Index: trip-planner-front/node_modules/node-addon-api/napi-inl.h
===================================================================
--- trip-planner-front/node_modules/node-addon-api/napi-inl.h	(revision e29cc2ea91f8c99a4329f6d20188305dfd752279)
+++ trip-planner-front/node_modules/node-addon-api/napi-inl.h	(revision e29cc2ea91f8c99a4329f6d20188305dfd752279)
@@ -0,0 +1,5671 @@
+#ifndef SRC_NAPI_INL_H_
+#define SRC_NAPI_INL_H_
+
+////////////////////////////////////////////////////////////////////////////////
+// Node-API C++ Wrapper Classes
+//
+// Inline header-only implementations for "Node-API" ABI-stable C APIs for
+// Node.js.
+////////////////////////////////////////////////////////////////////////////////
+
+// Note: Do not include this file directly! Include "napi.h" instead.
+
+#include <algorithm>
+#include <cstring>
+#include <mutex>
+#include <type_traits>
+
+namespace Napi {
+
+// Helpers to handle functions exposed from C++.
+namespace details {
+
+// Attach a data item to an object and delete it when the object gets
+// garbage-collected.
+// TODO: Replace this code with `napi_add_finalizer()` whenever it becomes
+// available on all supported versions of Node.js.
+template <typename FreeType>
+static inline napi_status AttachData(napi_env env,
+                                     napi_value obj,
+                                     FreeType* data,
+                                     napi_finalize finalizer = nullptr,
+                                     void* hint = nullptr) {
+  napi_status status;
+  if (finalizer == nullptr) {
+    finalizer = [](napi_env /*env*/, void* data, void* /*hint*/) {
+      delete static_cast<FreeType*>(data);
+    };
+  }
+#if (NAPI_VERSION < 5)
+  napi_value symbol, external;
+  status = napi_create_symbol(env, nullptr, &symbol);
+  if (status == napi_ok) {
+    status = napi_create_external(env,
+                              data,
+                              finalizer,
+                              hint,
+                              &external);
+    if (status == napi_ok) {
+      napi_property_descriptor desc = {
+        nullptr,
+        symbol,
+        nullptr,
+        nullptr,
+        nullptr,
+        external,
+        napi_default,
+        nullptr
+      };
+      status = napi_define_properties(env, obj, 1, &desc);
+    }
+  }
+#else  // NAPI_VERSION >= 5
+  status = napi_add_finalizer(env, obj, data, finalizer, hint, nullptr);
+#endif
+  return status;
+}
+
+// For use in JS to C++ callback wrappers to catch any Napi::Error exceptions
+// and rethrow them as JavaScript exceptions before returning from the callback.
+template <typename Callable>
+inline napi_value WrapCallback(Callable callback) {
+#ifdef NAPI_CPP_EXCEPTIONS
+  try {
+    return callback();
+  } catch (const Error& e) {
+    e.ThrowAsJavaScriptException();
+    return nullptr;
+  }
+#else // NAPI_CPP_EXCEPTIONS
+  // When C++ exceptions are disabled, errors are immediately thrown as JS
+  // exceptions, so there is no need to catch and rethrow them here.
+  return callback();
+#endif // NAPI_CPP_EXCEPTIONS
+}
+
+// For use in JS to C++ void callback wrappers to catch any Napi::Error
+// exceptions and rethrow them as JavaScript exceptions before returning from the
+// callback.
+template <typename Callable>
+inline void WrapVoidCallback(Callable callback) {
+#ifdef NAPI_CPP_EXCEPTIONS
+  try {
+    callback();
+  } catch (const Error& e) {
+    e.ThrowAsJavaScriptException();
+  }
+#else // NAPI_CPP_EXCEPTIONS
+  // When C++ exceptions are disabled, errors are immediately thrown as JS
+  // exceptions, so there is no need to catch and rethrow them here.
+  callback();
+#endif // NAPI_CPP_EXCEPTIONS
+}
+
+template <typename Callable, typename Return>
+struct CallbackData {
+  static inline
+  napi_value Wrapper(napi_env env, napi_callback_info info) {
+    return details::WrapCallback([&] {
+      CallbackInfo callbackInfo(env, info);
+      CallbackData* callbackData =
+        static_cast<CallbackData*>(callbackInfo.Data());
+      callbackInfo.SetData(callbackData->data);
+      return callbackData->callback(callbackInfo);
+    });
+  }
+
+  Callable callback;
+  void* data;
+};
+
+template <typename Callable>
+struct CallbackData<Callable, void> {
+  static inline
+  napi_value Wrapper(napi_env env, napi_callback_info info) {
+    return details::WrapCallback([&] {
+      CallbackInfo callbackInfo(env, info);
+      CallbackData* callbackData =
+        static_cast<CallbackData*>(callbackInfo.Data());
+      callbackInfo.SetData(callbackData->data);
+      callbackData->callback(callbackInfo);
+      return nullptr;
+    });
+  }
+
+  Callable callback;
+  void* data;
+};
+
+template <void (*Callback)(const CallbackInfo& info)>
+static napi_value
+TemplatedVoidCallback(napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
+  return details::WrapCallback([&] {
+    CallbackInfo cbInfo(env, info);
+    Callback(cbInfo);
+    return nullptr;
+  });
+}
+
+template <Napi::Value (*Callback)(const CallbackInfo& info)>
+static napi_value
+TemplatedCallback(napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
+  return details::WrapCallback([&] {
+    CallbackInfo cbInfo(env, info);
+    return Callback(cbInfo);
+  });
+}
+
+template <typename T,
+          Napi::Value (T::*UnwrapCallback)(const CallbackInfo& info)>
+static napi_value
+TemplatedInstanceCallback(napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
+  return details::WrapCallback([&] {
+    CallbackInfo cbInfo(env, info);
+    T* instance = T::Unwrap(cbInfo.This().As<Object>());
+    return (instance->*UnwrapCallback)(cbInfo);
+  });
+}
+
+template <typename T, void (T::*UnwrapCallback)(const CallbackInfo& info)>
+static napi_value
+TemplatedInstanceVoidCallback(napi_env env,
+                              napi_callback_info info) NAPI_NOEXCEPT {
+  return details::WrapCallback([&] {
+    CallbackInfo cbInfo(env, info);
+    T* instance = T::Unwrap(cbInfo.This().As<Object>());
+    (instance->*UnwrapCallback)(cbInfo);
+    return nullptr;
+  });
+}
+
+template <typename T, typename Finalizer, typename Hint = void>
+struct FinalizeData {
+  static inline void Wrapper(napi_env env,
+                             void* data,
+                             void* finalizeHint) NAPI_NOEXCEPT {
+    WrapVoidCallback([&] {
+      FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
+      finalizeData->callback(Env(env), static_cast<T*>(data));
+      delete finalizeData;
+    });
+  }
+
+  static inline void WrapperWithHint(napi_env env,
+                                     void* data,
+                                     void* finalizeHint) NAPI_NOEXCEPT {
+    WrapVoidCallback([&] {
+      FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
+      finalizeData->callback(Env(env), static_cast<T*>(data), finalizeData->hint);
+      delete finalizeData;
+    });
+  }
+
+  Finalizer callback;
+  Hint* hint;
+};
+
+#if (NAPI_VERSION > 3 && !defined(__wasm32__))
+template <typename ContextType=void,
+          typename Finalizer=std::function<void(Env, void*, ContextType*)>,
+          typename FinalizerDataType=void>
+struct ThreadSafeFinalize {
+  static inline
+  void Wrapper(napi_env env, void* rawFinalizeData, void* /* rawContext */) {
+    if (rawFinalizeData == nullptr)
+      return;
+
+    ThreadSafeFinalize* finalizeData =
+        static_cast<ThreadSafeFinalize*>(rawFinalizeData);
+    finalizeData->callback(Env(env));
+    delete finalizeData;
+  }
+
+  static inline
+  void FinalizeWrapperWithData(napi_env env,
+                               void* rawFinalizeData,
+                               void* /* rawContext */) {
+    if (rawFinalizeData == nullptr)
+      return;
+
+    ThreadSafeFinalize* finalizeData =
+        static_cast<ThreadSafeFinalize*>(rawFinalizeData);
+    finalizeData->callback(Env(env), finalizeData->data);
+    delete finalizeData;
+  }
+
+  static inline
+  void FinalizeWrapperWithContext(napi_env env,
+                                  void* rawFinalizeData,
+                                  void* rawContext) {
+    if (rawFinalizeData == nullptr)
+      return;
+
+    ThreadSafeFinalize* finalizeData =
+        static_cast<ThreadSafeFinalize*>(rawFinalizeData);
+    finalizeData->callback(Env(env), static_cast<ContextType*>(rawContext));
+    delete finalizeData;
+  }
+
+  static inline
+  void FinalizeFinalizeWrapperWithDataAndContext(napi_env env,
+                                         void* rawFinalizeData,
+                                         void* rawContext) {
+    if (rawFinalizeData == nullptr)
+      return;
+
+    ThreadSafeFinalize* finalizeData =
+        static_cast<ThreadSafeFinalize*>(rawFinalizeData);
+    finalizeData->callback(Env(env), finalizeData->data,
+        static_cast<ContextType*>(rawContext));
+    delete finalizeData;
+  }
+
+  FinalizerDataType* data;
+  Finalizer callback;
+};
+
+template <typename ContextType, typename DataType, typename CallJs, CallJs call>
+typename std::enable_if<call != nullptr>::type static inline CallJsWrapper(
+    napi_env env, napi_value jsCallback, void* context, void* data) {
+  call(env,
+       Function(env, jsCallback),
+       static_cast<ContextType*>(context),
+       static_cast<DataType*>(data));
+}
+
+template <typename ContextType, typename DataType, typename CallJs, CallJs call>
+typename std::enable_if<call == nullptr>::type static inline CallJsWrapper(
+    napi_env env, napi_value jsCallback, void* /*context*/, void* /*data*/) {
+  if (jsCallback != nullptr) {
+    Function(env, jsCallback).Call(0, nullptr);
+  }
+}
+
+#if NAPI_VERSION > 4
+
+template <typename CallbackType, typename TSFN>
+napi_value DefaultCallbackWrapper(napi_env /*env*/, std::nullptr_t /*cb*/) {
+  return nullptr;
+}
+
+template <typename CallbackType, typename TSFN>
+napi_value DefaultCallbackWrapper(napi_env /*env*/, Napi::Function cb) {
+  return cb;
+}
+
+#else
+template <typename CallbackType, typename TSFN>
+napi_value DefaultCallbackWrapper(napi_env env, Napi::Function cb) {
+  if (cb.IsEmpty()) {
+    return TSFN::EmptyFunctionFactory(env);
+  }
+  return cb;
+}
+#endif  // NAPI_VERSION > 4
+#endif  // NAPI_VERSION > 3 && !defined(__wasm32__)
+
+template <typename Getter, typename Setter>
+struct AccessorCallbackData {
+  static inline
+  napi_value GetterWrapper(napi_env env, napi_callback_info info) {
+    return details::WrapCallback([&] {
+      CallbackInfo callbackInfo(env, info);
+      AccessorCallbackData* callbackData =
+        static_cast<AccessorCallbackData*>(callbackInfo.Data());
+      callbackInfo.SetData(callbackData->data);
+      return callbackData->getterCallback(callbackInfo);
+    });
+  }
+
+  static inline
+  napi_value SetterWrapper(napi_env env, napi_callback_info info) {
+    return details::WrapCallback([&] {
+      CallbackInfo callbackInfo(env, info);
+      AccessorCallbackData* callbackData =
+        static_cast<AccessorCallbackData*>(callbackInfo.Data());
+      callbackInfo.SetData(callbackData->data);
+      callbackData->setterCallback(callbackInfo);
+      return nullptr;
+    });
+  }
+
+  Getter getterCallback;
+  Setter setterCallback;
+  void* data;
+};
+
+}  // namespace details
+
+#ifndef NODE_ADDON_API_DISABLE_DEPRECATED
+# include "napi-inl.deprecated.h"
+#endif // !NODE_ADDON_API_DISABLE_DEPRECATED
+
+////////////////////////////////////////////////////////////////////////////////
+// Module registration
+////////////////////////////////////////////////////////////////////////////////
+
+// Register an add-on based on an initializer function.
+#define NODE_API_MODULE(modname, regfunc)                                      \
+  static napi_value __napi_##regfunc(napi_env env, napi_value exports) {       \
+    return Napi::RegisterModule(env, exports, regfunc);                        \
+  }                                                                            \
+  NAPI_MODULE(modname, __napi_##regfunc)
+
+// Register an add-on based on a subclass of `Addon<T>` with a custom Node.js
+// module name.
+#define NODE_API_NAMED_ADDON(modname, classname)                 \
+  static napi_value __napi_ ## classname(napi_env env,           \
+                                         napi_value exports) {   \
+    return Napi::RegisterModule(env, exports, &classname::Init); \
+  }                                                              \
+  NAPI_MODULE(modname, __napi_ ## classname)
+
+// Register an add-on based on a subclass of `Addon<T>` with the Node.js module
+// name given by node-gyp from the `target_name` in binding.gyp.
+#define NODE_API_ADDON(classname) \
+  NODE_API_NAMED_ADDON(NODE_GYP_MODULE_NAME, classname)
+
+// Adapt the NAPI_MODULE registration function:
+//  - Wrap the arguments in NAPI wrappers.
+//  - Catch any NAPI errors and rethrow as JS exceptions.
+inline napi_value RegisterModule(napi_env env,
+                                 napi_value exports,
+                                 ModuleRegisterCallback registerCallback) {
+  return details::WrapCallback([&] {
+    return napi_value(registerCallback(Napi::Env(env),
+                                       Napi::Object(env, exports)));
+  });
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Env class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Env::Env(napi_env env) : _env(env) {
+}
+
+inline Env::operator napi_env() const {
+  return _env;
+}
+
+inline Object Env::Global() const {
+  napi_value value;
+  napi_status status = napi_get_global(*this, &value);
+  NAPI_THROW_IF_FAILED(*this, status, Object());
+  return Object(*this, value);
+}
+
+inline Value Env::Undefined() const {
+  napi_value value;
+  napi_status status = napi_get_undefined(*this, &value);
+  NAPI_THROW_IF_FAILED(*this, status, Value());
+  return Value(*this, value);
+}
+
+inline Value Env::Null() const {
+  napi_value value;
+  napi_status status = napi_get_null(*this, &value);
+  NAPI_THROW_IF_FAILED(*this, status, Value());
+  return Value(*this, value);
+}
+
+inline bool Env::IsExceptionPending() const {
+  bool result;
+  napi_status status = napi_is_exception_pending(_env, &result);
+  if (status != napi_ok) result = false; // Checking for a pending exception shouldn't throw.
+  return result;
+}
+
+inline Error Env::GetAndClearPendingException() {
+  napi_value value;
+  napi_status status = napi_get_and_clear_last_exception(_env, &value);
+  if (status != napi_ok) {
+    // Don't throw another exception when failing to get the exception!
