如何使用node-addon-api保存回调以备以后使用？

class CallbackHolder {
public:
  CallbackHolder(Napi::Env env, Napi::Function callback) : callback_(Napi::Persistent(callback)) {
    callback_.SuppressDestruct();
  }

  void CallCallback() {
    Napi::Env env = callback_.Env();
    Napi::HandleScope scope(env);
    callback_.MakeCallback(env.Global(), {});
  }

private:
  Napi::FunctionReference callback_;
};

std::map<std::string, std::shared_ptr<CallbackHolder>> callbackMap;

Napi::Value SaveCallback(const Napi::CallbackInfo& info) {
  Napi::Env env = info.Env();
  if (info.Length() < 2 || !info[0].IsString() || !info[1].IsFunction()) {
    Napi::TypeError::New(env, "Invalid arguments").ThrowAsJavaScriptException();
    return env.Undefined();
  }

  std::string callbackName = info[0].As<Napi::String>().Utf8Value();
  Napi::Function callback = info[1].As<Napi::Function>();

  callbackMap[callbackName] = std::make_shared<CallbackHolder>(env, callback);

  return env.Undefined();
}

Napi::Value CallSavedCallback(const Napi::CallbackInfo& info) {
  Napi::Env env = info.Env();
  if (info.Length() < 1 || !info[0].IsString()) {
    Napi::TypeError::New(env, "Invalid arguments").ThrowAsJavaScriptException();
    return env.Undefined();
  }

  std::string callbackName = info[0].As<Napi::String>().Utf8Value();

  auto it = callbackMap.find(callbackName);
  if (it != callbackMap.end()) {
    it->second->CallCallback();
  }

  return env.Undefined();
}

Napi::Object Init(Napi::Env env, Napi::Object exports) {
  exports.Set(Napi::String::New(env, "saveCallback"), Napi::Function::New(env, SaveCallback));
  exports.Set(Napi::String::New(env, "callSavedCallback"), Napi::Function::New(env, CallSavedCallback));
  return exports;
}

NODE_API_MODULE(addon, Init)

const addon = require('addon');

addon.saveCallback('myCallback', () => {
  console.log('Saved callback called');
});

addon.callSavedCallback('myCallback'); // 输出：Saved callback called