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Node-sass is a library that provides binding for Node.js to libsass, the C version of the popular stylesheet preprocessor, Sass.
It allows you to natively compile .scss files to css at incredible speed and automatically via a connect middleware.
Find it on npm: https://npmjs.org/package/node-sass
Follow @nodesass on twitter for release updates: https://twitter.com/nodesass
npm install node-sass
Some users have reported issues installing on Ubuntu due to node
being registered to another package. Follow the official NodeJS docs to install NodeJS so that #!/usr/bin/env node
correctly resolved.
Compiling versions 0.9.4 and above on Windows machines requires Visual Studio 2013 WD. If you have multiple VS versions, use npm install
with the --msvs_version=2013
flag also use this flag when rebuilding the module with node-gyp or nw-gyp.
Having installation troubles? Check out our Troubleshooting guide.
var sass = require('node-sass');
sass.render({
file: scss_filename,
[, options..]
}, function(err, result) { /*...*/ });
// OR
var result = sass.renderSync({
data: scss_content
[, options..]
});
Type: String
Default: null
Special: file
or data
must be specified
Path to a file for libsass to render.
Type: String
Default: null
Special: file
or data
must be specified
A string to pass to libsass to render. It is recommended that you use includePaths
in conjunction with this so that libsass can find files when using the @import
directive.
This is an experimental Libsass feature. Use with caution.
Type: Function | Function[]
signature function(url, prev, done)
Default: undefined
Function Parameters and Information:
url (String)
- the path in import as-is, which libsass encounteredprev (String)
- the previously resolved pathdone (Function)
- a callback function to invoke on async completion, takes an object literal containingfile (String)
- an alternate path for libsass to use ORcontents (String)
- the imported contents (for example, read from memory or the file system)
Handles when libsass encounters the @import
directive. A custom importer allows extension of the libsass engine in both a synchronous and asynchronous manner. In both cases, the goal is to either return
or call done()
with an object literal. Depending on the value of the object literal, one of two things will happen.
When returning or calling done()
with { file: "String" }
, the new file path will be assumed for the @import
. It's recommended to be mindful of the value of prev
in instances where relative path resolution may be required.
When returning or calling done()
with { contents: "String" }
, the string value will be used as if the file was read in through an external source.
Starting from v3.0.0:
-
this
refers to a contextual scope for the immediate run ofsass.render
orsass.renderSync
-
importers can return error and LibSass will emit that error in repsonse. For instance:
done(new Error('doesn\'t exist!')); // or return synchornously return new Error('nothing to do here');
-
importer can be an array of functions, which will be called by libsass in the order of their occurance in array. This helps user specify special importer for particular kind of path (filesystem, http). If an importer does not want to handle a particular path, it should return
sass.NULL
. See functions section for more details on Sass types.
This is an experimental Libsass feature. Use with caution.
functions
is an Object
that holds a collection of custom functions that may be invoked by the sass files being compiled. They may take zero or more input parameters and must return a value either synchronously (return ...;
) or asynchronously (done();
). Those parameters will be instances of one of the constructors contained in the require('node-sass').types
hash. The return value must be of one of these types as well. See the list of available types below:
getValue()
/setValue(value)
: gets / sets the numerical portion of the numbergetUnit()
/setUnit(unit)
: gets / sets the unit portion of the number
getValue()
/setValue(value)
: gets / sets the enclosed string
getR()
/setR(value)
: red component (integer from0
to255
)getG()
/setG(value)
: green component (integer from0
to255
)getB()
/setB(value)
: blue component (integer from0
to255
)getA()
/setA(value)
: alpha component (number from0
to1.0
)
Example:
var Color = require('node-sass').types.Color,
c1 = new Color(255, 0, 0),
c2 = new Color(0xff0088cc);
getValue()
: gets the enclosed booleantypes.Boolean.TRUE
: Singleton instance oftypes.Boolean
that holds "true"types.Boolean.FALSE
: Singleton instance oftypes.Boolean
that holds "false"
getValue(index)
/setValue(index, value)
:value
must itself be an instance of one of the constructors insass.types
.getSeparator()
/setSeparator(isComma)
: whether to use commas as a separatorgetLength()
getKey(index)
/setKey(index, value)
getValue(index)
/setValue(index, value)
getLength()
types.Null.NULL
: Singleton instance oftypes.Null
.
sass.renderSync({
data: '#{headings(2,5)} { color: #08c; }',
functions: {
'headings($from: 0, $to: 6)': function(from, to) {
var i, f = from.getValue(), t = to.getValue(),
list = new sass.types.List(t - f + 1);
for (i = f; i <= t; i++) {
list.setValue(i - f, new sass.types.String('h' + i));
}
return list;
}
}
});
Type: Array<String>
Default: []
An array of paths that libsass can look in to attempt to resolve your @import
declarations. When using data
, it is recommended that you use this.
