npmpackage.info

Gathering detailed insights and metrics for sass

sass

The reference implementation of Sass, written in Dart.

1.81.0

3,978

MIT

Dart

660.08 kB

2,055,209,044 4.9

Installations

npm install sass

Pull Requests

Open

9

Total

1,279

Closed

76

Merged

1,194

Issues

Open

65

Total

1,128

Closed

1,063

Releases

276

Dart Sass 1.81.0

1.81.0

Published on 15 Nov 2024

Dart Sass 1.80.7

1.80.7

Published on 12 Nov 2024

Dart Sass 1.80.6

1.80.6

Published on 01 Nov 2024

Dart Sass 1.80.5

1.80.5

Published on 29 Oct 2024

Dart Sass 1.80.4

1.80.4

Published on 23 Oct 2024

Dart Sass 1.80.3

1.80.3

Published on 18 Oct 2024

View all 276 releases

Developer

sass

Developer Guide

BETA

Module System

CommonJS, ESM

Min. Node Version

>=14.0.0

Typescript Support

Yes

Node Version

22.10.0

NPM Version

10.9.0 Statistics

3,978 Stars

2,586 Commits

357 Forks

74 Watching

30 Branches

75 Contributors

Updated on 28 Nov 2024

Bundle Size

2.97 MB

Minified

660.08 kB

Minified + Gzipped

Bundlephobia

Languages

Dart (84.87%)

TypeScript (15%)

JavaScript (0.11%)

HTML (0.02%)

Shell (0.01%)

Total Downloads

Cumulative downloads

Total Downloads

2,055,209,044

Last day

-6.2%

2,744,920

Compared to previous day

Last week

0.1%

15,147,188

Compared to previous week

Last month

64,964,601

Compared to previous month

Last year

16.1%

693,295,556

Compared to previous year

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

chokidar immutable source-map-js

Optional Dependencies

@parcel/watcher

Versions

A Dart implementation of Sass. Sass makes CSS fun.

Using Dart Sass
Why Dart?
Compatibility Policy
Embedded Dart Sass
- Usage
Behavioral Differences from Ruby Sass

Using Dart Sass

There are a few different ways to install and run Dart Sass, depending on your environment and your needs.

From Chocolatey or Scoop (Windows)

If you use the Chocolatey package manager or the Scoop package manager for Windows, you can install Dart Sass by running

1choco install sass

1scoop install sass

That'll give you a sass executable on your command line that will run Dart Sass. See the CLI docs for details.

From Homebrew (macOS or Linux)

If you use the Homebrew package manager, you can install Dart Sass by running

1brew install sass/sass/sass

That'll give you a sass executable on your command line that will run Dart Sass.

Standalone

You can download the standalone Dart Sass archive for your operating system—containing the Dart VM and the snapshot of the executable—from the GitHub release page. Extract it, add the directory to your path, restart your terminal, and the sass executable is ready to run!

From npm

Dart Sass is available, compiled to JavaScript, as an npm package. You can install it globally using npm install -g sass which will provide access to the sass executable. You can also add it to your project using npm install --save-dev sass. This provides the executable as well as a library:

1const sass = require('sass');
2
3const result = sass.compile(scssFilename);
4
5// OR
6
7// Note that `compileAsync()` is substantially slower than `compile()`.
8const result = await sass.compileAsync(scssFilename);

See the Sass website for full API documentation.

Dart Sass in the Browser

The sass npm package can also be run directly in the browser. It's compatible with all major web bundlers as long as you disable renaming (such as --keep-names in esbuild). You can also import it directly from a browser as an ECMAScript Module without any bundling (assuming node_modules is served as well):

1<script type="importmap">
2  {
3    "imports": {
4      "immutable": "./node_modules/immutable/dist/immutable.es.js",
5      "sass": "./node_modules/sass/sass.default.js"
6    }
7  }
8</script>
9
10<!-- Support browsers like Safari 16.3 without import maps support. -->
11<script async src="https://unpkg.com/es-module-shims@^1.7.0" crossorigin="anonymous"></script>
12
13<script type="module">
14  import * as sass from 'sass';
15
16  console.log(sass.compileString(`
17    .box {
18      width: 10px + 15px;
19    }
20  `));
21</script>

Or from a CDN:

1<script type="importmap">
2  {
3    "imports": {
4      "immutable": "https://unpkg.com/immutable@^4.0.0",
5      "sass": "https://unpkg.com/sass@^1.63.0/sass.default.js"
6    }
7  }
8</script>
9
10<!-- Support browsers like Safari 16.3 without import maps support. -->
11<script async src="https://unpkg.com/es-module-shims@^1.7.0" crossorigin="anonymous"></script>
12
13<script type="module">
14  import * as sass from 'sass';
15
16  console.log(sass.compileString(`
17    .box {
18      width: 10px + 15px;
19    }
20  `));
21</script>

Or even bundled with all its dependencies:

1<script type="module">
2  import * as sass from 'https://jspm.dev/sass';
3
4  console.log(sass.compileString(`
5    .box {
6      width: 10px + 15px;
7    }
8  `));
9</script>

Since the browser doesn't have access to the filesystem, the compile() and compileAsync() functions aren't available for it. If you want to load other files, you'll need to pass a custom importer to compileString() or compileStringAsync(). The legacy API is also not supported in the browser.

