1.1.0 • Public • Published


Gulp plugin to compile Sass (.scss) to CSS using the Dart Sass compiler.

Made to work with latest version of the JavaScript based compiler.


npm i gulp-dart-scss


const gulp = require("gulp");
const scss = require("gulp-dart-scss");
export function compileScss() {
  return gulp
        // Optional option object - See below or sass for API


From node-sass


  • Type: String
  • Default: null

Special: file or data must be specified

Path to a file for [LibSass] to compile.


  • 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


  • 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)


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


  • 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()


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


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


  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(- f + 1);
      for (= f; i <= t; i++) {
        list.setValue(- 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.

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.


  • 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.

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

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


  • 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 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.


  • 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.


  • 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


npm i gulp-dart-scss

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