Citizen17.DartSass 2.4.0

dotnet add package Citizen17.DartSass --version 2.4.0
NuGet\Install-Package Citizen17.DartSass -Version 2.4.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Citizen17.DartSass" Version="2.4.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Citizen17.DartSass --version 2.4.0
#r "nuget: Citizen17.DartSass, 2.4.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Citizen17.DartSass as a Cake Addin
#addin nuget:?package=Citizen17.DartSass&version=2.4.0

// Install Citizen17.DartSass as a Cake Tool
#tool nuget:?package=Citizen17.DartSass&version=2.4.0


Library for compiling SASS using Dart Sass runtime.


Install package using NuGet.


By default package doesn't contain Dart Sass runtime. It can use installed in system Dart Sass or you can one of packages with runtime:

  • DartSass.Native.linux-x64
  • DartSass.Native.linux-arm64
  • DartSass.Native.linux-arm
  • DartSass.Native.linux-x86
  • DartSass.Native.linux-musl-x64
  • DartSass.Native.linux-musl-arm64
  • DartSass.Native.linux-musl-arm
  • DartSass.Native.linux-musl-x86
  • DartSass.Native.macos-x64
  • DartSass.Native.macos-arm64

Note: My library cannot detect is android device or linux musl. You must provide value with concrete type. Example:

var compiler = new DartSassCompiller(DartSassNativeType.AndroidX64);


Create DartSassCompiller instance.

using Citizen17.DartSass;

var compiler = new DartSassCompiller();

When instance creates it try find Dart Sass runtime. First it search in project. If not found it try search in system using environmen variable PATH.

If you have dedicated Dart Sass runtime you can pass it as parameter to constructor.

var compiler = new DartSassCompiller("/path/to/sass/executable");

Also you can path DartSassNativeType enum value to specify which Dart Sass from Nuget to use.

var compiler = new DartSassCompiller(DartSassNativeType.AndroidX64);


You can set default options that will be used on every compile.

compiler.CompileOptions = new SassCompileOptions
    StyleType = StyleType.Expanded,
    EmitCharset = true,
    Update = false,
    ImportPaths = [
    GenerateSourceMap = true,
    SourceMapUrlType = SourceMapUrlType.Relative,
    EmbedSources = false,
    EmbedSourceMap = false,
    Quiet = false,
    QuietDeps = false,
    Indented = false,
    PkgImporter = SassPkgImporterType.Node,
    ErrorCSS = false,
    FatalDeprecation = [
    FutureDeprecation = [
    SilenceDeprecation = [
    StopOnError = true

Also every compile method can accept options. If options passed they override defaults.

Compile from file

Use CompileAsync method to get compiled code from file source.

SassCodeCompilationResult result = await compiler.CompileAsync("/path/to/source.scss");
string code = result.Code;

Compile from code

Use CompileCodeAsync method to get compiled code from string source.

var sourceSassCode = ".some-class { color: red; }";
SassCodeCompilationResult result = await compiler.CompileCodeAsync(sourceSassCode);
string code = result.Code;

Compile from file to file

Use CompileToFileAsync method to compile source SASS file to CSS.

SassFilesCompilationResult result = await compiler.CompileToFileAsync("/path/to/source/source.scss");
IEnumerable<string> files = result.Files;

Result file: /path/to/source/source.css and /path/to/source/ if Source maps enabled.

Also you can pass custom name for output file.

SassFilesCompilationResult result = await compiler.CompileToFileAsync("/path/to/source/source.scss", "dest.css");
IEnumerable<string> files = result.Files;

Result file: /path/to/source/dest.css and /path/to/source/ if Source maps enabled.

SassFilesCompilationResult result = await compiler.CompileToFileAsync("/path/to/source/source.scss", "/path/to/dest/dest.css");
IEnumerable<string> files = result.Files;

Result file: /path/to/dest/dest.css and /path/to/dest/ if Source maps enabled.

Compile multiple files

Use CompileToFilesAsync method to compile multiple files. It has 2 overload.

