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diff --git a/node_modules/nan/nan.h b/node_modules/nan/nan.h
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+++ b/node_modules/nan/nan.h
@@ -0,0 +1,2904 @@
+/*********************************************************************
+ * NAN - Native Abstractions for Node.js
+ *
+ * Copyright (c) 2018 NAN contributors:
+ *   - Rod Vagg <https://github.com/rvagg>
+ *   - Benjamin Byholm <https://github.com/kkoopa>
+ *   - Trevor Norris <https://github.com/trevnorris>
+ *   - Nathan Rajlich <https://github.com/TooTallNate>
+ *   - Brett Lawson <https://github.com/brett19>
+ *   - Ben Noordhuis <https://github.com/bnoordhuis>
+ *   - David Siegel <https://github.com/agnat>
+ *   - Michael Ira Krufky <https://github.com/mkrufky>
+ *
+ * MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
+ *
+ * Version 2.15.0: current Node 16.6.1, Node 0.12: 0.12.18, Node 0.10: 0.10.48, iojs: 3.3.1
+ *
+ * See https://github.com/nodejs/nan for the latest update to this file
+ **********************************************************************************/
+
+#ifndef NAN_H_
+#define NAN_H_
+
+#include <node_version.h>
+
+#define NODE_0_10_MODULE_VERSION 11
+#define NODE_0_12_MODULE_VERSION 14
+#define ATOM_0_21_MODULE_VERSION 41
+#define IOJS_1_0_MODULE_VERSION  42
+#define IOJS_1_1_MODULE_VERSION  43
+#define IOJS_2_0_MODULE_VERSION  44
+#define IOJS_3_0_MODULE_VERSION  45
+#define NODE_4_0_MODULE_VERSION  46
+#define NODE_5_0_MODULE_VERSION  47
+#define NODE_6_0_MODULE_VERSION  48
+#define NODE_7_0_MODULE_VERSION  51
+#define NODE_8_0_MODULE_VERSION  57
+#define NODE_9_0_MODULE_VERSION  59
+#define NODE_10_0_MODULE_VERSION 64
+#define NODE_11_0_MODULE_VERSION 67
+#define NODE_12_0_MODULE_VERSION 72
+#define NODE_13_0_MODULE_VERSION 79
+#define NODE_14_0_MODULE_VERSION 83
+#define NODE_15_0_MODULE_VERSION 88
+#define NODE_16_0_MODULE_VERSION 93
+
+#ifdef _MSC_VER
+# define NAN_HAS_CPLUSPLUS_11 (_MSC_VER >= 1800)
+#else
+# define NAN_HAS_CPLUSPLUS_11 (__cplusplus >= 201103L)
+#endif
+
+#if NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION && !NAN_HAS_CPLUSPLUS_11
+# error This version of node/NAN/v8 requires a C++11 compiler
+#endif
+
+#include <uv.h>
+#include <node.h>
+#include <node_buffer.h>
+#include <node_object_wrap.h>
+#include <algorithm>
+#include <cstring>
+#include <climits>
+#include <cstdlib>
+#include <utility>
+#if defined(_MSC_VER)
+# pragma warning( push )
+# pragma warning( disable : 4530 )
+# include <queue>
+# include <string>
+# include <vector>
+# pragma warning( pop )
+#else
+# include <queue>
+# include <string>
+# include <vector>
+#endif
+
+// uv helpers
+#ifdef UV_VERSION_MAJOR
+# ifndef UV_VERSION_PATCH
+#  define UV_VERSION_PATCH 0
+# endif
+# define NAUV_UVVERSION ((UV_VERSION_MAJOR << 16) | \
+                         (UV_VERSION_MINOR <<  8) | \
+                         (UV_VERSION_PATCH))
+#else
+# define NAUV_UVVERSION 0x000b00
+#endif
+
+#if NAUV_UVVERSION < 0x000b0b
+# ifdef WIN32
+#  include <windows.h>
+# else
+#  include <pthread.h>
+# endif
+#endif
+
+namespace Nan {
+
+#define NAN_CONCAT(a, b) NAN_CONCAT_HELPER(a, b)
+#define NAN_CONCAT_HELPER(a, b) a##b
+
+#define NAN_INLINE inline  // TODO(bnoordhuis) Remove in v3.0.0.
+
+#if defined(__GNUC__) && \
+    !(defined(V8_DISABLE_DEPRECATIONS) && V8_DISABLE_DEPRECATIONS)
+# define NAN_DEPRECATED __attribute__((deprecated))
+#elif defined(_MSC_VER) && \
+    !(defined(V8_DISABLE_DEPRECATIONS) && V8_DISABLE_DEPRECATIONS)
+# define NAN_DEPRECATED __declspec(deprecated)
+#else
+# define NAN_DEPRECATED
+#endif
+
+#if NAN_HAS_CPLUSPLUS_11
+# define NAN_DISALLOW_ASSIGN(CLASS) void operator=(const CLASS&) = delete;
+# define NAN_DISALLOW_COPY(CLASS) CLASS(const CLASS&) = delete;
+# define NAN_DISALLOW_MOVE(CLASS)                                              \
+    CLASS(CLASS&&) = delete;  /* NOLINT(build/c++11) */                        \
+    void operator=(CLASS&&) = delete;
+#else
+# define NAN_DISALLOW_ASSIGN(CLASS) void operator=(const CLASS&);
+# define NAN_DISALLOW_COPY(CLASS) CLASS(const CLASS&);
+# define NAN_DISALLOW_MOVE(CLASS)
+#endif
+
+#define NAN_DISALLOW_ASSIGN_COPY(CLASS)                                        \
+    NAN_DISALLOW_ASSIGN(CLASS)                                                 \
+    NAN_DISALLOW_COPY(CLASS)
+
+#define NAN_DISALLOW_ASSIGN_MOVE(CLASS)                                        \
+    NAN_DISALLOW_ASSIGN(CLASS)                                                 \
+    NAN_DISALLOW_MOVE(CLASS)
+
+#define NAN_DISALLOW_COPY_MOVE(CLASS)                                          \
+    NAN_DISALLOW_COPY(CLASS)                                                   \
+    NAN_DISALLOW_MOVE(CLASS)
+
+#define NAN_DISALLOW_ASSIGN_COPY_MOVE(CLASS)                                   \
+    NAN_DISALLOW_ASSIGN(CLASS)                                                 \
+    NAN_DISALLOW_COPY(CLASS)                                                   \
+    NAN_DISALLOW_MOVE(CLASS)
+
+#define TYPE_CHECK(T, S)                                                       \
+    while (false) {                                                            \
+      *(static_cast<T *volatile *>(0)) = static_cast<S*>(0);                   \
+    }
+
+//=== RegistrationFunction =====================================================
+
+#if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+  typedef v8::Handle<v8::Object> ADDON_REGISTER_FUNCTION_ARGS_TYPE;
+#else
+  typedef v8::Local<v8::Object> ADDON_REGISTER_FUNCTION_ARGS_TYPE;
+#endif
+
+#define NAN_MODULE_INIT(name)                                                  \
+    void name(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target)
+
+#if NODE_MAJOR_VERSION >= 10 || \
+    NODE_MAJOR_VERSION == 9 && NODE_MINOR_VERSION >= 3
+#define NAN_MODULE_WORKER_ENABLED(module_name, registration)                   \
+    extern "C" NODE_MODULE_EXPORT void                                         \
+      NAN_CONCAT(node_register_module_v, NODE_MODULE_VERSION)(                 \
+        v8::Local<v8::Object> exports, v8::Local<v8::Value> module,            \
+        v8::Local<v8::Context> context)                                        \
+    {                                                                          \
+        registration(exports);                                                 \
+    }
+#else
+#define NAN_MODULE_WORKER_ENABLED(module_name, registration)                   \
+    NODE_MODULE(module_name, registration)
+#endif
+
+//=== CallbackInfo =============================================================
+
+#include "nan_callbacks.h"  // NOLINT(build/include)
+
+//==============================================================================
+
+#if (NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION)
+typedef v8::Script             UnboundScript;
+typedef v8::Script             BoundScript;
+#else
+typedef v8::UnboundScript      UnboundScript;
+typedef v8::Script             BoundScript;
+#endif
+
+#if (NODE_MODULE_VERSION < ATOM_0_21_MODULE_VERSION)
+typedef v8::String::ExternalAsciiStringResource
+    ExternalOneByteStringResource;
+#else
+typedef v8::String::ExternalOneByteStringResource
+    ExternalOneByteStringResource;
+#endif
+
+#if (NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION)
+template<typename T>
+class NonCopyablePersistentTraits :
+    public v8::NonCopyablePersistentTraits<T> {};
+template<typename T>
+class CopyablePersistentTraits :
+    public v8::CopyablePersistentTraits<T> {};
+
+template<typename T>
+class PersistentBase :
+    public v8::PersistentBase<T> {};
+
+template<typename T, typename M = v8::NonCopyablePersistentTraits<T> >
+class Persistent;
+#else
+template<typename T> class NonCopyablePersistentTraits;
+template<typename T> class PersistentBase;
+template<typename T, typename P> class WeakCallbackData;
+template<typename T, typename M = NonCopyablePersistentTraits<T> >
+class Persistent;
+#endif  // NODE_MODULE_VERSION
+
+template<typename T>
+class Maybe {
+ public:
+  inline bool IsNothing() const { return !has_value_; }
+  inline bool IsJust() const { return has_value_; }
+
+  inline T ToChecked() const { return FromJust(); }
+  inline void Check() const { FromJust(); }
+
+  inline bool To(T* out) const {
+    if (IsJust()) *out = value_;
+    return IsJust();
+  }
+
+  inline T FromJust() const {
+#if defined(V8_ENABLE_CHECKS)
+    assert(IsJust() && "FromJust is Nothing");
+#endif  // V8_ENABLE_CHECKS
+    return value_;
+  }
+
+  inline T FromMaybe(const T& default_value) const {
+    return has_value_ ? value_ : default_value;
+  }
+
+  inline bool operator==(const Maybe &other) const {
+    return (IsJust() == other.IsJust()) &&
+        (!IsJust() || FromJust() == other.FromJust());
+  }
+
+  inline bool operator!=(const Maybe &other) const {
+    return !operator==(other);
+  }
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+  // Allow implicit conversions from v8::Maybe<T> to Nan::Maybe<T>.
+  Maybe(const v8::Maybe<T>& that)  // NOLINT(runtime/explicit)
+    : has_value_(that.IsJust())
+    , value_(that.FromMaybe(T())) {}
+#endif
+
+ private:
+  Maybe() : has_value_(false) {}
+  explicit Maybe(const T& t) : has_value_(true), value_(t) {}
+  bool has_value_;
+  T value_;
+
+  template<typename U>
+  friend Maybe<U> Nothing();
+  template<typename U>
+  friend Maybe<U> Just(const U& u);
+};
+
+template<typename T>
+inline Maybe<T> Nothing() {
+  return Maybe<T>();
+}
+
+template<typename T>
+inline Maybe<T> Just(const T& t) {
+  return Maybe<T>(t);
+}
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+# include "nan_maybe_43_inl.h"  // NOLINT(build/include)
+#else
+# include "nan_maybe_pre_43_inl.h"  // NOLINT(build/include)
+#endif
+
+#include "nan_converters.h"  // NOLINT(build/include)
+#include "nan_new.h"  // NOLINT(build/include)
+
+#if NAUV_UVVERSION < 0x000b17
+#define NAUV_WORK_CB(func) \
+    void func(uv_async_t *async, int)
+#else
+#define NAUV_WORK_CB(func) \
+    void func(uv_async_t *async)
+#endif
+
+#if NAUV_UVVERSION >= 0x000b0b
+
+typedef uv_key_t nauv_key_t;
+
+inline int nauv_key_create(nauv_key_t *key) {
+  return uv_key_create(key);
+}
+
+inline void nauv_key_delete(nauv_key_t *key) {
+  uv_key_delete(key);
+}
+
+inline void* nauv_key_get(nauv_key_t *key) {
+  return uv_key_get(key);
+}
+
+inline void nauv_key_set(nauv_key_t *key, void *value) {
+  uv_key_set(key, value);
+}
+
+#else
+
+/* Implement thread local storage for older versions of libuv.