+    return Error();
+  }
+  return Error(_env, value);
+}
+
+inline Value Env::RunScript(const char* utf8script) {
+  String script = String::New(_env, utf8script);
+  return RunScript(script);
+}
+
+inline Value Env::RunScript(const std::string& utf8script) {
+  return RunScript(utf8script.c_str());
+}
+
+inline Value Env::RunScript(String script) {
+  napi_value result;
+  napi_status status = napi_run_script(_env, script, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Undefined());
+  return Value(_env, result);
+}
+
+#if NAPI_VERSION > 5
+template <typename T, Env::Finalizer<T> fini>
+inline void Env::SetInstanceData(T* data) {
+  napi_status status =
+    napi_set_instance_data(_env, data, [](napi_env env, void* data, void*) {
+      fini(env, static_cast<T*>(data));
+    }, nullptr);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+template <typename DataType,
+          typename HintType,
+          Napi::Env::FinalizerWithHint<DataType, HintType> fini>
+inline void Env::SetInstanceData(DataType* data, HintType* hint) {
+  napi_status status =
+    napi_set_instance_data(_env, data,
+      [](napi_env env, void* data, void* hint) {
+        fini(env, static_cast<DataType*>(data), static_cast<HintType*>(hint));
+      }, hint);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+template <typename T>
+inline T* Env::GetInstanceData() {
+  void* data = nullptr;
+
+  napi_status status = napi_get_instance_data(_env, &data);
+  NAPI_THROW_IF_FAILED(_env, status, nullptr);
+
+  return static_cast<T*>(data);
+}
+
+template <typename T> void Env::DefaultFini(Env, T* data) {
+  delete data;
+}
+
+template <typename DataType, typename HintType>
+void Env::DefaultFiniWithHint(Env, DataType* data, HintType*) {
+  delete data;
+}
+#endif  // NAPI_VERSION > 5
+
+////////////////////////////////////////////////////////////////////////////////
+// Value class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Value::Value() : _env(nullptr), _value(nullptr) {
+}
+
+inline Value::Value(napi_env env, napi_value value) : _env(env), _value(value) {
+}
+
+inline Value::operator napi_value() const {
+  return _value;
+}
+
+inline bool Value::operator ==(const Value& other) const {
+  return StrictEquals(other);
+}
+
+inline bool Value::operator !=(const Value& other) const {
+  return !this->operator ==(other);
+}
+
+inline bool Value::StrictEquals(const Value& other) const {
+  bool result;
+  napi_status status = napi_strict_equals(_env, *this, other, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline Napi::Env Value::Env() const {
+  return Napi::Env(_env);
+}
+
+inline bool Value::IsEmpty() const {
+  return _value == nullptr;
+}
+
+inline napi_valuetype Value::Type() const {
+  if (IsEmpty()) {
+    return napi_undefined;
+  }
+
+  napi_valuetype type;
+  napi_status status = napi_typeof(_env, _value, &type);
+  NAPI_THROW_IF_FAILED(_env, status, napi_undefined);
+  return type;
+}
+
+inline bool Value::IsUndefined() const {
+  return Type() == napi_undefined;
+}
+
+inline bool Value::IsNull() const {
+  return Type() == napi_null;
+}
+
+inline bool Value::IsBoolean() const {
+  return Type() == napi_boolean;
+}
+
+inline bool Value::IsNumber() const {
+  return Type() == napi_number;
+}
+
+#if NAPI_VERSION > 5
+inline bool Value::IsBigInt() const {
+  return Type() == napi_bigint;
+}
+#endif  // NAPI_VERSION > 5
+
+#if (NAPI_VERSION > 4)
+inline bool Value::IsDate() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_date(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+#endif
+
+inline bool Value::IsString() const {
+  return Type() == napi_string;
+}
+
+inline bool Value::IsSymbol() const {
+  return Type() == napi_symbol;
+}
+
+inline bool Value::IsArray() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_array(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Value::IsArrayBuffer() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_arraybuffer(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Value::IsTypedArray() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_typedarray(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Value::IsObject() const {
+  return Type() == napi_object || IsFunction();
+}
+
+inline bool Value::IsFunction() const {
+  return Type() == napi_function;
+}
+
+inline bool Value::IsPromise() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_promise(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Value::IsDataView() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_dataview(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Value::IsBuffer() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_buffer(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Value::IsExternal() const {
+  return Type() == napi_external;
+}
+
+template <typename T>
+inline T Value::As() const {
+  return T(_env, _value);
+}
+
+inline Boolean Value::ToBoolean() const {
+  napi_value result;
+  napi_status status = napi_coerce_to_bool(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Boolean());
+  return Boolean(_env, result);
+}
+
+inline Number Value::ToNumber() const {
+  napi_value result;
+  napi_status status = napi_coerce_to_number(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Number());
+  return Number(_env, result);
+}
+
+inline String Value::ToString() const {
+  napi_value result;
+  napi_status status = napi_coerce_to_string(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, String());
+  return String(_env, result);
+}
+
+inline Object Value::ToObject() const {
+  napi_value result;
+  napi_status status = napi_coerce_to_object(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Object());
+  return Object(_env, result);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Boolean class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Boolean Boolean::New(napi_env env, bool val) {
+  napi_value value;
+  napi_status status = napi_get_boolean(env, val, &value);
+  NAPI_THROW_IF_FAILED(env, status, Boolean());
+  return Boolean(env, value);
+}
+
+inline Boolean::Boolean() : Napi::Value() {
+}
+
+inline Boolean::Boolean(napi_env env, napi_value value) : Napi::Value(env, value) {
+}
+
+inline Boolean::operator bool() const {
+  return Value();
+}
+
+inline bool Boolean::Value() const {
+  bool result;
+  napi_status status = napi_get_value_bool(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Number class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Number Number::New(napi_env env, double val) {
+  napi_value value;
+  napi_status status = napi_create_double(env, val, &value);
+  NAPI_THROW_IF_FAILED(env, status, Number());
+  return Number(env, value);
+}
+
+inline Number::Number() : Value() {
+}
+
+inline Number::Number(napi_env env, napi_value value) : Value(env, value) {
+}
+
+inline Number::operator int32_t() const {
+  return Int32Value();
+}
+
+inline Number::operator uint32_t() const {
+  return Uint32Value();
+}
+
+inline Number::operator int64_t() const {
+  return Int64Value();
+}
+
+inline Number::operator float() const {
+  return FloatValue();
+}
+
+inline Number::operator double() const {
+  return DoubleValue();
+}
+
+inline int32_t Number::Int32Value() const {
+  int32_t result;
+  napi_status status = napi_get_value_int32(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+inline uint32_t Number::Uint32Value() const {
+  uint32_t result;
+  napi_status status = napi_get_value_uint32(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+inline int64_t Number::Int64Value() const {
+  int64_t result;
+  napi_status status = napi_get_value_int64(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+inline float Number::FloatValue() const {
+  return static_cast<float>(DoubleValue());
+}
+
+inline double Number::DoubleValue() const {
+  double result;
+  napi_status status = napi_get_value_double(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+#if NAPI_VERSION > 5
+////////////////////////////////////////////////////////////////////////////////
+// BigInt Class
+////////////////////////////////////////////////////////////////////////////////
+
+inline BigInt BigInt::New(napi_env env, int64_t val) {
+  napi_value value;
+  napi_status status = napi_create_bigint_int64(env, val, &value);
+  NAPI_THROW_IF_FAILED(env, status, BigInt());
+  return BigInt(env, value);
+}
+
+inline BigInt BigInt::New(napi_env env, uint64_t val) {
+  napi_value value;
+  napi_status status = napi_create_bigint_uint64(env, val, &value);
+  NAPI_THROW_IF_FAILED(env, status, BigInt());
+  return BigInt(env, value);
+}
+
+inline BigInt BigInt::New(napi_env env, int sign_bit, size_t word_count, const uint64_t* words) {
+  napi_value value;
+  napi_status status = napi_create_bigint_words(env, sign_bit, word_count, words, &value);
+  NAPI_THROW_IF_FAILED(env, status, BigInt());
+  return BigInt(env, value);
+}
+
+inline BigInt::BigInt() : Value() {
+}
+
+inline BigInt::BigInt(napi_env env, napi_value value) : Value(env, value) {
+}
+
+inline int64_t BigInt::Int64Value(bool* lossless) const {
+  int64_t result;
+  napi_status status = napi_get_value_bigint_int64(
+      _env, _value, &result, lossless);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+inline uint64_t BigInt::Uint64Value(bool* lossless) const {
+  uint64_t result;
+  napi_status status = napi_get_value_bigint_uint64(
+      _env, _value, &result, lossless);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+inline size_t BigInt::WordCount() const {
+  size_t word_count;
+  napi_status status = napi_get_value_bigint_words(
+      _env, _value, nullptr, &word_count, nullptr);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return word_count;
+}
+
+inline void BigInt::ToWords(int* sign_bit, size_t* word_count, uint64_t* words) {
+  napi_status status = napi_get_value_bigint_words(
+      _env, _value, sign_bit, word_count, words);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+#endif  // NAPI_VERSION > 5
+
+#if (NAPI_VERSION > 4)
+////////////////////////////////////////////////////////////////////////////////
+// Date Class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Date Date::New(napi_env env, double val) {
+  napi_value value;
+  napi_status status = napi_create_date(env, val, &value);
+  NAPI_THROW_IF_FAILED(env, status, Date());
+  return Date(env, value);
+}
+
+inline Date::Date() : Value() {
+}
+
+inline Date::Date(napi_env env, napi_value value) : Value(env, value) {
+}
+
+inline Date::operator double() const {
+  return ValueOf();
+}
+
+inline double Date::ValueOf() const {
+  double result;
+  napi_status status = napi_get_date_value(
+      _env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Name class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Name::Name() : Value() {
+}
+
+inline Name::Name(napi_env env, napi_value value) : Value(env, value) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// String class
+////////////////////////////////////////////////////////////////////////////////
+
+inline String String::New(napi_env env, const std::string& val) {
+  return String::New(env, val.c_str(), val.size());
+}
+
+inline String String::New(napi_env env, const std::u16string& val) {
+  return String::New(env, val.c_str(), val.size());
+}
+
+inline String String::New(napi_env env, const char* val) {
+  napi_value value;
+  napi_status status = napi_create_string_utf8(env, val, std::strlen(val), &value);
+  NAPI_THROW_IF_FAILED(env, status, String());
+  return String(env, value);
+}
+
+inline String String::New(napi_env env, const char16_t* val) {
+  napi_value value;
+  napi_status status = napi_create_string_utf16(env, val, std::u16string(val).size(), &value);
+  NAPI_THROW_IF_FAILED(env, status, String());
+  return String(env, value);
+}
+
+inline String String::New(napi_env env, const char* val, size_t length) {
+  napi_value value;
+  napi_status status = napi_create_string_utf8(env, val, length, &value);
+  NAPI_THROW_IF_FAILED(env, status, String());
+  return String(env, value);
+}
+
+inline String String::New(napi_env env, const char16_t* val, size_t length) {
+  napi_value value;
+  napi_status status = napi_create_string_utf16(env, val, length, &value);
+  NAPI_THROW_IF_FAILED(env, status, String());
+  return String(env, value);
+}
+
+inline String::String() : Name() {
+}
+
+inline String::String(napi_env env, napi_value value) : Name(env, value) {
+}
+
+inline String::operator std::string() const {
+  return Utf8Value();
+}
+
+inline String::operator std::u16string() const {
+  return Utf16Value();
+}
+
+inline std::string String::Utf8Value() const {
+  size_t length;
+  napi_status status = napi_get_value_string_utf8(_env, _value, nullptr, 0, &length);
+  NAPI_THROW_IF_FAILED(_env, status, "");
+
+  std::string value;
+  value.reserve(length + 1);
+  value.resize(length);
+  status = napi_get_value_string_utf8(_env, _value, &value[0], value.capacity(), nullptr);
+  NAPI_THROW_IF_FAILED(_env, status, "");
+  return value;
+}
+
+inline std::u16string String::Utf16Value() const {
+  size_t length;
+  napi_status status = napi_get_value_string_utf16(_env, _value, nullptr, 0, &length);
+  NAPI_THROW_IF_FAILED(_env, status, NAPI_WIDE_TEXT(""));
+
+  std::u16string value;
+  value.reserve(length + 1);
+  value.resize(length);
+  status = napi_get_value_string_utf16(_env, _value, &value[0], value.capacity(), nullptr);
+  NAPI_THROW_IF_FAILED(_env, status, NAPI_WIDE_TEXT(""));
+  return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Symbol class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Symbol Symbol::New(napi_env env, const char* description) {
+  napi_value descriptionValue = description != nullptr ?
+    String::New(env, description) : static_cast<napi_value>(nullptr);
+  return Symbol::New(env, descriptionValue);
+}
+
+inline Symbol Symbol::New(napi_env env, const std::string& description) {
+  napi_value descriptionValue = String::New(env, description);
+  return Symbol::New(env, descriptionValue);
+}
+
+inline Symbol Symbol::New(napi_env env, String description) {
+  napi_value descriptionValue = description;
+  return Symbol::New(env, descriptionValue);
+}
+
+inline Symbol Symbol::New(napi_env env, napi_value description) {
+  napi_value value;
+  napi_status status = napi_create_symbol(env, description, &value);
+  NAPI_THROW_IF_FAILED(env, status, Symbol());
+  return Symbol(env, value);
+}
+
+inline Symbol Symbol::WellKnown(napi_env env, const std::string& name) {
+  return Napi::Env(env).Global().Get("Symbol").As<Object>().Get(name).As<Symbol>();
+}
+
+inline Symbol::Symbol() : Name() {
+}
+
+inline Symbol::Symbol(napi_env env, napi_value value) : Name(env, value) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Automagic value creation
+////////////////////////////////////////////////////////////////////////////////
+
+namespace details {
+template <typename T>
+struct vf_number {
+  static Number From(napi_env env, T value) {
+    return Number::New(env, static_cast<double>(value));
+  }
+};
+
+template<>
+struct vf_number<bool> {
+  static Boolean From(napi_env env, bool value) {
+    return Boolean::New(env, value);
+  }
+};
+
+struct vf_utf8_charp {
+  static String From(napi_env env, const char* value) {
+    return String::New(env, value);
+  }
+};
+
+struct vf_utf16_charp {
+  static String From(napi_env env, const char16_t* value) {
+    return String::New(env, value);
+  }
+};
+struct vf_utf8_string {
+  static String From(napi_env env, const std::string& value) {
+    return String::New(env, value);
+  }
+};
+
+struct vf_utf16_string {
+  static String From(napi_env env, const std::u16string& value) {
+    return String::New(env, value);
+  }
+};
+
+template <typename T>
+struct vf_fallback {
+  static Value From(napi_env env, const T& value) {
+    return Value(env, value);
+  }
+};
+
+template <typename...> struct disjunction : std::false_type {};
+template <typename B> struct disjunction<B> : B {};
+template <typename B, typename... Bs>
+struct disjunction<B, Bs...>
+    : std::conditional<bool(B::value), B, disjunction<Bs...>>::type {};
+
+template <typename T>
+struct can_make_string
+    : disjunction<typename std::is_convertible<T, const char *>::type,
+                  typename std::is_convertible<T, const char16_t *>::type,
+                  typename std::is_convertible<T, std::string>::type,
+                  typename std::is_convertible<T, std::u16string>::type> {};
+}
+
+template <typename T>
+Value Value::From(napi_env env, const T& value) {
+  using Helper = typename std::conditional<
+    std::is_integral<T>::value || std::is_floating_point<T>::value,
+    details::vf_number<T>,
+    typename std::conditional<
+      details::can_make_string<T>::value,
+      String,
+      details::vf_fallback<T>
+    >::type
+  >::type;
+  return Helper::From(env, value);
+}
+
+template <typename T>
+String String::From(napi_env env, const T& value) {
+  struct Dummy {};
+  using Helper = typename std::conditional<
+    std::is_convertible<T, const char*>::value,
+    details::vf_utf8_charp,
+    typename std::conditional<
+      std::is_convertible<T, const char16_t*>::value,
+      details::vf_utf16_charp,
+      typename std::conditional<
+        std::is_convertible<T, std::string>::value,
+        details::vf_utf8_string,
+        typename std::conditional<
+          std::is_convertible<T, std::u16string>::value,
+          details::vf_utf16_string,
+          Dummy
+        >::type
+      >::type
+    >::type
+  >::type;
+  return Helper::From(env, value);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Object class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename Key>
+inline Object::PropertyLValue<Key>::operator Value() const {
+  return Object(_env, _object).Get(_key);
+}
+
+template <typename Key> template <typename ValueType>
+inline Object::PropertyLValue<Key>& Object::PropertyLValue<Key>::operator =(ValueType value) {
+  Object(_env, _object).Set(_key, value);
+  return *this;
+}
+
+template <typename Key>
+inline Object::PropertyLValue<Key>::PropertyLValue(Object object, Key key)
+  : _env(object.Env()), _object(object), _key(key) {}
+
+inline Object Object::New(napi_env env) {
+  napi_value value;
+  napi_status status = napi_create_object(env, &value);
+  NAPI_THROW_IF_FAILED(env, status, Object());
+  return Object(env, value);
+}
+
+inline Object::Object() : Value() {
+}
+
+inline Object::Object(napi_env env, napi_value value) : Value(env, value) {
+}
+
+inline Object::PropertyLValue<std::string> Object::operator [](const char* utf8name) {
+  return PropertyLValue<std::string>(*this, utf8name);
+}
+
+inline Object::PropertyLValue<std::string> Object::operator [](const std::string& utf8name) {
+  return PropertyLValue<std::string>(*this, utf8name);
+}
+
+inline Object::PropertyLValue<uint32_t> Object::operator [](uint32_t index) {
+  return PropertyLValue<uint32_t>(*this, index);
+}
+
+inline Value Object::operator [](const char* utf8name) const {
+  return Get(utf8name);
+}
+
+inline Value Object::operator [](const std::string& utf8name) const {
+  return Get(utf8name);
+}
+
+inline Value Object::operator [](uint32_t index) const {
+  return Get(index);
+}
+
+inline bool Object::Has(napi_value key) const {
+  bool result;
+  napi_status status = napi_has_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::Has(Value key) const {
+  bool result;
+  napi_status status = napi_has_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::Has(const char* utf8name) const {
+  bool result;
+  napi_status status = napi_has_named_property(_env, _value, utf8name, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::Has(const std::string& utf8name) const {
+  return Has(utf8name.c_str());
+}
+
+inline bool Object::HasOwnProperty(napi_value key) const {
+  bool result;
+  napi_status status = napi_has_own_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::HasOwnProperty(Value key) const {
+  bool result;
+  napi_status status = napi_has_own_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::HasOwnProperty(const char* utf8name) const {
+  napi_value key;
+  napi_status status = napi_create_string_utf8(_env, utf8name, std::strlen(utf8name), &key);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return HasOwnProperty(key);
+}
+
+inline bool Object::HasOwnProperty(const std::string& utf8name) const {
+  return HasOwnProperty(utf8name.c_str());
+}
+
+inline Value Object::Get(napi_value key) const {
+  napi_value result;
+  napi_status status = napi_get_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, result);
+}
+
+inline Value Object::Get(Value key) const {
+  napi_value result;
+  napi_status status = napi_get_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, result);
+}
+
