename T>
+struct VariantTo {};
+
+template <>
+struct VariantTo<ArrayRef> {
+ typedef ArrayRef type;
+};
+template <>
+struct VariantTo<ObjectRef> {
+ typedef ObjectRef type;
+};
+template <>
+struct VariantTo<VariantRef> {
+ typedef VariantRef type;
+};
+
+} // namespace ARDUINOJSON_NAMESPACE