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That one builds on bookshelf: https://github.com/geoinfo-applications/bookshelf-orm
One of the core members of the NestJS team here: I agree. I see so many posts about how Mikro is light years ahead of TypeORM. I'm personally not really for ORMs in general, but I wish Kamil didn't go and create @nestjs/sequelize. I believe he created the @nestjs/typeorm package before Mikro got too much steam and popularity. There's also discussion in a PR about adding a recipe for MikroORM so that the community becomes more aware of it.
Well, for one TypeORM seems to support polymorphic relationships using this method, and while I know it's a workaround, at least it's an option.
I see, thanks! I'm actually working on implementing that in my MikroORM NestJS boilerplate which is a copy of my TypeORM version of that. I'm mostly just a little worried about production performance and stability, but at least MikroORM uses KnexJS under the hood so I have a very familiar query builder to work with if issues arise whereas TypeORM's query builder isn't that great IMHO.