// Here, Dog is a subclass of Animal, so it's allowed to assign a Dog object to an Animal variable. let animal: Animal = getDog(); // Valid: Dog is a subclass of Animal //When you only care about ...

Starting in version 5.5 we have shipped "pipeable operators", which can be accessed in rxjs/operators (notice the pluralized "operators"). Problems with the patched operators for dot-chaining are: Any ...