Legacy JavaScript API

Dart Sass also supports an older JavaScript API that's fully compatible with Node Sass (with a few exceptions listed below), with support for both the render() and renderSync() functions. This API is considered deprecated and will be removed in Dart Sass 2.0.0, so it should be avoided in new projects.

Sass's support for the legacy JavaScript API has the following limitations:

Only the "expanded" and "compressed" values of outputStyle are supported.
Dart Sass doesn't support the precision option. Dart Sass defaults to a sufficiently high precision for all existing browsers, and making this customizable would make the code substantially less efficient.
Dart Sass doesn't support the sourceComments option. Source maps are the recommended way of locating the origin of generated selectors.

Using Sass with Jest

If you're using Jest to run your tests, be aware that it has a longstanding bug where its default test environment breaks JavaScript's built-in instanceof operator. Dart Sass's JS package uses instanceof fairly heavily, so in order to avoid breaking Sass you'll need to install jest-environment-node-single-context and add testEnvironment: 'jest-environment-node-single-context' to your Jest config.

From Pub

If you're a Dart user, you can install Dart Sass globally using pub global activate sass, which will provide a sass executable. You can also add it to your pubspec and use it as a library. We strongly recommend importing it with the prefix sass:

1import 'package:sass/sass.dart' as sass;
2
3void main(List<String> args) {
4  print(sass.compile(args.first));
5}

See the Dart API docs for details.

`sass_api` Package

Dart users also have access to more in-depth APIs via the sass_api package. This provides access to the Sass AST and APIs for resolving Sass loads without running a full compilation. It's separated out into its own package so that it can increase its version number independently of the main sass package.

From Source

Assuming you've already checked out this repository:

Install Dart. If you download an archive manually rather than using an installer, make sure the SDK's bin directory is on your PATH.
Install Buf. This is used to build the protocol buffers for the embedded compiler.
In this repository, run dart pub get. This will install Dart Sass's dependencies.
Run dart run grinder protobuf. This will download and build the embedded protocol definition.
Run dart bin/sass.dart path/to/file.scss.

That's it!

In Docker

You can install and run Dart Sass within Docker using the following Dockerfile commands:

1# Dart stage
2FROM bufbuild/buf AS buf
3FROM dart:stable AS dart
4
5# Add your scss files
6COPY --from=another_stage /app /app
7
8# Include Protocol Buffer binary
9COPY --from=buf /usr/local/bin/buf /usr/local/bin/
10
11WORKDIR /dart-sass
12RUN git clone https://github.com/sass/dart-sass.git . && \
13  dart pub get && \
14  dart run grinder protobuf
15# This is where you run sass.dart on your scss file(s)
16RUN dart ./bin/sass.dart /app/sass/example.scss /app/public/css/example.css

Why Dart?

Dart Sass has replaced Ruby Sass as the canonical implementation of the Sass language. We chose Dart because it presented a number of advantages:

It's fast. The Dart VM is highly optimized, and getting faster all the time (for the latest performance numbers, see perf.md). It's much faster than Ruby, and close to par with C++.
It's portable. The Dart VM has no external dependencies and can compile applications into standalone snapshot files, so we can distribute Dart Sass as only three files (the VM, the snapshot, and a wrapper script). Dart can also be compiled to JavaScript, which makes it easy to distribute Sass through npm, which the majority of our users use already.
It's easy to write. Dart is a higher-level language than C++, which means it doesn't require lots of hassle with memory management and build systems. It's also statically typed, which makes it easier to confidently make large refactors than with Ruby.
It's friendlier to contributors. Dart is substantially easier to learn than Ruby, and many Sass users in Google in particular are already familiar with it. More contributors translates to faster, more consistent development.

Compatibility Policy

For the most part, Dart Sass follows semantic versioning. We consider all of the following to be part of the versioned API:

The Sass language semantics implemented by Dart Sass.
The Dart API.
The JavaScript API.
The command-line interface.

Because Dart Sass has a single version that's shared across the Dart, JavaScript, and standalone distributions, this may mean that we increment the major version number when there are in fact no breaking changes for one or more distributions. However, we will attempt to limit the number of breaking changes we make and group them in as few releases as possible to minimize churn. We strongly encourage users to use the changelog for a full understanding of all the changes in each release.

There is one exception where breaking changes may be made outside of a major version revision. It is occasionally the case that CSS adds a feature that's incompatible with existing Sass syntax in some way. Because Sass is committed to full CSS compatibility, we occasionally need to break compatibility with old Sass code in order to remain compatible with CSS.

In these cases, we will first release a version of Sass that emits deprecation warnings for any stylesheets whose behavior will change. Then, at least three months after the release of a version with these deprecation warnings, we will release a minor version with the breaking change to the Sass language semantics.

