What about the NestJs modules?

[AKorpusenko]

First of all thanks a lot for the great dataloader tutorial. But there is a huge problem in your code. There is only one app.module and all the code is imported there, what actually breaks the whole idea of NestJs DI and code partition.
The thing I want to see here is how to implement Author, Book and BookGenre module and service, how to add DataLoader in NestJs way. Otherwise I don't see any benefit of using Nest here 🤔