+ * This is essentially a backport of libuv commit 5d2434bf
+ * written by Ben Noordhuis, adjusted for names and inline.
+ */
+
+#ifndef WIN32
+
+typedef pthread_key_t nauv_key_t;
+
+inline int nauv_key_create(nauv_key_t* key) {
+  return -pthread_key_create(key, NULL);
+}
+
+inline void nauv_key_delete(nauv_key_t* key) {
+  if (pthread_key_delete(*key))
+    abort();
+}
+
+inline void* nauv_key_get(nauv_key_t* key) {
+  return pthread_getspecific(*key);
+}
+
+inline void nauv_key_set(nauv_key_t* key, void* value) {
+  if (pthread_setspecific(*key, value))
+    abort();
+}
+
+#else
+
+typedef struct {
+  DWORD tls_index;
+} nauv_key_t;
+
+inline int nauv_key_create(nauv_key_t* key) {
+  key->tls_index = TlsAlloc();
+  if (key->tls_index == TLS_OUT_OF_INDEXES)
+    return UV_ENOMEM;
+  return 0;
+}
+
+inline void nauv_key_delete(nauv_key_t* key) {
+  if (TlsFree(key->tls_index) == FALSE)
+    abort();
+  key->tls_index = TLS_OUT_OF_INDEXES;
+}
+
+inline void* nauv_key_get(nauv_key_t* key) {
+  void* value = TlsGetValue(key->tls_index);
+  if (value == NULL)
+    if (GetLastError() != ERROR_SUCCESS)
+      abort();
+  return value;
+}
+
+inline void nauv_key_set(nauv_key_t* key, void* value) {
+  if (TlsSetValue(key->tls_index, value) == FALSE)
+    abort();
+}
+
+#endif
+#endif
+
+#if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+template<typename T>
+v8::Local<T> New(v8::Handle<T>);
+#endif
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+  typedef v8::WeakCallbackType WeakCallbackType;
+#else
+struct WeakCallbackType {
+  enum E {kParameter, kInternalFields};
+  E type;
+  WeakCallbackType(E other) : type(other) {}  // NOLINT(runtime/explicit)
+  inline bool operator==(E other) { return other == this->type; }
+  inline bool operator!=(E other) { return !operator==(other); }
+};
+#endif
+
+template<typename P> class WeakCallbackInfo;
+
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+# include "nan_persistent_12_inl.h"  // NOLINT(build/include)
+#else
+# include "nan_persistent_pre_12_inl.h"  // NOLINT(build/include)
+#endif
+
+namespace imp {
+  static const size_t kMaxLength = 0x3fffffff;
+  // v8::String::REPLACE_INVALID_UTF8 was introduced
+  // in node.js v0.10.29 and v0.8.27.
+#if NODE_MAJOR_VERSION > 0 || \
+    NODE_MINOR_VERSION > 10 || \
+    NODE_MINOR_VERSION == 10 && NODE_PATCH_VERSION >= 29 || \
+    NODE_MINOR_VERSION == 8 && NODE_PATCH_VERSION >= 27
+  static const unsigned kReplaceInvalidUtf8 = v8::String::REPLACE_INVALID_UTF8;
+#else
+  static const unsigned kReplaceInvalidUtf8 = 0;
+#endif
+}  // end of namespace imp
+
+//=== HandleScope ==============================================================
+
+class HandleScope {
+  v8::HandleScope scope;
+
+ public:
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  inline HandleScope() : scope(v8::Isolate::GetCurrent()) {}
+  inline static int NumberOfHandles() {
+    return v8::HandleScope::NumberOfHandles(v8::Isolate::GetCurrent());
+  }
+#else
+  inline HandleScope() : scope() {}
+  inline static int NumberOfHandles() {
+    return v8::HandleScope::NumberOfHandles();
+  }
+#endif
+
+ private:
+  // Make it hard to create heap-allocated or illegal handle scopes by
+  // disallowing certain operations.
+  HandleScope(const HandleScope &);
+  void operator=(const HandleScope &);
+  void *operator new(size_t size);
+  void operator delete(void *, size_t) {
+    abort();
+  }
+};
+
+class EscapableHandleScope {
+ public:
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  inline EscapableHandleScope() : scope(v8::Isolate::GetCurrent()) {}
+
+  inline static int NumberOfHandles() {
+    return v8::EscapableHandleScope::NumberOfHandles(v8::Isolate::GetCurrent());
+  }
+
+  template<typename T>
+  inline v8::Local<T> Escape(v8::Local<T> value) {
+    return scope.Escape(value);
+  }
+
+ private:
+  v8::EscapableHandleScope scope;
+#else
+  inline EscapableHandleScope() : scope() {}
+
+  inline static int NumberOfHandles() {
+    return v8::HandleScope::NumberOfHandles();
+  }
+
+  template<typename T>
+  inline v8::Local<T> Escape(v8::Local<T> value) {
+    return scope.Close(value);
+  }
+
+ private:
+  v8::HandleScope scope;
+#endif
+
+ private:
+  // Make it hard to create heap-allocated or illegal handle scopes by
+  // disallowing certain operations.
+  EscapableHandleScope(const EscapableHandleScope &);
+  void operator=(const EscapableHandleScope &);
+  void *operator new(size_t size);
+  void operator delete(void *, size_t) {
+    abort();
+  }
+};
+
+//=== TryCatch =================================================================
+
+class TryCatch {
+  v8::TryCatch try_catch_;
+  friend void FatalException(const TryCatch&);
+
+ public:
+#if NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
+  TryCatch() : try_catch_(v8::Isolate::GetCurrent()) {}
+#endif
+
+  inline bool HasCaught() const { return try_catch_.HasCaught(); }
+
+  inline bool CanContinue() const { return try_catch_.CanContinue(); }
+
+  inline v8::Local<v8::Value> ReThrow() {
+#if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    return New(try_catch_.ReThrow());
+#else
+    return try_catch_.ReThrow();
+#endif
+  }
+
+  inline v8::Local<v8::Value> Exception() const {
+    return try_catch_.Exception();
+  }
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+  inline v8::MaybeLocal<v8::Value> StackTrace() const {
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+    return scope.Escape(try_catch_.StackTrace(isolate->GetCurrentContext())
+                            .FromMaybe(v8::Local<v8::Value>()));
+  }
+#else
+  inline MaybeLocal<v8::Value> StackTrace() const {
+    return try_catch_.StackTrace();
+  }
+#endif
+
+  inline v8::Local<v8::Message> Message() const {
+    return try_catch_.Message();
+  }
+
+  inline void Reset() { try_catch_.Reset(); }
+
+  inline void SetVerbose(bool value) { try_catch_.SetVerbose(value); }
+
+  inline void SetCaptureMessage(bool value) {
+    try_catch_.SetCaptureMessage(value);
+  }
+};
+
+v8::Local<v8::Value> MakeCallback(v8::Local<v8::Object> target,
+                                  v8::Local<v8::Function> func,
+                                  int argc,
+                                  v8::Local<v8::Value>* argv);
+v8::Local<v8::Value> MakeCallback(v8::Local<v8::Object> target,
+                                  v8::Local<v8::String> symbol,
+                                  int argc,
+                                  v8::Local<v8::Value>* argv);
+v8::Local<v8::Value> MakeCallback(v8::Local<v8::Object> target,
+                                  const char* method,
+                                  int argc,
+                                  v8::Local<v8::Value>* argv);
+
+// === AsyncResource ===========================================================
+
+class AsyncResource {
+ public:
+  AsyncResource(
+      v8::Local<v8::String> name
+    , v8::Local<v8::Object> resource = New<v8::Object>()) {
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+
+    if (resource.IsEmpty()) {
+      resource = New<v8::Object>();
+    }
+
+    context = node::EmitAsyncInit(isolate, resource, name);
+#endif
+  }
+
+  AsyncResource(
+      const char* name
+    , v8::Local<v8::Object> resource = New<v8::Object>()) {
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+
+    if (resource.IsEmpty()) {
+      resource = New<v8::Object>();
+    }
+
+    v8::Local<v8::String> name_string =
+        New<v8::String>(name).ToLocalChecked();
+    context = node::EmitAsyncInit(isolate, resource, name_string);
+#endif
+  }
+
+  ~AsyncResource() {
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    node::EmitAsyncDestroy(isolate, context);
+#endif
+  }
+
+  inline MaybeLocal<v8::Value> runInAsyncScope(
+      v8::Local<v8::Object> target
+    , v8::Local<v8::Function> func
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+#if NODE_MODULE_VERSION < NODE_9_0_MODULE_VERSION
+    return MakeCallback(target, func, argc, argv);
+#else
+    return node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, func, argc, argv, context);
+#endif
+  }
+
+  inline MaybeLocal<v8::Value> runInAsyncScope(
+      v8::Local<v8::Object> target
+    , v8::Local<v8::String> symbol
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+#if NODE_MODULE_VERSION < NODE_9_0_MODULE_VERSION
+    return MakeCallback(target, symbol, argc, argv);
+#else
+    return node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, symbol, argc, argv, context);
+#endif
+  }
+
+  inline MaybeLocal<v8::Value> runInAsyncScope(
+      v8::Local<v8::Object> target
+    , const char* method
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+#if NODE_MODULE_VERSION < NODE_9_0_MODULE_VERSION
+    return MakeCallback(target, method, argc, argv);
+#else
+    return node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, method, argc, argv, context);
+#endif
+  }
+
+ private:
+  NAN_DISALLOW_ASSIGN_COPY_MOVE(AsyncResource)
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+  node::async_context context;
+#endif
+};
+
+inline uv_loop_t* GetCurrentEventLoop() {
+#if NODE_MAJOR_VERSION >= 10 || \
+  NODE_MAJOR_VERSION == 9 && NODE_MINOR_VERSION >= 3 || \
+  NODE_MAJOR_VERSION == 8 && NODE_MINOR_VERSION >= 10
+    return node::GetCurrentEventLoop(v8::Isolate::GetCurrent());
+#else
+    return uv_default_loop();
+#endif
+}
+
+//============ =================================================================
+
+/* node 0.12  */
+#if NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION
+  inline
+  void SetCounterFunction(v8::CounterLookupCallback cb) {
+    v8::Isolate::GetCurrent()->SetCounterFunction(cb);
+  }
+
+  inline
+  void SetCreateHistogramFunction(v8::CreateHistogramCallback cb) {
+    v8::Isolate::GetCurrent()->SetCreateHistogramFunction(cb);
+  }
+
+  inline
+  void SetAddHistogramSampleFunction(v8::AddHistogramSampleCallback cb) {
+    v8::Isolate::GetCurrent()->SetAddHistogramSampleFunction(cb);
+  }
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+  inline bool IdleNotification(int idle_time_in_ms) {
+    return v8::Isolate::GetCurrent()->IdleNotificationDeadline(
+        idle_time_in_ms * 0.001);
+  }
+# else
+  inline bool IdleNotification(int idle_time_in_ms) {
+    return v8::Isolate::GetCurrent()->IdleNotification(idle_time_in_ms);
+  }
+#endif
+
+  inline void LowMemoryNotification() {
+    v8::Isolate::GetCurrent()->LowMemoryNotification();
+  }
+
+  inline void ContextDisposedNotification() {
+    v8::Isolate::GetCurrent()->ContextDisposedNotification();
+  }
+#else
+  inline
+  void SetCounterFunction(v8::CounterLookupCallback cb) {
+    v8::V8::SetCounterFunction(cb);
+  }
+
+  inline
+  void SetCreateHistogramFunction(v8::CreateHistogramCallback cb) {
+    v8::V8::SetCreateHistogramFunction(cb);
+  }
+
+  inline
+  void SetAddHistogramSampleFunction(v8::AddHistogramSampleCallback cb) {
+    v8::V8::SetAddHistogramSampleFunction(cb);
+  }
+
+  inline bool IdleNotification(int idle_time_in_ms) {
+    return v8::V8::IdleNotification(idle_time_in_ms);
+  }
+
+  inline void LowMemoryNotification() {
+    v8::V8::LowMemoryNotification();
+  }
+
+  inline void ContextDisposedNotification() {
+    v8::V8::ContextDisposedNotification();
+  }
+#endif
+
+#if (NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION)  // Node 0.12
+  inline v8::Local<v8::Primitive> Undefined() {
+# if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::Undefined(v8::Isolate::GetCurrent())));
+# else
+    return v8::Undefined(v8::Isolate::GetCurrent());
+# endif
+  }
+
+  inline v8::Local<v8::Primitive> Null() {
+# if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::Null(v8::Isolate::GetCurrent())));
+# else
+    return v8::Null(v8::Isolate::GetCurrent());
+# endif
+  }
+
+  inline v8::Local<v8::Boolean> True() {
+# if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::True(v8::Isolate::GetCurrent())));
+# else
+    return v8::True(v8::Isolate::GetCurrent());
+# endif
+  }
+
+  inline v8::Local<v8::Boolean> False() {
+# if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::False(v8::Isolate::GetCurrent())));
+# else
+    return v8::False(v8::Isolate::GetCurrent());
+# endif
+  }
+
+  inline v8::Local<v8::String> EmptyString() {
+    return v8::String::Empty(v8::Isolate::GetCurrent());
+  }
+
+  inline int AdjustExternalMemory(int bc) {
+    return static_cast<int>(
+        v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(bc));
+  }
+
+  inline void SetTemplate(
+      v8::Local<v8::Template> templ
+    , const char *name
+    , v8::Local<v8::Data> value) {
+    templ->Set(v8::Isolate::GetCurrent(), name, value);
+  }
+
+  inline void SetTemplate(
