async_resource.cc

// Constructor of Async resource
AsyncResource::AsyncResource(Isolate* isolate,
                             Local<Object> resource,
                             const char* name,
                             async_id trigger_async_id)
    : env_(Environment::GetCurrent(isolate)),
      resource_(isolate, resource) {
  async_context_ = EmitAsyncInit(isolate, resource, name,
                                 trigger_async_id);
}

// Destructor of Async resource
AsyncResource::~AsyncResource() {
  EmitAsyncDestroy(env_, async_context_);
  resource_.Reset();
}