sass/dart-sass

This system is a comprehensive Sass compiler implementation written in Dart, providing both a command-line interface and programmatic APIs for compiling SCSS and Sass stylesheets into CSS. It features a modular architecture that supports asynchronous compilation, parallel processing, and cross-platform execution via Dart isolates and JavaScript interop. The engine includes a detailed Abstract Syntax Tree for parsing and evaluating Sass features like modules, functions, and color spaces, while also exposing a PostCSS-compatible parser for external tooling.

This period focused on modernizing the Sass compiler's architecture by introducing a comprehensive public Dart API and asynchronous compilation support. The internal codebase was significantly restructured, particularly the Abstract Syntax Tree (AST) and parser, to better separate CSS and Sass constructs and support complex selector and expression handling.

23 changes

This period focused on modernizing the Sass engine with an asynchronous importer interface and a new module system for built-in functions. Parallel compilation via Dart isolates and mutable CSS AST nodes were introduced to improve performance and evaluation efficiency. Comprehensive test suites were added to validate the new asynchronous workflows, CLI behaviors, and functional modules.

13 changes

This period focused on expanding the project's integration capabilities through a new embedded compiler for cross-process communication and a comprehensive JavaScript API. The team also modernized internal value handling with specialized number subclasses and implemented CSS Color Level 4 support, while introducing a PostCSS-compatible parser for broader ecosystem compatibility.

15 changes

sass/dart-sass was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.