+      v8::Local<v8::Template> templ
+    , v8::Local<v8::String> name
+    , v8::Local<v8::Data> value
+    , v8::PropertyAttribute attributes) {
+    templ->Set(name, value, attributes);
+  }
+
+  inline v8::Local<v8::Context> GetCurrentContext() {
+    return v8::Isolate::GetCurrent()->GetCurrentContext();
+  }
+
+  inline void* GetInternalFieldPointer(
+      v8::Local<v8::Object> object
+    , int index) {
+    return object->GetAlignedPointerFromInternalField(index);
+  }
+
+  inline void SetInternalFieldPointer(
+      v8::Local<v8::Object> object
+    , int index
+    , void* value) {
+    object->SetAlignedPointerInInternalField(index, value);
+  }
+
+# define NAN_GC_CALLBACK(name)                                                 \
+    void name(v8::Isolate *isolate, v8::GCType type, v8::GCCallbackFlags flags)
+
+#if NODE_MODULE_VERSION <= NODE_4_0_MODULE_VERSION
+  typedef v8::Isolate::GCEpilogueCallback GCEpilogueCallback;
+  typedef v8::Isolate::GCPrologueCallback GCPrologueCallback;
+#else
+  typedef v8::Isolate::GCCallback GCEpilogueCallback;
+  typedef v8::Isolate::GCCallback GCPrologueCallback;
+#endif
+
+  inline void AddGCEpilogueCallback(
+      GCEpilogueCallback callback
+    , v8::GCType gc_type_filter = v8::kGCTypeAll) {
+    v8::Isolate::GetCurrent()->AddGCEpilogueCallback(callback, gc_type_filter);
+  }
+
+  inline void RemoveGCEpilogueCallback(
+      GCEpilogueCallback callback) {
+    v8::Isolate::GetCurrent()->RemoveGCEpilogueCallback(callback);
+  }
+
+  inline void AddGCPrologueCallback(
+      GCPrologueCallback callback
+    , v8::GCType gc_type_filter = v8::kGCTypeAll) {
+    v8::Isolate::GetCurrent()->AddGCPrologueCallback(callback, gc_type_filter);
+  }
+
+  inline void RemoveGCPrologueCallback(
+      GCPrologueCallback callback) {
+    v8::Isolate::GetCurrent()->RemoveGCPrologueCallback(callback);
+  }
+
+  inline void GetHeapStatistics(
+      v8::HeapStatistics *heap_statistics) {
+    v8::Isolate::GetCurrent()->GetHeapStatistics(heap_statistics);
+  }
+
+# define X(NAME)                                                               \
+    inline v8::Local<v8::Value> NAME(const char *msg) {                        \
+      EscapableHandleScope scope;                                              \
+      return scope.Escape(v8::Exception::NAME(New(msg).ToLocalChecked()));     \
+    }                                                                          \
+                                                                               \
+    inline                                                                     \
+    v8::Local<v8::Value> NAME(v8::Local<v8::String> msg) {                     \
+      return v8::Exception::NAME(msg);                                         \
+    }                                                                          \
+                                                                               \
+    inline void Throw ## NAME(const char *msg) {                               \
+      HandleScope scope;                                                       \
+      v8::Isolate::GetCurrent()->ThrowException(                               \
+          v8::Exception::NAME(New(msg).ToLocalChecked()));                     \
+    }                                                                          \
+                                                                               \
+    inline void Throw ## NAME(v8::Local<v8::String> msg) {                     \
+      HandleScope scope;                                                       \
+      v8::Isolate::GetCurrent()->ThrowException(                               \
+          v8::Exception::NAME(msg));                                           \
+    }
+
+  X(Error)
+  X(RangeError)
+  X(ReferenceError)
+  X(SyntaxError)
+  X(TypeError)
+
+# undef X
+
+  inline void ThrowError(v8::Local<v8::Value> error) {
+    v8::Isolate::GetCurrent()->ThrowException(error);
+  }
+
+  inline MaybeLocal<v8::Object> NewBuffer(
+      char *data
+    , size_t length
+#if NODE_MODULE_VERSION > IOJS_2_0_MODULE_VERSION
+    , node::Buffer::FreeCallback callback
+#else
+    , node::smalloc::FreeCallback callback
+#endif
+    , void *hint
+  ) {
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(length <= imp::kMaxLength && "too large buffer");
+#if NODE_MODULE_VERSION > IOJS_2_0_MODULE_VERSION
+    return node::Buffer::New(
+        v8::Isolate::GetCurrent(), data, length, callback, hint);
+#else
+    return node::Buffer::New(v8::Isolate::GetCurrent(), data, length, callback,
+                             hint);
+#endif
+  }
+
+  inline MaybeLocal<v8::Object> CopyBuffer(
+      const char *data
+    , uint32_t size
+  ) {
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(size <= imp::kMaxLength && "too large buffer");
+#if NODE_MODULE_VERSION > IOJS_2_0_MODULE_VERSION
+    return node::Buffer::Copy(
+        v8::Isolate::GetCurrent(), data, size);
+#else
+    return node::Buffer::New(v8::Isolate::GetCurrent(), data, size);
+#endif
+  }
+
+  inline MaybeLocal<v8::Object> NewBuffer(uint32_t size) {
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(size <= imp::kMaxLength && "too large buffer");
+#if NODE_MODULE_VERSION > IOJS_2_0_MODULE_VERSION
+    return node::Buffer::New(
+        v8::Isolate::GetCurrent(), size);
+#else
+    return node::Buffer::New(v8::Isolate::GetCurrent(), size);
+#endif
+  }
+
+  inline MaybeLocal<v8::Object> NewBuffer(
+      char* data
+    , uint32_t size
+  ) {
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(size <= imp::kMaxLength && "too large buffer");
+#if NODE_MODULE_VERSION > IOJS_2_0_MODULE_VERSION
+    return node::Buffer::New(v8::Isolate::GetCurrent(), data, size);
+#else
+    return node::Buffer::Use(v8::Isolate::GetCurrent(), data, size);
+#endif
+  }
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+  inline MaybeLocal<v8::String>
+  NewOneByteString(const uint8_t * value, int length = -1) {
+    return v8::String::NewFromOneByte(v8::Isolate::GetCurrent(), value,
+          v8::NewStringType::kNormal, length);
+  }
+
+  inline MaybeLocal<BoundScript> CompileScript(
+      v8::Local<v8::String> s
+    , const v8::ScriptOrigin& origin
+  ) {
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+    v8::ScriptCompiler::Source source(s, origin);
+    return scope.Escape(
+        v8::ScriptCompiler::Compile(isolate->GetCurrentContext(), &source)
+            .FromMaybe(v8::Local<BoundScript>()));
+  }
+
+  inline MaybeLocal<BoundScript> CompileScript(
+      v8::Local<v8::String> s
+  ) {
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+    v8::ScriptCompiler::Source source(s);
+    return scope.Escape(
+        v8::ScriptCompiler::Compile(isolate->GetCurrentContext(), &source)
+            .FromMaybe(v8::Local<BoundScript>()));
+  }
+
+  inline MaybeLocal<v8::Value> RunScript(
+      v8::Local<UnboundScript> script
+  ) {
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+    return scope.Escape(script->BindToCurrentContext()
+                            ->Run(isolate->GetCurrentContext())
+                            .FromMaybe(v8::Local<v8::Value>()));
+  }
+
+  inline MaybeLocal<v8::Value> RunScript(
+      v8::Local<BoundScript> script
+  ) {
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+    return scope.Escape(script->Run(isolate->GetCurrentContext())
+                            .FromMaybe(v8::Local<v8::Value>()));
+  }
+#else
+  inline MaybeLocal<v8::String>
+  NewOneByteString(const uint8_t * value, int length = -1) {
+    return v8::String::NewFromOneByte(v8::Isolate::GetCurrent(), value,
+                                      v8::String::kNormalString, length);
+  }
+
+  inline MaybeLocal<BoundScript> CompileScript(
+      v8::Local<v8::String> s
+    , const v8::ScriptOrigin& origin
+  ) {
+    v8::ScriptCompiler::Source source(s, origin);
+    return v8::ScriptCompiler::Compile(v8::Isolate::GetCurrent(), &source);
+  }
+
+  inline MaybeLocal<BoundScript> CompileScript(
+      v8::Local<v8::String> s
+  ) {
+    v8::ScriptCompiler::Source source(s);
+    return v8::ScriptCompiler::Compile(v8::Isolate::GetCurrent(), &source);
+  }
+
+  inline MaybeLocal<v8::Value> RunScript(
+      v8::Local<UnboundScript> script
+  ) {
+    EscapableHandleScope scope;
+    return scope.Escape(script->BindToCurrentContext()->Run());
+  }
+
+  inline MaybeLocal<v8::Value> RunScript(
+      v8::Local<BoundScript> script
+  ) {
+    return script->Run();
+  }
+#endif
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> MakeCallback(
+      v8::Local<v8::Object> target
+    , v8::Local<v8::Function> func
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+#if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, func, argc, argv)));
+#else
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource res("nan:makeCallback");
+    return res.runInAsyncScope(target, func, argc, argv)
+        .FromMaybe(v8::Local<v8::Value>());
+# else
+    return node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, func, argc, argv);
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#endif  // NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+  }
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> MakeCallback(
+      v8::Local<v8::Object> target
+    , v8::Local<v8::String> symbol
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+#if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, symbol, argc, argv)));
+#else
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource res("nan:makeCallback");
+    return res.runInAsyncScope(target, symbol, argc, argv)
+        .FromMaybe(v8::Local<v8::Value>());
+# else
+    return node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, symbol, argc, argv);
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#endif  // NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+  }
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> MakeCallback(
+      v8::Local<v8::Object> target
+    , const char* method
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+#if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    return scope.Escape(New(node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, method, argc, argv)));
+#else
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource res("nan:makeCallback");
+    return res.runInAsyncScope(target, method, argc, argv)
+        .FromMaybe(v8::Local<v8::Value>());
+# else
+    return node::MakeCallback(
+        v8::Isolate::GetCurrent(), target, method, argc, argv);
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#endif  // NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+  }
+
+  inline void FatalException(const TryCatch& try_catch) {
+    node::FatalException(v8::Isolate::GetCurrent(), try_catch.try_catch_);
+  }
+
+  inline v8::Local<v8::Value> ErrnoException(
+          int errorno
+       ,  const char* syscall = NULL
+       ,  const char* message = NULL
+       ,  const char* path = NULL) {
+    return node::ErrnoException(v8::Isolate::GetCurrent(), errorno, syscall,
+            message, path);
+  }
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> NanErrnoException(
+          int errorno
+       ,  const char* syscall = NULL
+       ,  const char* message = NULL
+       ,  const char* path = NULL) {
+    return ErrnoException(errorno, syscall, message, path);
+  }
+
+  template<typename T>
+  inline void SetIsolateData(
+      v8::Isolate *isolate
+    , T *data
+  ) {
+      isolate->SetData(0, data);
+  }
+
+  template<typename T>
+  inline T *GetIsolateData(
+      v8::Isolate *isolate
+  ) {
+      return static_cast<T*>(isolate->GetData(0));
+  }
+
+class Utf8String {
+ public:
+  inline explicit Utf8String(v8::Local<v8::Value> from) :
+      length_(0), str_(str_st_) {
+    HandleScope scope;
+    if (!from.IsEmpty()) {
+#if NODE_MAJOR_VERSION >= 10
+      v8::Local<v8::Context> context = GetCurrentContext();
+      v8::Local<v8::String> string =
+          from->ToString(context).FromMaybe(v8::Local<v8::String>());
+#else
+      v8::Local<v8::String> string = from->ToString();
+#endif
+      if (!string.IsEmpty()) {
+        size_t len = 3 * string->Length() + 1;
+        assert(len <= INT_MAX);
+        if (len > sizeof (str_st_)) {
+          str_ = static_cast<char*>(malloc(len));
+          assert(str_ != 0);
+        }
+        const int flags =
+            v8::String::NO_NULL_TERMINATION | imp::kReplaceInvalidUtf8;
+#if NODE_MAJOR_VERSION >= 11
+        length_ = string->WriteUtf8(v8::Isolate::GetCurrent(), str_,
+                                    static_cast<int>(len), 0, flags);
+#else
+        // See https://github.com/nodejs/nan/issues/832.
