css/MIGRATING.md

12.0.0

The v12 release marks a major transition from small, single-purpose npm packages (primer-core, primer-marketing, primer-utilities, etc.) to a single package — @primer/css — which contains all of the SCSS source files in subdirectories. Here's what you need to do to migrate different parts of your app:

npm

First, install the new package.

npm install --save @primer/css

If you use the primer package, all you'll need to do is:

npm uninstall --save primer

If you use other packages, such as primer-utilities, you will need to uninstall each one by name or use a command line tool like jq to list them:

jq -r '.dependencies | keys[] | select(.|startswith("primer"))' package.json

And, if you're feeling saucy, uninstall them all by piping that to xargs npm uninstall. ✨

Sass

There are a couple of things you'll need to change in your Sass setup when migrating to v12. This section is intentionally vague because environments vary wildly between text editors, Sass implementations, and application frameworks. When in doubt, consult the relevant documentation, and feel free to file an issue if you think that we can help.

Sass imports

Generally speaking, all of your Sass @import statements can be migrated with the following search-and-replace operations, in the following order:

• If you import primer/index.scss or primer, just replace primer with @primer/css and you're done!
• Otherwise...
  1. Replace primer-marketing- with @primer/css/marketing/, e.g.
     • primer-marketing-buttons/index.scss becomes @primer/css/marketing/buttons/index.scss
     • primer-marketing-utilities/index.scss becomes @primer/css/marketing/utilities/index.scss
  2. Replace primer- with @primer/css/, e.g.
     • primer-markdown/index.scss becomes @primer/css/markdown/index.scss
     • primer-utilities/index.scss becomes @primer/css/utilities/index.scss
  3. Delete lib/ from every Primer CSS path, e.g.
     • primer-forms/lib/form-control.scss becomes @primer/css/forms/form-control.scss
     • primer-navigation/lib/subnav.scss becomes @primer/css/navigation/subnav.scss

If your text editor supports search and replace regular expressions, the following patterns should work:

find	replace
primer-marketing-(\w+)(\/lib)?	@primer/css/marketing/$1
primer-(\w+)(\/lib)?	@primer/css/$1
primer\b	@primer/css

primer-migrate

You can also use the included primer-migrate script:

npx -p @primer/css primer-migrate path/to/**/*.scss

Sass include paths

If you've installed Primer CSS with npm, you very likely already have node_modules listed in your Sass includePaths option, and you won't need to change anything. 🎉

If you've installed Primer CSS with something other than npm, or you don't know how it was installed, consult the documentation for your setup first, then let us know if you still can't figure it out.

Compiled CSS files

The compiled CSS files can be found under /dist in case you want to directly link to them.

Fonts

The marketing-specific font files published in the fonts directory of primer-marketing-support@2.0.0 are published in the fonts directory of @primer/css. If you use these fonts, you'll need to do the following:

1. Update any scripts that copy the .woff font files from node_modules/primer-marketing-support/fonts into your application to look for them in node_modules/@primer/css/fonts.
2. Update any webpack (or other bundler) resolution rules that look for fonts in primer-marketing-support/fonts to look for them in @primer/css/fonts.
3. Customize the $marketing-font-path variable to match the path from which they're served.