+inline Value Object::Get(const char* utf8name) const {
+  napi_value result;
+  napi_status status = napi_get_named_property(_env, _value, utf8name, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, result);
+}
+
+inline Value Object::Get(const std::string& utf8name) const {
+  return Get(utf8name.c_str());
+}
+
+template <typename ValueType>
+inline bool Object::Set(napi_value key, const ValueType& value) {
+  napi_status status =
+      napi_set_property(_env, _value, key, Value::From(_env, value));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+template <typename ValueType>
+inline bool Object::Set(Value key, const ValueType& value) {
+  napi_status status =
+      napi_set_property(_env, _value, key, Value::From(_env, value));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+template <typename ValueType>
+inline bool Object::Set(const char* utf8name, const ValueType& value) {
+  napi_status status =
+      napi_set_named_property(_env, _value, utf8name, Value::From(_env, value));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+template <typename ValueType>
+inline bool Object::Set(const std::string& utf8name, const ValueType& value) {
+  return Set(utf8name.c_str(), value);
+}
+
+inline bool Object::Delete(napi_value key) {
+  bool result;
+  napi_status status = napi_delete_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::Delete(Value key) {
+  bool result;
+  napi_status status = napi_delete_property(_env, _value, key, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline bool Object::Delete(const char* utf8name) {
+  return Delete(String::New(_env, utf8name));
+}
+
+inline bool Object::Delete(const std::string& utf8name) {
+  return Delete(String::New(_env, utf8name));
+}
+
+inline bool Object::Has(uint32_t index) const {
+  bool result;
+  napi_status status = napi_has_element(_env, _value, index, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline Value Object::Get(uint32_t index) const {
+  napi_value value;
+  napi_status status = napi_get_element(_env, _value, index, &value);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, value);
+}
+
+template <typename ValueType>
+inline bool Object::Set(uint32_t index, const ValueType& value) {
+  napi_status status =
+      napi_set_element(_env, _value, index, Value::From(_env, value));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+inline bool Object::Delete(uint32_t index) {
+  bool result;
+  napi_status status = napi_delete_element(_env, _value, index, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+inline Array Object::GetPropertyNames() const {
+  napi_value result;
+  napi_status status = napi_get_property_names(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Array());
+  return Array(_env, result);
+}
+
+inline bool Object::DefineProperty(const PropertyDescriptor& property) {
+  napi_status status = napi_define_properties(_env, _value, 1,
+    reinterpret_cast<const napi_property_descriptor*>(&property));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+inline bool Object::DefineProperties(
+    const std::initializer_list<PropertyDescriptor>& properties) {
+  napi_status status = napi_define_properties(_env, _value, properties.size(),
+    reinterpret_cast<const napi_property_descriptor*>(properties.begin()));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+inline bool Object::DefineProperties(
+    const std::vector<PropertyDescriptor>& properties) {
+  napi_status status = napi_define_properties(_env, _value, properties.size(),
+    reinterpret_cast<const napi_property_descriptor*>(properties.data()));
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+inline bool Object::InstanceOf(const Function& constructor) const {
+  bool result;
+  napi_status status = napi_instanceof(_env, _value, constructor, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+
+template <typename Finalizer, typename T>
+inline void Object::AddFinalizer(Finalizer finalizeCallback, T* data) {
+  details::FinalizeData<T, Finalizer>* finalizeData =
+      new details::FinalizeData<T, Finalizer>(
+          {std::move(finalizeCallback), nullptr});
+  napi_status status =
+      details::AttachData(_env,
+                          *this,
+                          data,
+                          details::FinalizeData<T, Finalizer>::Wrapper,
+                          finalizeData);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED_VOID(_env, status);
+  }
+}
+
+template <typename Finalizer, typename T, typename Hint>
+inline void Object::AddFinalizer(Finalizer finalizeCallback,
+                                 T* data,
+                                 Hint* finalizeHint) {
+  details::FinalizeData<T, Finalizer, Hint>* finalizeData =
+      new details::FinalizeData<T, Finalizer, Hint>(
+          {std::move(finalizeCallback), finalizeHint});
+  napi_status status =
+      details::AttachData(_env,
+                          *this,
+                          data,
+                          details::FinalizeData<T, Finalizer, Hint>::WrapperWithHint,
+                          finalizeData);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED_VOID(_env, status);
+  }
+}
+
+#if NAPI_VERSION >= 8
+inline bool Object::Freeze() {
+  napi_status status = napi_object_freeze(_env, _value);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+
+inline bool Object::Seal() {
+  napi_status status = napi_object_seal(_env, _value);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return true;
+}
+#endif  // NAPI_VERSION >= 8
+
+////////////////////////////////////////////////////////////////////////////////
+// External class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline External<T> External<T>::New(napi_env env, T* data) {
+  napi_value value;
+  napi_status status = napi_create_external(env, data, nullptr, nullptr, &value);
+  NAPI_THROW_IF_FAILED(env, status, External());
+  return External(env, value);
+}
+
+template <typename T>
+template <typename Finalizer>
+inline External<T> External<T>::New(napi_env env,
+                                    T* data,
+                                    Finalizer finalizeCallback) {
+  napi_value value;
+  details::FinalizeData<T, Finalizer>* finalizeData =
+      new details::FinalizeData<T, Finalizer>(
+          {std::move(finalizeCallback), nullptr});
+  napi_status status = napi_create_external(
+    env,
+    data,
+    details::FinalizeData<T, Finalizer>::Wrapper,
+    finalizeData,
+    &value);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, External());
+  }
+  return External(env, value);
+}
+
+template <typename T>
+template <typename Finalizer, typename Hint>
+inline External<T> External<T>::New(napi_env env,
+                                    T* data,
+                                    Finalizer finalizeCallback,
+                                    Hint* finalizeHint) {
+  napi_value value;
+  details::FinalizeData<T, Finalizer, Hint>* finalizeData =
+      new details::FinalizeData<T, Finalizer, Hint>(
+          {std::move(finalizeCallback), finalizeHint});
+  napi_status status = napi_create_external(
+    env,
+    data,
+    details::FinalizeData<T, Finalizer, Hint>::WrapperWithHint,
+    finalizeData,
+    &value);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, External());
+  }
+  return External(env, value);
+}
+
+template <typename T>
+inline External<T>::External() : Value() {
+}
+
+template <typename T>
+inline External<T>::External(napi_env env, napi_value value) : Value(env, value) {
+}
+
+template <typename T>
+inline T* External<T>::Data() const {
+  void* data;
+  napi_status status = napi_get_value_external(_env, _value, &data);
+  NAPI_THROW_IF_FAILED(_env, status, nullptr);
+  return reinterpret_cast<T*>(data);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Array class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Array Array::New(napi_env env) {
+  napi_value value;
+  napi_status status = napi_create_array(env, &value);
+  NAPI_THROW_IF_FAILED(env, status, Array());
+  return Array(env, value);
+}
+
+inline Array Array::New(napi_env env, size_t length) {
+  napi_value value;
+  napi_status status = napi_create_array_with_length(env, length, &value);
+  NAPI_THROW_IF_FAILED(env, status, Array());
+  return Array(env, value);
+}
+
+inline Array::Array() : Object() {
+}
+
+inline Array::Array(napi_env env, napi_value value) : Object(env, value) {
+}
+
+inline uint32_t Array::Length() const {
+  uint32_t result;
+  napi_status status = napi_get_array_length(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ArrayBuffer class
+////////////////////////////////////////////////////////////////////////////////
+
+inline ArrayBuffer ArrayBuffer::New(napi_env env, size_t byteLength) {
+  napi_value value;
+  void* data;
+  napi_status status = napi_create_arraybuffer(env, byteLength, &data, &value);
+  NAPI_THROW_IF_FAILED(env, status, ArrayBuffer());
+
+  return ArrayBuffer(env, value);
+}
+
+inline ArrayBuffer ArrayBuffer::New(napi_env env,
+                                    void* externalData,
+                                    size_t byteLength) {
+  napi_value value;
+  napi_status status = napi_create_external_arraybuffer(
+    env, externalData, byteLength, nullptr, nullptr, &value);
+  NAPI_THROW_IF_FAILED(env, status, ArrayBuffer());
+
+  return ArrayBuffer(env, value);
+}
+
+template <typename Finalizer>
+inline ArrayBuffer ArrayBuffer::New(napi_env env,
+                                    void* externalData,
+                                    size_t byteLength,
+                                    Finalizer finalizeCallback) {
+  napi_value value;
+  details::FinalizeData<void, Finalizer>* finalizeData =
+      new details::FinalizeData<void, Finalizer>(
+          {std::move(finalizeCallback), nullptr});
+  napi_status status = napi_create_external_arraybuffer(
+    env,
+    externalData,
+    byteLength,
+    details::FinalizeData<void, Finalizer>::Wrapper,
+    finalizeData,
+    &value);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, ArrayBuffer());
+  }
+
+  return ArrayBuffer(env, value);
+}
+
+template <typename Finalizer, typename Hint>
+inline ArrayBuffer ArrayBuffer::New(napi_env env,
+                                    void* externalData,
+                                    size_t byteLength,
+                                    Finalizer finalizeCallback,
+                                    Hint* finalizeHint) {
+  napi_value value;
+  details::FinalizeData<void, Finalizer, Hint>* finalizeData =
+      new details::FinalizeData<void, Finalizer, Hint>(
+          {std::move(finalizeCallback), finalizeHint});
+  napi_status status = napi_create_external_arraybuffer(
+    env,
+    externalData,
+    byteLength,
+    details::FinalizeData<void, Finalizer, Hint>::WrapperWithHint,
+    finalizeData,
+    &value);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, ArrayBuffer());
+  }
+
+  return ArrayBuffer(env, value);
+}
+
+inline ArrayBuffer::ArrayBuffer() : Object() {
+}
+
+inline ArrayBuffer::ArrayBuffer(napi_env env, napi_value value)
+  : Object(env, value) {
+}
+
+inline void* ArrayBuffer::Data() {
+  void* data;
+  napi_status status = napi_get_arraybuffer_info(_env, _value, &data, nullptr);
+  NAPI_THROW_IF_FAILED(_env, status, nullptr);
+  return data;
+}
+
+inline size_t ArrayBuffer::ByteLength() {
+  size_t length;
+  napi_status status = napi_get_arraybuffer_info(_env, _value, nullptr, &length);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return length;
+}
+
+#if NAPI_VERSION >= 7
+inline bool ArrayBuffer::IsDetached() const {
+  bool detached;
+  napi_status status = napi_is_detached_arraybuffer(_env, _value, &detached);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return detached;
+}
+
+inline void ArrayBuffer::Detach() {
+  napi_status status = napi_detach_arraybuffer(_env, _value);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+#endif  // NAPI_VERSION >= 7
+
+////////////////////////////////////////////////////////////////////////////////
+// DataView class
+////////////////////////////////////////////////////////////////////////////////
+inline DataView DataView::New(napi_env env,
+                              Napi::ArrayBuffer arrayBuffer) {
+  return New(env, arrayBuffer, 0, arrayBuffer.ByteLength());
+}
+
+inline DataView DataView::New(napi_env env,
+                              Napi::ArrayBuffer arrayBuffer,
+                              size_t byteOffset) {
+  if (byteOffset > arrayBuffer.ByteLength()) {
+    NAPI_THROW(RangeError::New(env,
+        "Start offset is outside the bounds of the buffer"),
+        DataView());
+  }
+  return New(env, arrayBuffer, byteOffset,
+      arrayBuffer.ByteLength() - byteOffset);
+}
+
+inline DataView DataView::New(napi_env env,
+                              Napi::ArrayBuffer arrayBuffer,
+                              size_t byteOffset,
+                              size_t byteLength) {
+  if (byteOffset + byteLength > arrayBuffer.ByteLength()) {
+    NAPI_THROW(RangeError::New(env, "Invalid DataView length"),
+               DataView());
+  }
+  napi_value value;
+  napi_status status = napi_create_dataview(
+    env, byteLength, arrayBuffer, byteOffset, &value);
+  NAPI_THROW_IF_FAILED(env, status, DataView());
+  return DataView(env, value);
+}
+
+inline DataView::DataView() : Object() {
+}
+
+inline DataView::DataView(napi_env env, napi_value value) : Object(env, value) {
+  napi_status status = napi_get_dataview_info(
+    _env,
+    _value   /* dataView */,
+    &_length /* byteLength */,
+    &_data   /* data */,
+    nullptr  /* arrayBuffer */,
+    nullptr  /* byteOffset */);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline Napi::ArrayBuffer DataView::ArrayBuffer() const {
+  napi_value arrayBuffer;
+  napi_status status = napi_get_dataview_info(
+    _env,
+    _value       /* dataView */,
+    nullptr      /* byteLength */,
+    nullptr      /* data */,
+    &arrayBuffer /* arrayBuffer */,
+    nullptr      /* byteOffset */);
+  NAPI_THROW_IF_FAILED(_env, status, Napi::ArrayBuffer());
+  return Napi::ArrayBuffer(_env, arrayBuffer);
+}
+
+inline size_t DataView::ByteOffset() const {
+  size_t byteOffset;
+  napi_status status = napi_get_dataview_info(
+    _env,
+    _value      /* dataView */,
+    nullptr     /* byteLength */,
+    nullptr     /* data */,
+    nullptr     /* arrayBuffer */,
+    &byteOffset /* byteOffset */);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return byteOffset;
+}
+
+inline size_t DataView::ByteLength() const {
+  return _length;
+}
+
+inline void* DataView::Data() const {
+  return _data;
+}
+
+inline float DataView::GetFloat32(size_t byteOffset) const {
+  return ReadData<float>(byteOffset);
+}
+
+inline double DataView::GetFloat64(size_t byteOffset) const {
+  return ReadData<double>(byteOffset);
+}
+
+inline int8_t DataView::GetInt8(size_t byteOffset) const {
+  return ReadData<int8_t>(byteOffset);
+}
+
+inline int16_t DataView::GetInt16(size_t byteOffset) const {
+  return ReadData<int16_t>(byteOffset);
+}
+
+inline int32_t DataView::GetInt32(size_t byteOffset) const {
+  return ReadData<int32_t>(byteOffset);
+}
+
+inline uint8_t DataView::GetUint8(size_t byteOffset) const {
+  return ReadData<uint8_t>(byteOffset);
+}
+
+inline uint16_t DataView::GetUint16(size_t byteOffset) const {
+  return ReadData<uint16_t>(byteOffset);
+}
+
+inline uint32_t DataView::GetUint32(size_t byteOffset) const {
+  return ReadData<uint32_t>(byteOffset);
+}
+
+inline void DataView::SetFloat32(size_t byteOffset, float value) const {
+  WriteData<float>(byteOffset, value);
+}
+
+inline void DataView::SetFloat64(size_t byteOffset, double value) const {
+  WriteData<double>(byteOffset, value);
+}
+
+inline void DataView::SetInt8(size_t byteOffset, int8_t value) const {
+  WriteData<int8_t>(byteOffset, value);
+}
+
+inline void DataView::SetInt16(size_t byteOffset, int16_t value) const {
+  WriteData<int16_t>(byteOffset, value);
+}
+
+inline void DataView::SetInt32(size_t byteOffset, int32_t value) const {
+  WriteData<int32_t>(byteOffset, value);
+}
+
+inline void DataView::SetUint8(size_t byteOffset, uint8_t value) const {
+  WriteData<uint8_t>(byteOffset, value);
+}
+
+inline void DataView::SetUint16(size_t byteOffset, uint16_t value) const {
+  WriteData<uint16_t>(byteOffset, value);
+}
+
+inline void DataView::SetUint32(size_t byteOffset, uint32_t value) const {
+  WriteData<uint32_t>(byteOffset, value);
+}
+
+template <typename T>
+inline T DataView::ReadData(size_t byteOffset) const {
+  if (byteOffset + sizeof(T) > _length ||
+      byteOffset + sizeof(T) < byteOffset) {  // overflow
+    NAPI_THROW(RangeError::New(_env,
+        "Offset is outside the bounds of the DataView"), 0);
+  }
+
+  return *reinterpret_cast<T*>(static_cast<uint8_t*>(_data) + byteOffset);
+}
+
+template <typename T>
+inline void DataView::WriteData(size_t byteOffset, T value) const {
+  if (byteOffset + sizeof(T) > _length ||
+      byteOffset + sizeof(T) < byteOffset) {  // overflow
+    NAPI_THROW_VOID(RangeError::New(_env,
+        "Offset is outside the bounds of the DataView"));
+  }
+
+  *reinterpret_cast<T*>(static_cast<uint8_t*>(_data) + byteOffset) = value;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TypedArray class
+////////////////////////////////////////////////////////////////////////////////
+
+inline TypedArray::TypedArray()
+  : Object(), _type(TypedArray::unknown_array_type), _length(0) {
+}
+
+inline TypedArray::TypedArray(napi_env env, napi_value value)
+  : Object(env, value), _type(TypedArray::unknown_array_type), _length(0) {
+}
+
+inline TypedArray::TypedArray(napi_env env,
+                              napi_value value,
+                              napi_typedarray_type type,
+                              size_t length)
+  : Object(env, value), _type(type), _length(length) {
+}
+
+inline napi_typedarray_type TypedArray::TypedArrayType() const {
+  if (_type == TypedArray::unknown_array_type) {
+    napi_status status = napi_get_typedarray_info(_env, _value,
+      &const_cast<TypedArray*>(this)->_type, &const_cast<TypedArray*>(this)->_length,
+      nullptr, nullptr, nullptr);
+    NAPI_THROW_IF_FAILED(_env, status, napi_int8_array);
+  }
+
+  return _type;
+}
+
+inline uint8_t TypedArray::ElementSize() const {
+  switch (TypedArrayType()) {
+    case napi_int8_array:
+    case napi_uint8_array:
+    case napi_uint8_clamped_array:
+      return 1;
+    case napi_int16_array:
+    case napi_uint16_array:
+      return 2;
+    case napi_int32_array:
+    case napi_uint32_array:
+    case napi_float32_array:
+      return 4;
+    case napi_float64_array:
+#if (NAPI_VERSION > 5)
+    case napi_bigint64_array:
+    case napi_biguint64_array:
+#endif  // (NAPI_VERSION > 5)
+      return 8;
+    default:
+      return 0;
+  }
+}
+
+inline size_t TypedArray::ElementLength() const {
+  if (_type == TypedArray::unknown_array_type) {
+    napi_status status = napi_get_typedarray_info(_env, _value,
+      &const_cast<TypedArray*>(this)->_type, &const_cast<TypedArray*>(this)->_length,
+      nullptr, nullptr, nullptr);
+    NAPI_THROW_IF_FAILED(_env, status, 0);
+  }
+
+  return _length;
+}
+
+inline size_t TypedArray::ByteOffset() const {
+  size_t byteOffset;
+  napi_status status = napi_get_typedarray_info(
+    _env, _value, nullptr, nullptr, nullptr, nullptr, &byteOffset);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return byteOffset;
+}
+
+inline size_t TypedArray::ByteLength() const {
+  return ElementSize() * ElementLength();
+}
+
+inline Napi::ArrayBuffer TypedArray::ArrayBuffer() const {
+  napi_value arrayBuffer;
+  napi_status status = napi_get_typedarray_info(
+    _env, _value, nullptr, nullptr, nullptr, &arrayBuffer, nullptr);
+  NAPI_THROW_IF_FAILED(_env, status, Napi::ArrayBuffer());
+  return Napi::ArrayBuffer(_env, arrayBuffer);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TypedArrayOf<T> class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline TypedArrayOf<T> TypedArrayOf<T>::New(napi_env env,
+                                            size_t elementLength,
+                                            napi_typedarray_type type) {
+  Napi::ArrayBuffer arrayBuffer = Napi::ArrayBuffer::New(env, elementLength * sizeof (T));
+  return New(env, elementLength, arrayBuffer, 0, type);
+}
+
+template <typename T>
+inline TypedArrayOf<T> TypedArrayOf<T>::New(napi_env env,
+                                            size_t elementLength,
+                                            Napi::ArrayBuffer arrayBuffer,
+                                            size_t bufferOffset,
+                                            napi_typedarray_type type) {
