Function weakCallback

test/cpp/weak2.cpp:15–24

static AsyncResource* async_resource;
static Persistent<v8::Function> cb;
void weakCallback(
    const WeakCallbackInfo<int> &data) {  // NOLINT(runtime/references)
  HandleScope scope;
  int *parameter = static_cast<int*>(data.GetInternalField(0));
  v8::Local<v8::Value> val = New(*parameter);
  async_resource->runInAsyncScope(
      GetCurrentContext()->Global(), New(cb), 1, &val);
  delete async_resource;
  delete parameter;
}

v8::Local<v8::String> wrap() {
  EscapableHandleScope scope;