Sass Blog

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Request for Comments: HWB Functions

Posted 7 October 2020 by Natalie Weizenbaum

The CSS working group has been up to all sorts of exciting stuff recently in the Color Level 4 spec, and the Sass team is starting to think about how to integrate those cool new features into Sass’s color model. We need more time to hammer out exactly the right designs for complex features like the Lab color space, but that doesn’t mean we can’t add a few new color goodies.

Today we’re announcing a proposal for one such feature: built-in Sass functions for HWB colors! Once this proposal (drafted by Sass core team member Miriam Suzanne) is accepted and implemented, you’ll be able to write colors in HWB syntax and adjust their whiteness and blackness the same way you can adjust a color’s saturation and lightness today.

The Functions permalinkThe Functions permalink The Functions permalinkThe Functions

Here are the new and improved functions this proposal adds:

color.hwb() permalinkcolor.hwb() permalink color.hwb() permalinkcolor.hwb()

The color.hwb() function defines a color using its hue, whiteness, and blackness. Like the existing rgb() and hsl() functions, It can…

Request for Comments: Nested Map Functions

Posted 16 September 2020 by Natalie Weizenbaum

As Sass libraries and design systems get more complex and have more users with different needs, they tend to develop the need to share and override configuration and design tokens. This configuration is often hierarchical, and ends up being represented as maps that contain maps that contain still more maps. Up until now, Sass’s map functions haven’t really made it easy to work with this sort of nested map structure. But that’s changing with the latest language proposal, written by Sass core team member Miriam Suzanne.

This proposal expands the existing map functions and adds a few new ones to make working with nested maps much easier than it was before. It’s based on helper functions that pop up in all sorts of Sass projects around the web, incorporating best practices back into the language itself.

The Functions permalinkThe Functions permalink The Functions permalinkThe Functions

Here are the new and improved functions this proposal adds:

map.get() and map.has-key() permalinkmap.get() and map.has-key() permalink map.get() and map.has-key() permalinkmap.get() and map.has-key()

The map.get() and…

The Module System is Launched

Posted 2 October 2019 by Natalie Weizenbaum

The Sass team has known for years that the @import rule, one of the earliest additions to Sass, wasn’t as good as we wanted it. It caused a litany of problems for our users:

  • It was next to impossible to figure out where a given variable, mixin, or function (collectively called “members”) was originally defined, since anything defined in one stylesheet was available to all stylesheets that were imported after it.

  • Even if you chose to explicitly import every stylesheet that defined members you used, you’d end up with duplicate CSS and strange side-effects, because stylesheets were reloaded from scratch every time they were imported.

  • It wasn’t safe to use terse and simple names because there was always a possibility that some other stylesheet elsewhere in your application would use the same name and mess up your logic. To be safe users had to manually add long, awkward namespaces to everything they defined.

  • Library authors had no way to ensure that their private helpers wouldn’t be accessed…

Module System Preview

Posted 4 September 2019 by Natalie Weizenbaum

Exciting news, Sass fans! After a year of development and some iteration on the spec, we’re ready to launch a beta preview of the new Sass module system! We may still make a few last-minute tweaks based on user feedback, so don’t go using itin production just yet, but please do take this opportunity to play around with it and let us know what you think.

Installing the Preview permalinkInstalling the Preview permalink Installing the Preview permalinkInstalling the Preview

The preview release is available on all the normal distribution channels as version 1.23.0-module.beta.1. You can download it from the GitHub release page, or install it using one of the following commands (depending on your preferred installation channel):

$ npm install --save-dev sass@1.23.0-module.beta.1

$ npm install -g sass@1.23.0-module.beta.1

$ brew install sass/sass/sass@1.23.0-module.beta.1

$ choco install sass --version 1.23.0.modulebeta-1

$ pub global activate sass 1.23.0-module.beta.1

Note that 1.23.0 may not actually be the final version number for the stable…

Request For Comments: Forward Slash as Separator

Posted 7 May 2019 by Natalie Weizenbaum

Early on in Sass’s history, the decision was made to use / as a division operator, since that was (and is) by far the most common representation across programming languages. The / character was used in very few plain CSS properties, and for those it was an optional shorthand. So Sass defined a set of heuristics that defined when / would be rendered as a literal slash versus treated as an operator.

For a long time, these heuristics worked pretty well. In recent years, however, new additions to CSS such as CSS Grid and CSS Color Level 4 have been using / as a separator increasingly often. Using the same character for both division and slash-separation is becoming more and more annoying to users, and will likely eventually become untenable.

As such, we’re planning to redefine / to be only a separator. Rather than creating an unquoted string (as it currently does when at least one operand isn’t a number), it will create a list with a new slash separator. For example, 1 / 2 / 3 will be…

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