Send modules to native

addon.js

const addon = require('bindings')('addon');

addon.receiveModule('fs', require('fs'));
addon.receiveModule('crypto', require('crypto'));

console.log(addon.sendModule('fs') === require('fs'));
console.log(addon.sendModule('crypto') === require('crypto'));

binding.cc

#include "napi.h"
#include <unordered_map>

using Napi::Error;

typedef struct {
  std::unordered_map<std::string, Napi::ObjectReference> modules;
} AddonData;

void ReceiveModule(const Napi::CallbackInfo& info) {
  AddonData* addon_data = static_cast<AddonData*>(info.Data());
  std::string name = info[0].As<Napi::String>();
  addon_data->modules[name] = Napi::Persistent(info[1].As<Napi::Object>());
}

Napi::Value SendModule(const Napi::CallbackInfo& info) {
  AddonData* addon_data = static_cast<AddonData*>(info.Data());
  std::string name = info[0].As<Napi::String>();
  return addon_data->modules[name].Value();
}

static void DeleteAddonData(napi_env env, void* data, void* hint) {
  (void) env;
  (void) hint;
  delete static_cast<AddonData*>(data);
}

Napi::Object Init(Napi::Env env, Napi::Object exports) {
  AddonData* addon_data = new AddonData;
  NAPI_THROW_IF_FAILED(env,
      napi_wrap(env, exports, addon_data, DeleteAddonData, nullptr, nullptr),
      exports);
  exports["receiveModule"] =
      Napi::Function::New(env, ReceiveModule, "receiveModule", addon_data);
  exports["sendModule"] =
      Napi::Function::New(env, SendModule, "sendModule", addon_data);
  return exports;
}

NODE_API_MODULE(NODE_GYP_MODULE_NAME, Init)