When you are working with the github/github codebase, you can link Primer CSS modules with your local development environment using the Primerize script. This will allow you to make changes to Primer CSS and see them reflected on github.localhost without the overhead of pulling in alpha releases of a package.
Working with github/github on the latest codebase.
The github/github folder and the primer/primer folder must share the same parent folder.
Linking to your local Primer CSS repository
In your terminal start the server with the environment variable LOCAL_PRIMER=1. For example.
> LOCAL_PRIMER=1 script/server
When the variable is present, the script will check for linked local Primer CSS packages. If it's not linked, then it will proceed to link the Primer CSS packages in ../primer to your GitHub application. When the server starts with successfully linked packages, you will see a clear message.