+  napi_value value;
+  napi_status status = napi_create_typedarray(
+    env, type, elementLength, arrayBuffer, bufferOffset, &value);
+  NAPI_THROW_IF_FAILED(env, status, TypedArrayOf<T>());
+
+  return TypedArrayOf<T>(
+    env, value, type, elementLength,
+    reinterpret_cast<T*>(reinterpret_cast<uint8_t*>(arrayBuffer.Data()) + bufferOffset));
+}
+
+template <typename T>
+inline TypedArrayOf<T>::TypedArrayOf() : TypedArray(), _data(nullptr) {
+}
+
+template <typename T>
+inline TypedArrayOf<T>::TypedArrayOf(napi_env env, napi_value value)
+  : TypedArray(env, value), _data(nullptr) {
+  napi_status status = napi_ok;
+  if (value != nullptr) {
+    status = napi_get_typedarray_info(
+      _env, _value, &_type, &_length, reinterpret_cast<void**>(&_data), nullptr, nullptr);
+  } else {
+    _type = TypedArrayTypeForPrimitiveType<T>();
+    _length = 0;
+  }
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+template <typename T>
+inline TypedArrayOf<T>::TypedArrayOf(napi_env env,
+                                     napi_value value,
+                                     napi_typedarray_type type,
+                                     size_t length,
+                                     T* data)
+  : TypedArray(env, value, type, length), _data(data) {
+  if (!(type == TypedArrayTypeForPrimitiveType<T>() ||
+      (type == napi_uint8_clamped_array && std::is_same<T, uint8_t>::value))) {
+    NAPI_THROW_VOID(TypeError::New(env, "Array type must match the template parameter. "
+      "(Uint8 arrays may optionally have the \"clamped\" array type.)"));
+  }
+}
+
+template <typename T>
+inline T& TypedArrayOf<T>::operator [](size_t index) {
+  return _data[index];
+}
+
+template <typename T>
+inline const T& TypedArrayOf<T>::operator [](size_t index) const {
+  return _data[index];
+}
+
+template <typename T>
+inline T* TypedArrayOf<T>::Data() {
+  return _data;
+}
+
+template <typename T>
+inline const T* TypedArrayOf<T>::Data() const {
+  return _data;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Function class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename CbData>
+static inline napi_status
+CreateFunction(napi_env env,
+               const char* utf8name,
+               napi_callback cb,
+               CbData* data,
+               napi_value* result) {
+  napi_status status =
+      napi_create_function(env, utf8name, NAPI_AUTO_LENGTH, cb, data, result);
+  if (status == napi_ok) {
+    status = Napi::details::AttachData(env, *result, data);
+  }
+
+  return status;
+}
+
+template <Function::VoidCallback cb>
+inline Function Function::New(napi_env env, const char* utf8name, void* data) {
+  napi_value result = nullptr;
+  napi_status status = napi_create_function(env,
+                                            utf8name,
+                                            NAPI_AUTO_LENGTH,
+                                            details::TemplatedVoidCallback<cb>,
+                                            data,
+                                            &result);
+  NAPI_THROW_IF_FAILED(env, status, Function());
+  return Function(env, result);
+}
+
+template <Function::Callback cb>
+inline Function Function::New(napi_env env, const char* utf8name, void* data) {
+  napi_value result = nullptr;
+  napi_status status = napi_create_function(env,
+                                            utf8name,
+                                            NAPI_AUTO_LENGTH,
+                                            details::TemplatedCallback<cb>,
+                                            data,
+                                            &result);
+  NAPI_THROW_IF_FAILED(env, status, Function());
+  return Function(env, result);
+}
+
+template <Function::VoidCallback cb>
+inline Function Function::New(napi_env env,
+                              const std::string& utf8name,
+                              void* data) {
+  return Function::New<cb>(env, utf8name.c_str(), data);
+}
+
+template <Function::Callback cb>
+inline Function Function::New(napi_env env,
+                              const std::string& utf8name,
+                              void* data) {
+  return Function::New<cb>(env, utf8name.c_str(), data);
+}
+
+template <typename Callable>
+inline Function Function::New(napi_env env,
+                              Callable cb,
+                              const char* utf8name,
+                              void* data) {
+  using ReturnType = decltype(cb(CallbackInfo(nullptr, nullptr)));
+  using CbData = details::CallbackData<Callable, ReturnType>;
+  auto callbackData = new CbData({ cb, data });
+
+  napi_value value;
+  napi_status status = CreateFunction(env,
+                                      utf8name,
+                                      CbData::Wrapper,
+                                      callbackData,
+                                      &value);
+  if (status != napi_ok) {
+    delete callbackData;
+    NAPI_THROW_IF_FAILED(env, status, Function());
+  }
+
+  return Function(env, value);
+}
+
+template <typename Callable>
+inline Function Function::New(napi_env env,
+                              Callable cb,
+                              const std::string& utf8name,
+                              void* data) {
+  return New(env, cb, utf8name.c_str(), data);
+}
+
+inline Function::Function() : Object() {
+}
+
+inline Function::Function(napi_env env, napi_value value) : Object(env, value) {
+}
+
+inline Value Function::operator ()(const std::initializer_list<napi_value>& args) const {
+  return Call(Env().Undefined(), args);
+}
+
+inline Value Function::Call(const std::initializer_list<napi_value>& args) const {
+  return Call(Env().Undefined(), args);
+}
+
+inline Value Function::Call(const std::vector<napi_value>& args) const {
+  return Call(Env().Undefined(), args);
+}
+
+inline Value Function::Call(size_t argc, const napi_value* args) const {
+  return Call(Env().Undefined(), argc, args);
+}
+
+inline Value Function::Call(napi_value recv, const std::initializer_list<napi_value>& args) const {
+  return Call(recv, args.size(), args.begin());
+}
+
+inline Value Function::Call(napi_value recv, const std::vector<napi_value>& args) const {
+  return Call(recv, args.size(), args.data());
+}
+
+inline Value Function::Call(napi_value recv, size_t argc, const napi_value* args) const {
+  napi_value result;
+  napi_status status = napi_call_function(
+    _env, recv, _value, argc, args, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, result);
+}
+
+inline Value Function::MakeCallback(
+    napi_value recv,
+    const std::initializer_list<napi_value>& args,
+    napi_async_context context) const {
+  return MakeCallback(recv, args.size(), args.begin(), context);
+}
+
+inline Value Function::MakeCallback(
+    napi_value recv,
+    const std::vector<napi_value>& args,
+    napi_async_context context) const {
+  return MakeCallback(recv, args.size(), args.data(), context);
+}
+
+inline Value Function::MakeCallback(
+    napi_value recv,
+    size_t argc,
+    const napi_value* args,
+    napi_async_context context) const {
+  napi_value result;
+  napi_status status = napi_make_callback(
+    _env, context, recv, _value, argc, args, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, result);
+}
+
+inline Object Function::New(const std::initializer_list<napi_value>& args) const {
+  return New(args.size(), args.begin());
+}
+
+inline Object Function::New(const std::vector<napi_value>& args) const {
+  return New(args.size(), args.data());
+}
+
+inline Object Function::New(size_t argc, const napi_value* args) const {
+  napi_value result;
+  napi_status status = napi_new_instance(
+    _env, _value, argc, args, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Object());
+  return Object(_env, result);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Promise class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Promise::Deferred Promise::Deferred::New(napi_env env) {
+  return Promise::Deferred(env);
+}
+
+inline Promise::Deferred::Deferred(napi_env env) : _env(env) {
+  napi_status status = napi_create_promise(_env, &_deferred, &_promise);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline Promise Promise::Deferred::Promise() const {
+  return Napi::Promise(_env, _promise);
+}
+
+inline Napi::Env Promise::Deferred::Env() const {
+  return Napi::Env(_env);
+}
+
+inline void Promise::Deferred::Resolve(napi_value value) const {
+  napi_status status = napi_resolve_deferred(_env, _deferred, value);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline void Promise::Deferred::Reject(napi_value value) const {
+  napi_status status = napi_reject_deferred(_env, _deferred, value);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline Promise::Promise(napi_env env, napi_value value) : Object(env, value) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Buffer<T> class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline Buffer<T> Buffer<T>::New(napi_env env, size_t length) {
+  napi_value value;
+  void* data;
+  napi_status status = napi_create_buffer(env, length * sizeof (T), &data, &value);
+  NAPI_THROW_IF_FAILED(env, status, Buffer<T>());
+  return Buffer(env, value, length, static_cast<T*>(data));
+}
+
+template <typename T>
+inline Buffer<T> Buffer<T>::New(napi_env env, T* data, size_t length) {
+  napi_value value;
+  napi_status status = napi_create_external_buffer(
+    env, length * sizeof (T), data, nullptr, nullptr, &value);
+  NAPI_THROW_IF_FAILED(env, status, Buffer<T>());
+  return Buffer(env, value, length, data);
+}
+
+template <typename T>
+template <typename Finalizer>
+inline Buffer<T> Buffer<T>::New(napi_env env,
+                                T* data,
+                                size_t length,
+                                Finalizer finalizeCallback) {
+  napi_value value;
+  details::FinalizeData<T, Finalizer>* finalizeData =
+      new details::FinalizeData<T, Finalizer>(
+          {std::move(finalizeCallback), nullptr});
+  napi_status status = napi_create_external_buffer(
+    env,
+    length * sizeof (T),
+    data,
+    details::FinalizeData<T, Finalizer>::Wrapper,
+    finalizeData,
+    &value);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, Buffer());
+  }
+  return Buffer(env, value, length, data);
+}
+
+template <typename T>
+template <typename Finalizer, typename Hint>
+inline Buffer<T> Buffer<T>::New(napi_env env,
+                                T* data,
+                                size_t length,
+                                Finalizer finalizeCallback,
+                                Hint* finalizeHint) {
+  napi_value value;
+  details::FinalizeData<T, Finalizer, Hint>* finalizeData =
+      new details::FinalizeData<T, Finalizer, Hint>(
+          {std::move(finalizeCallback), finalizeHint});
+  napi_status status = napi_create_external_buffer(
+    env,
+    length * sizeof (T),
+    data,
+    details::FinalizeData<T, Finalizer, Hint>::WrapperWithHint,
+    finalizeData,
+    &value);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, Buffer());
+  }
+  return Buffer(env, value, length, data);
+}
+
+template <typename T>
+inline Buffer<T> Buffer<T>::Copy(napi_env env, const T* data, size_t length) {
+  napi_value value;
+  napi_status status = napi_create_buffer_copy(
+    env, length * sizeof (T), data, nullptr, &value);
+  NAPI_THROW_IF_FAILED(env, status, Buffer<T>());
+  return Buffer<T>(env, value);
+}
+
+template <typename T>
+inline Buffer<T>::Buffer() : Uint8Array(), _length(0), _data(nullptr) {
+}
+
+template <typename T>
+inline Buffer<T>::Buffer(napi_env env, napi_value value)
+  : Uint8Array(env, value), _length(0), _data(nullptr) {
+}
+
+template <typename T>
+inline Buffer<T>::Buffer(napi_env env, napi_value value, size_t length, T* data)
+  : Uint8Array(env, value), _length(length), _data(data) {
+}
+
+template <typename T>
+inline size_t Buffer<T>::Length() const {
+  EnsureInfo();
+  return _length;
+}
+
+template <typename T>
+inline T* Buffer<T>::Data() const {
+  EnsureInfo();
+  return _data;
+}
+
+template <typename T>
+inline void Buffer<T>::EnsureInfo() const {
+  // The Buffer instance may have been constructed from a napi_value whose
+  // length/data are not yet known. Fetch and cache these values just once,
+  // since they can never change during the lifetime of the Buffer.
+  if (_data == nullptr) {
+    size_t byteLength;
+    void* voidData;
+    napi_status status = napi_get_buffer_info(_env, _value, &voidData, &byteLength);
+    NAPI_THROW_IF_FAILED_VOID(_env, status);
+    _length = byteLength / sizeof (T);
+    _data = static_cast<T*>(voidData);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Error class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Error Error::New(napi_env env) {
+  napi_status status;
+  napi_value error = nullptr;
+  bool is_exception_pending;
+  const napi_extended_error_info* info;
+
+  // We must retrieve the last error info before doing anything else, because
+  // doing anything else will replace the last error info.
+  status = napi_get_last_error_info(env, &info);
+  NAPI_FATAL_IF_FAILED(status, "Error::New", "napi_get_last_error_info");
+
+  status = napi_is_exception_pending(env, &is_exception_pending);
+  NAPI_FATAL_IF_FAILED(status, "Error::New", "napi_is_exception_pending");
+
+  // A pending exception takes precedence over any internal error status.
+  if (is_exception_pending) {
+    status = napi_get_and_clear_last_exception(env, &error);
+    NAPI_FATAL_IF_FAILED(status, "Error::New", "napi_get_and_clear_last_exception");
+  }
+  else {
+    const char* error_message = info->error_message != nullptr ?
+      info->error_message : "Error in native callback";
+
+    napi_value message;
+    status = napi_create_string_utf8(
+      env,
+      error_message,
+      std::strlen(error_message),
+      &message);
+    NAPI_FATAL_IF_FAILED(status, "Error::New", "napi_create_string_utf8");
+
+    switch (info->error_code) {
+    case napi_object_expected:
+    case napi_string_expected:
+    case napi_boolean_expected:
+    case napi_number_expected:
+      status = napi_create_type_error(env, nullptr, message, &error);
+      break;
+    default:
+      status = napi_create_error(env, nullptr,  message, &error);
+      break;
+    }
+    NAPI_FATAL_IF_FAILED(status, "Error::New", "napi_create_error");
+  }
+
+  return Error(env, error);
+}
+
+inline Error Error::New(napi_env env, const char* message) {
+  return Error::New<Error>(env, message, std::strlen(message), napi_create_error);
+}
+
+inline Error Error::New(napi_env env, const std::string& message) {
+  return Error::New<Error>(env, message.c_str(), message.size(), napi_create_error);
+}
+
+inline NAPI_NO_RETURN void Error::Fatal(const char* location, const char* message) {
+  napi_fatal_error(location, NAPI_AUTO_LENGTH, message, NAPI_AUTO_LENGTH);
+}
+
+inline Error::Error() : ObjectReference() {
+}
+
+inline Error::Error(napi_env env, napi_value value) : ObjectReference(env, nullptr) {
+  if (value != nullptr) {
+    napi_status status = napi_create_reference(env, value, 1, &_ref);
+
+    // Avoid infinite recursion in the failure case.
+    // Don't try to construct & throw another Error instance.
+    NAPI_FATAL_IF_FAILED(status, "Error::Error", "napi_create_reference");
+  }
+}
+
+inline Error::Error(Error&& other) : ObjectReference(std::move(other)) {
+}
+
+inline Error& Error::operator =(Error&& other) {
+  static_cast<Reference<Object>*>(this)->operator=(std::move(other));
+  return *this;
+}
+
+inline Error::Error(const Error& other) : ObjectReference(other) {
+}
+
+inline Error& Error::operator =(const Error& other) {
+  Reset();
+
+  _env = other.Env();
+  HandleScope scope(_env);
+
+  napi_value value = other.Value();
+  if (value != nullptr) {
+    napi_status status = napi_create_reference(_env, value, 1, &_ref);
+    NAPI_THROW_IF_FAILED(_env, status, *this);
+  }
+
+  return *this;
+}
+
+inline const std::string& Error::Message() const NAPI_NOEXCEPT {
+  if (_message.size() == 0 && _env != nullptr) {
+#ifdef NAPI_CPP_EXCEPTIONS
+    try {
+      _message = Get("message").As<String>();
+    }
+    catch (...) {
+      // Catch all errors here, to include e.g. a std::bad_alloc from
+      // the std::string::operator=, because this method may not throw.
+    }
+#else // NAPI_CPP_EXCEPTIONS
+    _message = Get("message").As<String>();
+#endif // NAPI_CPP_EXCEPTIONS
+  }
+  return _message;
+}
+
+inline void Error::ThrowAsJavaScriptException() const {
+  HandleScope scope(_env);
+  if (!IsEmpty()) {
+
+    // We intentionally don't use `NAPI_THROW_*` macros here to ensure
+    // that there is no possible recursion as `ThrowAsJavaScriptException`
+    // is part of `NAPI_THROW_*` macro definition for noexcept.
+
+    napi_status status = napi_throw(_env, Value());
+
+#ifdef NAPI_CPP_EXCEPTIONS
+    if (status != napi_ok) {
+      throw Error::New(_env);
+    }
+#else // NAPI_CPP_EXCEPTIONS
+    NAPI_FATAL_IF_FAILED(status, "Error::ThrowAsJavaScriptException", "napi_throw");
+#endif // NAPI_CPP_EXCEPTIONS
+  }
+}
+
+#ifdef NAPI_CPP_EXCEPTIONS
+
+inline const char* Error::what() const NAPI_NOEXCEPT {
+  return Message().c_str();
+}
+
+#endif // NAPI_CPP_EXCEPTIONS
+
+template <typename TError>
+inline TError Error::New(napi_env env,
+                         const char* message,
+                         size_t length,
+                         create_error_fn create_error) {
+  napi_value str;
+  napi_status status = napi_create_string_utf8(env, message, length, &str);
+  NAPI_THROW_IF_FAILED(env, status, TError());
+
+  napi_value error;
+  status = create_error(env, nullptr, str, &error);
+  NAPI_THROW_IF_FAILED(env, status, TError());
+
+  return TError(env, error);
+}
+
+inline TypeError TypeError::New(napi_env env, const char* message) {
+  return Error::New<TypeError>(env, message, std::strlen(message), napi_create_type_error);
+}
+
+inline TypeError TypeError::New(napi_env env, const std::string& message) {
+  return Error::New<TypeError>(env, message.c_str(), message.size(), napi_create_type_error);
+}
+
+inline TypeError::TypeError() : Error() {
+}
+
+inline TypeError::TypeError(napi_env env, napi_value value) : Error(env, value) {
+}
+
+inline RangeError RangeError::New(napi_env env, const char* message) {
+  return Error::New<RangeError>(env, message, std::strlen(message), napi_create_range_error);
+}
+
+inline RangeError RangeError::New(napi_env env, const std::string& message) {
+  return Error::New<RangeError>(env, message.c_str(), message.size(), napi_create_range_error);
+}
+
+inline RangeError::RangeError() : Error() {
+}
+
+inline RangeError::RangeError(napi_env env, napi_value value) : Error(env, value) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Reference<T> class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline Reference<T> Reference<T>::New(const T& value, uint32_t initialRefcount) {
+  napi_env env = value.Env();
+  napi_value val = value;
+
+  if (val == nullptr) {
+    return Reference<T>(env, nullptr);
+  }
+
+  napi_ref ref;
+  napi_status status = napi_create_reference(env, value, initialRefcount, &ref);
+  NAPI_THROW_IF_FAILED(env, status, Reference<T>());
+
+  return Reference<T>(env, ref);
+}
+
+
+template <typename T>
+inline Reference<T>::Reference() : _env(nullptr), _ref(nullptr), _suppressDestruct(false) {
+}
+
+template <typename T>
+inline Reference<T>::Reference(napi_env env, napi_ref ref)
+  : _env(env), _ref(ref), _suppressDestruct(false) {
+}
+
+template <typename T>
+inline Reference<T>::~Reference() {
+  if (_ref != nullptr) {
+    if (!_suppressDestruct) {
+      napi_delete_reference(_env, _ref);
+    }
+
+    _ref = nullptr;
+  }
+}
+
+template <typename T>
+inline Reference<T>::Reference(Reference<T>&& other)
+  : _env(other._env), _ref(other._ref), _suppressDestruct(other._suppressDestruct) {
+  other._env = nullptr;
+  other._ref = nullptr;
+  other._suppressDestruct = false;
+}
+
+template <typename T>
+inline Reference<T>& Reference<T>::operator =(Reference<T>&& other) {
+  Reset();
+  _env = other._env;
+  _ref = other._ref;
+  _suppressDestruct = other._suppressDestruct;
+  other._env = nullptr;
+  other._ref = nullptr;
+  other._suppressDestruct = false;
+  return *this;
+}
+
+template <typename T>
+inline Reference<T>::Reference(const Reference<T>& other)
+  : _env(other._env), _ref(nullptr), _suppressDestruct(false) {
+  HandleScope scope(_env);
+
+  napi_value value = other.Value();
+  if (value != nullptr) {
+    // Copying is a limited scenario (currently only used for Error object) and always creates a
+    // strong reference to the given value even if the incoming reference is weak.