First accept list of strings with source files.

var sourceFiles = new string[]

SassFilesCompilationResult result = await compiler.CompileToFilesAsync(sourceFiles);
IEnumerable<string> files = result.Files;

All output files will be placed near it source file. Or you can pass additional parameter to specify output directory.

SassFilesCompilationResult result = await compiler.CompileToFilesAsync(sourceFiles, "/path/to/dest");
IEnumerable<string> files = result.Files;

Second accept dictionary where key is source file and value is output file.

var sourceFiles = new Dictionaty<string, string>
    { "path/to/source.sass", "dest.css" }, // Will be placed near source file
    { "path/to/source2.sass", "path/to/dest2.css" },
    { "path/to/source3.sass", null } // Will be generated source3.css file and placed near source file
    { "path/to/source4.sass", "path/to/dest/" } // Will be generated source4.css file and placed in path/to/dest/

SassFilesCompilationResult result = await compiler.CompileToFilesAsync(sourceFiles);
IEnumerable<string> files = result.Files;

Also you can pass as second parameter output directory and all files without reletive or ablsolute path will be placed in that directory


If output contains some Warnings, Deprecation Warnings or Debug messages they are will be presented in result.

SassCodeCompilationResult result = await compiler.CompileAsync("/path/to/source.scss");
string code = result.Code;

// Warnings
IEnumerable<SassMessage> warnings = result.Warnings;

foreach (var warning in warnings) {
    string message = warning.Message;
    string stackTrace = warning.StackTrace;
    string rawMessage = warning.RawMessage;

// Deprecation warnings
IEnumerable<SassDeprecationWarning> deprecationWarnings = result.DeprecationWarnings;

foreach (var deprecationWarning in deprecationWarnings) {
    string message = deprecationWarning.Message;
    // Recomendation from Sass
    string recomendation = deprecationWarning.Recommendation;
    string stackTrace = deprecationWarning.StackTrace;
    string rawMessage = deprecationWarning.RawMessage;

// Debug
IEnumerable<SassMessage> debugMessages = result.Debug;

foreach (var debugMessage in debugMessages) {
    string message = debugMessage.Message;
    string stackTrace = debugMessage.StackTrace;
    string rawMessage = debugMessage.RawMessage;


If compilation fails with errors it throws SassCompileException. It contains next properties:

  • string RawOutput
  • IEnumerable<SassMessage> Errors
  • IEnumerable<SassMessage> Warnings
  • IEnumerable<SassDeprecationWarning> DeprecationWarnings
  • IEnumerable<SassMessage> Debug


Also you can get version of used Dart Sass runtime.

var version = await compiler.GetVersionAsync();
Product Compatible and additional computed target framework versions.
.NET net5.0 is compatible.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • net5.0

    • No dependencies.
  • net6.0

    • No dependencies.
  • net8.0

    • No dependencies.

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Version Downloads Last updated
2.4.0 338 5/2/2024
2.3.0 323 2/29/2024
2.2.0 103 1/31/2024
2.1.0 1,530 8/31/2022
2.0.0 363 8/3/2022
1.1.0 399 6/9/2022
1.0.0 386 12/1/2021

v 1.1.0:
* Added support of Linux Arm64 and MacOS arm64
* Added support of -q flag

v 2.0.0:
* Fixed problem with incorrect output when compiling to code
* Changed result of all methods. See Readme
* Added parsing warnings, deprecation warnings, debug messages
* Fixed parsing errors

v 2.1.0
* Added support for 32-bit ARM Linux package

v 2.2.0
* Now Dart Sass compiler searches in directories relative to execution assembly
* Added .NET 8 target

v 2.3.0
* Added support next options of Dart Sass: Indended, ErrorCSS, PkgImporter, FatalDeprecation, StopOnError
* Added new constructor with enum parameter for choosing Dart Sass runtime from Nuget

v 2.4.0
* Added support newxt options of Dart Sass: FutureDeprecation, SilenceDeprecation
* Added new deprecation CssFunctionMixing and future deprecation Import