+        // Disable the warning as there is no way around it.
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4996)
+#endif
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+        length_ = string->WriteUtf8(str_, static_cast<int>(len), 0, flags);
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+#endif  // NODE_MAJOR_VERSION < 11
+        str_[length_] = '\0';
+      }
+    }
+  }
+
+  inline int length() const {
+    return length_;
+  }
+
+  inline char* operator*() { return str_; }
+  inline const char* operator*() const { return str_; }
+
+  inline ~Utf8String() {
+    if (str_ != str_st_) {
+      free(str_);
+    }
+  }
+
+ private:
+  NAN_DISALLOW_ASSIGN_COPY_MOVE(Utf8String)
+
+  int length_;
+  char *str_;
+  char str_st_[1024];
+};
+
+#else  // Node 0.8 and 0.10
+  inline v8::Local<v8::Primitive> Undefined() {
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::Undefined()));
+  }
+
+  inline v8::Local<v8::Primitive> Null() {
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::Null()));
+  }
+
+  inline v8::Local<v8::Boolean> True() {
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::True()));
+  }
+
+  inline v8::Local<v8::Boolean> False() {
+    EscapableHandleScope scope;
+    return scope.Escape(New(v8::False()));
+  }
+
+  inline v8::Local<v8::String> EmptyString() {
+    return v8::String::Empty();
+  }
+
+  inline int AdjustExternalMemory(int bc) {
+    return static_cast<int>(v8::V8::AdjustAmountOfExternalAllocatedMemory(bc));
+  }
+
+  inline void SetTemplate(
+      v8::Local<v8::Template> templ
+    , const char *name
+    , v8::Local<v8::Data> value) {
+    templ->Set(name, value);
+  }
+
+  inline void SetTemplate(
+      v8::Local<v8::Template> templ
+    , v8::Local<v8::String> name
+    , v8::Local<v8::Data> value
+    , v8::PropertyAttribute attributes) {
+    templ->Set(name, value, attributes);
+  }
+
+  inline v8::Local<v8::Context> GetCurrentContext() {
+    return v8::Context::GetCurrent();
+  }
+
+  inline void* GetInternalFieldPointer(
+      v8::Local<v8::Object> object
+    , int index) {
+    return object->GetPointerFromInternalField(index);
+  }
+
+  inline void SetInternalFieldPointer(
+      v8::Local<v8::Object> object
+    , int index
+    , void* value) {
+    object->SetPointerInInternalField(index, value);
+  }
+
+# define NAN_GC_CALLBACK(name)                                                 \
+    void name(v8::GCType type, v8::GCCallbackFlags flags)
+
+  inline void AddGCEpilogueCallback(
+    v8::GCEpilogueCallback callback
+  , v8::GCType gc_type_filter = v8::kGCTypeAll) {
+    v8::V8::AddGCEpilogueCallback(callback, gc_type_filter);
+  }
+  inline void RemoveGCEpilogueCallback(
+    v8::GCEpilogueCallback callback) {
+    v8::V8::RemoveGCEpilogueCallback(callback);
+  }
+  inline void AddGCPrologueCallback(
+    v8::GCPrologueCallback callback
+  , v8::GCType gc_type_filter = v8::kGCTypeAll) {
+    v8::V8::AddGCPrologueCallback(callback, gc_type_filter);
+  }
+  inline void RemoveGCPrologueCallback(
+    v8::GCPrologueCallback callback) {
+    v8::V8::RemoveGCPrologueCallback(callback);
+  }
+  inline void GetHeapStatistics(
+    v8::HeapStatistics *heap_statistics) {
+    v8::V8::GetHeapStatistics(heap_statistics);
+  }
+
+# define X(NAME)                                                               \
+    inline v8::Local<v8::Value> NAME(const char *msg) {                        \
+      EscapableHandleScope scope;                                              \
+      return scope.Escape(v8::Exception::NAME(New(msg).ToLocalChecked()));     \
+    }                                                                          \
+                                                                               \
+    inline                                                                     \
+    v8::Local<v8::Value> NAME(v8::Local<v8::String> msg) {                     \
+      return v8::Exception::NAME(msg);                                         \
+    }                                                                          \
+                                                                               \
+    inline void Throw ## NAME(const char *msg) {                               \
+      HandleScope scope;                                                       \
+      v8::ThrowException(v8::Exception::NAME(New(msg).ToLocalChecked()));      \
+    }                                                                          \
+                                                                               \
+    inline                                                                     \
+    void Throw ## NAME(v8::Local<v8::String> errmsg) {                         \
+      HandleScope scope;                                                       \
+      v8::ThrowException(v8::Exception::NAME(errmsg));                         \
+    }
+
+  X(Error)
+  X(RangeError)
+  X(ReferenceError)
+  X(SyntaxError)
+  X(TypeError)
+
+# undef X
+
+  inline void ThrowError(v8::Local<v8::Value> error) {
+    v8::ThrowException(error);
+  }
+
+  inline MaybeLocal<v8::Object> NewBuffer(
+      char *data
+    , size_t length
+    , node::Buffer::free_callback callback
+    , void *hint
+  ) {
+    EscapableHandleScope scope;
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(length <= imp::kMaxLength && "too large buffer");
+    return scope.Escape(
+        New(node::Buffer::New(data, length, callback, hint)->handle_));
+  }
+
+  inline MaybeLocal<v8::Object> CopyBuffer(
+      const char *data
+    , uint32_t size
+  ) {
+    EscapableHandleScope scope;
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(size <= imp::kMaxLength && "too large buffer");
+#if NODE_MODULE_VERSION >= NODE_0_10_MODULE_VERSION
+    return scope.Escape(New(node::Buffer::New(data, size)->handle_));
+#else
+    return scope.Escape(
+        New(node::Buffer::New(const_cast<char *>(data), size)->handle_));
+#endif
+  }
+
+  inline MaybeLocal<v8::Object> NewBuffer(uint32_t size) {
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    EscapableHandleScope scope;
+    assert(size <= imp::kMaxLength && "too large buffer");
+    return scope.Escape(New(node::Buffer::New(size)->handle_));
+  }
+
+  inline void FreeData(char *data, void *hint) {
+    (void) hint;  // unused
+    delete[] data;
+  }
+
+  inline MaybeLocal<v8::Object> NewBuffer(
+      char* data
+    , uint32_t size
+  ) {
+    EscapableHandleScope scope;
+    // arbitrary buffer lengths requires
+    // NODE_MODULE_VERSION >= IOJS_3_0_MODULE_VERSION
+    assert(size <= imp::kMaxLength && "too large buffer");
+    return scope.Escape(
+        New(node::Buffer::New(data, size, FreeData, NULL)->handle_));
+  }
+
+namespace imp {
+inline void
+widenString(std::vector<uint16_t> *ws, const uint8_t *s, int l) {
+  size_t len = static_cast<size_t>(l);
+  if (l < 0) {
+    len = strlen(reinterpret_cast<const char*>(s));
+  }
+  assert(len <= INT_MAX && "string too long");
+  ws->resize(len);
+  std::copy(s, s + len, ws->begin());  // NOLINT(build/include_what_you_use)
+}
+}  // end of namespace imp
+
+  inline MaybeLocal<v8::String>
+  NewOneByteString(const uint8_t * value, int length = -1) {
+    std::vector<uint16_t> wideString;  // NOLINT(build/include_what_you_use)
+    imp::widenString(&wideString, value, length);
+    return v8::String::New(wideString.data(),
+                           static_cast<int>(wideString.size()));
+  }
+
+  inline MaybeLocal<BoundScript> CompileScript(
+      v8::Local<v8::String> s
+    , const v8::ScriptOrigin& origin
+  ) {
+    return v8::Script::Compile(s, const_cast<v8::ScriptOrigin *>(&origin));
+  }
+
+  inline MaybeLocal<BoundScript> CompileScript(
+    v8::Local<v8::String> s
+  ) {
+    return v8::Script::Compile(s);
+  }
+
+  inline
+  MaybeLocal<v8::Value> RunScript(v8::Local<v8::Script> script) {
+    return script->Run();
+  }
+
+  inline v8::Local<v8::Value> MakeCallback(
+      v8::Local<v8::Object> target
+    , v8::Local<v8::Function> func
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+    v8::HandleScope scope;
+    return scope.Close(New(node::MakeCallback(target, func, argc, argv)));
+  }
+
+  inline v8::Local<v8::Value> MakeCallback(
+      v8::Local<v8::Object> target
+    , v8::Local<v8::String> symbol
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+    v8::HandleScope scope;
+    return scope.Close(New(node::MakeCallback(target, symbol, argc, argv)));
+  }
+
+  inline v8::Local<v8::Value> MakeCallback(
+      v8::Local<v8::Object> target
+    , const char* method
+    , int argc
+    , v8::Local<v8::Value>* argv) {
+    v8::HandleScope scope;
+    return scope.Close(New(node::MakeCallback(target, method, argc, argv)));
+  }
+
+  inline void FatalException(const TryCatch& try_catch) {
+    node::FatalException(const_cast<v8::TryCatch &>(try_catch.try_catch_));
+  }
+
+  inline v8::Local<v8::Value> ErrnoException(
+          int errorno
+       ,  const char* syscall = NULL
+       ,  const char* message = NULL
+       ,  const char* path = NULL) {
+    return node::ErrnoException(errorno, syscall, message, path);
+  }
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> NanErrnoException(
+          int errorno
+       ,  const char* syscall = NULL
+       ,  const char* message = NULL
+       ,  const char* path = NULL) {
+    return ErrnoException(errorno, syscall, message, path);
+  }
+
+
+  template<typename T>
+  inline void SetIsolateData(
+      v8::Isolate *isolate
+    , T *data
+  ) {
+      isolate->SetData(data);
+  }
+
+  template<typename T>
+  inline T *GetIsolateData(
+      v8::Isolate *isolate
+  ) {
+      return static_cast<T*>(isolate->GetData());
+  }
+
+class Utf8String {
+ public:
+  inline explicit Utf8String(v8::Local<v8::Value> from) :
+      length_(0), str_(str_st_) {
+    v8::HandleScope scope;
+    if (!from.IsEmpty()) {
+      v8::Local<v8::String> string = from->ToString();
