Packages/tools doesn't exist

I just followed the installation guide here using npm:

I got a folder named node_modules with a lot of folders inside.

Then I follow the guide here:

I moved into the folder: /node_modules/@cornerstonejs/core

And from there I did run yarn install.

And then cd packages/tools

But I can’t find any folder named packages. Where is that packages folder?

How do I install and start using cornerstone?

I tried to run yarn run example tutorial inside the folder /node_modules/@cornerstonejs/tools, but it doesn’t work here too.

What are you trying to achieve? running the examples locally? (then you need to clone the repo and you see the packages), or using cornerstone packages? (then you can follow the instructions)