Type: Boolean
Default: false
true
values enable Sass Indented Syntax for parsing the data string or file.
Type: String
Default: space
Used to determine whether to use space or tab character for indentation.
Type: Number
Default: 2
Maximum: 10
Used to determine the number of spaces or tabs to be used for indentation.
Type: String
Default: lf
Used to determine whether to use cr
, crlf
, lf
or lfcr
sequence for line break.
Type: Boolean
Default: false
Special: When using this, you should also specify outFile
to avoid unexpected behavior.
true
values disable the inclusion of source map information in the output file.
Type: String | null
Default: null
Special: Required when sourceMap
is a truthy value
Specify the intended location of the output file. Strongly recommended when outputting source maps so that they can properly refer back to their intended files.
Type: String
Default: nested
Values: nested
, expanded
, compact
, compressed
Determines the output format of the final CSS style.
Type: Integer
Default: 5
Used to determine how many digits after the decimal will be allowed. For instance, if you had a decimal number of 1.23456789
and a precision of 5
, the result will be 1.23457
in the final CSS.
Type: Boolean
Default: false
true
enables additional debugging information in the output file as CSS comments
Type: Boolean | String | undefined
Default: undefined
Special: Setting the sourceMap
option requires also setting the outFile
option
Enables the outputting of a source map during render
and renderSync
. When sourceMap === true
, the value of outFile
is used as the target output location for the source map. When typeof sourceMap === "String"
, the value of sourceMap
will be used as the writing location for the file.
Type: Boolean
Default: false
true
includes the contents
in the source map information
Type: Boolean
Default: false
true
embeds the source map as a data URI
Type: String
Default: undefined
the value will be emitted as sourceRoot
in the source map information
node-sass supports standard node style asynchronous callbacks with the signature of function(err, result)
. In error conditions, the error
argument is populated with the error object. In success conditions, the result
object is populated with an object describing the result of the render call.
message
(String) - The error message.line
(Number) - The line number of error.column
(Number) - The column number of error.status
(Number) - The status code.file
(String) - The filename of error. In casefile
option was not set (in favour ofdata
), this will reflect the valuestdin
.
css
(Buffer) - The compiled CSS. Write this to a file, or serve it out as needed.map
(Buffer) - The source mapstats
(Object) - An object containing information about the compile. It contains the following keys:entry
(String) - The path to the scss file, ordata
if the source was not a filestart
(Number) - Date.now() before the compilationend
(Number) - Date.now() after the compilationduration
(Number) - end - startincludedFiles
(Array) - Absolute paths to all related scss files in no particular order.
var sass = require('node-sass');
sass.render({
file: '/path/to/myFile.scss',
data: 'body{background:blue; a{color:black;}}',
importer: function(url, prev, done) {
// url is the path in import as is, which libsass encountered.
// prev is the previously resolved path.
// done is an optional callback, either consume it or return value synchronously.
// this.options contains this options hash, this.callback contains the node-style callback
someAsyncFunction(url, prev, function(result){
done({
file: result.path, // only one of them is required, see section Sepcial Behaviours.
contents: result.data
});
});
// OR
var result = someSyncFunction(url, prev);
return {file: result.path, contents: result.data};
},
includePaths: [ 'lib/', 'mod/' ],
outputStyle: 'compressed'
}, function(error, result) { // node-style callback from v3.0.0 onwards
if (error) {
console.log(error.status); // used to be "code" in v2x and below
console.log(error.column);
console.log(error.message);
console.log(error.line);
}
else {
console.log(result.css.toString());
console.log(result.stats);
console.log(result.map.toString());
// or better
console.log(JSON.stringify(result.map)); // note, JSON.stringify accepts Buffer too
}
});
// OR
var result = sass.renderSync({
file: '/path/to/file.scss',
data: 'body{background:blue; a{color:black;}}',
outputStyle: 'compressed',
outFile: '/to/my/output.css',
sourceMap: true, // or an absolute or relative (to outFile) path
importer: function(url, prev, done) {
// url is the path in import as is, which libsass encountered.
// prev is the previously resolved path.
// done is an optional callback, either consume it or return value synchronously.
// this.options contains this options hash
someAsyncFunction(url, prev, function(result){
done({
file: result.path, // only one of them is required, see section Sepcial Behaviours.
contents: result.data
});
});
// OR
var result = someSyncFunction(url, prev);
return {file: result.path, contents: result.data};
},
}));
console.log(result.css);
console.log(result.map);
console.log(result.stats);
- In the case that both
file
anddata
options are set, node-sass will give precedence todata
and usefile
to calculate paths in sourcemaps.
Both node-sass
and libsass
version info is now exposed via the info
method:
var sass = require('node-sass');
console.log(sass.info);
/*
it will output something like:
node-sass 2.0.1 (Wrapper) [JavaScript]
libsass 3.1.0 (Sass Compiler) [C/C++]
*/
Since node-sass >=v3.0.0 libsass version is determined at run time.