+      if (!string.IsEmpty()) {
+        size_t len = 3 * string->Length() + 1;
+        assert(len <= INT_MAX);
+        if (len > sizeof (str_st_)) {
+          str_ = static_cast<char*>(malloc(len));
+          assert(str_ != 0);
+        }
+        const int flags =
+            v8::String::NO_NULL_TERMINATION | imp::kReplaceInvalidUtf8;
+        length_ = string->WriteUtf8(str_, static_cast<int>(len), 0, flags);
+        str_[length_] = '\0';
+      }
+    }
+  }
+
+  inline int length() const {
+    return length_;
+  }
+
+  inline char* operator*() { return str_; }
+  inline const char* operator*() const { return str_; }
+
+  inline ~Utf8String() {
+    if (str_ != str_st_) {
+      free(str_);
+    }
+  }
+
+ private:
+  NAN_DISALLOW_ASSIGN_COPY_MOVE(Utf8String)
+
+  int length_;
+  char *str_;
+  char str_st_[1024];
+};
+
+#endif  // NODE_MODULE_VERSION
+
+typedef void (*FreeCallback)(char *data, void *hint);
+
+typedef const FunctionCallbackInfo<v8::Value>& NAN_METHOD_ARGS_TYPE;
+typedef void NAN_METHOD_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Value>& NAN_GETTER_ARGS_TYPE;
+typedef void NAN_GETTER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<void>& NAN_SETTER_ARGS_TYPE;
+typedef void NAN_SETTER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Value>&
+    NAN_PROPERTY_GETTER_ARGS_TYPE;
+typedef void NAN_PROPERTY_GETTER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Value>&
+    NAN_PROPERTY_SETTER_ARGS_TYPE;
+typedef void NAN_PROPERTY_SETTER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Array>&
+    NAN_PROPERTY_ENUMERATOR_ARGS_TYPE;
+typedef void NAN_PROPERTY_ENUMERATOR_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Boolean>&
+    NAN_PROPERTY_DELETER_ARGS_TYPE;
+typedef void NAN_PROPERTY_DELETER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Integer>&
+    NAN_PROPERTY_QUERY_ARGS_TYPE;
+typedef void NAN_PROPERTY_QUERY_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Value>& NAN_INDEX_GETTER_ARGS_TYPE;
+typedef void NAN_INDEX_GETTER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Value>& NAN_INDEX_SETTER_ARGS_TYPE;
+typedef void NAN_INDEX_SETTER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Array>&
+    NAN_INDEX_ENUMERATOR_ARGS_TYPE;
+typedef void NAN_INDEX_ENUMERATOR_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Boolean>&
+    NAN_INDEX_DELETER_ARGS_TYPE;
+typedef void NAN_INDEX_DELETER_RETURN_TYPE;
+
+typedef const PropertyCallbackInfo<v8::Integer>&
+    NAN_INDEX_QUERY_ARGS_TYPE;
+typedef void NAN_INDEX_QUERY_RETURN_TYPE;
+
+#define NAN_METHOD(name)                                                       \
+    Nan::NAN_METHOD_RETURN_TYPE name(Nan::NAN_METHOD_ARGS_TYPE info)
+#define NAN_GETTER(name)                                                       \
+    Nan::NAN_GETTER_RETURN_TYPE name(                                          \
+        v8::Local<v8::String> property                                         \
+      , Nan::NAN_GETTER_ARGS_TYPE info)
+#define NAN_SETTER(name)                                                       \
+    Nan::NAN_SETTER_RETURN_TYPE name(                                          \
+        v8::Local<v8::String> property                                         \
+      , v8::Local<v8::Value> value                                             \
+      , Nan::NAN_SETTER_ARGS_TYPE info)
+#define NAN_PROPERTY_GETTER(name)                                              \
+    Nan::NAN_PROPERTY_GETTER_RETURN_TYPE name(                                 \
+        v8::Local<v8::String> property                                         \
+      , Nan::NAN_PROPERTY_GETTER_ARGS_TYPE info)
+#define NAN_PROPERTY_SETTER(name)                                              \
+    Nan::NAN_PROPERTY_SETTER_RETURN_TYPE name(                                 \
+        v8::Local<v8::String> property                                         \
+      , v8::Local<v8::Value> value                                             \
+      , Nan::NAN_PROPERTY_SETTER_ARGS_TYPE info)
+#define NAN_PROPERTY_ENUMERATOR(name)                                          \
+    Nan::NAN_PROPERTY_ENUMERATOR_RETURN_TYPE name(                             \
+        Nan::NAN_PROPERTY_ENUMERATOR_ARGS_TYPE info)
+#define NAN_PROPERTY_DELETER(name)                                             \
+    Nan::NAN_PROPERTY_DELETER_RETURN_TYPE name(                                \
+        v8::Local<v8::String> property                                         \
+      , Nan::NAN_PROPERTY_DELETER_ARGS_TYPE info)
+#define NAN_PROPERTY_QUERY(name)                                               \
+    Nan::NAN_PROPERTY_QUERY_RETURN_TYPE name(                                  \
+        v8::Local<v8::String> property                                         \
+      , Nan::NAN_PROPERTY_QUERY_ARGS_TYPE info)
+# define NAN_INDEX_GETTER(name)                                                \
+    Nan::NAN_INDEX_GETTER_RETURN_TYPE name(                                    \
+        uint32_t index                                                         \
+      , Nan::NAN_INDEX_GETTER_ARGS_TYPE info)
+#define NAN_INDEX_SETTER(name)                                                 \
+    Nan::NAN_INDEX_SETTER_RETURN_TYPE name(                                    \
+        uint32_t index                                                         \
+      , v8::Local<v8::Value> value                                             \
+      , Nan::NAN_INDEX_SETTER_ARGS_TYPE info)
+#define NAN_INDEX_ENUMERATOR(name)                                             \
+    Nan::NAN_INDEX_ENUMERATOR_RETURN_TYPE                                      \
+    name(Nan::NAN_INDEX_ENUMERATOR_ARGS_TYPE info)
+#define NAN_INDEX_DELETER(name)                                                \
+    Nan::NAN_INDEX_DELETER_RETURN_TYPE name(                                   \
+        uint32_t index                                                         \
+      , Nan::NAN_INDEX_DELETER_ARGS_TYPE info)
+#define NAN_INDEX_QUERY(name)                                                  \
+    Nan::NAN_INDEX_QUERY_RETURN_TYPE name(                                     \
+        uint32_t index                                                         \
+      , Nan::NAN_INDEX_QUERY_ARGS_TYPE info)
+
+class Callback {
+ public:
+  Callback() {}
+
+  explicit Callback(const v8::Local<v8::Function> &fn) : handle_(fn) {}
+
+  ~Callback() {
+    handle_.Reset();
+  }
+
+  bool operator==(const Callback &other) const {
+    return handle_ == other.handle_;
+  }
+
+  bool operator!=(const Callback &other) const {
+    return !operator==(other);
+  }
+
+  inline
+  v8::Local<v8::Function> operator*() const { return GetFunction(); }
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> operator()(
+      v8::Local<v8::Object> target
+    , int argc = 0
+    , v8::Local<v8::Value> argv[] = 0) const {
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource async("nan:Callback:operator()");
+    return Call_(isolate, target, argc, argv, &async)
+        .FromMaybe(v8::Local<v8::Value>());
+# else
+    return Call_(isolate, target, argc, argv);
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#else
+    return Call_(target, argc, argv);
+#endif  //  NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  }
+
+  NAN_DEPRECATED inline v8::Local<v8::Value> operator()(
+      int argc = 0
+    , v8::Local<v8::Value> argv[] = 0) const {
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource async("nan:Callback:operator()");
+    return scope.Escape(Call_(isolate, isolate->GetCurrentContext()->Global(),
+                              argc, argv, &async)
+                            .FromMaybe(v8::Local<v8::Value>()));
+# else
+    return scope.Escape(
+        Call_(isolate, isolate->GetCurrentContext()->Global(), argc, argv));
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#else
+    v8::HandleScope scope;
+    return scope.Close(Call_(v8::Context::GetCurrent()->Global(), argc, argv));
+#endif  //  NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  }
+
+  inline MaybeLocal<v8::Value> operator()(
+      AsyncResource* resource
+    , int argc = 0
+    , v8::Local<v8::Value> argv[] = 0) const {
+    return this->Call(argc, argv, resource);
+  }
+
+  inline MaybeLocal<v8::Value> operator()(
+      AsyncResource* resource
+    , v8::Local<v8::Object> target
+    , int argc = 0
+    , v8::Local<v8::Value> argv[] = 0) const {
+    return this->Call(target, argc, argv, resource);
+  }
+
+  // TODO(kkoopa): remove
+  inline void SetFunction(const v8::Local<v8::Function> &fn) {
+    Reset(fn);
+  }
+
+  inline void Reset(const v8::Local<v8::Function> &fn) {
+    handle_.Reset(fn);
+  }
+
+  inline void Reset() {
+    handle_.Reset();
+  }
+
+  inline v8::Local<v8::Function> GetFunction() const {
+    return New(handle_);
+  }
+
+  inline bool IsEmpty() const {
+    return handle_.IsEmpty();
+  }
+
+  // Deprecated: For async callbacks Use the versions that accept an
+  // AsyncResource. If this callback does not correspond to an async resource,
+  // that is, it is a synchronous function call on a non-empty JS stack, you
+  // should Nan::Call instead.
+  NAN_DEPRECATED inline v8::Local<v8::Value>
+  Call(v8::Local<v8::Object> target
+     , int argc
+     , v8::Local<v8::Value> argv[]) const {
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource async("nan:Callback:Call");
+    return Call_(isolate, target, argc, argv, &async)
+        .FromMaybe(v8::Local<v8::Value>());
+# else
+    return Call_(isolate, target, argc, argv);
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#else
+    return Call_(target, argc, argv);
+#endif
+  }
+
+  // Deprecated: For async callbacks Use the versions that accept an
+  // AsyncResource. If this callback does not correspond to an async resource,
+  // that is, it is a synchronous function call on a non-empty JS stack, you
+  // should Nan::Call instead.
