sfcode
An Online Competing and Development Environment
|
A pure JavaScript implementation of Sass. Sass makes CSS fun again.
![]() |
This package is a distribution of Dart Sass, compiled to pure JavaScript with no native code or external dependencies. It provides a command-line sass
executable and a Node.js API.
You can install Sass 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:
See below for details on Dart Sass's JavaScript API.
When installed via npm, Dart Sass supports a JavaScript API that's fully compatible with Node Sass (with a few exceptions listed below), with support for both the render()
and renderSync()
functions. See the Sass website for full API documentation!
Note however that by default, **renderSync()
is more than twice as fast as render()
** due to the overhead of asynchronous callbacks. To avoid this performance hit, render()
can use the fibers
package to call asynchronous importers from the synchronous code path. To enable this, pass the Fiber
class to the fiber
option:
Both render()
and renderSync()
support the following options:
data
file
functions
importer
includePaths
indentType
indentWidth
indentedSyntax
linefeed
omitSourceMapUrl
outFile
sourceMapContents
sourceMapEmbed
sourceMapRoot
sourceMap
"expanded"
and "compressed"
values of outputStyle
are supported.No support is intended for the following options:
precision
. Dart Sass defaults to a sufficiently high precision for all existing browsers, and making this customizable would make the code substantially less efficient.sourceComments
. Source maps are the recommended way of locating the origin of generated selectors.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.<declaration-value>
s rather than having a more limited custom parsing. See issue 2120.==
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.@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.:property value
syntax is not supported in the indented syntax. See issue 2245.@extend
doesn't produce an error if it matches but fails to unify. See issue 2250.Disclaimer: this is not an official Google product.