+    napi_status status = napi_create_reference(_env, value, 1, &_ref);
+    NAPI_FATAL_IF_FAILED(status, "Reference<T>::Reference", "napi_create_reference");
+  }
+}
+
+template <typename T>
+inline Reference<T>::operator napi_ref() const {
+  return _ref;
+}
+
+template <typename T>
+inline bool Reference<T>::operator ==(const Reference<T> &other) const {
+  HandleScope scope(_env);
+  return this->Value().StrictEquals(other.Value());
+}
+
+template <typename T>
+inline bool Reference<T>::operator !=(const Reference<T> &other) const {
+  return !this->operator ==(other);
+}
+
+template <typename T>
+inline Napi::Env Reference<T>::Env() const {
+  return Napi::Env(_env);
+}
+
+template <typename T>
+inline bool Reference<T>::IsEmpty() const {
+  return _ref == nullptr;
+}
+
+template <typename T>
+inline T Reference<T>::Value() const {
+  if (_ref == nullptr) {
+    return T(_env, nullptr);
+  }
+
+  napi_value value;
+  napi_status status = napi_get_reference_value(_env, _ref, &value);
+  NAPI_THROW_IF_FAILED(_env, status, T());
+  return T(_env, value);
+}
+
+template <typename T>
+inline uint32_t Reference<T>::Ref() {
+  uint32_t result;
+  napi_status status = napi_reference_ref(_env, _ref, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 1);
+  return result;
+}
+
+template <typename T>
+inline uint32_t Reference<T>::Unref() {
+  uint32_t result;
+  napi_status status = napi_reference_unref(_env, _ref, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 1);
+  return result;
+}
+
+template <typename T>
+inline void Reference<T>::Reset() {
+  if (_ref != nullptr) {
+    napi_status status = napi_delete_reference(_env, _ref);
+    NAPI_THROW_IF_FAILED_VOID(_env, status);
+    _ref = nullptr;
+  }
+}
+
+template <typename T>
+inline void Reference<T>::Reset(const T& value, uint32_t refcount) {
+  Reset();
+  _env = value.Env();
+
+  napi_value val = value;
+  if (val != nullptr) {
+    napi_status status = napi_create_reference(_env, value, refcount, &_ref);
+    NAPI_THROW_IF_FAILED_VOID(_env, status);
+  }
+}
+
+template <typename T>
+inline void Reference<T>::SuppressDestruct() {
+  _suppressDestruct = true;
+}
+
+template <typename T>
+inline Reference<T> Weak(T value) {
+  return Reference<T>::New(value, 0);
+}
+
+inline ObjectReference Weak(Object value) {
+  return Reference<Object>::New(value, 0);
+}
+
+inline FunctionReference Weak(Function value) {
+  return Reference<Function>::New(value, 0);
+}
+
+template <typename T>
+inline Reference<T> Persistent(T value) {
+  return Reference<T>::New(value, 1);
+}
+
+inline ObjectReference Persistent(Object value) {
+  return Reference<Object>::New(value, 1);
+}
+
+inline FunctionReference Persistent(Function value) {
+  return Reference<Function>::New(value, 1);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ObjectReference class
+////////////////////////////////////////////////////////////////////////////////
+
+inline ObjectReference::ObjectReference(): Reference<Object>() {
+}
+
+inline ObjectReference::ObjectReference(napi_env env, napi_ref ref): Reference<Object>(env, ref) {
+}
+
+inline ObjectReference::ObjectReference(Reference<Object>&& other)
+  : Reference<Object>(std::move(other)) {
+}
+
+inline ObjectReference& ObjectReference::operator =(Reference<Object>&& other) {
+  static_cast<Reference<Object>*>(this)->operator=(std::move(other));
+  return *this;
+}
+
+inline ObjectReference::ObjectReference(ObjectReference&& other)
+  : Reference<Object>(std::move(other)) {
+}
+
+inline ObjectReference& ObjectReference::operator =(ObjectReference&& other) {
+  static_cast<Reference<Object>*>(this)->operator=(std::move(other));
+  return *this;
+}
+
+inline ObjectReference::ObjectReference(const ObjectReference& other)
+  : Reference<Object>(other) {
+}
+
+inline Napi::Value ObjectReference::Get(const char* utf8name) const {
+  EscapableHandleScope scope(_env);
+  return scope.Escape(Value().Get(utf8name));
+}
+
+inline Napi::Value ObjectReference::Get(const std::string& utf8name) const {
+  EscapableHandleScope scope(_env);
+  return scope.Escape(Value().Get(utf8name));
+}
+
+inline bool ObjectReference::Set(const char* utf8name, napi_value value) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, value);
+}
+
+inline bool ObjectReference::Set(const char* utf8name, Napi::Value value) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, value);
+}
+
+inline bool ObjectReference::Set(const char* utf8name, const char* utf8value) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, utf8value);
+}
+
+inline bool ObjectReference::Set(const char* utf8name, bool boolValue) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, boolValue);
+}
+
+inline bool ObjectReference::Set(const char* utf8name, double numberValue) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, numberValue);
+}
+
+inline bool ObjectReference::Set(const std::string& utf8name,
+                                 napi_value value) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, value);
+}
+
+inline bool ObjectReference::Set(const std::string& utf8name,
+                                 Napi::Value value) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, value);
+}
+
+inline bool ObjectReference::Set(const std::string& utf8name,
+                                 std::string& utf8value) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, utf8value);
+}
+
+inline bool ObjectReference::Set(const std::string& utf8name, bool boolValue) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, boolValue);
+}
+
+inline bool ObjectReference::Set(const std::string& utf8name,
+                                 double numberValue) {
+  HandleScope scope(_env);
+  return Value().Set(utf8name, numberValue);
+}
+
+inline Napi::Value ObjectReference::Get(uint32_t index) const {
+  EscapableHandleScope scope(_env);
+  return scope.Escape(Value().Get(index));
+}
+
+inline bool ObjectReference::Set(uint32_t index, napi_value value) {
+  HandleScope scope(_env);
+  return Value().Set(index, value);
+}
+
+inline bool ObjectReference::Set(uint32_t index, Napi::Value value) {
+  HandleScope scope(_env);
+  return Value().Set(index, value);
+}
+
+inline bool ObjectReference::Set(uint32_t index, const char* utf8value) {
+  HandleScope scope(_env);
+  return Value().Set(index, utf8value);
+}
+
+inline bool ObjectReference::Set(uint32_t index, const std::string& utf8value) {
+  HandleScope scope(_env);
+  return Value().Set(index, utf8value);
+}
+
+inline bool ObjectReference::Set(uint32_t index, bool boolValue) {
+  HandleScope scope(_env);
+  return Value().Set(index, boolValue);
+}
+
+inline bool ObjectReference::Set(uint32_t index, double numberValue) {
+  HandleScope scope(_env);
+  return Value().Set(index, numberValue);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// FunctionReference class
+////////////////////////////////////////////////////////////////////////////////
+
+inline FunctionReference::FunctionReference(): Reference<Function>() {
+}
+
+inline FunctionReference::FunctionReference(napi_env env, napi_ref ref)
+  : Reference<Function>(env, ref) {
+}
+
+inline FunctionReference::FunctionReference(Reference<Function>&& other)
+  : Reference<Function>(std::move(other)) {
+}
+
+inline FunctionReference& FunctionReference::operator =(Reference<Function>&& other) {
+  static_cast<Reference<Function>*>(this)->operator=(std::move(other));
+  return *this;
+}
+
+inline FunctionReference::FunctionReference(FunctionReference&& other)
+  : Reference<Function>(std::move(other)) {
+}
+
+inline FunctionReference& FunctionReference::operator =(FunctionReference&& other) {
+  static_cast<Reference<Function>*>(this)->operator=(std::move(other));
+  return *this;
+}
+
+inline Napi::Value FunctionReference::operator ()(
+    const std::initializer_list<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  return scope.Escape(Value()(args));
+}
+
+inline Napi::Value FunctionReference::Call(const std::initializer_list<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().Call(args);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::Call(const std::vector<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().Call(args);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::Call(
+    napi_value recv, const std::initializer_list<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().Call(recv, args);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::Call(
+    napi_value recv, const std::vector<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().Call(recv, args);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::Call(
+    napi_value recv, size_t argc, const napi_value* args) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().Call(recv, argc, args);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::MakeCallback(
+    napi_value recv,
+    const std::initializer_list<napi_value>& args,
+    napi_async_context context) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().MakeCallback(recv, args, context);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::MakeCallback(
+    napi_value recv,
+    const std::vector<napi_value>& args,
+    napi_async_context context) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().MakeCallback(recv, args, context);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Napi::Value FunctionReference::MakeCallback(
+    napi_value recv,
+    size_t argc,
+    const napi_value* args,
+    napi_async_context context) const {
+  EscapableHandleScope scope(_env);
+  Napi::Value result = Value().MakeCallback(recv, argc, args, context);
+  if (scope.Env().IsExceptionPending()) {
+    return Value();
+  }
+  return scope.Escape(result);
+}
+
+inline Object FunctionReference::New(const std::initializer_list<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  return scope.Escape(Value().New(args)).As<Object>();
+}
+
+inline Object FunctionReference::New(const std::vector<napi_value>& args) const {
+  EscapableHandleScope scope(_env);
+  return scope.Escape(Value().New(args)).As<Object>();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// CallbackInfo class
+////////////////////////////////////////////////////////////////////////////////
+
+inline CallbackInfo::CallbackInfo(napi_env env, napi_callback_info info)
+    : _env(env), _info(info), _this(nullptr), _dynamicArgs(nullptr), _data(nullptr) {
+  _argc = _staticArgCount;
+  _argv = _staticArgs;
+  napi_status status = napi_get_cb_info(env, info, &_argc, _argv, &_this, &_data);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+
+  if (_argc > _staticArgCount) {
+    // Use either a fixed-size array (on the stack) or a dynamically-allocated
+    // array (on the heap) depending on the number of args.
+    _dynamicArgs = new napi_value[_argc];
+    _argv = _dynamicArgs;
+
+    status = napi_get_cb_info(env, info, &_argc, _argv, nullptr, nullptr);
+    NAPI_THROW_IF_FAILED_VOID(_env, status);
+  }
+}
+
+inline CallbackInfo::~CallbackInfo() {
+  if (_dynamicArgs != nullptr) {
+    delete[] _dynamicArgs;
+  }
+}
+
+inline Value CallbackInfo::NewTarget() const {
+  napi_value newTarget;
+  napi_status status = napi_get_new_target(_env, _info, &newTarget);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, newTarget);
+}
+
+inline bool CallbackInfo::IsConstructCall() const {
+  return !NewTarget().IsEmpty();
+}
+
+inline Napi::Env CallbackInfo::Env() const {
+  return Napi::Env(_env);
+}
+
+inline size_t CallbackInfo::Length() const {
+  return _argc;
+}
+
+inline const Value CallbackInfo::operator [](size_t index) const {
+  return index < _argc ? Value(_env, _argv[index]) : Env().Undefined();
+}
+
+inline Value CallbackInfo::This() const {
+  if (_this == nullptr) {
+    return Env().Undefined();
+  }
+  return Object(_env, _this);
+}
+
+inline void* CallbackInfo::Data() const {
+  return _data;
+}
+
+inline void CallbackInfo::SetData(void* data) {
+  _data = data;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PropertyDescriptor class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename PropertyDescriptor::GetterCallback Getter>
+PropertyDescriptor
+PropertyDescriptor::Accessor(const char* utf8name,
+                             napi_property_attributes attributes,
+                             void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+
+  desc.utf8name = utf8name;
+  desc.getter = details::TemplatedCallback<Getter>;
+  desc.attributes = attributes;
+  desc.data = data;
+
+  return desc;
+}
+
+template <typename PropertyDescriptor::GetterCallback Getter>
+PropertyDescriptor
+PropertyDescriptor::Accessor(const std::string& utf8name,
+                             napi_property_attributes attributes,
+                             void* data) {
+  return Accessor<Getter>(utf8name.c_str(), attributes, data);
+}
+
+template <typename PropertyDescriptor::GetterCallback Getter>
+PropertyDescriptor
+PropertyDescriptor::Accessor(Name name,
+                             napi_property_attributes attributes,
+                             void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+
+  desc.name = name;
+  desc.getter = details::TemplatedCallback<Getter>;
+  desc.attributes = attributes;
+  desc.data = data;
+
+  return desc;
+}
+
+template <
+typename PropertyDescriptor::GetterCallback Getter,
+typename PropertyDescriptor::SetterCallback Setter>
+PropertyDescriptor
+PropertyDescriptor::Accessor(const char* utf8name,
+                             napi_property_attributes attributes,
+                             void* data) {
+
+  napi_property_descriptor desc = napi_property_descriptor();
+
+  desc.utf8name = utf8name;
+  desc.getter = details::TemplatedCallback<Getter>;
+  desc.setter = details::TemplatedVoidCallback<Setter>;
+  desc.attributes = attributes;
+  desc.data = data;
+
+  return desc;
+}
+
+template <
+typename PropertyDescriptor::GetterCallback Getter,
+typename PropertyDescriptor::SetterCallback Setter>
+PropertyDescriptor
+PropertyDescriptor::Accessor(const std::string& utf8name,
+                             napi_property_attributes attributes,
+                             void* data) {
+  return Accessor<Getter, Setter>(utf8name.c_str(), attributes, data);
+}
+
+template <
+typename PropertyDescriptor::GetterCallback Getter,
+typename PropertyDescriptor::SetterCallback Setter>
+PropertyDescriptor
+PropertyDescriptor::Accessor(Name name,
+                             napi_property_attributes attributes,
+                             void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+
+  desc.name = name;
+  desc.getter = details::TemplatedCallback<Getter>;
+  desc.setter = details::TemplatedVoidCallback<Setter>;
+  desc.attributes = attributes;
+  desc.data = data;
+
+  return desc;
+}
+
+template <typename Getter>
+inline PropertyDescriptor
+PropertyDescriptor::Accessor(Napi::Env env,
+                             Napi::Object object,
+                             const char* utf8name,
+                             Getter getter,
+                             napi_property_attributes attributes,
+                             void* data) {
+  using CbData = details::CallbackData<Getter, Napi::Value>;
+  auto callbackData = new CbData({ getter, data });
+
+  napi_status status = AttachData(env, object, callbackData);
+  if (status != napi_ok) {
+    delete callbackData;
+    NAPI_THROW_IF_FAILED(env, status, napi_property_descriptor());
+  }
+
+  return PropertyDescriptor({
+    utf8name,
+    nullptr,
+    nullptr,
+    CbData::Wrapper,
+    nullptr,
+    nullptr,
+    attributes,
+    callbackData
+  });
+}
+
+template <typename Getter>
+inline PropertyDescriptor PropertyDescriptor::Accessor(Napi::Env env,
+                                                       Napi::Object object,
+                                                       const std::string& utf8name,
+                                                       Getter getter,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  return Accessor(env, object, utf8name.c_str(), getter, attributes, data);
+}
+
+template <typename Getter>
+inline PropertyDescriptor PropertyDescriptor::Accessor(Napi::Env env,
+                                                       Napi::Object object,
+                                                       Name name,
+                                                       Getter getter,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  using CbData = details::CallbackData<Getter, Napi::Value>;
+  auto callbackData = new CbData({ getter, data });
+
+  napi_status status = AttachData(env, object, callbackData);
+  if (status != napi_ok) {
+    delete callbackData;
+    NAPI_THROW_IF_FAILED(env, status, napi_property_descriptor());
+  }
+
+  return PropertyDescriptor({
+    nullptr,
+    name,
+    nullptr,
+    CbData::Wrapper,
+    nullptr,
+    nullptr,
+    attributes,
+    callbackData
+  });
+}
+
+template <typename Getter, typename Setter>
+inline PropertyDescriptor PropertyDescriptor::Accessor(Napi::Env env,
+                                                       Napi::Object object,
+                                                       const char* utf8name,
+                                                       Getter getter,
+                                                       Setter setter,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  using CbData = details::AccessorCallbackData<Getter, Setter>;
+  auto callbackData = new CbData({ getter, setter, data });
+
+  napi_status status = AttachData(env, object, callbackData);
+  if (status != napi_ok) {
+    delete callbackData;
+    NAPI_THROW_IF_FAILED(env, status, napi_property_descriptor());
+  }
+
+  return PropertyDescriptor({
+    utf8name,
+    nullptr,
+    nullptr,
+    CbData::GetterWrapper,
+    CbData::SetterWrapper,
+    nullptr,
+    attributes,
+    callbackData
+  });
+}
+
+template <typename Getter, typename Setter>
+inline PropertyDescriptor PropertyDescriptor::Accessor(Napi::Env env,
+                                                       Napi::Object object,
+                                                       const std::string& utf8name,
+                                                       Getter getter,
+                                                       Setter setter,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  return Accessor(env, object, utf8name.c_str(), getter, setter, attributes, data);
+}
+
+template <typename Getter, typename Setter>
+inline PropertyDescriptor PropertyDescriptor::Accessor(Napi::Env env,
+                                                       Napi::Object object,
+                                                       Name name,
+                                                       Getter getter,
+                                                       Setter setter,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  using CbData = details::AccessorCallbackData<Getter, Setter>;
+  auto callbackData = new CbData({ getter, setter, data });
+
+  napi_status status = AttachData(env, object, callbackData);
+  if (status != napi_ok) {
+    delete callbackData;
+    NAPI_THROW_IF_FAILED(env, status, napi_property_descriptor());
+  }
+
+  return PropertyDescriptor({
+    nullptr,
+    name,
+    nullptr,
+    CbData::GetterWrapper,
+    CbData::SetterWrapper,
+    nullptr,
+    attributes,
+    callbackData
+  });
+}
+
+template <typename Callable>
+inline PropertyDescriptor PropertyDescriptor::Function(Napi::Env env,
+                                                       Napi::Object /*object*/,
+                                                       const char* utf8name,
+                                                       Callable cb,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  return PropertyDescriptor({
+    utf8name,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    Napi::Function::New(env, cb, utf8name, data),
+    attributes,
+    nullptr
+  });
+}
+
+template <typename Callable>
+inline PropertyDescriptor PropertyDescriptor::Function(Napi::Env env,
+                                                       Napi::Object object,
+                                                       const std::string& utf8name,
+                                                       Callable cb,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  return Function(env, object, utf8name.c_str(), cb, attributes, data);
+}
+
+template <typename Callable>
+inline PropertyDescriptor PropertyDescriptor::Function(Napi::Env env,
+                                                       Napi::Object /*object*/,
+                                                       Name name,
+                                                       Callable cb,
+                                                       napi_property_attributes attributes,
+                                                       void* data) {
+  return PropertyDescriptor({
+    nullptr,
+    name,
+    nullptr,
+    nullptr,
+    nullptr,
+    Napi::Function::New(env, cb, nullptr, data),
+    attributes,
+    nullptr
+  });
+}
+
+inline PropertyDescriptor PropertyDescriptor::Value(const char* utf8name,
+                                                    napi_value value,
+                                                    napi_property_attributes attributes) {
+  return PropertyDescriptor({
+    utf8name, nullptr, nullptr, nullptr, nullptr, value, attributes, nullptr
+  });
+}
+
+inline PropertyDescriptor PropertyDescriptor::Value(const std::string& utf8name,
+                                                    napi_value value,
+                                                    napi_property_attributes attributes) {
+  return Value(utf8name.c_str(), value, attributes);
+}
+
+inline PropertyDescriptor PropertyDescriptor::Value(napi_value name,
+                                                    napi_value value,
+                                                    napi_property_attributes attributes) {
+  return PropertyDescriptor({
+    nullptr, name, nullptr, nullptr, nullptr, value, attributes, nullptr
+  });
+}
+
+inline PropertyDescriptor PropertyDescriptor::Value(Name name,
+                                                    Napi::Value value,
+                                                    napi_property_attributes attributes) {
+  napi_value nameValue = name;
+  napi_value valueValue = value;
+  return PropertyDescriptor::Value(nameValue, valueValue, attributes);
+}
+
+inline PropertyDescriptor::PropertyDescriptor(napi_property_descriptor desc)
+  : _desc(desc) {
+}
+
+inline PropertyDescriptor::operator napi_property_descriptor&() {
+  return _desc;
+}
+
+inline PropertyDescriptor::operator const napi_property_descriptor&() const {
+  return _desc;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// InstanceWrap<T> class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline void InstanceWrap<T>::AttachPropData(napi_env env,
+                                       napi_value value,
+                                       const napi_property_descriptor* prop) {
+  napi_status status;
+  if (!(prop->attributes & napi_static)) {
+    if (prop->method == T::InstanceVoidMethodCallbackWrapper) {
+      status = Napi::details::AttachData(env,
+                    value,
+                    static_cast<InstanceVoidMethodCallbackData*>(prop->data));
+      NAPI_THROW_IF_FAILED_VOID(env, status);
+    } else if (prop->method == T::InstanceMethodCallbackWrapper) {
+      status = Napi::details::AttachData(env,
+                        value,
+                        static_cast<InstanceMethodCallbackData*>(prop->data));
+      NAPI_THROW_IF_FAILED_VOID(env, status);
+    } else if (prop->getter == T::InstanceGetterCallbackWrapper ||
+        prop->setter == T::InstanceSetterCallbackWrapper) {
+      status = Napi::details::AttachData(env,
+                          value,
+                          static_cast<InstanceAccessorCallbackData*>(prop->data));
+      NAPI_THROW_IF_FAILED_VOID(env, status);
+    }
+  }
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    const char* utf8name,
+    InstanceVoidMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  InstanceVoidMethodCallbackData* callbackData =
+    new InstanceVoidMethodCallbackData({ method, data});
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = T::InstanceVoidMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    const char* utf8name,
+    InstanceMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  InstanceMethodCallbackData* callbackData = new InstanceMethodCallbackData({ method, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = T::InstanceMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    Symbol name,
+    InstanceVoidMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  InstanceVoidMethodCallbackData* callbackData =
+    new InstanceVoidMethodCallbackData({ method, data});
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = T::InstanceVoidMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    Symbol name,
+    InstanceMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  InstanceMethodCallbackData* callbackData = new InstanceMethodCallbackData({ method, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = T::InstanceMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceVoidMethodCallback method>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    const char* utf8name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = details::TemplatedInstanceVoidCallback<T, method>;
+  desc.data = data;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceMethodCallback method>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    const char* utf8name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = details::TemplatedInstanceCallback<T, method>;
+  desc.data = data;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceVoidMethodCallback method>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    Symbol name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = details::TemplatedInstanceVoidCallback<T, method>;
+  desc.data = data;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceMethodCallback method>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
+    Symbol name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = details::TemplatedInstanceCallback<T, method>;
+  desc.data = data;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceAccessor(
+    const char* utf8name,
+    InstanceGetterCallback getter,
+    InstanceSetterCallback setter,
+    napi_property_attributes attributes,
+    void* data) {
+  InstanceAccessorCallbackData* callbackData =
+    new InstanceAccessorCallbackData({ getter, setter, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.getter = getter != nullptr ? T::InstanceGetterCallbackWrapper : nullptr;
+  desc.setter = setter != nullptr ? T::InstanceSetterCallbackWrapper : nullptr;
+  desc.data = callbackData;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceAccessor(
+    Symbol name,
+    InstanceGetterCallback getter,
+    InstanceSetterCallback setter,
+    napi_property_attributes attributes,
+    void* data) {
+  InstanceAccessorCallbackData* callbackData =
+    new InstanceAccessorCallbackData({ getter, setter, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.getter = getter != nullptr ? T::InstanceGetterCallbackWrapper : nullptr;
+  desc.setter = setter != nullptr ? T::InstanceSetterCallbackWrapper : nullptr;
+  desc.data = callbackData;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceGetterCallback getter,
+          typename InstanceWrap<T>::InstanceSetterCallback setter>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceAccessor(
+    const char* utf8name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.getter = details::TemplatedInstanceCallback<T, getter>;
+  desc.setter = This::WrapSetter(This::SetterTag<setter>());
+  desc.data = data;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceGetterCallback getter,
+          typename InstanceWrap<T>::InstanceSetterCallback setter>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceAccessor(
+    Symbol name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.getter = details::TemplatedInstanceCallback<T, getter>;
+  desc.setter = This::WrapSetter(This::SetterTag<setter>());
+  desc.data = data;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceValue(
+    const char* utf8name,
+    Napi::Value value,
+    napi_property_attributes attributes) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.value = value;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceValue(
+    Symbol name,
+    Napi::Value value,
+    napi_property_attributes attributes) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.value = value;
+  desc.attributes = attributes;
+  return desc;
+}
+
+template <typename T>
+inline napi_value InstanceWrap<T>::InstanceVoidMethodCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    InstanceVoidMethodCallbackData* callbackData =
+      reinterpret_cast<InstanceVoidMethodCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    T* instance = T::Unwrap(callbackInfo.This().As<Object>());
+    auto cb = callbackData->callback;
+    (instance->*cb)(callbackInfo);
+    return nullptr;
+  });
+}
+
+template <typename T>
+inline napi_value InstanceWrap<T>::InstanceMethodCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    InstanceMethodCallbackData* callbackData =
+      reinterpret_cast<InstanceMethodCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    T* instance = T::Unwrap(callbackInfo.This().As<Object>());
+    auto cb = callbackData->callback;
+    return (instance->*cb)(callbackInfo);
+  });
+}
+
+template <typename T>
+inline napi_value InstanceWrap<T>::InstanceGetterCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    InstanceAccessorCallbackData* callbackData =
+      reinterpret_cast<InstanceAccessorCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    T* instance = T::Unwrap(callbackInfo.This().As<Object>());
+    auto cb = callbackData->getterCallback;
+    return (instance->*cb)(callbackInfo);
+  });
+}
+
+template <typename T>
+inline napi_value InstanceWrap<T>::InstanceSetterCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    InstanceAccessorCallbackData* callbackData =
+      reinterpret_cast<InstanceAccessorCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    T* instance = T::Unwrap(callbackInfo.This().As<Object>());
+    auto cb = callbackData->setterCallback;
+    (instance->*cb)(callbackInfo, callbackInfo[0]);
+    return nullptr;
+  });
+}
+
+template <typename T>
+template <typename InstanceWrap<T>::InstanceSetterCallback method>
+inline napi_value InstanceWrap<T>::WrappedMethod(
+    napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
+  return details::WrapCallback([&] {
+    const CallbackInfo cbInfo(env, info);
+    T* instance = T::Unwrap(cbInfo.This().As<Object>());
+    (instance->*method)(cbInfo, cbInfo[0]);
+    return nullptr;
+  });
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ObjectWrap<T> class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline ObjectWrap<T>::ObjectWrap(const Napi::CallbackInfo& callbackInfo) {
+  napi_env env = callbackInfo.Env();
+  napi_value wrapper = callbackInfo.This();
+  napi_status status;
+  napi_ref ref;
+  T* instance = static_cast<T*>(this);
+  status = napi_wrap(env, wrapper, instance, FinalizeCallback, nullptr, &ref);
+  NAPI_THROW_IF_FAILED_VOID(env, status);
+
+  Reference<Object>* instanceRef = instance;
+  *instanceRef = Reference<Object>(env, ref);
+}
+
+template <typename T>
+inline ObjectWrap<T>::~ObjectWrap() {
+  // If the JS object still exists at this point, remove the finalizer added
+  // through `napi_wrap()`.
