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Native Abstractions for Node.js: C++ header for Node 0.8 -> 18 compatibility
There is a newer version: 2.19.0
/*********************************************************************
 * NAN - Native Abstractions for Node.js
 *
 * Copyright (c) 2018 NAN contributors
 *
 * MIT License 
 ********************************************************************/

#ifndef NAN_MAYBE_PRE_43_INL_H_
#define NAN_MAYBE_PRE_43_INL_H_

template
class MaybeLocal {
 public:
  inline MaybeLocal() : val_(v8::Local()) {}

  template
# if NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION
  inline
  MaybeLocal(v8::Local that) : val_(that) {}  // NOLINT(runtime/explicit)
# else
  inline
  MaybeLocal(v8::Local that) :  // NOLINT(runtime/explicit)
      val_(*reinterpret_cast*>(&that)) {}
# endif

  inline bool IsEmpty() const { return val_.IsEmpty(); }

  template
  inline bool ToLocal(v8::Local *out) const {
    *out = val_;
    return !IsEmpty();
  }

  inline v8::Local ToLocalChecked() const {
#if defined(V8_ENABLE_CHECKS)
    assert(!IsEmpty() && "ToLocalChecked is Empty");
#endif  // V8_ENABLE_CHECKS
    return val_;
  }

  template
  inline v8::Local FromMaybe(v8::Local default_value) const {
    return IsEmpty() ? default_value : v8::Local(val_);
  }

 private:
  v8::Local val_;
};

inline
MaybeLocal ToDetailString(v8::Handle val) {
  return MaybeLocal(val->ToDetailString());
}

inline
MaybeLocal ToArrayIndex(v8::Handle val) {
  return MaybeLocal(val->ToArrayIndex());
}

inline
Maybe Equals(v8::Handle a, v8::Handle(b)) {
  return Just(a->Equals(b));
}

inline
MaybeLocal NewInstance(v8::Handle h) {
  return MaybeLocal(h->NewInstance());
}

inline
MaybeLocal NewInstance(
      v8::Local h
    , int argc
    , v8::Local argv[]) {
  return MaybeLocal(h->NewInstance(argc, argv));
}

inline
MaybeLocal NewInstance(v8::Handle h) {
  return MaybeLocal(h->NewInstance());
}

inline
MaybeLocal GetFunction(v8::Handle t) {
  return MaybeLocal(t->GetFunction());
}

inline Maybe Set(
    v8::Handle obj
  , v8::Handle key
  , v8::Handle value) {
  return Just(obj->Set(key, value));
}

inline Maybe Set(
    v8::Handle obj
  , uint32_t index
  , v8::Handle value) {
  return Just(obj->Set(index, value));
}

#include "nan_define_own_property_helper.h"  // NOLINT(build/include)

inline Maybe DefineOwnProperty(
    v8::Handle obj
  , v8::Handle key
  , v8::Handle value
  , v8::PropertyAttribute attribs = v8::None) {
  v8::PropertyAttribute current = obj->GetPropertyAttributes(key);
  return imp::DefineOwnPropertyHelper(current, obj, key, value, attribs);
}

NAN_DEPRECATED inline Maybe ForceSet(
    v8::Handle obj
  , v8::Handle key
  , v8::Handle value
  , v8::PropertyAttribute attribs = v8::None) {
  return Just(obj->ForceSet(key, value, attribs));
}

inline MaybeLocal Get(
    v8::Handle obj
  , v8::Handle key) {
  return MaybeLocal(obj->Get(key));
}

inline MaybeLocal Get(
    v8::Handle obj
  , uint32_t index) {
  return MaybeLocal(obj->Get(index));
}

inline Maybe GetPropertyAttributes(
    v8::Handle obj
  , v8::Handle key) {
  return Just(obj->GetPropertyAttributes(key));
}

inline Maybe Has(
    v8::Handle obj
  , v8::Handle key) {
  return Just(obj->Has(key));
}

inline Maybe Has(
    v8::Handle obj
  , uint32_t index) {
  return Just(obj->Has(index));
}

inline Maybe Delete(
    v8::Handle obj
  , v8::Handle key) {
  return Just(obj->Delete(key));
}

inline Maybe Delete(
    v8::Handle obj
  , uint32_t index) {
  return Just(obj->Delete(index));
}

inline
MaybeLocal GetPropertyNames(v8::Handle obj) {
  return MaybeLocal(obj->GetPropertyNames());
}

inline
MaybeLocal GetOwnPropertyNames(v8::Handle obj) {
  return MaybeLocal(obj->GetOwnPropertyNames());
}

inline Maybe SetPrototype(
    v8::Handle obj
  , v8::Handle prototype) {
  return Just(obj->SetPrototype(prototype));
}

inline MaybeLocal ObjectProtoToString(
    v8::Handle obj) {
  return MaybeLocal(obj->ObjectProtoToString());
}

inline Maybe HasOwnProperty(
    v8::Handle obj
  , v8::Handle key) {
  return Just(obj->HasOwnProperty(key));
}

inline Maybe HasRealNamedProperty(
    v8::Handle obj
  , v8::Handle key) {
  return Just(obj->HasRealNamedProperty(key));
}

inline Maybe HasRealIndexedProperty(
    v8::Handle obj
  , uint32_t index) {
  return Just(obj->HasRealIndexedProperty(index));
}

inline Maybe HasRealNamedCallbackProperty(
    v8::Handle obj
  , v8::Handle key) {
  return Just(obj->HasRealNamedCallbackProperty(key));
}

inline MaybeLocal GetRealNamedPropertyInPrototypeChain(
    v8::Handle obj
  , v8::Handle key) {
  return MaybeLocal(
      obj->GetRealNamedPropertyInPrototypeChain(key));
}

inline MaybeLocal GetRealNamedProperty(
    v8::Handle obj
  , v8::Handle key) {
  return MaybeLocal(obj->GetRealNamedProperty(key));
}

inline MaybeLocal CallAsFunction(
    v8::Handle obj
  , v8::Handle recv
  , int argc
  , v8::Handle argv[]) {
  return MaybeLocal(obj->CallAsFunction(recv, argc, argv));
}

inline MaybeLocal CallAsConstructor(
    v8::Handle obj
  , int argc
  , v8::Local argv[]) {
  return MaybeLocal(obj->CallAsConstructor(argc, argv));
}

inline
MaybeLocal GetSourceLine(v8::Handle msg) {
  return MaybeLocal(msg->GetSourceLine());
}

inline Maybe GetLineNumber(v8::Handle msg) {
  return Just(msg->GetLineNumber());
}

inline Maybe GetStartColumn(v8::Handle msg) {
  return Just(msg->GetStartColumn());
}

inline Maybe GetEndColumn(v8::Handle msg) {
  return Just(msg->GetEndColumn());
}

inline MaybeLocal CloneElementAt(
    v8::Handle array
  , uint32_t index) {
  return MaybeLocal(array->CloneElementAt(index));
}

inline MaybeLocal Call(
    v8::Local fun
  , v8::Local recv
  , int argc
  , v8::Local argv[]) {
  return MaybeLocal(fun->Call(recv, argc, argv));
}

#endif  // NAN_MAYBE_PRE_43_INL_H_