+  NAN_DEPRECATED inline v8::Local<v8::Value>
+  Call(int argc, v8::Local<v8::Value> argv[]) const {
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+# if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    AsyncResource async("nan:Callback:Call");
+    return scope.Escape(Call_(isolate, isolate->GetCurrentContext()->Global(),
+                              argc, argv, &async)
+                            .FromMaybe(v8::Local<v8::Value>()));
+# else
+    return scope.Escape(
+        Call_(isolate, isolate->GetCurrentContext()->Global(), argc, argv));
+# endif  // NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+#else
+    v8::HandleScope scope;
+    return scope.Close(Call_(v8::Context::GetCurrent()->Global(), argc, argv));
+#endif
+  }
+
+  inline MaybeLocal<v8::Value>
+  Call(v8::Local<v8::Object> target
+     , int argc
+     , v8::Local<v8::Value> argv[]
+     , AsyncResource* resource) const {
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    return Call_(isolate, target, argc, argv, resource);
+#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    return Call_(isolate, target, argc, argv);
+#else
+    return Call_(target, argc, argv);
+#endif
+  }
+
+  inline MaybeLocal<v8::Value>
+  Call(int argc, v8::Local<v8::Value> argv[], AsyncResource* resource) const {
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    return Call(isolate->GetCurrentContext()->Global(), argc, argv, resource);
+#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+    v8::Isolate *isolate = v8::Isolate::GetCurrent();
+    v8::EscapableHandleScope scope(isolate);
+    return scope.Escape(
+        Call_(isolate, isolate->GetCurrentContext()->Global(), argc, argv));
+#else
+    v8::HandleScope scope;
+    return scope.Close(Call_(v8::Context::GetCurrent()->Global(), argc, argv));
+#endif
+  }
+
+ private:
+  NAN_DISALLOW_ASSIGN_COPY_MOVE(Callback)
+  Persistent<v8::Function> handle_;
+
+#if NODE_MODULE_VERSION >= NODE_9_0_MODULE_VERSION
+  MaybeLocal<v8::Value> Call_(v8::Isolate *isolate
+                            , v8::Local<v8::Object> target
+                            , int argc
+                            , v8::Local<v8::Value> argv[]
+                            , AsyncResource* resource) const {
+    EscapableHandleScope scope;
+    v8::Local<v8::Function> func = New(handle_);
+    auto maybe = resource->runInAsyncScope(target, func, argc, argv);
+    v8::Local<v8::Value> local;
+    if (!maybe.ToLocal(&local)) return MaybeLocal<v8::Value>();
+    return scope.Escape(local);
+  }
+#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  v8::Local<v8::Value> Call_(v8::Isolate *isolate
+                           , v8::Local<v8::Object> target
+                           , int argc
+                           , v8::Local<v8::Value> argv[]) const {
+    EscapableHandleScope scope;
+
+    v8::Local<v8::Function> callback = New(handle_);
+# if NODE_MODULE_VERSION < IOJS_3_0_MODULE_VERSION
+    return scope.Escape(New(node::MakeCallback(
+        isolate
+      , target
+      , callback
+      , argc
+      , argv
+    )));
+# else
+    return scope.Escape(node::MakeCallback(
+        isolate
+      , target
+      , callback
+      , argc
+      , argv
+    ));
+# endif
+  }
+#else
+  v8::Local<v8::Value> Call_(v8::Local<v8::Object> target
+                           , int argc
+                           , v8::Local<v8::Value> argv[]) const {
+    EscapableHandleScope scope;
+
+    v8::Local<v8::Function> callback = New(handle_);
+    return scope.Escape(New(node::MakeCallback(
+        target
+      , callback
+      , argc
+      , argv
+    )));
+  }
+#endif
+};
+
+inline MaybeLocal<v8::Value> Call(
+    const Nan::Callback& callback
+  , v8::Local<v8::Object> recv
+  , int argc
+  , v8::Local<v8::Value> argv[]) {
+  return Call(*callback, recv, argc, argv);
+}
+
+inline MaybeLocal<v8::Value> Call(
+    const Nan::Callback& callback
+  , int argc
+  , v8::Local<v8::Value> argv[]) {
+#if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  v8::EscapableHandleScope scope(isolate);
+  return scope.Escape(
+      Call(*callback, isolate->GetCurrentContext()->Global(), argc, argv)
+          .FromMaybe(v8::Local<v8::Value>()));
+#else
+  EscapableHandleScope scope;
+  return scope.Escape(
+      Call(*callback, v8::Context::GetCurrent()->Global(), argc, argv)
+          .FromMaybe(v8::Local<v8::Value>()));
+#endif
+}
+
+inline MaybeLocal<v8::Value> Call(
+    v8::Local<v8::String> symbol
+  , v8::Local<v8::Object> recv
+  , int argc
+  , v8::Local<v8::Value> argv[]) {
+  EscapableHandleScope scope;
+  v8::Local<v8::Value> fn_v =
+      Get(recv, symbol).FromMaybe(v8::Local<v8::Value>());
+  if (fn_v.IsEmpty() || !fn_v->IsFunction()) return v8::Local<v8::Value>();
+  v8::Local<v8::Function> fn = fn_v.As<v8::Function>();
+  return scope.Escape(
+      Call(fn, recv, argc, argv).FromMaybe(v8::Local<v8::Value>()));
+}
+
+inline MaybeLocal<v8::Value> Call(
+    const char* method
+  , v8::Local<v8::Object> recv
+  , int argc
+  , v8::Local<v8::Value> argv[]) {
+  EscapableHandleScope scope;
+  v8::Local<v8::String> method_string =
+      New<v8::String>(method).ToLocalChecked();
+  return scope.Escape(
+      Call(method_string, recv, argc, argv).FromMaybe(v8::Local<v8::Value>()));
+}
+
+/* abstract */ class AsyncWorker {
+ public:
+  explicit AsyncWorker(Callback *callback_,
+                       const char* resource_name = "nan:AsyncWorker")
+      : callback(callback_), errmsg_(NULL) {
+    request.data = this;
+
+    HandleScope scope;
+    v8::Local<v8::Object> obj = New<v8::Object>();
+    persistentHandle.Reset(obj);
+    async_resource = new AsyncResource(resource_name, obj);
+  }
+
+  virtual ~AsyncWorker() {
+    HandleScope scope;
+
+    if (!persistentHandle.IsEmpty())
+      persistentHandle.Reset();
+    delete callback;
+    delete[] errmsg_;
+    delete async_resource;
+  }
+
+  virtual void WorkComplete() {
+    HandleScope scope;
+
+    if (errmsg_ == NULL)
+      HandleOKCallback();
+    else
+      HandleErrorCallback();
+    delete callback;
+    callback = NULL;
+  }
+
+  inline void SaveToPersistent(
+      const char *key, const v8::Local<v8::Value> &value) {
+    HandleScope scope;
+    Set(New(persistentHandle), New(key).ToLocalChecked(), value).FromJust();
+  }
+
+  inline void SaveToPersistent(
+      const v8::Local<v8::String> &key, const v8::Local<v8::Value> &value) {
+    HandleScope scope;
+    Set(New(persistentHandle), key, value).FromJust();
+  }
+
+  inline void SaveToPersistent(
+      uint32_t index, const v8::Local<v8::Value> &value) {
+    HandleScope scope;
+    Set(New(persistentHandle), index, value).FromJust();
+  }
+
+  inline v8::Local<v8::Value> GetFromPersistent(const char *key) const {
+    EscapableHandleScope scope;
+    return scope.Escape(
+        Get(New(persistentHandle), New(key).ToLocalChecked())
+        .FromMaybe(v8::Local<v8::Value>()));
+  }
+
+  inline v8::Local<v8::Value>
+  GetFromPersistent(const v8::Local<v8::String> &key) const {
+    EscapableHandleScope scope;
+    return scope.Escape(
+        Get(New(persistentHandle), key)
+        .FromMaybe(v8::Local<v8::Value>()));
+  }
+
+  inline v8::Local<v8::Value> GetFromPersistent(uint32_t index) const {
+    EscapableHandleScope scope;
+    return scope.Escape(
+        Get(New(persistentHandle), index)
+        .FromMaybe(v8::Local<v8::Value>()));
+  }
+
+  virtual void Execute() = 0;
+
+  uv_work_t request;
+
+  virtual void Destroy() {
+      delete this;
+  }
+
+ protected:
+  Persistent<v8::Object> persistentHandle;
+  Callback *callback;
+  AsyncResource *async_resource;
+
+  virtual void HandleOKCallback() {
+    HandleScope scope;
+
+    callback->Call(0, NULL, async_resource);
+  }
+
+  virtual void HandleErrorCallback() {
+    HandleScope scope;
+
+    v8::Local<v8::Value> argv[] = {
+      v8::Exception::Error(New<v8::String>(ErrorMessage()).ToLocalChecked())
+    };
+    callback->Call(1, argv, async_resource);
+  }
+
+  void SetErrorMessage(const char *msg) {
+    delete[] errmsg_;
+
+    size_t size = strlen(msg) + 1;
+    errmsg_ = new char[size];
+    memcpy(errmsg_, msg, size);
+  }
+
+  const char* ErrorMessage() const {
+    return errmsg_;
+  }
+
+ private:
+  NAN_DISALLOW_ASSIGN_COPY_MOVE(AsyncWorker)
+  char *errmsg_;
+};
+
+/* abstract */ class AsyncBareProgressWorkerBase : public AsyncWorker {
+ public:
+  explicit AsyncBareProgressWorkerBase(
+      Callback *callback_,
+      const char* resource_name = "nan:AsyncBareProgressWorkerBase")
+      : AsyncWorker(callback_, resource_name) {
+    uv_async_init(
+        GetCurrentEventLoop()
+      , &async
+      , AsyncProgress_
+    );
+    async.data = this;
+  }
+
+  virtual ~AsyncBareProgressWorkerBase() {
+  }
+
+  virtual void WorkProgress() = 0;
+
+  virtual void Destroy() {
+      uv_close(reinterpret_cast<uv_handle_t*>(&async), AsyncClose_);
+  }
+
+ private:
+  inline static NAUV_WORK_CB(AsyncProgress_) {
+    AsyncBareProgressWorkerBase *worker =
+            static_cast<AsyncBareProgressWorkerBase*>(async->data);
+    worker->WorkProgress();
+  }
+
+  inline static void AsyncClose_(uv_handle_t* handle) {
+    AsyncBareProgressWorkerBase *worker =
+            static_cast<AsyncBareProgressWorkerBase*>(handle->data);
+    delete worker;
+  }
+
+ protected:
+  uv_async_t async;
+};
+
+template<class T>
+/* abstract */
+class AsyncBareProgressWorker : public AsyncBareProgressWorkerBase {
+ public:
+  explicit AsyncBareProgressWorker(
+      Callback *callback_,
+      const char* resource_name = "nan:AsyncBareProgressWorker")
+      : AsyncBareProgressWorkerBase(callback_, resource_name) {
+    uv_mutex_init(&async_lock);
+  }
+
+  virtual ~AsyncBareProgressWorker() {
+    uv_mutex_destroy(&async_lock);
+  }
+
+  class ExecutionProgress {
+    friend class AsyncBareProgressWorker;
+   public:
+    void Signal() const {
+      uv_mutex_lock(&that_->async_lock);
+      uv_async_send(&that_->async);
+      uv_mutex_unlock(&that_->async_lock);
+    }
+
+    void Send(const T* data, size_t count) const {
+      that_->SendProgress_(data, count);
+    }
+
+   private:
+    explicit ExecutionProgress(AsyncBareProgressWorker *that) : that_(that) {}
+    NAN_DISALLOW_ASSIGN_COPY_MOVE(ExecutionProgress)
+    AsyncBareProgressWorker* const that_;
+  };
+
+  virtual void Execute(const ExecutionProgress& progress) = 0;
+  virtual void HandleProgressCallback(const T *data, size_t size) = 0;
+
+ protected:
+  uv_mutex_t async_lock;
+
+ private:
+  void Execute() /*final override*/ {
+    ExecutionProgress progress(this);
+    Execute(progress);
+  }
+
+  virtual void SendProgress_(const T *data, size_t count) = 0;
+};
+
+template<class T>
+/* abstract */
+class AsyncProgressWorkerBase : public AsyncBareProgressWorker<T> {
+ public:
+  explicit AsyncProgressWorkerBase(
+      Callback *callback_,
+      const char* resource_name = "nan:AsyncProgressWorkerBase")
+      : AsyncBareProgressWorker<T>(callback_, resource_name), asyncdata_(NULL),
+        asyncsize_(0) {
+  }
+
+  virtual ~AsyncProgressWorkerBase() {
+    delete[] asyncdata_;
+  }
+
+  void WorkProgress() {
+    uv_mutex_lock(&this->async_lock);
+    T *data = asyncdata_;
+    size_t size = asyncsize_;
+    asyncdata_ = NULL;
+    asyncsize_ = 0;
+    uv_mutex_unlock(&this->async_lock);
+
+    // Don't send progress events after we've already completed.
+    if (this->callback) {
+        this->HandleProgressCallback(data, size);
+    }
+    delete[] data;
+  }
+
+ private:
+  void SendProgress_(const T *data, size_t count) {
+    T *new_data = new T[count];
+    std::copy(data, data + count, new_data);
+
+    uv_mutex_lock(&this->async_lock);
+    T *old_data = asyncdata_;
+    asyncdata_ = new_data;
+    asyncsize_ = count;
+    uv_async_send(&this->async);
+    uv_mutex_unlock(&this->async_lock);
+
+    delete[] old_data;
+  }
+
+  T *asyncdata_;
+  size_t asyncsize_;
+};
+
+// This ensures compatibility to the previous un-templated AsyncProgressWorker
+// class definition.
