The parser is written in Rust using pulldown-cmark for Markdown. It ships as a prebuilt binary via npm so no Rust toolchain is needed.
npm: https://www.npmjs.com/package/@tosiiko/mdl/v/0.1.2
VS Code: https://marketplace.visualstudio.com/items?itemName=MDLLanguageSupport.mdl-language
GitHub: https://github.com/tosiiko/mdl-code