dart-sass

name: dart-sass description: "Provides comprehensive guidance for Dart Sass including Sass syntax, compilation, mixins, functions, and best practices. Use when the user asks about Dart Sass, needs to compile Sass to CSS, use Sass features, or work with Sass in projects." license: Complete terms in LICENSE.txt

When to use this skill

Use this skill whenever the user wants to:

• Install and configure Dart Sass
• Compile Sass/SCSS files to CSS
• Use Sass syntax features (variables, nesting, mixins, functions, etc.)
• Work with Sass modules and imports
• Integrate Sass into build tools or workflows
• Use Sass CLI commands
• Configure Sass compilation options
• Use Sass in JavaScript or Dart projects
• Optimize Sass compilation performance
• Handle Sass source maps

How to use this skill

To use Dart Sass:

1. Install Dart Sass:

   • Load examples/getting-started/installation.md for installation instructions
   • Load examples/getting-started/basic-usage.md for basic usage examples
   • Load examples/getting-started/compiling-modes.md for different compilation modes

2. Learn Sass syntax:

   • Load examples/syntax/variables.md for variable usage
   • Load examples/syntax/nesting.md for nesting syntax
   • Load examples/syntax/mixins.md for mixins
   • Load examples/syntax/functions.md for functions
   • Load examples/syntax/operators.md for operators
   • Load examples/syntax/at-rules.md for at-rules

3. Use advanced features:

   • Load examples/features/modules.md for module system
   • Load examples/features/imports.md for imports
   • Load examples/features/control-flow.md for control flow
   • Load examples/features/built-in-modules.md for built-in modules
   • Load examples/features/source-maps.md for source maps
   • Load examples/features/custom-functions.md for custom functions

4. Reference the API documentation when needed:

   • api/js-api.md - JavaScript API reference
   • api/dart-api.md - Dart API reference
   • api/cli-api.md - CLI command reference

5. Use templates for quick start:

   • templates/basic-project.md - Basic Sass project template
   • templates/modular-project.md - Modular Sass project template
   • templates/build-integration.md - Build tool integration template

Doc mapping (one-to-one with official documentation)

• examples/ → https://sass-lang.com/documentation/

Examples and Templates

This skill includes detailed examples organized to match the official documentation structure. All examples are in the examples/ directory (see mapping above).

To use examples:

• Identify the topic from the user's request
• Load the appropriate example file from the mapping above
• Follow the instructions, syntax, and best practices in that file
• Adapt the code examples to your specific use case

To use templates:

• Reference templates in templates/ directory for common scaffolding
• Adapt templates to your specific needs and coding style

Inline Quick Start

# Install
npm install --save-dev sass

# Compile once
npx sass src/styles.scss dist/styles.css

# Watch for changes
npx sass --watch src/styles.scss:dist/styles.css

# Production (compressed)
npx sass src/styles.scss dist/styles.css --style=compressed --no-source-map

// src/styles.scss — using @use module system
@use 'sass:math';
@use './variables' as vars;

.container {
  max-width: vars.$max-width;
  padding: math.div(vars.$spacing, 2);
}

@mixin responsive($breakpoint) {
  @media (min-width: $breakpoint) { @content; }
}

.hero {
  font-size: 1.5rem;
  @include responsive(768px) {
    font-size: 2rem;
  }
}

API Reference

• JavaScript API: api/js-api.md - JavaScript API for compiling Sass (compile, compileString, etc.)
• Dart API: api/dart-api.md - Dart API for compiling Sass
• CLI API: api/cli-api.md - Command-line interface options and usage

Best Practices

1. Use @use instead of @import: The @import rule is deprecated, use @use and @forward instead
2. Organize with modules: Use the module system to organize and share code
3. Optimize compilation: Use appropriate output style (compressed for production)
4. Source maps: Enable source maps for development, disable for production
5. Watch mode: Use --watch for development to automatically recompile on changes
6. Load paths: Use --load-path to simplify import paths
7. Performance: Use Dart Sass for best performance (faster than Ruby Sass)
8. Version control: Don't commit compiled CSS files, only commit Sass source files

Troubleshooting

• @import deprecation warning: Replace @import with @use and @forward; update variable references to use namespaces
• Compilation errors: Check for missing semicolons, unmatched braces, or invalid nesting
• Missing module: Verify @use path is correct relative to the file; use --load-path for shared directories
• Slow compilation: Use --watch during development; consider splitting large files into partials

Resources

• Official Website: https://sass-lang.com/dart-sass/
• Installation Guide: https://sass-lang.com/install/
• Documentation: https://sass-lang.com/documentation/
• GitHub Repository: https://github.com/sass/dart-sass
• npm Package: https://www.npmjs.com/package/sass
• pub.dev Package: https://pub.dev/packages/sass

Keywords

dart-sass, sass, scss, css preprocessor, sass compiler, sass syntax, sass modules, sass mixins, sass functions, sass variables, sass nesting, @use, @forward, @import, @include, @mixin, @function, sass:math, sass:color, sass:string, source maps, sass cli, sass api, 样式预处理器, Sass 编译器, Sass 语法, Sass 模块, Sass 混合, Sass 函数