+  if (!IsEmpty()) {
+    Object object = Value();
+    // It is not valid to call `napi_remove_wrap()` with an empty `object`.
+    // This happens e.g. during garbage collection.
+    if (!object.IsEmpty() && _construction_failed) {
+      napi_remove_wrap(Env(), object, nullptr);
+    }
+  }
+}
+
+template<typename T>
+inline T* ObjectWrap<T>::Unwrap(Object wrapper) {
+  T* unwrapped;
+  napi_status status = napi_unwrap(wrapper.Env(), wrapper, reinterpret_cast<void**>(&unwrapped));
+  NAPI_THROW_IF_FAILED(wrapper.Env(), status, nullptr);
+  return unwrapped;
+}
+
+template <typename T>
+inline Function
+ObjectWrap<T>::DefineClass(Napi::Env env,
+                           const char* utf8name,
+                           const size_t props_count,
+                           const napi_property_descriptor* descriptors,
+                           void* data) {
+  napi_status status;
+  std::vector<napi_property_descriptor> props(props_count);
+
+  // We copy the descriptors to a local array because before defining the class
+  // we must replace static method property descriptors with value property
+  // descriptors such that the value is a function-valued `napi_value` created
+  // with `CreateFunction()`.
+  //
+  // This replacement could be made for instance methods as well, but V8 aborts
+  // if we do that, because it expects methods defined on the prototype template
+  // to have `FunctionTemplate`s.
+  for (size_t index = 0; index < props_count; index++) {
+    props[index] = descriptors[index];
+    napi_property_descriptor* prop = &props[index];
+    if (prop->method == T::StaticMethodCallbackWrapper) {
+      status = CreateFunction(env,
+                             utf8name,
+                             prop->method,
+                             static_cast<StaticMethodCallbackData*>(prop->data),
+               &(prop->value));
+      NAPI_THROW_IF_FAILED(env, status, Function());
+      prop->method = nullptr;
+      prop->data = nullptr;
+    } else if (prop->method == T::StaticVoidMethodCallbackWrapper) {
+      status = CreateFunction(env,
+                         utf8name,
+                         prop->method,
+                         static_cast<StaticVoidMethodCallbackData*>(prop->data),
+                         &(prop->value));
+      NAPI_THROW_IF_FAILED(env, status, Function());
+      prop->method = nullptr;
+      prop->data = nullptr;
+    }
+  }
+
+  napi_value value;
+  status = napi_define_class(env,
+                             utf8name,
+                             NAPI_AUTO_LENGTH,
+                             T::ConstructorCallbackWrapper,
+                             data,
+                             props_count,
+                             props.data(),
+                             &value);
+  NAPI_THROW_IF_FAILED(env, status, Function());
+
+  // After defining the class we iterate once more over the property descriptors
+  // and attach the data associated with accessors and instance methods to the
+  // newly created JavaScript class.
+  for (size_t idx = 0; idx < props_count; idx++) {
+    const napi_property_descriptor* prop = &props[idx];
+
+    if (prop->getter == T::StaticGetterCallbackWrapper ||
+        prop->setter == T::StaticSetterCallbackWrapper) {
+      status = Napi::details::AttachData(env,
+                          value,
+                          static_cast<StaticAccessorCallbackData*>(prop->data));
+      NAPI_THROW_IF_FAILED(env, status, Function());
+    } else {
+      // InstanceWrap<T>::AttachPropData is responsible for attaching the data
+      // of instance methods and accessors.
+      T::AttachPropData(env, value, prop);
+    }
+  }
+
+  return Function(env, value);
+}
+
+template <typename T>
+inline Function ObjectWrap<T>::DefineClass(
+    Napi::Env env,
+    const char* utf8name,
+    const std::initializer_list<ClassPropertyDescriptor<T>>& properties,
+    void* data) {
+  return DefineClass(env,
+          utf8name,
+          properties.size(),
+          reinterpret_cast<const napi_property_descriptor*>(properties.begin()),
+          data);
+}
+
+template <typename T>
+inline Function ObjectWrap<T>::DefineClass(
+    Napi::Env env,
+    const char* utf8name,
+    const std::vector<ClassPropertyDescriptor<T>>& properties,
+    void* data) {
+  return DefineClass(env,
+           utf8name,
+           properties.size(),
+           reinterpret_cast<const napi_property_descriptor*>(properties.data()),
+           data);
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    const char* utf8name,
+    StaticVoidMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  StaticVoidMethodCallbackData* callbackData = new StaticVoidMethodCallbackData({ method, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = T::StaticVoidMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    const char* utf8name,
+    StaticMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  StaticMethodCallbackData* callbackData = new StaticMethodCallbackData({ method, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = T::StaticMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    Symbol name,
+    StaticVoidMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  StaticVoidMethodCallbackData* callbackData = new StaticVoidMethodCallbackData({ method, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = T::StaticVoidMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    Symbol name,
+    StaticMethodCallback method,
+    napi_property_attributes attributes,
+    void* data) {
+  StaticMethodCallbackData* callbackData = new StaticMethodCallbackData({ method, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = T::StaticMethodCallbackWrapper;
+  desc.data = callbackData;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticVoidMethodCallback method>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    const char* utf8name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = details::TemplatedVoidCallback<method>;
+  desc.data = data;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticVoidMethodCallback method>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    Symbol name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = details::TemplatedVoidCallback<method>;
+  desc.data = data;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticMethodCallback method>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    const char* utf8name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.method = details::TemplatedCallback<method>;
+  desc.data = data;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticMethodCallback method>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
+    Symbol name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.method = details::TemplatedCallback<method>;
+  desc.data = data;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticAccessor(
+    const char* utf8name,
+    StaticGetterCallback getter,
+    StaticSetterCallback setter,
+    napi_property_attributes attributes,
+    void* data) {
+  StaticAccessorCallbackData* callbackData =
+    new StaticAccessorCallbackData({ getter, setter, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.getter = getter != nullptr ? T::StaticGetterCallbackWrapper : nullptr;
+  desc.setter = setter != nullptr ? T::StaticSetterCallbackWrapper : nullptr;
+  desc.data = callbackData;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticAccessor(
+    Symbol name,
+    StaticGetterCallback getter,
+    StaticSetterCallback setter,
+    napi_property_attributes attributes,
+    void* data) {
+  StaticAccessorCallbackData* callbackData =
+    new StaticAccessorCallbackData({ getter, setter, data });
+
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.getter = getter != nullptr ? T::StaticGetterCallbackWrapper : nullptr;
+  desc.setter = setter != nullptr ? T::StaticSetterCallbackWrapper : nullptr;
+  desc.data = callbackData;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticGetterCallback getter,
+          typename ObjectWrap<T>::StaticSetterCallback setter>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticAccessor(
+    const char* utf8name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.getter = details::TemplatedCallback<getter>;
+  desc.setter = This::WrapStaticSetter(This::StaticSetterTag<setter>());
+  desc.data = data;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticGetterCallback getter,
+          typename ObjectWrap<T>::StaticSetterCallback setter>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticAccessor(
+    Symbol name,
+    napi_property_attributes attributes,
+    void* data) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.getter = details::TemplatedCallback<getter>;
+  desc.setter = This::WrapStaticSetter(This::StaticSetterTag<setter>());
+  desc.data = data;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticValue(const char* utf8name,
+    Napi::Value value, napi_property_attributes attributes) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.utf8name = utf8name;
+  desc.value = value;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticValue(Symbol name,
+    Napi::Value value, napi_property_attributes attributes) {
+  napi_property_descriptor desc = napi_property_descriptor();
+  desc.name = name;
+  desc.value = value;
+  desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
+  return desc;
+}
+
+template <typename T>
+inline void ObjectWrap<T>::Finalize(Napi::Env /*env*/) {}
+
+template <typename T>
+inline napi_value ObjectWrap<T>::ConstructorCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  napi_value new_target;
+  napi_status status = napi_get_new_target(env, info, &new_target);
+  if (status != napi_ok) return nullptr;
+
+  bool isConstructCall = (new_target != nullptr);
+  if (!isConstructCall) {
+    napi_throw_type_error(env, nullptr, "Class constructors cannot be invoked without 'new'");
+    return nullptr;
+  }
+
+  napi_value wrapper = details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    T* instance = new T(callbackInfo);
+#ifdef NAPI_CPP_EXCEPTIONS
+    instance->_construction_failed = false;
+#else
+    if (callbackInfo.Env().IsExceptionPending()) {
+      // We need to clear the exception so that removing the wrap might work.
+      Error e = callbackInfo.Env().GetAndClearPendingException();
+      delete instance;
+      e.ThrowAsJavaScriptException();
+    } else {
+      instance->_construction_failed = false;
+    }
+# endif  // NAPI_CPP_EXCEPTIONS
+    return callbackInfo.This();
+  });
+
+  return wrapper;
+}
+
+template <typename T>
+inline napi_value ObjectWrap<T>::StaticVoidMethodCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    StaticVoidMethodCallbackData* callbackData =
+      reinterpret_cast<StaticVoidMethodCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    callbackData->callback(callbackInfo);
+    return nullptr;
+  });
+}
+
+template <typename T>
+inline napi_value ObjectWrap<T>::StaticMethodCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    StaticMethodCallbackData* callbackData =
+      reinterpret_cast<StaticMethodCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    return callbackData->callback(callbackInfo);
+  });
+}
+
+template <typename T>
+inline napi_value ObjectWrap<T>::StaticGetterCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    StaticAccessorCallbackData* callbackData =
+      reinterpret_cast<StaticAccessorCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    return callbackData->getterCallback(callbackInfo);
+  });
+}
+
+template <typename T>
+inline napi_value ObjectWrap<T>::StaticSetterCallbackWrapper(
+    napi_env env,
+    napi_callback_info info) {
+  return details::WrapCallback([&] {
+    CallbackInfo callbackInfo(env, info);
+    StaticAccessorCallbackData* callbackData =
+      reinterpret_cast<StaticAccessorCallbackData*>(callbackInfo.Data());
+    callbackInfo.SetData(callbackData->data);
+    callbackData->setterCallback(callbackInfo, callbackInfo[0]);
+    return nullptr;
+  });
+}
+
+template <typename T>
+inline void ObjectWrap<T>::FinalizeCallback(napi_env env, void* data, void* /*hint*/) {
+  HandleScope scope(env);
+  T* instance = static_cast<T*>(data);
+  instance->Finalize(Napi::Env(env));
+  delete instance;
+}
+
+template <typename T>
+template <typename ObjectWrap<T>::StaticSetterCallback method>
+inline napi_value ObjectWrap<T>::WrappedMethod(
+    napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
+  return details::WrapCallback([&] {
+    const CallbackInfo cbInfo(env, info);
+    method(cbInfo, cbInfo[0]);
+    return nullptr;
+  });
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// HandleScope class
+////////////////////////////////////////////////////////////////////////////////
+
+inline HandleScope::HandleScope(napi_env env, napi_handle_scope scope)
+    : _env(env), _scope(scope) {
+}
+
+inline HandleScope::HandleScope(Napi::Env env) : _env(env) {
+  napi_status status = napi_open_handle_scope(_env, &_scope);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline HandleScope::~HandleScope() {
+  napi_status status = napi_close_handle_scope(_env, _scope);
+  NAPI_FATAL_IF_FAILED(status,
+                       "HandleScope::~HandleScope",
+                       "napi_close_handle_scope");
+}
+
+inline HandleScope::operator napi_handle_scope() const {
+  return _scope;
+}
+
+inline Napi::Env HandleScope::Env() const {
+  return Napi::Env(_env);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// EscapableHandleScope class
+////////////////////////////////////////////////////////////////////////////////
+
+inline EscapableHandleScope::EscapableHandleScope(
+  napi_env env, napi_escapable_handle_scope scope) : _env(env), _scope(scope) {
+}
+
+inline EscapableHandleScope::EscapableHandleScope(Napi::Env env) : _env(env) {
+  napi_status status = napi_open_escapable_handle_scope(_env, &_scope);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline EscapableHandleScope::~EscapableHandleScope() {
+  napi_status status = napi_close_escapable_handle_scope(_env, _scope);
+  NAPI_FATAL_IF_FAILED(status,
+                       "EscapableHandleScope::~EscapableHandleScope",
+                       "napi_close_escapable_handle_scope");
+}
+
+inline EscapableHandleScope::operator napi_escapable_handle_scope() const {
+  return _scope;
+}
+
+inline Napi::Env EscapableHandleScope::Env() const {
+  return Napi::Env(_env);
+}
+
+inline Value EscapableHandleScope::Escape(napi_value escapee) {
+  napi_value result;
+  napi_status status = napi_escape_handle(_env, _scope, escapee, &result);
+  NAPI_THROW_IF_FAILED(_env, status, Value());
+  return Value(_env, result);
+}
+
+
+#if (NAPI_VERSION > 2)
+////////////////////////////////////////////////////////////////////////////////
+// CallbackScope class
+////////////////////////////////////////////////////////////////////////////////
+
+inline CallbackScope::CallbackScope(
+  napi_env env, napi_callback_scope scope) : _env(env), _scope(scope) {
+}
+
+inline CallbackScope::CallbackScope(napi_env env, napi_async_context context)
+    : _env(env) {
+  napi_status status = napi_open_callback_scope(
+      _env, Object::New(env), context, &_scope);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline CallbackScope::~CallbackScope() {
+  napi_status status = napi_close_callback_scope(_env, _scope);
+  NAPI_FATAL_IF_FAILED(status,
+                       "CallbackScope::~CallbackScope",
+                       "napi_close_callback_scope");
+}
+
+inline CallbackScope::operator napi_callback_scope() const {
+  return _scope;
+}
+
+inline Napi::Env CallbackScope::Env() const {
+  return Napi::Env(_env);
+}
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// AsyncContext class
+////////////////////////////////////////////////////////////////////////////////
+
+inline AsyncContext::AsyncContext(napi_env env, const char* resource_name)
+  : AsyncContext(env, resource_name, Object::New(env)) {
+}
+
+inline AsyncContext::AsyncContext(napi_env env,
+                                  const char* resource_name,
+                                  const Object& resource)
+    : _env(env), _context(nullptr) {
+  napi_value resource_id;
+  napi_status status = napi_create_string_utf8(
+      _env, resource_name, NAPI_AUTO_LENGTH, &resource_id);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+
+  status = napi_async_init(_env, resource, resource_id, &_context);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline AsyncContext::~AsyncContext() {
+  if (_context != nullptr) {
+    napi_async_destroy(_env, _context);
+    _context = nullptr;
+  }
+}
+
+inline AsyncContext::AsyncContext(AsyncContext&& other) {
+  _env = other._env;
+  other._env = nullptr;
+  _context = other._context;
+  other._context = nullptr;
+}
+
+inline AsyncContext& AsyncContext::operator =(AsyncContext&& other) {
+  _env = other._env;
+  other._env = nullptr;
+  _context = other._context;
+  other._context = nullptr;
+  return *this;
+}
+
+inline AsyncContext::operator napi_async_context() const {
+  return _context;
+}
+
+inline Napi::Env AsyncContext::Env() const {
+  return Napi::Env(_env);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AsyncWorker class
+////////////////////////////////////////////////////////////////////////////////
+
+inline AsyncWorker::AsyncWorker(const Function& callback)
+  : AsyncWorker(callback, "generic") {
+}
+
+inline AsyncWorker::AsyncWorker(const Function& callback,
+                                const char* resource_name)
+  : AsyncWorker(callback, resource_name, Object::New(callback.Env())) {
+}
+
+inline AsyncWorker::AsyncWorker(const Function& callback,
+                                const char* resource_name,
+                                const Object& resource)
+  : AsyncWorker(Object::New(callback.Env()),
+                callback,
+                resource_name,
+                resource) {
+}
+
+inline AsyncWorker::AsyncWorker(const Object& receiver,
+                                const Function& callback)
+  : AsyncWorker(receiver, callback, "generic") {
+}
+
+inline AsyncWorker::AsyncWorker(const Object& receiver,
+                                const Function& callback,
+                                const char* resource_name)
+  : AsyncWorker(receiver,
+                callback,
+                resource_name,
+                Object::New(callback.Env())) {
+}
+
+inline AsyncWorker::AsyncWorker(const Object& receiver,
+                                const Function& callback,
+                                const char* resource_name,
+                                const Object& resource)
+  : _env(callback.Env()),
+    _receiver(Napi::Persistent(receiver)),
+    _callback(Napi::Persistent(callback)),
+    _suppress_destruct(false) {
+  napi_value resource_id;
+  napi_status status = napi_create_string_latin1(
+      _env, resource_name, NAPI_AUTO_LENGTH, &resource_id);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+
+  status = napi_create_async_work(_env, resource, resource_id, OnAsyncWorkExecute,
+                                  OnAsyncWorkComplete, this, &_work);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline AsyncWorker::AsyncWorker(Napi::Env env)
+  : AsyncWorker(env, "generic") {
+}
+
+inline AsyncWorker::AsyncWorker(Napi::Env env,
+                                const char* resource_name)
+  : AsyncWorker(env, resource_name, Object::New(env)) {
+}
+
+inline AsyncWorker::AsyncWorker(Napi::Env env,
+                                const char* resource_name,
+                                const Object& resource)
+  : _env(env),
+    _receiver(),
+    _callback(),
+    _suppress_destruct(false) {
+  napi_value resource_id;
+  napi_status status = napi_create_string_latin1(
+      _env, resource_name, NAPI_AUTO_LENGTH, &resource_id);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+
+  status = napi_create_async_work(_env, resource, resource_id, OnAsyncWorkExecute,
+                                  OnAsyncWorkComplete, this, &_work);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline AsyncWorker::~AsyncWorker() {
+  if (_work != nullptr) {
+    napi_delete_async_work(_env, _work);
+    _work = nullptr;
+  }
+}
+
+inline void AsyncWorker::Destroy() {
+  delete this;
+}
+
+inline AsyncWorker::AsyncWorker(AsyncWorker&& other) {
+  _env = other._env;
+  other._env = nullptr;
+  _work = other._work;
+  other._work = nullptr;
+  _receiver = std::move(other._receiver);
+  _callback = std::move(other._callback);
+  _error = std::move(other._error);
+  _suppress_destruct = other._suppress_destruct;
+}
+
+inline AsyncWorker& AsyncWorker::operator =(AsyncWorker&& other) {
+  _env = other._env;
+  other._env = nullptr;
+  _work = other._work;
+  other._work = nullptr;
+  _receiver = std::move(other._receiver);
+  _callback = std::move(other._callback);
+  _error = std::move(other._error);
+  _suppress_destruct = other._suppress_destruct;
+  return *this;
+}
+
+inline AsyncWorker::operator napi_async_work() const {
+  return _work;
+}
+
+inline Napi::Env AsyncWorker::Env() const {
+  return Napi::Env(_env);
+}
+
+inline void AsyncWorker::Queue() {
+  napi_status status = napi_queue_async_work(_env, _work);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline void AsyncWorker::Cancel() {
+  napi_status status = napi_cancel_async_work(_env, _work);
+  NAPI_THROW_IF_FAILED_VOID(_env, status);
+}
+
+inline ObjectReference& AsyncWorker::Receiver() {
+  return _receiver;
+}
+
+inline FunctionReference& AsyncWorker::Callback() {
+  return _callback;
+}
+
+inline void AsyncWorker::SuppressDestruct() {
+  _suppress_destruct = true;
+}
+
+inline void AsyncWorker::OnOK() {
+  if (!_callback.IsEmpty()) {
+    _callback.Call(_receiver.Value(), GetResult(_callback.Env()));
+  }
+}
+
+inline void AsyncWorker::OnError(const Error& e) {
+  if (!_callback.IsEmpty()) {
+    _callback.Call(_receiver.Value(), std::initializer_list<napi_value>{ e.Value() });
+  }
+}
+
+inline void AsyncWorker::SetError(const std::string& error) {
+  _error = error;
+}
+
+inline std::vector<napi_value> AsyncWorker::GetResult(Napi::Env /*env*/) {
+  return {};
+}
+// The OnAsyncWorkExecute method receives an napi_env argument. However, do NOT
+// use it within this method, as it does not run on the JavaScript thread and
+// must not run any method that would cause JavaScript to run. In practice,
+// this means that almost any use of napi_env will be incorrect.
