LibSass

LibSass is a C/C++ implementation of the Sass stylesheet language, designed to be embedded into other programs as a fast, portable compiler. It provides both a command-line interface and a C API, allowing developers to integrate Sass/SCSS compilation into build tools and applications.

LibSass implements the core Sass features, including variables, nesting, mixins, functions, and control directives, and supports both the SCSS and indented Sass syntaxes. It focuses on performance and portability and is commonly used by bindings for other languages and by toolchains that compile Sass during the build process.

Usage and ecosystem: The library is used through language bindings (for example, Node.js bindings such as node-sass) or embedded directly in applications. It compiles Sass input into CSS, handling imports, modules, and output style options.

Status and history: LibSass was the main C/C++ implementation of Sass for embedding in non-Ruby environments. Development slowed and the project was deprecated in favor of Dart Sass, which is the reference implementation written in Dart. The LibSass repository has been archived and users are advised to migrate to Dart Sass for new projects.

The recommended alternative for new projects is Dart Sass. It provides the official, actively maintained implementation of Sass and is the preferred choice for modern tooling and workflows.