Listing of community uses of node-sass in build tools and frameworks.
@jasonsanjose has created a Brackets extension based on node-sass: https://github.com/jasonsanjose/brackets-sass. When editing Sass files, the extension compiles changes on save. The extension also integrates with Live Preview to show Sass changes in the browser without saving or compiling.
Brunch's official sass plugin uses node-sass by default, and automatically falls back to ruby if use of Compass is detected: https://github.com/brunch/sass-brunch
Recompile .scss
files automatically for connect and express based http servers.
This functionality has been moved to node-sass-middleware
in node-sass v1.0.0
@jking90 wrote a DocPad plugin that compiles .scss
files using node-sass: https://github.com/jking90/docpad-plugin-nodesass
@stephenway has created an extension that transpiles Sass to CSS using node-sass with duo.js https://github.com/duojs/sass
@sindresorhus has created a set of grunt tasks based on node-sass: https://github.com/sindresorhus/grunt-sass
@dlmanning has created a gulp sass plugin based on node-sass: https://github.com/dlmanning/gulp-sass
@sintaxiโs Harp web server implicitly compiles .scss
files using node-sass: https://github.com/sintaxi/harp
@stevenschobert has created a metalsmith plugin based on node-sass: https://github.com/stevenschobert/metalsmith-sass
@fourseven has created a meteor plugin based on node-sass: https://github.com/fourseven/meteor-scss
@dbashford has created a Mimosa module for sass which includes node-sass: https://github.com/dbashford/mimosa-sass
There is also an example connect app here: https://github.com/andrew/node-sass-example
Node-sass includes pre-compiled binaries for popular platforms, to add a binary for your platform follow these steps:
Check out the project:
git clone --recursive https://github.com/sass/node-sass.git
cd node-sass
git submodule update --init --recursive
npm install
node scripts/build -f # use -d switch for debug release
# if succeeded, it will generate and move
# the binary in vendor directory.
The interface for command-line usage is fairly simplistic at this stage, as seen in the following usage section.
Output will be saved with the same name as input SASS file into the current working directory if it's omitted.
node-sass [options] <input.scss> [output.css]
cat <input.scss> | node-sass > output.css
Options:
-w, --watch Watch a directory or file
-r, --recursive Recursively watch directories or files
-o, --output Output directory
-x, --omit-source-map-url Omit source map URL comment from output
-i, --indented-syntax Treat data from stdin as sass code (versus scss)
-q, --quiet Suppress log output except on error
-v, --version Prints version info
--output-style CSS output style (nested | expanded | compact | compressed)
--indent-type Indent type for output CSS (space | tab)
--indent-width Indent width; number of spaces or tabs (maximum value: 10)
--linefeed Linefeed style (cr | crlf | lf | lfcr)
--source-comments Include debug info in output
--source-map Emit source map
--source-map-contents Embed include contents in map
--source-map-embed Embed sourceMappingUrl as data URI
--source-map-root Base path, will be emitted in source-map as is
--include-path Path to look for imported files
--precision The amount of precision allowed in decimal numbers
--importer Path to .js file containing custom importer
--functions Path to .js file containing custom functions
--help Print usage info
Pass a directory as the input to compile multiple files. For example: node-sass sass/ -o css/
. The --output
flag is required and must be a directory when using multi-file compilation.
Also, note --importer
takes the (absolute or relative to pwd) path to a js file, which needs to have a default module.exports
set to the importer function. See our test fixtures for example.
The source-map option accepts true
as value, in which case it replaces destination extension with .css.map
. It also accepts path to .map
file and even path to the desired directory. In case of multi-file compilation path to .map
yields error.
Install runs only two Mocha tests to see if your machine can use the pre-built libsass which will save some time during install. If any tests fail it will build from source.
This module is brought to you and maintained by the following people:
- Michael Mifsud - Project Lead (Github / Twitter)
- Andrew Nesbitt (Github / Twitter)
- Dean Mao (Github / Twitter)
- Brett Wilkins (Github / Twitter)
- Keith Cirkel (Github / Twitter)
- Laurent Goderre (Github / Twitter)
- Nick Schonning (Github / Twitter)
- Adam Yeats (Github / Twitter)
- Adeel Mujahid (Github / Twitter)
We <3 our contributors! A special thanks to all those who have clocked in some dev time on this project, we really appreciate your hard work. You can find a full list of those people here.
- Fork the project.
- Make your feature addition or bug fix.
- Add documentation if necessary.
- Add tests for it. This is important so I don't break it in a future version unintentionally.
- Send a pull request. Bonus points for topic branches.
Copyright (c) 2015 Andrew Nesbitt. See LICENSE for details.