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node-sass

Warning: LibSass and Node Sass are deprecated. While they will continue to receive maintenance releases indefinitely, there are no plans to add additional features or compatibility with any new CSS or Sass features. Projects that still use it should move onto Dart Sass.

Node version support policy

  1. Supported Node.js versions vary by release, please consult the releases page.
  2. Node versions that hit end of life https://github.com/nodejs/Release, will be dropped from support at each node-sass release (major, minor).
  3. We will stop building binaries for unsupported releases, testing for breakages in dependency compatibility, but we will not block installations for those that want to support themselves.
  4. New node release require minor internal changes along with support from CI providers (AppVeyor, GitHub Actions). We will open a single issue for interested parties to subscribe to, and close additional issues.

Below is a quick guide for minimum and maximum support supported version of node-sass:

NodeJS

Supported node-sass version Node Module
Node 15 5.0+ 88
Node 14 4.14+ 83
Node 13 4.13+, <5.0 79
Node 12 4.12+ 72
Node 11 4.10+, <5.0 67
Node 10 4.9+ 64
Node 8 4.5.3+, <5.0 57
Node <8 <5.0 <57

Sass logo

Alpine Linux macOS Windows x64 Linting Windows x86 Coverage Status

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://www.npmjs.com/package/node-sass

Follow @nodesass on twitter for release updates: https://twitter.com/nodesass

Install

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 resolves.

Compiling on Windows machines requires the node-gyp prerequisites.

Are you seeing the following error? Check out our Troubleshooting guide.**

SyntaxError: Use of const in strict mode.

Having installation troubles? Check out our Troubleshooting guide.

Install from mirror in China

npm install -g mirror-config-china --registry=http://registry.npm.taobao.org
npm install node-sass

Usage

var sass = require('node-sass');
sass.render({
  file: scss_filename,
  [, options..]
}, function(err, result) { /*...*/ });
// OR
var result = sass.renderSync({
  data: scss_content
  [, options..]
});

Options

file

  • Type:
    String
  • Default:
    null

Special:

file
or
data
must be specified

Path to a file for LibSass to compile.

data

  • Type:
    String
  • Default:
    null

Special:

file
or
data
must be specified

A string to pass to LibSass to compile. It is recommended that you use

includePaths
in conjunction with this so that LibSass can find files when using the
@import
directive.

importer (>= v2.0.0) - experimental

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 encountered
  • prev (String)
    - the previously resolved path
  • done (Function)
    - a callback function to invoke on async completion, takes an object literal containing
    • file (String)
      - an alternate path for LibSass to use OR
    • contents (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 of
    sass.render
    or
    sass.renderSync
  • importers can return error and LibSass will emit that error in response. For instance:

  done(new Error('doesn\'t exist!'));
  // or return synchronously
  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 occurrence 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
    null
    . See functions section for more details on Sass types.

functions (>= v3.0.0) - experimental

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:

types.Number(value [, unit = ""])

  • getValue()
    /
    setValue(value)
    : gets / sets the numerical portion of the number
  • getUnit()
    /
    setUnit(unit)
    : gets / sets the unit portion of the number

types.String(value)

  • getValue()
    /
    setValue(value)
    : gets / sets the enclosed string

types.Color(r, g, b [, a = 1.0]) or types.Color(argb)

  • getR()
    /
    setR(value)
    : red component (integer from
    0
    to
    255
    )
  • getG()
    /
    setG(value)
    : green component (integer from
    0
    to
    255
    )
  • getB()
    /
    setB(value)
    : blue component (integer from
    0
    to
    255
    )
  • getA()
    /
    setA(value)
    : alpha component (number from
    0
    to
    1.0
    )

Example:

var Color = require('node-sass').types.Color,
  c1 = new Color(255, 0, 0),
  c2 = new Color(0xff0088cc);

types.Boolean(value)

  • getValue()
    : gets the enclosed boolean
  • types.Boolean.TRUE
    : Singleton instance of
    types.Boolean
    that holds "true"
  • types.Boolean.FALSE
    : Singleton instance of
    types.Boolean
    that holds "false"

types.List(length [, commaSeparator = true])

  • getValue(index)
    /
    setValue(index, value)
    :
    value
    must itself be an instance of one of the constructors in
    sass.types
    .
  • getSeparator()
    /
    setSeparator(isComma)
    : whether to use commas as a separator
  • getLength()

types.Map(length)

  • getKey(index)
    /
    setKey(index, value)
  • getValue(index)
    /
    setValue(index, value)
  • getLength()

types.Null()

  • types.Null.NULL
    : Singleton instance of
    types.Null
    .

Example

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 &lt;= t; i++) {
    list.setValue(i - f, new sass.types.String('h' + i));
  }

  return list;
}

} });

includePaths

  • Type:
    Array
  • 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.

indentedSyntax

  • Type:
    Boolean
  • Default:
    false

true
values enable Sass Indented Syntax for parsing the data string or file.

Note: node-sass/libsass will compile a mixed library of scss and indented syntax (.sass) files with the Default setting (false) as long as .sass and .scss extensions are used in filenames.

indentType (>= v3.0.0)

  • Type:
    String
  • Default:
    space

Used to determine whether to use space or tab character for indentation.

indentWidth (>= v3.0.0)

  • Type:
    Number
  • Default:
    2
  • Maximum:
    10

Used to determine the number of spaces or tabs to be used for indentation.

linefeed (>= v3.0.0)

  • Type:
    String
  • Default:
    lf

Used to determine whether to use

cr
,
crlf
,
lf
or
lfcr
sequence for line break.

omitSourceMapUrl

  • 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.

outFile

  • 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.

Attention enabling this option will not write the file on disk for you, it's for internal reference purpose only (to generate the map for example).

Example on how to write it on the disk

sass.render({
    ...
    outFile: yourPathTotheFile,
  }, function(error, result) { // node-style callback from v3.0.0 onwards
    if(!error){
      // No errors during the compilation, write this result on the disk
      fs.writeFile(yourPathTotheFile, result.css, function(err){
        if(!err){
          //file written on disk
        }
      });
    }
  });
});

outputStyle

  • Type:
    String
  • Default:
    nested
  • Values:
    nested
    ,
    expanded
    ,
    compact
    ,
    compressed

Determines the output format of the final CSS style.

precision

  • 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.

sourceComments

  • Type:
    Boolean
  • Default:
    false

true
Enables the line number and file where a selector is defined to be emitted into the compiled CSS as a comment. Useful for debugging, especially when using imports and mixins.

sourceMap

  • Type:
    Boolean | String | undefined
  • Default:
    undefined

Enables source map generation during

render
and
renderSync
.

When

sourceMap === true
, the value of
outFile
is used as the target output location for the source map with the suffix
.map
appended. If no
outFile
is set,
sourceMap
parameter is ignored.

When

typeof sourceMap === "string"
, the value of
sourceMap
will be used as the writing location for the file.

sourceMapContents

  • Type:
    Boolean
  • Default:
    false

true
includes the
contents
in the source map information

sourceMapEmbed

  • Type:
    Boolean
  • Default:
    false

true
embeds the source map as a data URI

sourceMapRoot

  • Type:
    String
  • Default:
    undefined

the value will be emitted as

sourceRoot
in the source map information

render
Callback (>= v3.0.0)

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.

Error Object

  • 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 case
    file
    option was not set (in favour of
    data
    ), this will reflect the value
    stdin
    .

Result Object

  • css
    (Buffer) - The compiled CSS. Write this to a file, or serve it out as needed.
  • map
    (Buffer) - The source map
  • stats
    (Object) - An object containing information about the compile. It contains the following keys:
    • entry
      (String) - The path to the scss file, or
      data
      if the source was not a file
    • start
      (Number) - Date.now() before the compilation
    • end
      (Number) - Date.now() after the compilation
    • duration
      (Number) - end - start
    • includedFiles
      (Array) - Absolute paths to all related scss files in no particular order.

Examples

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 Special 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 Special 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);

Special behaviours

  • In the case that both
    file
    and
    data
    options are set, node-sass will give precedence to
    data
    and use
    file
    to calculate paths in sourcemaps.

Version information (>= v2.0.0)

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.

Integrations

Listing of community uses of node-sass in build tools and frameworks.

Brackets extension

@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 plugin

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

Connect/Express middleware

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

DocPad Plugin

@10xLaCroixDrinker wrote a DocPad plugin that compiles

.scss
files using node-sass: https://github.com/10xLaCroixDrinker/docpad-plugin-nodesass

Duo.js extension

@stephenway has created an extension that transpiles Sass to CSS using node-sass with duo.js https://github.com/duojs/sass

Grunt extension

@sindresorhus has created a set of grunt tasks based on node-sass: https://github.com/sindresorhus/grunt-sass

Gulp extension

@dlmanning has created a gulp sass plugin based on node-sass: https://github.com/dlmanning/gulp-sass

Harp

@sintaxi’s Harp web server implicitly compiles

.scss
files using node-sass: https://github.com/sintaxi/harp

Metalsmith plugin

@stevenschobert has created a metalsmith plugin based on node-sass: https://github.com/stevenschobert/metalsmith-sass

Meteor plugin

@fourseven has created a meteor plugin based on node-sass: https://github.com/fourseven/meteor-scss

Mimosa module

@dbashford has created a Mimosa module for sass which includes node-sass: https://github.com/dbashford/mimosa-sass

Example App

There is also an example connect app here: https://github.com/andrew/node-sass-example

Rebuilding binaries

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
npm install
node scripts/build -f  # use -d switch for debug release
# if succeeded, it will generate and move
# the binary in vendor directory.

Command Line Interface

The interface for command-line usage is fairly simplistic at this stage, as seen in the following usage section.

Output will be sent to stdout if the

--output
flag is omitted.

Usage

node-sass [options]  [output]
Or:
cat  | node-sass > output

Example:

node-sass src/style.scss dest/style.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
    --follow                   Follow symlinked directories
    --precision                The amount of precision allowed in decimal numbers
    --error-bell               Output a bell character on errors
    --importer                 Path to .js file containing custom importer
    --functions                Path to .js file containing custom functions
    --help                     Print usage info

The

input
can be either a single
.scss
or
.sass
, or a directory. If the input is a directory the
--output
flag must also be supplied.

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 a boolean 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. When compiling a directory
--source-map
can either be a boolean value or a directory.

Binary configuration parameters

node-sass supports different configuration parameters to change settings related to the sass binary such as binary name, binary path or alternative download path. Following parameters are supported by node-sass:

Variable name

.npmrc parameter Process argument Value
SASSBINARYNAME sassbinaryname --sass-binary-name path
SASSBINARYSITE sassbinarysite --sass-binary-site URL
SASSBINARYPATH sassbinarypath --sass-binary-path path
SASSBINARYDIR sassbinarydir --sass-binary-dir path

These parameters can be used as environment variable:

  • E.g.
    export SASS_BINARY_SITE=http://example.com/

As local or global .npmrc configuration file:

  • E.g.
    sass_binary_site=http://example.com/

As a process argument:

  • E.g.
    npm install node-sass --sass-binary-site=http://example.com/

Post-install Build

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.

Maintainers

This module is brought to you and maintained by the following people:

Contributors

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.

Note on Patches/Pull Requests

Check out our Contributing guide

Copyright

Copyright (c) 2015 Andrew Nesbitt. See LICENSE for details.

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