Browser Compatibility

In general, we consider any change to Dart Sass's CSS output that would cause that CSS to stop working in a real browser to be a breaking change. However, there are some cases where such a change would have substantial benefits and would only negatively affect a small minority of rarely-used browsers. We don't want to have to block such a change on a major version release.

As such, if a change would break compatibility with less than 2% of the global market share of browser according to StatCounter GlobalStats, we may release a minor version of Dart Sass with that change.

Node.js Compatibility

We consider dropping support for a given version of Node.js to be a breaking change as long as that version is still supported by Node.js. This means that releases listed as Current, Active LTS, or Maintenance LTS according to the Node.js release page. Once a Node.js version is out of LTS, Dart Sass considers itself free to break support if necessary.

Invalid CSS

Changes to the behavior of Sass stylesheets that produce invalid CSS output are not considered breaking changes. Such changes are almost always necessary when adding support for new CSS features, and delaying all such features until a new major version would be unduly burdensome for most users.

For example, when Sass began parsing calc() expressions, the invalid expression calc(1 +) became a Sass error where before it was passed through as-is. This was not considered a breaking change, because calc(1 +) was never valid CSS to begin with.

Embedded Dart Sass

Dart Sass includes an implementation of the compiler side of the Embedded Sass protocol. It's designed to be embedded in a host language, which then exposes an API for users to invoke Sass and define custom functions and importers.

Usage

sass --embedded starts the embedded compiler and listens on stdin.
sass --embedded --version prints versionResponse with id = 0 in JSON and exits.

The --embedded command-line flag is not available when you install Dart Sass as an npm package. No other command-line flags are supported with --embedded.

Behavioral Differences from Ruby Sass

There are a few intentional behavioral differences between Dart Sass and Ruby Sass. These are generally places where Ruby Sass has an undesired behavior, and it's substantially easier to implement the correct behavior than it would be to implement compatible behavior. These should all have tracking bugs against Ruby Sass to update the reference behavior.

@extend only accepts simple selectors, as does the second argument of selector-extend(). See issue 1599.
Subject selectors are not supported. See issue 1126.
Pseudo selector arguments are parsed as <declaration-value>s rather than having a more limited custom parsing. See issue 2120.
The numeric precision is set to 10. See issue 1122.
The indented syntax parser is more flexible: it doesn't require consistent indentation across the whole document. See issue 2176.
Colors do not support channel-by-channel arithmetic. See issue 2144.
Unitless numbers aren't == to unit numbers with the same value. In addition, map keys follow the same logic as ==-equality. See issue 1496.
rgba() and hsla() alpha values with percentage units are interpreted as percentages. Other units are forbidden. See issue 1525.
Too many variable arguments passed to a function is an error. See issue 1408.
Allow @extend to reach outside a media query if there's an identical @extend defined outside that query. This isn't tracked explicitly, because it'll be irrelevant when issue 1050 is fixed.
Some selector pseudos containing placeholder selectors will be compiled where they wouldn't be in Ruby Sass. This better matches the semantics of the selectors in question, and is more efficient. See issue 2228.
The old-style :property value syntax is not supported in the indented syntax. See issue 2245.
The reference combinator is not supported. See issue 303.
Universal selector unification is symmetrical. See issue 2247.
@extend doesn't produce an error if it matches but fails to unify. See issue 2250.
Dart Sass currently only supports UTF-8 documents. We'd like to support more, but Dart currently doesn't support them. See dart-lang/sdk#11744, for example.

Disclaimer: this is not an official Google product.

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

Reason

dependency not pinned by hash detected -- score normalized to 0

Details

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Info: 0 out of 36 GitHub-owned GitHubAction dependencies pinned
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Info: 0 out of 7 npmCommand dependencies pinned

0

Fuzzing

Determines if the project uses fuzzing.

0

Branch-Protection

Determines if the default and release branches are protected with GitHub's branch protection settings.

0

Signed-Releases

Determines if the project cryptographically signs release artifacts.

0

SAST

Determines if the project uses static code analysis.

Score

4.9

/10

Last Scanned on 2024-11-18

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.

Learn More

sass

Installations

Pull Requests

9

1,279

76

1,194

Issues

65

1,128

1,063

Releases

Developer

Developer Guide

CommonJS, ESM

>=14.0.0

Yes

22.10.0

10.9.0

Statistics

Bundle Size

2.97 MB

660.08 kB

Languages

Total Downloads

2,055,209,044

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

Optional Dependencies

Using Dart Sass

From Chocolatey or Scoop (Windows)

From Homebrew (macOS or Linux)

Standalone

From npm

Dart Sass in the Browser

Legacy JavaScript API

Using Sass with Jest

From Pub

sass_api Package

From Source

In Docker

Why Dart?

Compatibility Policy

Browser Compatibility

Node.js Compatibility

Invalid CSS

Embedded Dart Sass

Usage

Behavioral Differences from Ruby Sass

10

10

10

10

10

10

0

0

0

0

0

0

0

0

4.9

/10

`sass_api` Package