Reading the source code and finding different functions that can be called from the js code, for example new TCP, it is not entirely clear how the C++ level accepts arguments to its level for a specific bound function.

For example, this js call is bound

new TCP(TCPConstants.SERVER)

with the following code on С++

void TCPWrap::New(const FunctionCallbackInfo<Value>& args) {
  // This constructor should not be exposed to public javascript.
  // Therefore we assert that we are not trying to call this as a
  // normal function.
  CHECK(args.IsConstructCall());
  CHECK(args[0]->IsInt32());
  Environment* env = Environment::GetCurrent(args);

  int type_value = args[0].As<Int32>()->Value();
  TCPWrap::SocketType type = static_cast<TCPWrap::SocketType>(type_value);

  ProviderType provider;
  switch (type) {
    case SOCKET:
      provider = PROVIDER_TCPWRAP;
      break;
    case SERVER:
      provider = PROVIDER_TCPSERVERWRAP;
      break;
    default:
      UNREACHABLE();
  }

  new TCPWrap(env, args.This(), provider);
}

That is, I want to understand how the C++ level const FunctionCallbackInfo<Value>& args is initialized for the bound function, thanks.