+inline void AsyncWorker::OnAsyncWorkExecute(napi_env env, void* asyncworker) {
+  AsyncWorker* self = static_cast<AsyncWorker*>(asyncworker);
+  self->OnExecute(env);
+}
+// The OnExecute method receives an napi_env argument. However, do NOT
+// use it within this method, as it does not run on the JavaScript thread and
+// must not run any method that would cause JavaScript to run. In practice,
+// this means that almost any use of napi_env will be incorrect.
+inline void AsyncWorker::OnExecute(Napi::Env /*DO_NOT_USE*/) {
+#ifdef NAPI_CPP_EXCEPTIONS
+  try {
+    Execute();
+  } catch (const std::exception& e) {
+    SetError(e.what());
+  }
+#else // NAPI_CPP_EXCEPTIONS
+  Execute();
+#endif // NAPI_CPP_EXCEPTIONS
+}
+
+inline void AsyncWorker::OnAsyncWorkComplete(napi_env env,
+                                             napi_status status,
+                                             void* asyncworker) {
+  AsyncWorker* self = static_cast<AsyncWorker*>(asyncworker);
+  self->OnWorkComplete(env, status);
+}
+inline void AsyncWorker::OnWorkComplete(Napi::Env /*env*/, napi_status status) {
+  if (status != napi_cancelled) {
+    HandleScope scope(_env);
+    details::WrapCallback([&] {
+      if (_error.size() == 0) {
+        OnOK();
+      }
+      else {
+        OnError(Error::New(_env, _error));
+      }
+      return nullptr;
+    });
+  }
+  if (!_suppress_destruct) {
+    Destroy();
+  }
+}
+
+#if (NAPI_VERSION > 3 && !defined(__wasm32__))
+////////////////////////////////////////////////////////////////////////////////
+// TypedThreadSafeFunction<ContextType,DataType,CallJs> class
+////////////////////////////////////////////////////////////////////////////////
+
+// Starting with NAPI 5, the JavaScript function `func` parameter of
+// `napi_create_threadsafe_function` is optional.
+#if NAPI_VERSION > 4
+// static, with Callback [missing] Resource [missing] Finalizer [missing]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  napi_status status =
+      napi_create_threadsafe_function(env,
+                                      nullptr,
+                                      nullptr,
+                                      String::From(env, resourceName),
+                                      maxQueueSize,
+                                      initialThreadCount,
+                                      nullptr,
+                                      nullptr,
+                                      context,
+                                      CallJsInternal,
+                                      &tsfn._tsfn);
+  if (status != napi_ok) {
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+// static, with Callback [missing] Resource [passed] Finalizer [missing]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    const Object& resource,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  napi_status status =
+      napi_create_threadsafe_function(env,
+                                      nullptr,
+                                      resource,
+                                      String::From(env, resourceName),
+                                      maxQueueSize,
+                                      initialThreadCount,
+                                      nullptr,
+                                      nullptr,
+                                      context,
+                                      CallJsInternal,
+                                      &tsfn._tsfn);
+  if (status != napi_ok) {
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+// static, with Callback [missing] Resource [missing] Finalizer [passed]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString,
+          typename Finalizer,
+          typename FinalizerDataType>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context,
+    Finalizer finalizeCallback,
+    FinalizerDataType* data) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  auto* finalizeData = new details::
+      ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>(
+          {data, finalizeCallback});
+  napi_status status = napi_create_threadsafe_function(
+      env,
+      nullptr,
+      nullptr,
+      String::From(env, resourceName),
+      maxQueueSize,
+      initialThreadCount,
+      finalizeData,
+      details::ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>::
+          FinalizeFinalizeWrapperWithDataAndContext,
+      context,
+      CallJsInternal,
+      &tsfn._tsfn);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+// static, with Callback [missing] Resource [passed] Finalizer [passed]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString,
+          typename Finalizer,
+          typename FinalizerDataType>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    const Object& resource,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context,
+    Finalizer finalizeCallback,
+    FinalizerDataType* data) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  auto* finalizeData = new details::
+      ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>(
+          {data, finalizeCallback});
+  napi_status status = napi_create_threadsafe_function(
+      env,
+      nullptr,
+      resource,
+      String::From(env, resourceName),
+      maxQueueSize,
+      initialThreadCount,
+      finalizeData,
+      details::ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>::
+          FinalizeFinalizeWrapperWithDataAndContext,
+      context,
+      CallJsInternal,
+      &tsfn._tsfn);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+#endif
+
+// static, with Callback [passed] Resource [missing] Finalizer [missing]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    const Function& callback,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  napi_status status =
+      napi_create_threadsafe_function(env,
+                                      callback,
+                                      nullptr,
+                                      String::From(env, resourceName),
+                                      maxQueueSize,
+                                      initialThreadCount,
+                                      nullptr,
+                                      nullptr,
+                                      context,
+                                      CallJsInternal,
+                                      &tsfn._tsfn);
+  if (status != napi_ok) {
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+// static, with Callback [passed] Resource [passed] Finalizer [missing]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    const Function& callback,
+    const Object& resource,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  napi_status status =
+      napi_create_threadsafe_function(env,
+                                      callback,
+                                      resource,
+                                      String::From(env, resourceName),
+                                      maxQueueSize,
+                                      initialThreadCount,
+                                      nullptr,
+                                      nullptr,
+                                      context,
+                                      CallJsInternal,
+                                      &tsfn._tsfn);
+  if (status != napi_ok) {
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+// static, with Callback [passed] Resource [missing] Finalizer [passed]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename ResourceString,
+          typename Finalizer,
+          typename FinalizerDataType>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    const Function& callback,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context,
+    Finalizer finalizeCallback,
+    FinalizerDataType* data) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  auto* finalizeData = new details::
+      ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>(
+          {data, finalizeCallback});
+  napi_status status = napi_create_threadsafe_function(
+      env,
+      callback,
+      nullptr,
+      String::From(env, resourceName),
+      maxQueueSize,
+      initialThreadCount,
+      finalizeData,
+      details::ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>::
+          FinalizeFinalizeWrapperWithDataAndContext,
+      context,
+      CallJsInternal,
+      &tsfn._tsfn);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+// static, with: Callback [passed] Resource [passed] Finalizer [passed]
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+template <typename CallbackType,
+          typename ResourceString,
+          typename Finalizer,
+          typename FinalizerDataType>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::New(
+    napi_env env,
+    CallbackType callback,
+    const Object& resource,
+    ResourceString resourceName,
+    size_t maxQueueSize,
+    size_t initialThreadCount,
+    ContextType* context,
+    Finalizer finalizeCallback,
+    FinalizerDataType* data) {
+  TypedThreadSafeFunction<ContextType, DataType, CallJs> tsfn;
+
+  auto* finalizeData = new details::
+      ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>(
+          {data, finalizeCallback});
+  napi_status status = napi_create_threadsafe_function(
+      env,
+      details::DefaultCallbackWrapper<
+          CallbackType,
+          TypedThreadSafeFunction<ContextType, DataType, CallJs>>(env,
+                                                                  callback),
+      resource,
+      String::From(env, resourceName),
+      maxQueueSize,
+      initialThreadCount,
+      finalizeData,
+      details::ThreadSafeFinalize<ContextType, Finalizer, FinalizerDataType>::
+          FinalizeFinalizeWrapperWithDataAndContext,
+      context,
+      CallJsInternal,
+      &tsfn._tsfn);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(
+        env, status, TypedThreadSafeFunction<ContextType, DataType, CallJs>());
+  }
+
+  return tsfn;
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>::
+    TypedThreadSafeFunction()
+    : _tsfn() {}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>::
+    TypedThreadSafeFunction(napi_threadsafe_function tsfn)
+    : _tsfn(tsfn) {}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline TypedThreadSafeFunction<ContextType, DataType, CallJs>::
+operator napi_threadsafe_function() const {
+  return _tsfn;
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline napi_status
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::BlockingCall(
+    DataType* data) const {
+  return napi_call_threadsafe_function(_tsfn, data, napi_tsfn_blocking);
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline napi_status
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::NonBlockingCall(
+    DataType* data) const {
+  return napi_call_threadsafe_function(_tsfn, data, napi_tsfn_nonblocking);
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline void TypedThreadSafeFunction<ContextType, DataType, CallJs>::Ref(
+    napi_env env) const {
+  if (_tsfn != nullptr) {
+    napi_status status = napi_ref_threadsafe_function(env, _tsfn);
+    NAPI_THROW_IF_FAILED_VOID(env, status);
+  }
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline void TypedThreadSafeFunction<ContextType, DataType, CallJs>::Unref(
+    napi_env env) const {
+  if (_tsfn != nullptr) {
+    napi_status status = napi_unref_threadsafe_function(env, _tsfn);
+    NAPI_THROW_IF_FAILED_VOID(env, status);
+  }
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline napi_status
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::Acquire() const {
+  return napi_acquire_threadsafe_function(_tsfn);
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline napi_status
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::Release() {
+  return napi_release_threadsafe_function(_tsfn, napi_tsfn_release);
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline napi_status
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::Abort() {
+  return napi_release_threadsafe_function(_tsfn, napi_tsfn_abort);
+}
+
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+inline ContextType*
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::GetContext() const {
+  void* context;
+  napi_status status = napi_get_threadsafe_function_context(_tsfn, &context);
+  NAPI_FATAL_IF_FAILED(status,
+                       "TypedThreadSafeFunction::GetContext",
+                       "napi_get_threadsafe_function_context");
+  return static_cast<ContextType*>(context);
+}
+
+// static
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+void TypedThreadSafeFunction<ContextType, DataType, CallJs>::CallJsInternal(
+    napi_env env, napi_value jsCallback, void* context, void* data) {
+  details::CallJsWrapper<ContextType, DataType, decltype(CallJs), CallJs>(
+      env, jsCallback, context, data);
+}
+
+#if NAPI_VERSION == 4
+// static
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+Napi::Function
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::EmptyFunctionFactory(
+    Napi::Env env) {
+  return Napi::Function::New(env, [](const CallbackInfo& cb) {});
+}
+
+// static
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+Napi::Function
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::FunctionOrEmpty(
+    Napi::Env env, Napi::Function& callback) {
+  if (callback.IsEmpty()) {
+    return EmptyFunctionFactory(env);
+  }
+  return callback;
+}
+
+#else
+// static
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+std::nullptr_t
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::EmptyFunctionFactory(
+    Napi::Env /*env*/) {
+  return nullptr;
+}
+
+// static
+template <typename ContextType,
+          typename DataType,
+          void (*CallJs)(Napi::Env, Napi::Function, ContextType*, DataType*)>
+Napi::Function
+TypedThreadSafeFunction<ContextType, DataType, CallJs>::FunctionOrEmpty(
+    Napi::Env /*env*/, Napi::Function& callback) {
+  return callback;
+}
+
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// ThreadSafeFunction class
+////////////////////////////////////////////////////////////////////////////////
+
+// static
+template <typename ResourceString>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount) {
+  return New(env, callback, Object(), resourceName, maxQueueSize,
+             initialThreadCount);
+}
+
+// static
+template <typename ResourceString, typename ContextType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  ContextType* context) {
+  return New(env, callback, Object(), resourceName, maxQueueSize,
+             initialThreadCount, context);
+}
+
+// static
+template <typename ResourceString, typename Finalizer>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  Finalizer finalizeCallback) {
+  return New(env, callback, Object(), resourceName, maxQueueSize,
+             initialThreadCount, finalizeCallback);
+}
+
+// static
+template <typename ResourceString, typename Finalizer,
+          typename FinalizerDataType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  Finalizer finalizeCallback,
+                                  FinalizerDataType* data) {
+  return New(env, callback, Object(), resourceName, maxQueueSize,
+             initialThreadCount, finalizeCallback, data);
+}
+
+// static
+template <typename ResourceString, typename ContextType, typename Finalizer>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  ContextType* context,
+                                  Finalizer finalizeCallback) {
+  return New(env, callback, Object(), resourceName, maxQueueSize,
+             initialThreadCount, context, finalizeCallback);
+}
+
+// static
+template <typename ResourceString, typename ContextType,
+          typename Finalizer, typename FinalizerDataType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                                  const Function& callback,
+                                                  ResourceString resourceName,
+                                                  size_t maxQueueSize,
+                                                  size_t initialThreadCount,
+                                                  ContextType* context,
+                                                  Finalizer finalizeCallback,
+                                                  FinalizerDataType* data) {
+  return New(env, callback, Object(), resourceName, maxQueueSize,
+             initialThreadCount, context, finalizeCallback, data);
+}
+
+// static
+template <typename ResourceString>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  const Object& resource,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount) {
+  return New(env, callback, resource, resourceName, maxQueueSize,
+             initialThreadCount, static_cast<void*>(nullptr) /* context */);
+}
+
+// static
+template <typename ResourceString, typename ContextType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  const Object& resource,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  ContextType* context) {
+  return New(env, callback, resource, resourceName, maxQueueSize,
+             initialThreadCount, context,
+             [](Env, ContextType*) {} /* empty finalizer */);
+}
+
+// static
+template <typename ResourceString, typename Finalizer>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  const Object& resource,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  Finalizer finalizeCallback) {
+  return New(env, callback, resource, resourceName, maxQueueSize,
+             initialThreadCount, static_cast<void*>(nullptr) /* context */,
+             finalizeCallback, static_cast<void*>(nullptr) /* data */,
+             details::ThreadSafeFinalize<void, Finalizer>::Wrapper);
+}
+
+// static
+template <typename ResourceString, typename Finalizer,
+          typename FinalizerDataType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  const Object& resource,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  Finalizer finalizeCallback,
+                                  FinalizerDataType* data) {
+  return New(env, callback, resource, resourceName, maxQueueSize,
+             initialThreadCount, static_cast<void*>(nullptr) /* context */,
+             finalizeCallback, data,
+             details::ThreadSafeFinalize<
+                 void, Finalizer, FinalizerDataType>::FinalizeWrapperWithData);
+}
+
+// static
+template <typename ResourceString, typename ContextType, typename Finalizer>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                  const Function& callback,
+                                  const Object& resource,
+                                  ResourceString resourceName,
+                                  size_t maxQueueSize,
+                                  size_t initialThreadCount,
+                                  ContextType* context,
+                                  Finalizer finalizeCallback) {
+  return New(env, callback, resource, resourceName, maxQueueSize,
+             initialThreadCount, context, finalizeCallback,
+             static_cast<void*>(nullptr) /* data */,
+             details::ThreadSafeFinalize<
+                 ContextType, Finalizer>::FinalizeWrapperWithContext);
+}
+
+// static
+template <typename ResourceString, typename ContextType,
+          typename Finalizer, typename FinalizerDataType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                                  const Function& callback,
+                                                  const Object& resource,
+                                                  ResourceString resourceName,
+                                                  size_t maxQueueSize,
+                                                  size_t initialThreadCount,
+                                                  ContextType* context,
+                                                  Finalizer finalizeCallback,
+                                                  FinalizerDataType* data) {
+  return New(env, callback, resource, resourceName, maxQueueSize,
+             initialThreadCount, context, finalizeCallback, data,
+             details::ThreadSafeFinalize<ContextType, Finalizer,
+                 FinalizerDataType>::FinalizeFinalizeWrapperWithDataAndContext);
+}
+
+inline ThreadSafeFunction::ThreadSafeFunction()
+  : _tsfn() {
+}
+
+inline ThreadSafeFunction::ThreadSafeFunction(
+    napi_threadsafe_function tsfn)
+  : _tsfn(tsfn) {
+}
+
+inline ThreadSafeFunction::operator napi_threadsafe_function() const {
+  return _tsfn;
+}
+
