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Sass Package Importer (Request for Comments)

A new proposal for importing from NPM packages in Sass

UI libraries like Vuetify and Bootstrap make it easy to extend their themes by providing Sass source files with their NPM packages. Now, Sass is requesting feedback on a simpler way to import those libraries into your Sass styles with e.g. @use "pkg:bootstrap".

Read the summary & proposal »

Many UI libraries provide Sass source code alongside JavaScript in a Node.js package, so that users can customize package styles or themes. There hasn’t been an easy way to specify that a file to be imported is from an installed package, so build tools have provided a variety of ways to import from a package and define where packages are installed.

This has meant that switching build tools might result in unexpected gotchas, or that many more potential paths need to be checked to see if a file exists at that location.

The Node Package Importer will allow users to specify with a pkg: URL that an import is in a Node.js package installed alongside their source code.

@use "pkg:vuetify";

When a Node Package Importer is added to the importers for a compilation, this directs Sass to find a Node.js module called vuetify, and import the default Sass file defined by the vuetify package.

I’m excited by what this provides library authors – this makes it much more straightforward to expose Sass source files, and to expect that users can import those files, regardless of their setup.

It also allows library authors to take advantage of package entry points, so they can specify exactly which files are exposed, and at what paths.

For instance, an author could expose the file at ./src/sass/themes/_dark.scss in a way that would allow someone using the package to simply write @use "pkg:my_package/dark".

This also uses conditional exports, so package authors can specify a Sass default entry point that is different from their JavaScript entry point.

I look forward to this feature shipping, and making integration easier for both package authors and users.

Upcoming Workshop

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Cascading Style Systems

A workshop on resilient & maintainable CSS

New CSS features are shipping at an unprecedented rate – cascade layers, container queries, the :has() selector, subgrid, nesting, and so much more. It’s a good time to step back and understand how these tools fit together in a declarative system – a resilient cascade of styles.

Register for the October workshop »

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