+typedef AsyncProgressWorkerBase<char> AsyncProgressWorker;
+
+template<class T>
+/* abstract */
+class AsyncBareProgressQueueWorker : public AsyncBareProgressWorkerBase {
+ public:
+  explicit AsyncBareProgressQueueWorker(
+      Callback *callback_,
+      const char* resource_name = "nan:AsyncBareProgressQueueWorker")
+      : AsyncBareProgressWorkerBase(callback_, resource_name) {
+  }
+
+  virtual ~AsyncBareProgressQueueWorker() {
+  }
+
+  class ExecutionProgress {
+    friend class AsyncBareProgressQueueWorker;
+   public:
+    void Send(const T* data, size_t count) const {
+      that_->SendProgress_(data, count);
+    }
+
+   private:
+    explicit ExecutionProgress(AsyncBareProgressQueueWorker *that)
+        : that_(that) {}
+    NAN_DISALLOW_ASSIGN_COPY_MOVE(ExecutionProgress)
+    AsyncBareProgressQueueWorker* const that_;
+  };
+
+  virtual void Execute(const ExecutionProgress& progress) = 0;
+  virtual void HandleProgressCallback(const T *data, size_t size) = 0;
+
+ private:
+  void Execute() /*final override*/ {
+    ExecutionProgress progress(this);
+    Execute(progress);
+  }
+
+  virtual void SendProgress_(const T *data, size_t count) = 0;
+};
+
+template<class T>
+/* abstract */
+class AsyncProgressQueueWorker : public AsyncBareProgressQueueWorker<T> {
+ public:
+  explicit AsyncProgressQueueWorker(
+      Callback *callback_,
+      const char* resource_name = "nan:AsyncProgressQueueWorker")
+      : AsyncBareProgressQueueWorker<T>(callback_) {
+    uv_mutex_init(&async_lock);
+  }
+
+  virtual ~AsyncProgressQueueWorker() {
+    uv_mutex_lock(&async_lock);
+
+    while (!asyncdata_.empty()) {
+      std::pair<T*, size_t> &datapair = asyncdata_.front();
+      T *data = datapair.first;
+
+      asyncdata_.pop();
+
+      delete[] data;
+    }
+
+    uv_mutex_unlock(&async_lock);
+    uv_mutex_destroy(&async_lock);
+  }
+
+  void WorkComplete() {
+    WorkProgress();
+    AsyncWorker::WorkComplete();
+  }
+
+  void WorkProgress() {
+    uv_mutex_lock(&async_lock);
+
+    while (!asyncdata_.empty()) {
+      std::pair<T*, size_t> &datapair = asyncdata_.front();
+
+      T *data = datapair.first;
+      size_t size = datapair.second;
+
+      asyncdata_.pop();
+      uv_mutex_unlock(&async_lock);
+
+      // Don't send progress events after we've already completed.
+      if (this->callback) {
+          this->HandleProgressCallback(data, size);
+      }
+
+      delete[] data;
+
+      uv_mutex_lock(&async_lock);
+    }
+
+    uv_mutex_unlock(&async_lock);
+  }
+
+ private:
+  void SendProgress_(const T *data, size_t count) {
+    T *new_data = new T[count];
+    std::copy(data, data + count, new_data);
+
+    uv_mutex_lock(&async_lock);
+    asyncdata_.push(std::pair<T*, size_t>(new_data, count));
+    uv_mutex_unlock(&async_lock);
+
+    uv_async_send(&this->async);
+  }
+
+  uv_mutex_t async_lock;
+  std::queue<std::pair<T*, size_t> > asyncdata_;
+};
+
+inline void AsyncExecute (uv_work_t* req) {
+  AsyncWorker *worker = static_cast<AsyncWorker*>(req->data);
+  worker->Execute();
+}
+
+/* uv_after_work_cb has 1 argument before node-v0.9.4 and
+ * 2 arguments since node-v0.9.4
+ * https://github.com/libuv/libuv/commit/92fb84b751e18f032c02609467f44bfe927b80c5
+ */
+inline void AsyncExecuteComplete(uv_work_t *req) {
+  AsyncWorker* worker = static_cast<AsyncWorker*>(req->data);
+  worker->WorkComplete();
+  worker->Destroy();
+}
+inline void AsyncExecuteComplete (uv_work_t* req, int status) {
+  AsyncExecuteComplete(req);
+}
+
+inline void AsyncQueueWorker (AsyncWorker* worker) {
+  uv_queue_work(
+      GetCurrentEventLoop()
+    , &worker->request
+    , AsyncExecute
+    , AsyncExecuteComplete
+  );
+}
+
+namespace imp {
+
+inline
+ExternalOneByteStringResource const*
+GetExternalResource(v8::Local<v8::String> str) {
+#if NODE_MODULE_VERSION < ATOM_0_21_MODULE_VERSION
+    return str->GetExternalAsciiStringResource();
+#else
+    return str->GetExternalOneByteStringResource();
+#endif
+}
+
+inline
+bool
+IsExternal(v8::Local<v8::String> str) {
+#if NODE_MODULE_VERSION < ATOM_0_21_MODULE_VERSION
+    return str->IsExternalAscii();
+#else
+    return str->IsExternalOneByte();
+#endif
+}
+
+}  // end of namespace imp
+
+enum Encoding {ASCII, UTF8, BASE64, UCS2, BINARY, HEX, BUFFER};
+
+#if NODE_MODULE_VERSION < NODE_0_10_MODULE_VERSION
+# include "nan_string_bytes.h"  // NOLINT(build/include)
+#endif
+
+inline v8::Local<v8::Value> Encode(
+    const void *buf, size_t len, enum Encoding encoding = BINARY) {
+#if (NODE_MODULE_VERSION >= ATOM_0_21_MODULE_VERSION)
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  node::encoding node_enc = static_cast<node::encoding>(encoding);
+
+  if (encoding == UCS2) {
+    return node::Encode(
+        isolate
+      , reinterpret_cast<const uint16_t *>(buf)
+      , len / 2);
+  } else {
+    return node::Encode(
+        isolate
+      , reinterpret_cast<const char *>(buf)
+      , len
+      , node_enc);
+  }
+#elif (NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION)
+  return node::Encode(
+      v8::Isolate::GetCurrent()
+    , buf, len
+    , static_cast<node::encoding>(encoding));
+#else
+# if NODE_MODULE_VERSION >= NODE_0_10_MODULE_VERSION
+  return node::Encode(buf, len, static_cast<node::encoding>(encoding));
+# else
+  return imp::Encode(reinterpret_cast<const char*>(buf), len, encoding);
+# endif
+#endif
+}
+
+inline ssize_t DecodeBytes(
+    v8::Local<v8::Value> val, enum Encoding encoding = BINARY) {
+#if (NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION)
+  return node::DecodeBytes(
+      v8::Isolate::GetCurrent()
+    , val
+    , static_cast<node::encoding>(encoding));
+#else
+# if (NODE_MODULE_VERSION < NODE_0_10_MODULE_VERSION)
+  if (encoding == BUFFER) {
+    return node::DecodeBytes(val, node::BINARY);
+  }
+# endif
+  return node::DecodeBytes(val, static_cast<node::encoding>(encoding));
+#endif
+}
+
+inline ssize_t DecodeWrite(
+    char *buf
+  , size_t len
+  , v8::Local<v8::Value> val
+  , enum Encoding encoding = BINARY) {
+#if (NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION)
+  return node::DecodeWrite(
+      v8::Isolate::GetCurrent()
+    , buf
+    , len
+    , val
+    , static_cast<node::encoding>(encoding));
+#else
+# if (NODE_MODULE_VERSION < NODE_0_10_MODULE_VERSION)
+  if (encoding == BUFFER) {
+    return node::DecodeWrite(buf, len, val, node::BINARY);
+  }
+# endif
+  return node::DecodeWrite(
+      buf
+    , len
+    , val
+    , static_cast<node::encoding>(encoding));
+#endif
+}
+
+inline void SetPrototypeTemplate(
+    v8::Local<v8::FunctionTemplate> templ
+  , const char *name
+  , v8::Local<v8::Data> value
+) {
+  HandleScope scope;
+  SetTemplate(templ->PrototypeTemplate(), name, value);
+}
+
+inline void SetPrototypeTemplate(
+    v8::Local<v8::FunctionTemplate> templ
+  , v8::Local<v8::String> name
+  , v8::Local<v8::Data> value
+  , v8::PropertyAttribute attributes
+) {
+  HandleScope scope;
+  SetTemplate(templ->PrototypeTemplate(), name, value, attributes);
+}
+
+inline void SetInstanceTemplate(
+    v8::Local<v8::FunctionTemplate> templ
+  , const char *name
+  , v8::Local<v8::Data> value
+) {
+  HandleScope scope;
+  SetTemplate(templ->InstanceTemplate(), name, value);
+}
+
+inline void SetInstanceTemplate(
+    v8::Local<v8::FunctionTemplate> templ
+  , v8::Local<v8::String> name
+  , v8::Local<v8::Data> value
+  , v8::PropertyAttribute attributes
+) {
+  HandleScope scope;
+  SetTemplate(templ->InstanceTemplate(), name, value, attributes);
+}
+
+namespace imp {
+
+// Note(@agnat): Helper to distinguish different receiver types. The first
+// version deals with receivers derived from v8::Template. The second version
+// handles everything else. The final argument only serves as discriminator and
+// is unused.
