Confused with the steps

[alejandro-rios]

Hello, I'm trying to add the revenueCat library but I don't understand the steps from the pub dev readme:

The first step says Create a file in typings/lib/d/PACKAGE.dart, but in the example you see:

Is this another route that I need to add or just a typo?, I also have the feeling that some step is missing to get the npm package before running the app, or this happens automatically?

And also, at the end of the info there's a Currently available packages list, does this means that the library only support those?