+inline napi_status ThreadSafeFunction::BlockingCall() const {
+  return CallInternal(nullptr, napi_tsfn_blocking);
+}
+
+template <>
+inline napi_status ThreadSafeFunction::BlockingCall(
+    void* data) const {
+  return napi_call_threadsafe_function(_tsfn, data, napi_tsfn_blocking);
+}
+
+template <typename Callback>
+inline napi_status ThreadSafeFunction::BlockingCall(
+    Callback callback) const {
+  return CallInternal(new CallbackWrapper(callback), napi_tsfn_blocking);
+}
+
+template <typename DataType, typename Callback>
+inline napi_status ThreadSafeFunction::BlockingCall(
+    DataType* data, Callback callback) const {
+  auto wrapper = [data, callback](Env env, Function jsCallback) {
+    callback(env, jsCallback, data);
+  };
+  return CallInternal(new CallbackWrapper(wrapper), napi_tsfn_blocking);
+}
+
+inline napi_status ThreadSafeFunction::NonBlockingCall() const {
+  return CallInternal(nullptr, napi_tsfn_nonblocking);
+}
+
+template <>
+inline napi_status ThreadSafeFunction::NonBlockingCall(
+    void* data) const {
+  return napi_call_threadsafe_function(_tsfn, data, napi_tsfn_nonblocking);
+}
+
+template <typename Callback>
+inline napi_status ThreadSafeFunction::NonBlockingCall(
+    Callback callback) const {
+  return CallInternal(new CallbackWrapper(callback), napi_tsfn_nonblocking);
+}
+
+template <typename DataType, typename Callback>
+inline napi_status ThreadSafeFunction::NonBlockingCall(
+    DataType* data, Callback callback) const {
+  auto wrapper = [data, callback](Env env, Function jsCallback) {
+    callback(env, jsCallback, data);
+  };
+  return CallInternal(new CallbackWrapper(wrapper), napi_tsfn_nonblocking);
+}
+
+inline void ThreadSafeFunction::Ref(napi_env env) const {
+  if (_tsfn != nullptr) {
+    napi_status status = napi_ref_threadsafe_function(env, _tsfn);
+    NAPI_THROW_IF_FAILED_VOID(env, status);
+  }
+}
+
+inline void ThreadSafeFunction::Unref(napi_env env) const {
+  if (_tsfn != nullptr) {
+    napi_status status = napi_unref_threadsafe_function(env, _tsfn);
+    NAPI_THROW_IF_FAILED_VOID(env, status);
+  }
+}
+
+inline napi_status ThreadSafeFunction::Acquire() const {
+  return napi_acquire_threadsafe_function(_tsfn);
+}
+
+inline napi_status ThreadSafeFunction::Release() {
+  return napi_release_threadsafe_function(_tsfn, napi_tsfn_release);
+}
+
+inline napi_status ThreadSafeFunction::Abort() {
+  return napi_release_threadsafe_function(_tsfn, napi_tsfn_abort);
+}
+
+inline ThreadSafeFunction::ConvertibleContext
+ThreadSafeFunction::GetContext() const {
+  void* context;
+  napi_status status = napi_get_threadsafe_function_context(_tsfn, &context);
+  NAPI_FATAL_IF_FAILED(status, "ThreadSafeFunction::GetContext", "napi_get_threadsafe_function_context");
+  return ConvertibleContext({ context });
+}
+
+// static
+template <typename ResourceString, typename ContextType,
+          typename Finalizer, typename FinalizerDataType>
+inline ThreadSafeFunction ThreadSafeFunction::New(napi_env env,
+                                                  const Function& callback,
+                                                  const Object& resource,
+                                                  ResourceString resourceName,
+                                                  size_t maxQueueSize,
+                                                  size_t initialThreadCount,
+                                                  ContextType* context,
+                                                  Finalizer finalizeCallback,
+                                                  FinalizerDataType* data,
+                                                  napi_finalize wrapper) {
+  static_assert(details::can_make_string<ResourceString>::value
+      || std::is_convertible<ResourceString, napi_value>::value,
+      "Resource name should be convertible to the string type");
+
+  ThreadSafeFunction tsfn;
+  auto* finalizeData = new details::ThreadSafeFinalize<ContextType, Finalizer,
+      FinalizerDataType>({ data, finalizeCallback });
+  napi_status status = napi_create_threadsafe_function(env, callback, resource,
+      Value::From(env, resourceName), maxQueueSize, initialThreadCount,
+      finalizeData, wrapper, context, CallJS, &tsfn._tsfn);
+  if (status != napi_ok) {
+    delete finalizeData;
+    NAPI_THROW_IF_FAILED(env, status, ThreadSafeFunction());
+  }
+
+  return tsfn;
+}
+
+inline napi_status ThreadSafeFunction::CallInternal(
+    CallbackWrapper* callbackWrapper,
+    napi_threadsafe_function_call_mode mode) const {
+  napi_status status = napi_call_threadsafe_function(
+      _tsfn, callbackWrapper, mode);
+  if (status != napi_ok && callbackWrapper != nullptr) {
+    delete callbackWrapper;
+  }
+
+  return status;
+}
+
+// static
+inline void ThreadSafeFunction::CallJS(napi_env env,
+                                       napi_value jsCallback,
+                                       void* /* context */,
+                                       void* data) {
+  if (env == nullptr && jsCallback == nullptr) {
+    return;
+  }
+
+  if (data != nullptr) {
+    auto* callbackWrapper = static_cast<CallbackWrapper*>(data);
+    (*callbackWrapper)(env, Function(env, jsCallback));
+    delete callbackWrapper;
+  } else if (jsCallback != nullptr) {
+    Function(env, jsCallback).Call({});
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Async Progress Worker Base class
+////////////////////////////////////////////////////////////////////////////////
+template <typename DataType>
+inline AsyncProgressWorkerBase<DataType>::AsyncProgressWorkerBase(const Object& receiver,
+                                                                  const Function& callback,
+                                                                  const char* resource_name,
+                                                                  const Object& resource,
+                                                                  size_t queue_size)
+  : AsyncWorker(receiver, callback, resource_name, resource) {
+  // Fill all possible arguments to work around ambiguous ThreadSafeFunction::New signatures.
+  _tsfn = ThreadSafeFunction::New(callback.Env(),
+                                  callback,
+                                  resource,
+                                  resource_name,
+                                  queue_size,
+                                  /** initialThreadCount */ 1,
+                                  /** context */ this,
+                                  OnThreadSafeFunctionFinalize,
+                                  /** finalizeData */ this);
+}
+
+#if NAPI_VERSION > 4
+template <typename DataType>
+inline AsyncProgressWorkerBase<DataType>::AsyncProgressWorkerBase(Napi::Env env,
+                                                                  const char* resource_name,
+                                                                  const Object& resource,
+                                                                  size_t queue_size)
+  : AsyncWorker(env, resource_name, resource) {
+  // TODO: Once the changes to make the callback optional for threadsafe
+  // functions are available on all versions we can remove the dummy Function here.
+  Function callback;
+  // Fill all possible arguments to work around ambiguous ThreadSafeFunction::New signatures.
+  _tsfn = ThreadSafeFunction::New(env,
+                                  callback,
+                                  resource,
+                                  resource_name,
+                                  queue_size,
+                                  /** initialThreadCount */ 1,
+                                  /** context */ this,
+                                  OnThreadSafeFunctionFinalize,
+                                  /** finalizeData */ this);
+}
+#endif
+
+template<typename DataType>
+inline AsyncProgressWorkerBase<DataType>::~AsyncProgressWorkerBase() {
+  // Abort pending tsfn call.
+  // Don't send progress events after we've already completed.
+  // It's ok to call ThreadSafeFunction::Abort and ThreadSafeFunction::Release duplicated.
+  _tsfn.Abort();
+}
+
+template <typename DataType>
+inline void AsyncProgressWorkerBase<DataType>::OnAsyncWorkProgress(Napi::Env /* env */,
+                                Napi::Function /* jsCallback */,
+                                void* data) {
+  ThreadSafeData* tsd = static_cast<ThreadSafeData*>(data);
+  tsd->asyncprogressworker()->OnWorkProgress(tsd->data());
+  delete tsd;
+}
+
+template <typename DataType>
+inline napi_status AsyncProgressWorkerBase<DataType>::NonBlockingCall(DataType* data) {
+  auto tsd = new AsyncProgressWorkerBase::ThreadSafeData(this, data);
+  return _tsfn.NonBlockingCall(tsd, OnAsyncWorkProgress);
+}
+
+template <typename DataType>
+inline void AsyncProgressWorkerBase<DataType>::OnWorkComplete(Napi::Env /* env */, napi_status status) {
+  _work_completed = true;
+  _complete_status = status;
+  _tsfn.Release();
+}
+
+template <typename DataType>
+inline void AsyncProgressWorkerBase<DataType>::OnThreadSafeFunctionFinalize(Napi::Env env, void* /* data */, AsyncProgressWorkerBase* context) {
+  if (context->_work_completed) {
+    context->AsyncWorker::OnWorkComplete(env, context->_complete_status);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Async Progress Worker class
+////////////////////////////////////////////////////////////////////////////////
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(const Function& callback)
+  : AsyncProgressWorker(callback, "generic") {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(const Function& callback,
+                                const char* resource_name)
+  : AsyncProgressWorker(callback, resource_name, Object::New(callback.Env())) {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(const Function& callback,
+                                const char* resource_name,
+                                const Object& resource)
+  : AsyncProgressWorker(Object::New(callback.Env()),
+                callback,
+                resource_name,
+                resource) {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(const Object& receiver,
+                                                   const Function& callback)
+  : AsyncProgressWorker(receiver, callback, "generic") {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(const Object& receiver,
+                                                   const Function& callback,
+                                                   const char* resource_name)
+  : AsyncProgressWorker(receiver,
+                callback,
+                resource_name,
+                Object::New(callback.Env())) {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(const Object& receiver,
+                                                   const Function& callback,
+                                                   const char* resource_name,
+                                                   const Object& resource)
+  : AsyncProgressWorkerBase(receiver, callback, resource_name, resource),
+    _asyncdata(nullptr),
+    _asyncsize(0) {
+}
+
+#if NAPI_VERSION > 4
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(Napi::Env env)
+  : AsyncProgressWorker(env, "generic") {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(Napi::Env env,
+                                                   const char* resource_name)
+  : AsyncProgressWorker(env, resource_name, Object::New(env)) {
+}
+
+template<class T>
+inline AsyncProgressWorker<T>::AsyncProgressWorker(Napi::Env env,
+                                                   const char* resource_name,
+                                                   const Object& resource)
+  : AsyncProgressWorkerBase(env, resource_name, resource),
+    _asyncdata(nullptr),
+    _asyncsize(0) {
+}
+#endif
+
+template<class T>
+inline AsyncProgressWorker<T>::~AsyncProgressWorker() {
+  {
+    std::lock_guard<std::mutex> lock(this->_mutex);
+    _asyncdata = nullptr;
+    _asyncsize = 0;
+  }
+}
+
+template<class T>
+inline void AsyncProgressWorker<T>::Execute() {
+  ExecutionProgress progress(this);
+  Execute(progress);
+}
+
+template<class T>
+inline void AsyncProgressWorker<T>::OnWorkProgress(void*) {
+  T* data;
+  size_t size;
+  {
+    std::lock_guard<std::mutex> lock(this->_mutex);
+    data = this->_asyncdata;
+    size = this->_asyncsize;
+    this->_asyncdata = nullptr;
+    this->_asyncsize = 0;
+  }
+
+  /**
+   * The callback of ThreadSafeFunction is not been invoked immediately on the
+   * callback of uv_async_t (uv io poll), rather the callback of TSFN is
+   * invoked on the right next uv idle callback. There are chances that during
+   * the deferring the signal of uv_async_t is been sent again, i.e. potential
+   * not coalesced two calls of the TSFN callback.
+   */
+  if (data == nullptr) {
+    return;
+  }
+
+  this->OnProgress(data, size);
+  delete[] data;
+}
+
+template<class T>
+inline void AsyncProgressWorker<T>::SendProgress_(const T* data, size_t count) {
+    T* new_data = new T[count];
+    std::copy(data, data + count, new_data);
+
+    T* old_data;
+    {
+      std::lock_guard<std::mutex> lock(this->_mutex);
+      old_data = _asyncdata;
+      _asyncdata = new_data;
+      _asyncsize = count;
+    }
+    this->NonBlockingCall(nullptr);
+
+    delete[] old_data;
+}
+
+template<class T>
+inline void AsyncProgressWorker<T>::Signal() const {
+  this->NonBlockingCall(static_cast<T*>(nullptr));
+}
+
+template<class T>
+inline void AsyncProgressWorker<T>::ExecutionProgress::Signal() const {
+  _worker->Signal();
+}
+
+template<class T>
+inline void AsyncProgressWorker<T>::ExecutionProgress::Send(const T* data, size_t count) const {
+  _worker->SendProgress_(data, count);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Async Progress Queue Worker class
+////////////////////////////////////////////////////////////////////////////////
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(const Function& callback)
+  : AsyncProgressQueueWorker(callback, "generic") {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(const Function& callback,
+                                                             const char* resource_name)
+  : AsyncProgressQueueWorker(callback, resource_name, Object::New(callback.Env())) {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(const Function& callback,
+                                                             const char* resource_name,
+                                                             const Object& resource)
+  : AsyncProgressQueueWorker(Object::New(callback.Env()),
+                             callback,
+                             resource_name,
+                             resource) {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(const Object& receiver,
+                                                             const Function& callback)
+  : AsyncProgressQueueWorker(receiver, callback, "generic") {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(const Object& receiver,
+                                                             const Function& callback,
+                                                             const char* resource_name)
+  : AsyncProgressQueueWorker(receiver,
+                             callback,
+                             resource_name,
+                             Object::New(callback.Env())) {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(const Object& receiver,
+                                                             const Function& callback,
+                                                             const char* resource_name,
+                                                             const Object& resource)
+  : AsyncProgressWorkerBase<std::pair<T*, size_t>>(receiver, callback, resource_name, resource, /** unlimited queue size */0) {
+}
+
+#if NAPI_VERSION > 4
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(Napi::Env env)
+  : AsyncProgressQueueWorker(env, "generic") {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(Napi::Env env,
+                                const char* resource_name)
+  : AsyncProgressQueueWorker(env, resource_name, Object::New(env)) {
+}
+
+template<class T>
+inline AsyncProgressQueueWorker<T>::AsyncProgressQueueWorker(Napi::Env env,
+                                                             const char* resource_name,
+                                                             const Object& resource)
+  : AsyncProgressWorkerBase<std::pair<T*, size_t>>(env, resource_name, resource, /** unlimited queue size */0) {
+}
+#endif
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::Execute() {
+  ExecutionProgress progress(this);
+  Execute(progress);
+}
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::OnWorkProgress(std::pair<T*, size_t>* datapair) {
+  if (datapair == nullptr) {
+    return;
+  }
+
+  T *data = datapair->first;
+  size_t size = datapair->second;
+
+  this->OnProgress(data, size);
+  delete datapair;
+  delete[] data;
+}
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::SendProgress_(const T* data, size_t count) {
+    T* new_data = new T[count];
+    std::copy(data, data + count, new_data);
+
+    auto pair = new std::pair<T*, size_t>(new_data, count);
+    this->NonBlockingCall(pair);
+}
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::Signal() const {
+  this->NonBlockingCall(nullptr);
+}
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::OnWorkComplete(Napi::Env env, napi_status status) {
+  // Draining queued items in TSFN.
+  AsyncProgressWorkerBase<std::pair<T*, size_t>>::OnWorkComplete(env, status);
+}
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::ExecutionProgress::Signal() const {
+  _worker->Signal();
+}
+
+template<class T>
+inline void AsyncProgressQueueWorker<T>::ExecutionProgress::Send(const T* data, size_t count) const {
+  _worker->SendProgress_(data, count);
+}
+#endif  // NAPI_VERSION > 3 && !defined(__wasm32__)
+
+////////////////////////////////////////////////////////////////////////////////
+// Memory Management class
+////////////////////////////////////////////////////////////////////////////////
+
+inline int64_t MemoryManagement::AdjustExternalMemory(Env env, int64_t change_in_bytes) {
+  int64_t result;
+  napi_status status = napi_adjust_external_memory(env, change_in_bytes, &result);
+  NAPI_THROW_IF_FAILED(env, status, 0);
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Version Management class
+////////////////////////////////////////////////////////////////////////////////
+
+inline uint32_t VersionManagement::GetNapiVersion(Env env) {
+  uint32_t result;
+  napi_status status = napi_get_version(env, &result);
+  NAPI_THROW_IF_FAILED(env, status, 0);
+  return result;
+}
+
+inline const napi_node_version* VersionManagement::GetNodeVersion(Env env) {
+  const napi_node_version* result;
+  napi_status status = napi_get_node_version(env, &result);
+  NAPI_THROW_IF_FAILED(env, status, 0);
+  return result;
+}
+
+#if NAPI_VERSION > 5
+////////////////////////////////////////////////////////////////////////////////
+// Addon<T> class
+////////////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+inline Object Addon<T>::Init(Env env, Object exports) {
+  T* addon = new T(env, exports);
+  env.SetInstanceData(addon);
+  return addon->entry_point_;
+}
+
+template <typename T>
+inline T* Addon<T>::Unwrap(Object wrapper) {
+  return wrapper.Env().GetInstanceData<T>();
+}
+
+template <typename T>
+inline void
+Addon<T>::DefineAddon(Object exports,
+                      const std::initializer_list<AddonProp>& props) {
+  DefineProperties(exports, props);
+  entry_point_ = exports;
+}
+
+template <typename T>
+inline Napi::Object
+Addon<T>::DefineProperties(Object object,
+                           const std::initializer_list<AddonProp>& props) {
+  const napi_property_descriptor* properties =
+    reinterpret_cast<const napi_property_descriptor*>(props.begin());
+  size_t size = props.size();
+  napi_status status = napi_define_properties(object.Env(),
+                                              object,
+                                              size,
+                                              properties);
+  NAPI_THROW_IF_FAILED(object.Env(), status, object);
+  for (size_t idx = 0; idx < size; idx++)
+    T::AttachPropData(object.Env(), object, &properties[idx]);
+  return object;
+}
+#endif  // NAPI_VERSION > 5
+
+} // namespace Napi
+
+#endif // SRC_NAPI_INL_H_
