Thank you for showing an interest in contributing.
This project is an early proof of concept of a language server for Sass written in Dart to make use of sass_api.
Note that the Sass parser currently requires a valid document to generate an AST (sass/dart-sass#2476), making it impossible to implement certain features such as completions/IntelliSense.
You are still welcome to test and contribute where you can. Check the documentation and list of open issues to get started: