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# node-sass

**Warning:** [LibSass and Node Sass are deprecated](https://sass-lang.com/blog/libsass-is-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](https://sass-lang.com/dart-sass).

## Node version support policy

1. Supported Node.js versions vary by release, please consult the [releases page](https://github.com/sass/node-sass/releases).
1. Node versions that hit end of life <https://github.com/nodejs/Release>, will be dropped from support at each node-sass release (major, minor).
1. 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.
1. 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 supported versions of node-sass:

NodeJS | Supported node-sass version | Node Module
--------|-----------------------------|------------
Node 19 | 8.0+ | 111
Node 18 | 8.0+ | 108
Node 17 | 7.0+, <8.0 | 102
Node 16 | 6.0+ | 93
Node 15 | 5.0+, <7.0 | 88
Node 14 | 4.14+ | 83
Node 13 | 4.13+, <5.0 | 79
Node 12 | 4.12+, <8.0 | 72
Node 11 | 4.10+, <5.0 | 67
Node 10 | 4.9+, <6.0 | 64
Node 8 | 4.5.3+, <5.0 | 57
Node <8 | <5.0 | <57

![Alpine](https://github.com/sass/node-sass/workflows/Build%20bindings%20for%20Alpine%20releases/badge.svg)
![Linux](https://github.com/sass/node-sass/workflows/Build%20bindings%20for%20Linux%20releases/badge.svg)
![macOS](https://github.com/sass/node-sass/workflows/Build%20bindings%20for%20macOS%20releases/badge.svg)
![Windows x64](https://github.com/sass/node-sass/workflows/Build%20bindings%20for%20Windows%20releases/badge.svg)
![Linting](https://github.com/sass/node-sass/workflows/Lint%20JS/badge.svg)
[![Windows x86](https://ci.appveyor.com/api/projects/status/22mjbk59kvd55m9y/branch/master?svg=true)](https://ci.appveyor.com/project/sass/node-sass/branch/master)
[![Coverage Status](https://coveralls.io/repos/sass/node-sass/badge.svg?branch=master)](https://coveralls.io/r/sass/node-sass?branch=master)

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

```shell
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](https://github.com/nodesource/distributions/blob/master/README.md#debinstall) to install NodeJS so that `#!/usr/bin/env node` correctly resolves.

Compiling on Windows machines requires the [node-gyp prerequisites](https://github.com/nodejs/node-gyp#on-windows).

Are you seeing the following error? Check out our [Troubleshooting guide](https://github.com/sass/node-sass/blob/master/TROUBLESHOOTING.md#installing-node-sass-4x-with-node--4).**

```
SyntaxError: Use of const in strict mode.
```

**Having installation troubles? Check out our [Troubleshooting guide](https://github.com/sass/node-sass/blob/master/TROUBLESHOOTING.md).**

### Install from mirror in China

```shell
npm install -g mirror-config-china --registry=https://registry.npmmirror.com
npm install node-sass
```

## Usage

```javascript
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:

```javascript
 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](#functions--v300---experimental) 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:

```javascript
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

```javascript
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;
 }
 }
});
```

### includePaths

* 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.

### indentedSyntax

* Type: `Boolean`
* Default: `false`

`true` values enable [Sass Indented Syntax](https://sass-lang.com/documentation/file.INDENTED_SYNTAX.html) 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

```javascript
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

```javascript
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:

```javascript
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](https://github.com/jasonsanjose) has created a [Brackets](http://brackets.io) 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](http://brunch.io)'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`](https://github.com/sass/node-sass-middleware) in node-sass v1.0.0

### DocPad Plugin

[@10xLaCroixDrinker](https://github.com/10xLaCroixDrinker) wrote a [DocPad](http://docpad.org/) plugin that compiles `.scss` files using node-sass: <https://github.com/docpad/docpad-plugin-nodesass>

### Duo.js extension

[@stephenway](https://github.com/stephenway) has created an extension that transpiles Sass to CSS using node-sass with [duo.js](http://duojs.org/)
<https://github.com/duojs/sass>

### Grunt extension

[@sindresorhus](https://github.com/sindresorhus/) has created a set of grunt tasks based on node-sass: <https://github.com/sindresorhus/grunt-sass>

### Gulp extension

[@dlmanning](https://github.com/dlmanning/) has created a gulp sass plugin based on node-sass: <https://github.com/dlmanning/gulp-sass>

### Harp

[@sintaxi](https://github.com/sintaxi)’s Harp web server implicitly compiles `.scss` files using node-sass: <https://github.com/sintaxi/harp>

### Metalsmith plugin

[@stevenschobert](https://github.com/stevenschobert/) has created a metalsmith plugin based on node-sass: <https://github.com/stevenschobert/metalsmith-sass>

### Meteor plugin

[@fourseven](https://github.com/fourseven) has created a meteor plugin based on node-sass: <https://github.com/fourseven/meteor-scss>

### Mimosa module

[@dbashford](https://github.com/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:

```bash
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] <input> [output]`
 Or:
 `cat <input> | node-sass > output`

Example:

`node-sass src/style.scss dest/style.css`

**Options:**

```bash
 -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](https://github.com/sass/node-sass/tree/974f93e76ddd08ea850e3e663cfe64bb6a059dd3/test/fixtures/extras) 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
-------------------------|--------------------------|----------------------------|------
SASS_BINARY_NAME | sass_binary_name | --sass-binary-name | path
SASS_BINARY_SITE | sass_binary_site | --sass-binary-site | URL
SASS_BINARY_PATH | sass_binary_path | --sass-binary-path | path
SASS_BINARY_DIR | sass_binary_dir | --sass-binary-dir | path
SASS_REJECT_UNAUTHORIZED | sass_reject_unauthorized | --sass-reject-unauthorized | value

These parameters can be used as environment variable:

* E.g. `export SASS_BINARY_SITE=http://example.com/`

As local or global [.npmrc](https://docs.npmjs.com/misc/config) 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/`

If you are using self-signed certificates for your binary then `SASS_REJECT_UNAUTHORIZED` will override (rejectUnauthorized)[https://nodejs.org/docs/latest/api/tls.html#tls_tls_createserver_options_secureconnectionlistener].

## 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:

* Michael Mifsud - Project Lead ([Github](https://github.com/xzyfer) / [Twitter](https://twitter.com/xzyfer))
* Andrew Nesbitt ([Github](https://github.com/andrew) / [Twitter](https://twitter.com/teabass))
* Dean Mao ([Github](https://github.com/deanmao) / [Twitter](https://twitter.com/deanmao))
* Brett Wilkins ([Github](https://github.com/bwilkins) / [Twitter](https://twitter.com/bjmaz))
* Keith Cirkel ([Github](https://github.com/keithamus) / [Twitter](https://twitter.com/Keithamus))
* Laurent Goderre ([Github](https://github.com/laurentgoderre) / [Twitter](https://twitter.com/laurentgoderre))
* Nick Schonning ([Github](https://github.com/nschonni) / [Twitter](https://twitter.com/nschonni))
* Adeel Mujahid ([Github](https://github.com/am11) / [Twitter](https://twitter.com/adeelbm))

## 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.](https://github.com/sass/node-sass/graphs/contributors)

### Note on Patches/Pull Requests

Check out our [Contributing guide](/.github/CONTRIBUTING.md)

## Copyright

[LibSass]: https://github.com/sass/libsass

Copyright (c) 2013-2016 Andrew Nesbitt Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.