+template <typename T>
+inline
+void
+SetMethodAux(T recv,
+             v8::Local<v8::String> name,
+             v8::Local<v8::FunctionTemplate> tpl,
+             v8::Template *) {
+  recv->Set(name, tpl);
+}
+
+template <typename T>
+inline
+void
+SetMethodAux(T recv,
+             v8::Local<v8::String> name,
+             v8::Local<v8::FunctionTemplate> tpl,
+             ...) {
+  Set(recv, name, GetFunction(tpl).ToLocalChecked());
+}
+
+}  // end of namespace imp
+
+template <typename T, template <typename> class HandleType>
+inline void SetMethod(
+    HandleType<T> recv
+  , const char *name
+  , FunctionCallback callback
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()) {
+  HandleScope scope;
+  v8::Local<v8::FunctionTemplate> t = New<v8::FunctionTemplate>(callback, data);
+  v8::Local<v8::String> fn_name = New(name).ToLocalChecked();
+  t->SetClassName(fn_name);
+  // Note(@agnat): Pass an empty T* as discriminator. See note on
+  // SetMethodAux(...) above
+  imp::SetMethodAux(recv, fn_name, t, static_cast<T*>(0));
+}
+
+inline void SetPrototypeMethod(
+    v8::Local<v8::FunctionTemplate> recv
+  , const char* name
+  , FunctionCallback callback
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()) {
+  HandleScope scope;
+  v8::Local<v8::FunctionTemplate> t = New<v8::FunctionTemplate>(
+      callback
+    , data
+    , New<v8::Signature>(recv));
+  v8::Local<v8::String> fn_name = New(name).ToLocalChecked();
+  recv->PrototypeTemplate()->Set(fn_name, t);
+  t->SetClassName(fn_name);
+}
+
+//=== Accessors and Such =======================================================
+
+inline void SetAccessor(
+    v8::Local<v8::ObjectTemplate> tpl
+  , v8::Local<v8::String> name
+  , GetterCallback getter
+  , SetterCallback setter = 0
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()
+  , v8::AccessControl settings = v8::DEFAULT
+  , v8::PropertyAttribute attribute = v8::None
+  , imp::Sig signature = imp::Sig()) {
+  HandleScope scope;
+
+  imp::NativeGetter getter_ =
+      imp::GetterCallbackWrapper;
+  imp::NativeSetter setter_ =
+      setter ? imp::SetterCallbackWrapper : 0;
+
+  v8::Local<v8::ObjectTemplate> otpl = New<v8::ObjectTemplate>();
+  otpl->SetInternalFieldCount(imp::kAccessorFieldCount);
+  v8::Local<v8::Object> obj = NewInstance(otpl).ToLocalChecked();
+
+  obj->SetInternalField(
+      imp::kGetterIndex
+    , New<v8::External>(reinterpret_cast<void *>(getter)));
+
+  if (setter != 0) {
+    obj->SetInternalField(
+        imp::kSetterIndex
+      , New<v8::External>(reinterpret_cast<void *>(setter)));
+  }
+
+  if (!data.IsEmpty()) {
+    obj->SetInternalField(imp::kDataIndex, data);
+  }
+
+  tpl->SetAccessor(
+      name
+    , getter_
+    , setter_
+    , obj
+    , settings
+    , attribute
+    , signature);
+}
+
+inline bool SetAccessor(
+    v8::Local<v8::Object> obj
+  , v8::Local<v8::String> name
+  , GetterCallback getter
+  , SetterCallback setter = 0
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()
+  , v8::AccessControl settings = v8::DEFAULT
+  , v8::PropertyAttribute attribute = v8::None) {
+  HandleScope scope;
+
+  imp::NativeGetter getter_ =
+      imp::GetterCallbackWrapper;
+  imp::NativeSetter setter_ =
+      setter ? imp::SetterCallbackWrapper : 0;
+
+  v8::Local<v8::ObjectTemplate> otpl = New<v8::ObjectTemplate>();
+  otpl->SetInternalFieldCount(imp::kAccessorFieldCount);
+  v8::Local<v8::Object> dataobj = NewInstance(otpl).ToLocalChecked();
+
+  dataobj->SetInternalField(
+      imp::kGetterIndex
+    , New<v8::External>(reinterpret_cast<void *>(getter)));
+
+  if (!data.IsEmpty()) {
+    dataobj->SetInternalField(imp::kDataIndex, data);
+  }
+
+  if (setter) {
+    dataobj->SetInternalField(
+        imp::kSetterIndex
+      , New<v8::External>(reinterpret_cast<void *>(setter)));
+  }
+
+#if (NODE_MODULE_VERSION >= NODE_6_0_MODULE_VERSION)
+  return obj->SetAccessor(
+      GetCurrentContext()
+    , name
+    , getter_
+    , setter_
+    , dataobj
+    , settings
+    , attribute).FromMaybe(false);
+#else
+  return obj->SetAccessor(
+      name
+    , getter_
+    , setter_
+    , dataobj
+    , settings
+    , attribute);
+#endif
+}
+
+inline void SetNamedPropertyHandler(
+    v8::Local<v8::ObjectTemplate> tpl
+  , PropertyGetterCallback getter
+  , PropertySetterCallback setter = 0
+  , PropertyQueryCallback query = 0
+  , PropertyDeleterCallback deleter = 0
+  , PropertyEnumeratorCallback enumerator = 0
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()) {
+  HandleScope scope;
+
+  imp::NativePropertyGetter getter_ =
+      imp::PropertyGetterCallbackWrapper;
+  imp::NativePropertySetter setter_ =
+      setter ? imp::PropertySetterCallbackWrapper : 0;
+  imp::NativePropertyQuery query_ =
+      query ? imp::PropertyQueryCallbackWrapper : 0;
+  imp::NativePropertyDeleter *deleter_ =
+      deleter ? imp::PropertyDeleterCallbackWrapper : 0;
+  imp::NativePropertyEnumerator enumerator_ =
+      enumerator ? imp::PropertyEnumeratorCallbackWrapper : 0;
+
+  v8::Local<v8::ObjectTemplate> otpl = New<v8::ObjectTemplate>();
+  otpl->SetInternalFieldCount(imp::kPropertyFieldCount);
+  v8::Local<v8::Object> obj = NewInstance(otpl).ToLocalChecked();
+  obj->SetInternalField(
+      imp::kPropertyGetterIndex
+    , New<v8::External>(reinterpret_cast<void *>(getter)));
+
+  if (setter) {
+    obj->SetInternalField(
+        imp::kPropertySetterIndex
+      , New<v8::External>(reinterpret_cast<void *>(setter)));
+  }
+
+  if (query) {
+    obj->SetInternalField(
+        imp::kPropertyQueryIndex
+      , New<v8::External>(reinterpret_cast<void *>(query)));
+  }
+
+  if (deleter) {
+    obj->SetInternalField(
+        imp::kPropertyDeleterIndex
+      , New<v8::External>(reinterpret_cast<void *>(deleter)));
+  }
+
+  if (enumerator) {
+    obj->SetInternalField(
+        imp::kPropertyEnumeratorIndex
+      , New<v8::External>(reinterpret_cast<void *>(enumerator)));
+  }
+
+  if (!data.IsEmpty()) {
+    obj->SetInternalField(imp::kDataIndex, data);
+  }
+
+#if NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
+  tpl->SetHandler(v8::NamedPropertyHandlerConfiguration(
+      getter_, setter_, query_, deleter_, enumerator_, obj));
+#else
+  tpl->SetNamedPropertyHandler(
+      getter_
+    , setter_
+    , query_
+    , deleter_
+    , enumerator_
+    , obj);
+#endif
+}
+
+inline void SetIndexedPropertyHandler(
+    v8::Local<v8::ObjectTemplate> tpl
+  , IndexGetterCallback getter
+  , IndexSetterCallback setter = 0
+  , IndexQueryCallback query = 0
+  , IndexDeleterCallback deleter = 0
+  , IndexEnumeratorCallback enumerator = 0
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()) {
+  HandleScope scope;
+
+  imp::NativeIndexGetter getter_ =
+      imp::IndexGetterCallbackWrapper;
+  imp::NativeIndexSetter setter_ =
+      setter ? imp::IndexSetterCallbackWrapper : 0;
+  imp::NativeIndexQuery query_ =
+      query ? imp::IndexQueryCallbackWrapper : 0;
+  imp::NativeIndexDeleter deleter_ =
+      deleter ? imp::IndexDeleterCallbackWrapper : 0;
+  imp::NativeIndexEnumerator enumerator_ =
+      enumerator ? imp::IndexEnumeratorCallbackWrapper : 0;
+
+  v8::Local<v8::ObjectTemplate> otpl = New<v8::ObjectTemplate>();
+  otpl->SetInternalFieldCount(imp::kIndexPropertyFieldCount);
+  v8::Local<v8::Object> obj = NewInstance(otpl).ToLocalChecked();
+  obj->SetInternalField(
+      imp::kIndexPropertyGetterIndex
+    , New<v8::External>(reinterpret_cast<void *>(getter)));
+
+  if (setter) {
+    obj->SetInternalField(
+        imp::kIndexPropertySetterIndex
+      , New<v8::External>(reinterpret_cast<void *>(setter)));
+  }
+
+  if (query) {
+    obj->SetInternalField(
+        imp::kIndexPropertyQueryIndex
+      , New<v8::External>(reinterpret_cast<void *>(query)));
+  }
+
+  if (deleter) {
+    obj->SetInternalField(
+        imp::kIndexPropertyDeleterIndex
+      , New<v8::External>(reinterpret_cast<void *>(deleter)));
+  }
+
+  if (enumerator) {
+    obj->SetInternalField(
+        imp::kIndexPropertyEnumeratorIndex
+      , New<v8::External>(reinterpret_cast<void *>(enumerator)));
+  }
+
+  if (!data.IsEmpty()) {
+    obj->SetInternalField(imp::kDataIndex, data);
+  }
+
+#if NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
+  tpl->SetHandler(v8::IndexedPropertyHandlerConfiguration(
+      getter_, setter_, query_, deleter_, enumerator_, obj));
+#else
+  tpl->SetIndexedPropertyHandler(
+      getter_
+    , setter_
+    , query_
+    , deleter_
+    , enumerator_
+    , obj);
+#endif
+}
+
+inline void SetCallHandler(
+    v8::Local<v8::FunctionTemplate> tpl
+  , FunctionCallback callback
+  , v8::Local<v8::Value> data = v8::Local<v8::Value>()) {
+  HandleScope scope;
+
+  v8::Local<v8::ObjectTemplate> otpl = New<v8::ObjectTemplate>();
+  otpl->SetInternalFieldCount(imp::kFunctionFieldCount);
+  v8::Local<v8::Object> obj = NewInstance(otpl).ToLocalChecked();
+
+  obj->SetInternalField(
+      imp::kFunctionIndex
+    , New<v8::External>(reinterpret_cast<void *>(callback)));
+
+  if (!data.IsEmpty()) {
+    obj->SetInternalField(imp::kDataIndex, data);
+  }
+
+  tpl->SetCallHandler(imp::FunctionCallbackWrapper, obj);
+}
+
+
+inline void SetCallAsFunctionHandler(
+    v8::Local<v8::ObjectTemplate> tpl,
+    FunctionCallback callback,
+    v8::Local<v8::Value> data = v8::Local<v8::Value>()) {
+  HandleScope scope;
+
+  v8::Local<v8::ObjectTemplate> otpl = New<v8::ObjectTemplate>();
+  otpl->SetInternalFieldCount(imp::kFunctionFieldCount);
+  v8::Local<v8::Object> obj = NewInstance(otpl).ToLocalChecked();
+
+  obj->SetInternalField(
+      imp::kFunctionIndex
+    , New<v8::External>(reinterpret_cast<void *>(callback)));
+
+  if (!data.IsEmpty()) {
+    obj->SetInternalField(imp::kDataIndex, data);
+  }
+
+  tpl->SetCallAsFunctionHandler(imp::FunctionCallbackWrapper, obj);
+}
+
+//=== Weak Persistent Handling =================================================
+
+#include "nan_weak.h"  // NOLINT(build/include)
+
+//=== ObjectWrap ===============================================================
+
+#include "nan_object_wrap.h"  // NOLINT(build/include)
+
+//=== HiddenValue/Private ======================================================
+
+#include "nan_private.h"  // NOLINT(build/include)
+
+//=== Export ==================================================================
+
+inline
+void
+Export(ADDON_REGISTER_FUNCTION_ARGS_TYPE target, const char *name,
+    FunctionCallback f) {
+  HandleScope scope;
+
+  Set(target, New<v8::String>(name).ToLocalChecked(),
+      GetFunction(New<v8::FunctionTemplate>(f)).ToLocalChecked());
+}
+
+//=== Tap Reverse Binding =====================================================
+
+struct Tap {
+  explicit Tap(v8::Local<v8::Value> t) : t_() {
+    HandleScope scope;
+
+    t_.Reset(To<v8::Object>(t).ToLocalChecked());
+  }
+
+  ~Tap() { t_.Reset(); }  // not sure if necessary
+
+  inline void plan(int i) {
+    HandleScope scope;
+    v8::Local<v8::Value> arg = New(i);
+    Call("plan", New(t_), 1, &arg);
+  }
+
+  inline void ok(bool isOk, const char *msg = NULL) {
+    HandleScope scope;
+    v8::Local<v8::Value> args[2];
+    args[0] = New(isOk);
+    if (msg) args[1] = New(msg).ToLocalChecked();
+    Call("ok", New(t_), msg ? 2 : 1, args);
+  }
+
+  inline void pass(const char * msg = NULL) {
+    HandleScope scope;
+    v8::Local<v8::Value> hmsg;
+    if (msg) hmsg = New(msg).ToLocalChecked();
+    Call("pass", New(t_), msg ? 1 : 0, &hmsg);
+  }
+
+  inline void end() {
+    HandleScope scope;
+    Call("end", New(t_), 0, NULL);
+  }
+
+ private:
+  Persistent<v8::Object> t_;
+};
+
+#define NAN_STRINGIZE2(x) #x
+#define NAN_STRINGIZE(x) NAN_STRINGIZE2(x)
+#define NAN_TEST_EXPRESSION(expression) \
+  ( expression ), __FILE__ ":" NAN_STRINGIZE(__LINE__) ": " #expression
+
+#define NAN_EXPORT(target, function) Export(target, #function, function)
+
+#undef TYPE_CHECK
+
+//=== Generic Maybefication ===================================================
+
+namespace imp {
+
+template <typename T> struct Maybefier;
+
+template <typename T> struct Maybefier<v8::Local<T> > {
+  inline static MaybeLocal<T> convert(v8::Local<T> v) {
+    return v;
+  }
+};
+
+template <typename T> struct Maybefier<MaybeLocal<T> > {
+  inline static MaybeLocal<T> convert(MaybeLocal<T> v) {
+    return v;
+  }
+};
+
+}  // end of namespace imp
+
+template <typename T, template <typename> class MaybeMaybe>
+inline MaybeLocal<T>
+MakeMaybe(MaybeMaybe<T> v) {
+  return imp::Maybefier<MaybeMaybe<T> >::convert(v);
+}
+
+//=== TypedArrayContents =======================================================
+
+#include "nan_typedarray_contents.h"  // NOLINT(build/include)
+
+//=== JSON =====================================================================
+
+#include "nan_json.h"  // NOLINT(build/include)
+
+//=== ScriptOrigin =============================================================
+
+#include "nan_scriptorigin.h"  // NOLINT(build/include)
+
+}  // end of namespace Nan
+
+#endif  // NAN_H_